Static structures (e.g. – buildings) – Wall – ceiling – floor – or roof designed for ventilation or...
Patent
1986-08-13
1988-01-19
Perham, Alfred C.
Static structures (e.g., buildings)
Wall, ceiling, floor, or roof designed for ventilation or...
523096, 52419, 52420, 52540, 52746, 52748, E04D 510, E04D 512
Patent
active
047197340
DESCRIPTION:
BRIEF SUMMARY
This invention relates to building products and more particularly discloses an improved waterproofing membrane.
Existing waterproofing membranes typically consist of bitumen or rubberised asphalt compositions which are applied either directly to the substrate in a molten state or in the form of self adhesive sheets. While such membranes are more or less satisfactory where the substrate surface is below ground level and shielded from direct sunlight, in other above ground locations (such as roofing installations) where the natural moisture content of the substrate causes a buildup of vapor pressure blistering often occurs. Although these blisters can be removed by piercing the material at each point to relieve the pressure this of course requires the subsequent repair of the membrane if the moisture barrier is to be preserved.
It is therefore an object of this invention to ameliorate this disadvantage and accordingly a self adhering waterproofing membrane is disclosed which has over the adhesive face thereof a vent means adapted upon installation of the membrane over a substrate to release any vapor pressure which would otherwise cause blistering and said vent means being further arranged so that a sufficient portion of said adhesive face engages the substrate to enable the membrane to adhere thereto.
Preferably this vent means comprises sheets or strips of inorganic or organic material which are applied to the membrane during manufacture and operate to prevent the bonding of that portion of the membrane over which they extend. Although the invention is not limited to any specific composition for these sheets or strips they are preferably porous in nature and may comprise for example a polyester, fiberglass, plastic or glass based material.
Preferred embodiments of this invention will now be described with reference to the attached drawings in which:
FIG. 1 shows a self adhesive membrane and vent sheet according to this invention being applied to a substrate.
FIG. 2 shows a cross-section of a preferred form of joint using the membrane of FIG. 1 and
FIG. 3 shows a cross-section of a joint for use with an alternative form of membrane.
Referring first to FIG. 1 the membrane may comprise a moisture proof layer 1 of a rubberised asphalt composition approximately 1.6 mm thick with a layer of spunbonded polyester 2 (such as one known in the trade as REEMAY 2400 Series) bonded to the adhesive face 3 thereof. This polyester sheet is preferably formed with a series of 50 mm diameter apertures 4 across its areas so that a substantial portion of its adhesive face 3 (with this embodiment about 85 percent) is still able to adhere to the substrate 4A over which the membrane is installed. By virtue of the porous nature of the polyester sheet however any vapor pressure which builds up after installation is vented to the edges of the membrane before blistering can occur. Such a construction also provides the advantage during initial application of the membrane of enabling any trapped air pockets to be easily dispersed to the edges of the sheet.
With this particular embodiment of the invention the membrane may be laid in the form of overlapping sections. Along one edge thereof the vent sheet is inset a distance "A" of approximately 65 mm to form a side flap 5 and along the opposite edge 5A this sheet preferably overlaps a distance "B" of about 20 mm. This arrangement enables the edges of adjoining sections 6 and 7 to conveniently interfit (as shown in FIG. 2) in such a manner that the moisture proof layers 1 and vent sheets 2 respectively overlap and preserve both both the waterproof barrier and a vapor passage across the joint. Any trapped air or vapor is thus free to migrate either along the membrane strips or across them to the perimeter of the substrate where it is released to atmosphere. Although the vent sheet 2 is also shown as being inset from the end of the membrane it may in fact be co-terminal along this edge with the moisture proof layer 1. The ends of adjacent membrane sections in this case would be arranged to a
REFERENCES:
patent: 2125694 (1938-08-01), Sattig
patent: 3135069 (1964-06-01), Schuller et al.
patent: 3483664 (1969-12-01), Funk et al.
patent: 3505770 (1970-04-01), Bennett
patent: 4490952 (1985-01-01), Winston
patent: 4588458 (1986-05-01), Previsani
Fell Leonard G.
Fell William L. K.
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