U.S. patent application number 09/990043 was filed with the patent office on 2003-05-22 for asphalt composition ridge cover with improved ridge bend.
Invention is credited to Freiborg, Bennie, Freiborg, Mark L..
Application Number | 20030093958 09/990043 |
Document ID | / |
Family ID | 25535697 |
Filed Date | 2003-05-22 |
United States Patent
Application |
20030093958 |
Kind Code |
A1 |
Freiborg, Mark L. ; et
al. |
May 22, 2003 |
Asphalt composition ridge cover with improved ridge bend
Abstract
Asphalt composition ridge cover formed from an approximately
rectangular sheet of asphalt composition roofing material. The
sheet of asphalt composition material is bent around a radius along
a longitudinal centerline. The roofing material may be bent by
pressing the roofing material into a resilient pad with a tool
having the radius. The roofing material may include an accordion
folded section to support an overlapping ridge cover. The accordion
folded section may include a relief for the bend around a
radius.
Inventors: |
Freiborg, Mark L.;
(Huntington Beach, CA) ; Freiborg, Bennie;
(Flintridge, CA) |
Correspondence
Address: |
BLAKELY SOKOLOFF TAYLOR & ZAFMAN
12400 WILSHIRE BOULEVARD, SEVENTH FLOOR
LOS ANGELES
CA
90025
US
|
Family ID: |
25535697 |
Appl. No.: |
09/990043 |
Filed: |
November 19, 2001 |
Current U.S.
Class: |
52/73 |
Current CPC
Class: |
E04D 1/29 20190801; E04D
1/30 20130101; E04D 2001/005 20130101; E04D 2001/305 20130101 |
Class at
Publication: |
52/73 |
International
Class: |
E04B 001/34; E04B
007/16 |
Claims
What is claimed is:
1. A ridge cover comprising a generally rectangular sheet of
roofing material having an upper surface, an opposing lower
surface, a first end, an opposing second end, a first edge, and an
opposing second edge, the sheet of roofing material having a
longitudinal centerline from a midpoint of the first end to a
midpoint of the second end, the sheet of roofing material being
bent around a radius along the longitudinal centerline such that
the lower surfaces at the first and second edges are brought toward
each other.
2. The ridge cover according to claim 1, further comprising a first
strip of adhesive substantially parallel and adjacent to the first
end between the longitudinal centerline and the first edge, and a
second strip of adhesive substantially parallel and adjacent to the
first end between the longitudinal centerline and the second edge,
wherein the first strip of adhesive is closer to the first end than
the second strip of adhesive.
3. The ridge cover according to claim 1, wherein the roofing
material is folded an even number of times about axes perpendicular
to the longitudinal centerline to cause multiple layers of the
sheet of roofing material to form an accordion folded section
between the first and second ends, each layer of the roofing
material above a bottom layer in the accordion folded section being
cut along the longitudinal centerline so that the roofing material
can separate at the longitudinal centerline to facilitate the
bending around a radius.
4. The ridge cover according to claim 3, wherein a top layer in the
accordion folded section is cut perpendicular to the longitudinal
centerline substantially coincident to an edge of the accordion
folded section furthest from a folded edge of the top layer to
facilitate the bending around a radius.
5. The ridge cover according to claim 4, wherein the bottom layer
in the accordion folded section is cut perpendicular to the
longitudinal centerline substantially coincident to a folded edge
of the bottom layer to facilitate the bending around a radius.
6. The ridge cover according to claim 5, wherein a layer above the
bottom layer in the accordion folded section is cut out in an area
adjacent the longitudinal centerline to provide a relief for the
bend around a radius.
7. The ridge cover according to claim 3, further comprising a first
strip of adhesive substantially parallel and adjacent to the first
end between the longitudinal centerline and the first edge, and a
second strip of adhesive substantially parallel and adjacent to the
first end between the longitudinal centerline and the second edge,
wherein the first strip of adhesive is closer to the first end than
the second strip of adhesive.
8. The ridge cover according to claim 1, wherein the roofing
material is bent around a radius by pressing the roofing material
into a resilient pad with a tool having the radius.
9. The ridge cover according to claim 1, wherein the roofing
material is folded four times about axes perpendicular to the
longitudinal centerline to form an accordion folded section between
the first and second ends, the accordion folded section having: a
bottom layer contiguous with the roofing material that extends to
the first end; a first folded layer adjacent to the bottom layer,
the first folded layer defining a generally rectangular first
aperture having a width that extends to both sides of the
longitudinal centerline and a length that extends between two fold
lines that define the first folded layer; a second folded layer
adjacent to the first folded layer, the second folded layer
defining a generally rectangular second aperture having a width
that extends to both sides of the longitudinal centerline and a
length that extends between two fold lines that define the second
folded layer, the second width being less than the first width; a
third folded layer adjacent to the second folded layer, the third
folded layer being slit along the longitudinal centerline; and a
top layer adjacent to the fourth folded layer and contiguous with
the roofing material that extends to the second end, the top layer
being slit along a line coincident with a folded edge of the
accordion folded section closest to the second end with a length
that extends to both sides of the longitudinal centerline and along
the longitudinal centerline to the line coincident with the folded
edge.
10. A ridge cover comprising a generally rectangular sheet of
roofing material having an upper surface, an opposing lower
surface, a first end, an opposing second end, a first edge, and an
opposing second edge, the sheet of roofing material having a
longitudinal centerline from a midpoint of the first end to a
midpoint of the second end, the sheet of roofing material including
a thickening means midway between the first and second ends for
supporting a first end of an overlapping ridge cover, the sheet of
roofing material being bent around a radius along the longitudinal
centerline such that the lower surfaces at the first and second
edges are brought toward each other.
11. The ridge cover according to claim 10, further comprising a
first adhesive means substantially parallel and adjacent to the
first end between the longitudinal centerline and the first edge
for adhering the first end to roofing material below the ridge
cover, and a second adhesive means substantially parallel and
adjacent to the first end between the longitudinal centerline and
the second edge and spaced apart from the first adhesive means for
adhering the first end to roofing material below the ridge cover
without adhering to the first adhesive means.
12. The ridge cover according to claim 10, wherein the thickening
means is configured for facilitating the bending around a
radius.
13. The ridge cover according to claim 12, wherein the thickening
means includes a relief means for relieving the bend around a
radius.
14. The ridge cover according to claim 13, further comprising a
first adhesive means substantially parallel and adjacent to the
first end between the longitudinal centerline and the first edge
for adhering the first end to roofing material below the ridge
cover, and a second adhesive means substantially parallel and
adjacent to the first end between the longitudinal centerline and
the second edge and spaced apart from the first adhesive means for
adhering the first end to roofing material below the ridge cover
without adhering to the first adhesive means.
15. A method of fabricating a ridge cover comprising: providing a
generally rectangular sheet of roofing material having a first end,
an opposing second end, a first edge, and an opposing second edge,
the sheet of roofing material having a longitudinal centerline from
a midpoint of the first end to a midpoint of the second end; and
bending the sheet of roofing material around a radius along the
longitudinal centerline such that the lower surfaces at the first
and second edges are brought toward each other.
16. The method according to claim 15, wherein bending further
comprises pressing the roofing material into a resilient pad with a
tool having the radius.
17. The method according to claim 15, further comprising heating
the sheet of roofing material prior to bending such that the
bending occurs while the sheet of roofing material is at least
150.degree. F.
18. The method according to claim 15, further comprising heating
the sheet of roofing material prior to bending such that the
bending occurs while the sheet of roofing material is between
180.degree. F. and 220.degree. F.
19. The method according to claim 18, wherein bending further
comprises pressing the roofing material into a resilient pad with a
tool having the radius.
20. The method according to claim 15, further comprising: folding
the sheet of roofing material an even number of times about axes
perpendicular to the longitudinal centerline to cause multiple
layers of the sheet of roofing material to form an accordion folded
section between the first and second ends; cutting the sheet of
roofing material along and adjacent to the longitudinal center to
provide a relief means in the accordion folded section for
relieving the bend around a radius.
Description
FIELD OF THE INVENTION
[0001] This invention relates to the field of roofing, and more
particularly to preformed asphalt composition roof ridge, hip, and
rake covers.
BACKGROUND OF THE INVENTION
[0002] In building construction, the roof is a vital element for
protecting the structure, particularly against the intrusion of
moisture such as rain water. Many different forms of roofing are
known with various advantages and disadvantages. Asphalt
composition shingle roofs are a widely used form of roofing. An
asphalt composition roof made up of individual shingles is a
relatively durable, light-weight and inexpensive roof. Such a roof
may have a weight of approximately 235 pounds per hundred square
feet and is fairly easily and quickly installed. The asphalt is not
easily ignited and fire resulting from hot ashes falling on the
roof is further inhibited by the granular surface on such
roofs.
[0003] As may be seen in FIG. 1, a shingle roof is typically made
up of a number of sloping roofing planes that intersect along ridge
lines 20 and hip lines 22. Sloping edges of the roofing planes that
do not intersect another roofing plane or other surface form rake
lines 23. The free hanging unsloped lower edge of a roofing plane
forms an eve line (not shown). It is important that the ridge lines
20 and hip lines 22, which occur at the intersection of the upper
portions of two intersecting roofing planes be covered by a durable
roofing component that protects these edges and prevents the
intrusion of moisture. This is typically accomplished by covering
the ridge lines 20 and hip lines 22 with ridge covers 24. A ridge
cover is basically a special shingle that includes a bend along a
ridge line of the ridge cover to provide two surfaces seamlessly
joined along the ridge line. The two surfaces of the ridge cover
are disposed at substantially the same angle as the two
intersecting roofing planes to be covered by the ridge cover. Thus
a ridge line 20 or hip line 22 can be covered in a way that
eliminates open seams along the upper edges of the roofing planes
that would otherwise allow moisture to run under the shingles
covering the roofing plane. Ridge covers may also be used to cover
the exposed edges of the shingles along rake lines 23 or eve lines.
Covering rake lines 23 or eve lines is typically done primarily for
aesthetic reasons. It will be appreciated that ridge covers that
include the present invention may be used to cover ridge lines 20,
hip lines 22, rake lines 23, eve lines, and for any other
application of asphalt composition roofing material that includes a
bend similar to the ridge line bend of a ridge cover.
[0004] Various types of asphalt composition ridge covers are known
in the prior art. See for example U.S. Pat. No. 3,913,294 to
Freiborg. A persistent concern for ridge covers is the durability
of the ridge cover, particularly along the ridge bend. The ridge
cover is installed on portions of the roof that are most exposed
and vulnerable to deterioration due to weathering. The ridge bend
is, in turn, at the most vulnerable area of the ridge cover.
Further, any breach in the integrity of the sealing provided by the
ridge covers can allow moisture to get below the roof covering
causing further deterioration of the roofing system as a whole.
[0005] Asphalt composition material is prone to cracking when bent
or folded. This is of particular concern with respect to the ridge
bend of a ridge cover because creating a ridge bend, particular
when done in the field during installation of the roofing system,
can compromise the asphalt composition material in the area of the
ridge bend, one of the most vulnerable points of the roofing
system. Various techniques have been used to create a ridge cover
that is more durable and less susceptible to cracking along the
ridge line. See for example U.S. Patent RE36,858 for a ridge cover
made from an asphaltic material modified to improve its
flexibility. It is desirable to provide asphalt composition ridge
covers that are less susceptible to cracking along the ridge
line.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a drawing of a portion of a building roof
illustrating the appearance of the ridge cover of the present
invention.
[0007] FIG. 2 shows a rectangle of asphalt composition
material.
[0008] FIG. 3 shows a ridge cover including the present invention
with a typical configuration for installation.
[0009] FIG. 4 shows a ridge cover including the present invention
with a typical configuration for packaging.
[0010] FIG. 5 is a cross section of a ridge cover during impact
forming of a ridge bend.
[0011] FIG. 6 is a cross section taken along line 6--6 of FIG. 1
showing a ridge cover that uses accordion folding to provide an
aesthetic appearance.
[0012] FIG. 7 shows the configuration of an unfolded ridge cover
that uses accordion folding and the present invention.
[0013] FIG. 8 shows the accordion folds in the ridge cover of FIG.
8 in plan view.
[0014] FIG. 9 shows a perspective view of the ridge cover of FIG. 8
fully formed including a ridge bend according to the present
invention.
[0015] FIG. 10 shows the configuration of another unfolded ridge
cover that uses accordion folding and the present invention.
[0016] FIG. 11 shows a perspective view of the ridge cover of FIG.
10 fully formed including a ridge bend according to the present
invention.
[0017] FIGS. 12A and 12B are a cross section taken along line
12--12 of FIG. 11.
[0018] FIG. 13 shows the configuration of another unfolded ridge
cover that uses accordion folding and the present invention.
[0019] FIG. 14 shows a perspective view of the ridge cover of FIG.
13 fully formed including a ridge bend according to the present
invention.
[0020] FIGS. 15A and 15B are a cross section taken along line
15--15 of FIG. 13.
DETAILED DESCRIPTION OF THE INVENTION
[0021] First referring to FIG. 1, an illustration of a ridge cover
24, as installed on a typical roof, may be seen. It is to be
understood that the phrase "ridge cover", as used herein, is used
in the broad sense to include hip covers, rake pieces, and the
like, and is used merely as a convenient phrase for identifying all
such covers. Asphalt composition ridge covers may be applied along
a ridge line 20, a hip line 22, a rake line 23, eve line, or
generally at any intersection of two roof planes or edge of a roof
plane, and for any other application of asphalt composition roofing
material that includes a bend similar to the ridge line bend of a
ridge cover.
[0022] In its simplest form, a ridge cover for an asphalt
composition roof can be an approximately rectangular sheet of
roofing material bent along its centerline to substantially the
same angle as the angle formed by the roofing surfaces where they
meet at the ridge line of the roof.
[0023] In the description and in the claims, the phrase
"approximately rectangular" is used to distinguish from round,
oval, triangular or other shapes departing substantially from a
rectangular shape, and includes among other shapes, truly
rectangular shapes, four sided shapes wherein two opposite sides
are parallel and the other two sides are somewhat non parallel so
as to define a member having a somewhat tapered width (see FIG. 2
for example), and stepped and notched shapes that introduce various
cutouts into a generally rectangular shape. It will be appreciated
that the particular overall shape of the ridge cover is not
significant to the present invention. The term "substantially" is
used in the description and in the claims to indicate a limitation
that is met with a tolerance that is consistent with the normal
variations found in producing the limiting conditions by normal
commercial means.
[0024] Asphalt composition roofing material is characterized by a
mat or roving of fibrous material typically saturated with asphalt,
and having a layer of asphalt bonding inorganic granules to the top
surface of the roofing material. The mat may be an organic mat, or
an inorganic mat such as a fiberglass mat, and the asphalt may have
or include a modifier, locally or throughout, to make the material
more flexible, particularly in cold weather, though one of the
features of the present invention is the minimization of the need
for a flexiblizer. Generally the selection of the mat material, the
granule color, etc. will be coordinated with the same parameters
for the shingles on the roof for overall physical and visual
compatibility. It will be appreciated that the specific type of
asphalt composition material is not significant to the present
invention.
[0025] It will be appreciated that when any material is bent, the
outer surface of the bend is placed in tension and the inner
surface is compressed. It will also be appreciated that asphalt
composition roofing material is a complex elastomeric material with
non-uniform properties and behavior that is not accurately
described with reference to models based on ideal materials.
Nonetheless, it is known that asphalt composition roofing material
is susceptible to cracking along lines where it has been bent.
Cracking may occur during the bending operation or later when the
material ages or is exposed to adverse conditions. Asphalt
composition roofing material becomes brittle when cold and it can
be virtually impossible to bend without material failure at
temperatures that can be encountered when installing a roof,
particularly if the ambient temperatures is below 50.degree. F.
While asphalt composition ridge covers can be made at the time of
roofing installation either from specially cut material that is
folded by the installer or from field shingle material that is cut
and folded by the installer, bending and folding at the time of
installation produces ridge covers that are highly susceptible to
cracking along the folds and bends.
[0026] The present invention provides asphalt composition ridge
covers that are less susceptible to cracking along the folds and
bends by providing a ridge cover that is preformed. Preforming is
carried out under conditions that reduce the stresses on the
asphalt composition material. The forming operations may be carried
out at elevated temperatures that allow the asphalt composition
material to be bent or folded more easily. Preferably the bending
and folding are done at above 150.degree. F. and more preferably
between 180.degree. F. and 220.degree. F. These operations may be
carried out with tooling that allows the forming to be performed
more consistently and without introducing stress concentrations
that can lead to localized cracking or other damage to the asphalt
composition material.
[0027] The bend that forms the ridge line is the most important
bend in terms of overall durability of the ridge cover as a part of
the roofing system. It has been discovered that making the ridge
bend around a radius provides a ridge cover that is less
susceptible to cracking along the ridge line. It has been found
that a ridge cover manufactured with a preformed bend according to
the invention exhibits improved durability along the ridge line as
compared to other ridge covers, and particularly as compared to
ridge covers that are bent or folded at the time of installation.
The inventive ridge cover makes the ridge line bend around a radius
to produce less tension on the outer surface of the bend.
Preferably the bending is done at elevated temperatures to improve
the elasticity of the material during bending. Preferably the
bending along the ridge line is done by an impact forming method
described below to improve the characteristics of the material in
the bent region.
[0028] In the description herein and as used in the claims, the
phrase "bent around a radius" is used to mean a bend that is formed
such that the inner surface of the bent material has a substantial
radius as compared to the thickness of the material such that the
tension introduced in the outside surface of the bent material is
substantially less than it would be if the material were bent over
a sharp edge. Asphalt composition roofing material typically has a
thickness of about one-eighth to three-sixteenths of an inch. A
bending radius of one-eighth inch has been found to be satisfactory
for bending ridge covers made from a single thickness of roofing
material. Larger radii can be used but the radius may be limited by
other concerns such as the overall folding geometry of the ridge
cover or packaging considerations.
[0029] FIG. 2 shows an asphalt composition ridge cover 24 before
bending. The generally rectangular sheet of asphalt composition
material has a forward first end 30 that is wider than an opposing
rear second end 32 so that the forward first end of each successive
ridge cover will fully cover the rear second end of the preceding
ridge cover during installation. The two side edges 34 of the ridge
cover taper from front to rear. In another embodiment, the steps
may have a notch or step to reduce the width of the ridge cover at
the rear portion and to provide a reference to set the overlap of
ridge covers during installation. The outline form of the ridge
cover is not significant to the present invention.
[0030] A ridge bend is formed in the ridge cover 24 in the area
indicated by the dashed lines 36. The ridge bend is generally
formed along a line connecting the midpoint of the front end 30 to
the midpoint of the rear end 32. The ridge bend 36 is formed around
a radius as may be seen in the end view of the ridge cover 24 in
FIG. 4. Preferably the ridge bend 36 is formed through nearly
180.degree. such that the two sides 34 are substantially parallel
as shown in FIG. 5. Bending the ridge cover so that the two sides
meet or nearly meet is generally advantageous for packaging. It
also ensures that the ridge covers will always be opened rather
than folded for installation.
[0031] While the inventive ridge bend may be made by any technique
that produces a bend around a radius, it has been found that the
ridge line bend may be advantageously formed by an impact forming
method. A cross section of the ridge cover 24 is shown during
impact forming in FIG. 5. The outer surface 38 of the unbent ridge
cover, which is typically coated with granules such as crushed
rock, is supported on a resilient surface 40, such as a soft rubber
block. A tool 42 having the bending radius is pressed into the
ridge cover 24 to bend the ridge cover along the ridge line 36.
Preferably the rubber block 40 is a soft solid rubber about one
inch thick. The tool 42 may be a steel bar about one-quarter inch
thick with a rounded edge as shown or a round steel bar about
one-quarter inch in diameter. Preferably the tool is pressed into
the ridge cover 24 about one-fourth of an inch after the tool makes
contact with the inside surface 39 of the ridge cover 24. It is
believed that this impact forming method of bending may be
advantageous because the resilient surface 40 supports the outer
granule covered surface 38 in the ridge bend region 36 and presses
the granules into the outer surface during bending. This may
improve the bonding of the granules to the asphalt composition
material, particularly if the material is warm during the impact
forming process, and thus provide a more durable material along the
ridge line 36. It is also believed that the impact forming may
support both surfaces 38, 39 of the ridge cover 24 in the ridge
bend region 36 as it is bent to provide more uniform material
properties of the bent region 36 after bending and thereby reducing
discontinuities that cause stress concentrations that could develop
into cracks and failures. It is also believed that the impact
forming may provide a calendering effect wherein the fibers of mat
material are compressed in the ridge bend region 36 to provide a
thinner, more dense material that is more durable and more easily
bent.
[0032] It will be appreciated that preforming ridge covers prior to
installation allows the ridge covers to be formed from asphalt
composition material that is warmed. Warming softens the asphalt
material that impregnates the fibrous material and improves the
pliability of the asphalt composition for subsequent bending and
folding operations. The temperature of the asphalt composition
material is typically elevated to above 150.degree. F., preferably
to between 180.degree. F. and 220.degree. F., for the bending and
folding operations. It will be appreciated that heating the asphalt
composition material to these temperatures and handling the heated
material for bending and folding at the time of installation would
be difficult. Thus there is a significant advantage to
manufacturing and shipping a preformed asphalt composition ridge
cover.
[0033] The preformed ridge covers are preferably packaged and
delivered folded so that the ridge cover is opened rather than
folded during later installation. When the ridge cover is opened,
the outer surface of the bend is compressed rather than stretched.
Thus the field installation operation needed to prepare the ridge
cover for installation is less stressful to the critical ridge bend
region. This reduces the likelihood that the ridge bend region will
be compromised even if the field operation is carried out under
less than ideal conditions, such as being performed in cold
weather.
[0034] A simple ridge cover of the type described above provides a
satisfactory sealing of ridge lines and the use of a ridge bend
according to the present invention provides a durable seal.
However, asphalt composition material is relatively thin and
asphalt composition shingle roofs tend to have a flat
non-dimensional appearance. U.S. Pat. No. 3,913,294 to Freiborg
discloses an asphalt composition ridge cover that uses additional
folding to provide a ridge cover with a more dimensional appearance
for the purpose of improving the aesthetic appearance of the
roofing system. FIG. 6 shows a cross-section of ridge covers 124 of
the type disclosed in U.S. Pat. No. 3,913,294 ('294 type ridge
covers) taken along line 6--6 of FIG. 1. Considering two adjacent
ridge covers where a first ridge cover 124a is partially covered by
a succeeding ridge cover 124b, the preceding ridge cover 124a
includes an accordion fold section 140a that supports the forward
end 130b of the succeeding ridge cover 124b. This creates the
appearance of ridge covers 124 with a substantial thickness.
[0035] The use of a ridge bend around a radius can be applied to
'294 type ridge covers to improve the durability of the ridge
covers in the area of the ridge bend 136. FIG. 7 shows a plan view
of a '294 type ridge cover before folding. The ridge cover is
accordion folded along the indicated broken lines 148, 150, 152,
154 to create the thickened accordion folded section 140 as shown
in FIG. 8. The ridge cover is then bent around a radius according
to the present invention to form the ridge bend 136. It will be
appreciated that the accordion folded section 140 must be relieved
in the area of the ridge bend 136 to allow folding along the ridge
bend. U.S. Pat. No. 3,913,294 discloses the use of a T-shaped cut
156 to permit folding of the ridge bend 136.
[0036] The transformation of the T-shaped cut 156 through folding
can be described by referring to the points at the intersection of
stem and crossbar of the T 142, the two ends of the T crossbar 144,
and the base of the T stem 146. When the ridge cover 124 is
accordion folded as shown in FIG. 8, the intersection of the T 142
and the base of the T 146 are substantially coincident. The asphalt
composition material is uncut along the ridge line from the
midpoint of the front end to the base of the T 146 and from the
intersection of the T 142 to the midpoint of the rear end 132.
Thus, the bottom layer of asphalt composition material is uncut
along the ridge line except for a discontinuity at the rear edge of
the accordion folded section 140. All the layers of the accordion
folded section 140 other than the bottom layer are cut along the
ridge line by the stem of the T-shaped cut 156. Only the bottom
layer of asphalt composition material in the accordion folded
section 140 requires bending to form the ridge bend 136.
[0037] When the ridge bend is formed in a '294 type ridge cover
according to the present invention as shown in FIG. 9, the
cross-bar cut of the T-shaped cut 156 allows the corners of the top
layer of asphalt composition material in the accordion folded
section 140 at the intersection of the stem and crossbar of the T
142 to move away from each other to accommodate the thickness of
the accordion folded section 140. The ridge bend is preferably
formed according to the present invention prior to making the
accordion folds to simplify the manufacturing process, although the
ridge bend may be formed after the accordion folding as well. It
will be appreciated that the transition from the bottom layer of
asphalt composition material in the accordion folded section 140 to
the next higher layer occurs at the base of the T stem 146. This
point is constrained and the accordion folded section 140 is
relatively inflexible. As a result, the '294 type ridge cover will
tend to press inwardly at the base of the T stem 146 and fold the
ridge cover sharply along the ridge line in the vicinity of the
base of the T stem 146. This can increase the likelihood of
cracking in this area as compared to the remaining portion of the
ridge bend which is formed around a radius according to the present
invention.
[0038] Another embodiment of a ridge cover 224 that uses a ridge
bend 236 according to the present invention is shown in FIGS.
10-12. In this embodiment, an I-shaped cut 256 is made to permit
folding of the ridge bend 236. FIG. 10 shows an exemplary i-shaped
cut 256. The second cross-beam of the I, closest to the forward end
230 of the ridge cover 224, allows the corners of the layer of
asphalt composition material above the bottom layer in the
accordion folded section 240 at the intersection of the stem and
lower crossbar of the I 246 to move away from each other to
accommodate the thickness of the ridge bend around a radius 236 as
may be seen in FIG. 11. This prevents the accordion folded section
240 from pressing inwardly on the ridge bend 236.
[0039] As may be seen in FIG. 12A, a cross-section along line
12--12 of FIG. 11, the ridge bend around a radius 236 of each ridge
cover 224 is unsupported against inward lateral pressure. FIG. 12B
illustrates the effect of a lateral compression force, indicated by
the arrows 260, on an exemplary ridge cover 224. Such a lateral
force might result from the stacking of a number of ridge covers
224 for shipping or storage. The accordion folded sections 240
press inwardly against the sides 234 of the ridge cover 224 and may
compress the ridge bend around a radius 236 resulting in a sharp
fold in the vicinity of the folded accordion section 240 that is
susceptible to cracking.
[0040] Another embodiment of a ridge cover 324 that uses a ridge
bend 336 according to the present invention is shown in FIGS.
13-15. In this embodiment, a cutout 354 is used to provide
clearance or relief for the ridge bend around a radius 336 in the
vicinity of the accordion folded section 340. The cutout may be a
generally rectangular aperture located across the ridge bend on one
or more layers of the accordion folded section 340. In the
embodiment shown in FIGS. 13-15, the aperture is formed in the
first and second layers of material above the bottom layer of the
accordion folded section 340. The aperture in the first layer,
defined by side edges 352, is wider than in the aperture in the
second layer, defined by side edges 350, in the embodiment shown.
The sides 350, 352 of the apertures are substantially parallel to
the line of the ridge bend 336 with the line of the ridge bend
being substantially at the midline between the sides.
[0041] As may be seen in FIGS. 14 and 15A, when the embodiment of a
ridge cover 324 with the cutout 354 is folded, the cutout provides
a relief adjacent to the ridge bend around a radius 336. As may be
seen in FIG. 15B, when a lateral compression force, indicated by
the arrows 360, is applied to the exemplary ridge cover 324 with a
cutout 354, the sides 334 of the ridge cover can meet to support
the lateral compression force without creating a sharp fold in the
vicinity of the folded accordion. It will be appreciated that the
distance between the one or more sides 350, 352 in the cutout, as
well as the number of layers in the accordion folded section 340
that include the cutout can be varied and that the radius of the
ridge bend and the thickness of the asphalt composition material
may affect the preferred configuration of the cutout 354 for a
particular embodiment of a ridge cover.
[0042] Roofing is subject to wind forces that can cause the roofing
material to lift away from the roof deck and, in extreme cases, be
torn away from the roof deck. It may be desirable to adhesively
fasten the exposed leading end 330 (FIG. 13) to the ridge cover
below to resist wind lifting. A wind seal adhesive is typically
provided on preformed ridge covers by applying areas of an adhesive
that will develop a strong bond with solar heating and the pressure
of the installed ridge covers on the wind seal adhesive. While the
wind seal adhesive requires heat and pressure to develop a strong
bond, it is somewhat tacky under storage conditions. Typically a
release tape or other form of release agent is required to prevent
ridge covers from adhering to one another or transferring adhesive
to undesired areas. The use of release tape is undesirable because
it must be removed at the time of installation, creating extra work
during installation and litter on the job site.
[0043] The use of a ridge bend around a radius permits a wind seal
adhesive to be applied without requiring a release tape or other
form of release agent. The application of a wind seal adhesive in
connection with a ridge bend around a radius is illustrated with
reference to the embodiment of a ridge cover 324 shown in FIG. 13.
Two strips of wind seal adhesive 356, 358 are applied adjacent to
the leading end 330 of the ridge cover 324. The strips of adhesive
356, 358 are applied on the lower surface of the ridge cover
opposite the upper surface which may be coated with granules. One
strip 356 is applied closer to the leading end 330 than the other
strip 358 so that the two strips do not face each other when the
ridge cover is bent around a radius to form the ridge bend 336.
Thus when the ridge cover 324 is folded for storage or shipping,
each of the strips of wind seal adhesive 356, 358 is on the inside
of the ridge cover facing uncoated asphalt composition material.
The ridge bend around a radius 336 causes the sides 334 of the
ridge cover 324 to be spaced apart as may be seen in FIG. 15A.
While the sides 334 of the ridge cover 324 may be pressed together
in the vicinity of the accordion folded section 340 when stacked as
shown in FIG. 15B, the leading end 330 tends to remain spaced
apart. Thus the wind seal adhesive strips 356, 358 are not
subjected to pressure prior to installation and they are not placed
in a condition that promotes strong adhesive bonding. Generally,
the wind seal strips 356, 358 will not contact any adjacent surface
and will not bond at all. If the wind seal strips 356, 358 do
contact another surface, it will be the opposing inside surface of
the ridge cover 324 where transfer of adhesive is not detrimental.
It will be appreciated that the wind seal as described in
connection with the embodiment shown in FIGS. 13-15 may be used
with any ridge cover that includes a ridge bend around a
radius.
[0044] There has thus been provided a novel preformed asphalt
composition ridge cover where the bend along the ridge line is
formed in a manner that reduces the susceptibility to cracking.
While the description of the preferred embodiment has been with
specific reference to FIGS. 1-15, it should be understood that
various modifications, additions and substitutions may be made to
the structure and method of the invention without departing from
the spirit and scope of the invention as defined in the appended
claims.
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