Silicone-containing roof assemblies and methods for production and use
View Patent ↗An underlayment material has a fiber mat partially infused and/or coated with asphalt and coated with silicone coating. A selvedge edge, may be coated or uncoated. The back of the underlayment has a self-adhesive coating, which is protected before use by a siliconized release film. The upper surface of the underlayment is coated with silicone composition providing waterproofing and radiation control. When unsaturated, the selvedge edge of fibrous material establishes a reinforced bond with an overlying sheet. When saturated with asphalt, the bond at the selvedge edge between adjacent sheets is between the asphalt layer of the selvedge edge and the adhesive on the bottom of the adjacent sheet.
1. A building material with an upper surface and a lower surface, comprising:
a support web at least partially infused with asphalt;
a layer of silicone material applied to the support web infused with asphalt, covering at least a portion of an upper surface thereof and defining a selvedge edge on the upper surface that is not covered by the silicone material, wherein the building material has the following properties: tensile strength MD/CD (psi) 66/30; elongation MD/CD (%) 226/275; density of about 0.97 lbs/yard 2 ; tear strength MD/CD (psi) of 55/85 and adhesion to plywood (plf) of about 28.
2. The building material of claim 1 , wherein the asphalt is modified and contains at least one of styrene-butadiene-styrene (SBS), amorphous polypropylene (APP), styrene-isoprene-styrene (SIS), styrene-ethylene-butylene (SEB), styrene-ethylene-butylene-styrene (SEBS) or a combination of homo, block or co-polymers.
3. The building material of claim 1 , further comprising a layer of adhesive applied to a bottom surface.
4. The building material of claim 3 , further comprising a release sheet removably covering the adhesive on the bottom surface.
5. The building material of claim 1 , wherein the support web is made from a fibrous material.
6. The building material of claim 5 , wherein the fibrous material includes at least one of polyester, fiberglass, a combination of fiberglass and polyester, asphalt saturated felt-paper, polypropylene, polyethylene, or a combination of polypropylene and polyethylene.
7. The building material of claim 1 , wherein the building material has a weight per square foot in the range of 0.1 to 1.0 lbs/ft 2 .
8. The building material of claim 1 , wherein the building material has a weight per square foot in the range of 0.1 to 0.55 lbs/ft 2 .
9. The building material of claim 1 , wherein the asphalt is un-modified.