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Патент USA US2137889

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Nov. 22," 1938.
Filed June 13, 1936
Patented Nov. 22, 1938
I ,:.’;..~.2.1‘s7,ss9
William Gillett, permit, Mich.“ ‘
' ‘
Application June 1a. 1936, Serial No. 84,995
2 Claims. (Cl. 108-26)
This invention relates to a building assembly
and, particularly, to a cant strip for use therein.
There are numerous types of ?ashing for joints
in a building, as, for instance, between a roof and
5 a parapet wall.
Also, the application of thermal insulation to
roofs has decreased largely the formation of dew
on the underside of the roofs. When dew does
form, one of the most objectionable places for its
10 formation is at the side of a roof, from which
place the condensed dew may run down the side
walls of the building, with production of streak
At the same time, it is at this particular loca
15 tion that the formation of dew is most di?icult
to avoid. Thus, the parapet wall in winter pro
duces considerable cooling of the adjacent por
tions of an insulated roof.
It is an object of the invention to overcome
20 this excessive tendency to dew formation at the
meeting place of the roof and side wall. An
other object is to provide an improved ?ashing
strip that is an effective thermal insulator.
Other objects and advantages will appear from
25 the detailed description that follows.
The present invention comprises the novel fea
lateral surfaces as well as at its ends with a
waterproo?ng material such as a layer of asphalt
(not shown).
side of the parapet wall.
plurality of plies of the selected composition, with
layers l6, l1, and 18 of adhesive material se- lo
curing the several plies together. _
The adhesive layers are preferably waterproof.
Thus, they may be constituted of a bituminous
composition such as asphalt. The said layers
are spaced from each other, extend longitudi- 1‘
nally through the strip, and lie each in a plane
parallel to the surface or face IQ of the strip
that is outermost when the strip is in use in
the ?ashed assembly. Such an arrangement m
causes proper shedding of water and promotes
overall ?exibility of the strip.
The composition .of the cant strip is not only
thermal insulating and resiliently yieldable, as
stated, but also is constituted, preferably, of
felted ?brous material such as insulating ?bre 25
board of conventional type, supplemented by a
tures hereinafter described in connection with a
waterproof exterior envelope and/or inwardly
disposed waterproof layers, as described. .
terms being used to distinguish my improved
strip from the previously used ?ashing members
constituted largely of asphalt or equally heavy
material not possessing resilient yieldability and
35 not being effective insulators.
The invention is illustrated in the attached
drawing and will be described in connection
The cant strip is suitably constituted of a
?ashed building assembly or cant strip and, par
ticularly, a cant strip that is lightweight, thermal
3 O insulating and resiliently compressible, these
The layer I3 of built-up roo?ng or the like
extends, preferably, over the outer face of the
strip l5 and for anappreciable‘distance up the
I have used to advantage a cant strip consti
tuted of a plurality of plies, say 4, of wood ?bre 30
insulating board each of half-inch thickness, the
plies being adhered together by casein adhesive
or asphalt.
A common type of thermal insulating ?bre
board that I have used weighs about 15 to 20 35
pounds to the cubic foot and has a speci?c ther
mal conductance of the order of 0.33 to 0.37, in
the engineering system of units.
The functioning of the cant strip may be illus
trated by considering the behavior of the as- 40
sembly on an interiorly heated factory building,
in very cold weather. The insulation I2 is ade
quate to prevent such a low temperature overv
the major portion of the roof as to avoid forma
tion of dew under the roof deck ll. However, 45
which, for the purpose of illustration, may include ' at the edge portions, the cold parapet wall con
ducts heat away from the roof deck. There is
a ribbed metal deck II, a layer of thermal in
thus produced, unless my improved cant strip is
sulation l2, such as lightweight ?bre board, dis
posed over the deck, and an outermost layer I3 used, a low temperature that may cause dew
formation under very certain humidity oondi- 50
50 of waterproo?ng material that may be conven
tions within the building.
tional built-up roo?ng including asphalt-impreg
The use of my thermal insulating cant strip
nated paper.
My improved ?ashing strip l5‘ ?ashes the joint adds suf?cient insulation, at the critical side por
tion of the roof, to minimize the temperature
between the wall and the roof, as illustrated.
Suitably, the ?ashing strip is coated on all di?erence between the edge portion and the main 55
Fig. l is a perspective view of a building as
40 sembly ?ashed in accordance with my invention
and showing certain parts broken away for the
purpose of illustration.
Fig. 2 is a cross sectional view of a cant strip‘
suitable for use in the assembly if Fig. l.
Referring to Fig. 1, there is shownl a roof
portion of the roof deck and thus decrease the
probability of the formation of dew and conse
quent streaking of the side walls of the building
thereby under any ordinary condition of use of
the structure.
In addition to minimizing the possibility of the
formation of dew, the lightweight strip is easy to
handle and install, relatively inexpensive to
manufacture, readily sawed or cut to proper
10 length on the roof, and conforms well when
pressed against somewhat irregular surfaces‘ that
What I claim is:
1. A cant strip for ?ashing the joint between
a roof and side wall of a building comprising a
plurality of lightweight thermal insulating plies
of felted ?bres and adhesive disposed between 5
the plies for securing the same together.
2. A cant strip of triangular cross section
comprising lightweight, ?brous thermal insulat
ing material and a plurality of spaced layers of
waterproo?ng material extending longitudinally 10
throughout the strip and lying; each in a plane
are to be ?ashed.
extending approximately parallel to the face of
It will be understood that the details given are I the strip that is to be outward in the ?ashed
for the purpose of illustration, not restriction;
15 and that variations within the spirit of thein
vention are intended to be included in the scope
of the appended claims.
1 assembly.
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