Top Products from the Greenbuild Expo Floor: Part 2

General Woodcraft's residential rainscreen system attaches to the exterior sheathing with clips rather than furring strips, and is available with FSC-certified wood siding.

Recycled content from Toto/Crossville and VaproShield

Speaking of Toto, Crossville is now including about 4% porcelain from Toto's manufacturing stream for use in its tile products. This pre-consumer recycled porcelain is verified by Scientific Certification Systems and comes from just across the border in Georgia. According to the company, they now use more waste products to create new products than they generate (they recycle 12 million pounds annually). The 4% is just a part of the recycled content the company offers, and some of their tiles contain 50% post-consumer content.

One of the more interesting products at the show also happened to be at a smaller booth off the main corridors: ReNewShield from VaproShield. This is a vapor-permeable air barrier (75 perms) that is made from 70% post-consumer PET from water and soda bottles. ReNewShield can handle 120 days of UV and climate exposure before cladding is installed, according to the company.

Residential/light commercial rainscreen

General Woodcraft, makers of Mataverde hardwood decking and siding, introduced its Climate-Shield Rain Screen Wood Siding System at Greenbuild. Like a simplified commercial rainscreen system, the siding slides into clips that are screwed into the sheathing, creating an air space between the sheathing and the housewrap that allows moisture to escape. It does not require furring strips, and no screws penetrate the siding. A number of siding profiles are available; it can be installed vertically; and FSC-certified wood is available.

Hemp insulation

There was a time when industrial hemp was one of the U.S.'s most important resources (anyone remember the World War II film "Hemp for Victory"?), but that time is long past, and it is illegal to grow industrial hemp in the U.S. without a special permit--even though it has virtually no psychoactive ingredients. The fibers are, however, extremely versatile, and the plant grows quickly and in poor conditions, making it, potentially, a very attractive product.

Two companies were showing their hemp insulations at Greenbuild: American Lime Technologies, which is currently importing its Breathe Insulation, and Mem Inc., which had its NaturHemp on display. Neither product uses a chemical binder, and both are held together with a small amount of polypropylene or polyethylene fiber (<5%). NaturHemp uses ammonium sulfate as a flame retardant, and we are checking on Breathe's flame retardant, as theirs is "proprietary."

Breathe is currently imported from Denmark by special order (and at considerable cost), but the company has plans to set up a manufacturing facility in Wisconsin using fibers imported from Canada. NaturHemp is currently grown and manufactured in Canada and comes in 5.5" thicknesses in dimensions of 16" x 48" or 24" x 48". These products have an R-value similar to other fiber insulations (around R-3.7 per inch), with none of the binders or high firing temperatures of fiberglass or mineral wool. It is fairly rigid and compresses slightly to friction-fit inside the studs, similar to mineral wool.

Mem claims it will not sag, but like cotton and wool batts, installation is likely to be tricky, since hemp is a tough fiber and is not easy to cut. I took a bread knife to our sample, and it was easier to cut with than cotton or wool insulations I've tried, but finding the right tool/saw/blade will be key to simplifying installation, and be prepared for some hemp on the floor.

So there you have it, new products from Greenbuild Toronto! We will be covering some of these in greater detail later, and writing up others that we didn't get a chance to review here, such as Carrier's 13 HSPF air-source heat pump and Syntheon wall system that acts as a continuous insulation. So stay tuned!