It is the in-situ manufacture of polyurethane foam. Two chemicals meet under high pressure in the spray gun and when mixed create a chemical reaction that causes the two liquid elements to expand and make foam. One chemical is a hardener, the same as used in spray paint. The other a resin, made from recycled plastic, an excellent reason to choose spray foam. The blowing agents used in spray foam are water based (HFO) so have a very low global warming potential, another reason spray foam is the greenest insulation solution.
YES! Both open and closed cell spray foam applications come with a 25 year manufacturers warranty.
YES! During application, spray foam, like most in-situ applied building materials, will release small amounts of chemical compounds into the air. Spray foam materials can also give off odours that may be noticeable by some people, but with proper ventilation, these odours will subside. Several spray foam products have been independently tested (ULe GreenGuard, CAN-ULC 774, CA 01350) for release of volatile organic compounds, and no significant levels have been measured after the foam has cured. One study performed by the American Medical Association, assessed the toxicity of a number of foam plastic insulation products and concluded that cured polyurethanes present no toxicity problems for humans.
Open cell spray foam is a low density, soft, flexible foam, that uses trapped air as its primary insulation medium. Whereas closed cell foams are medium density, rigid foams, that trap gases produced as the foam is applied, these gases are called blowing agents and have a better insulation value than still air. Both foam categories provide excellent insulation and air sealing. Although both are made using almost identical chemical reactions, there are some inherent physical property differences that often determine which product is chosen for a particular project.
Closed cell foams, by nature, are resistant to moisture absorption, and are approved by FEMA as a flood-resistant material. Open-cell foams can absorb and retain liquid water at varying rates. It is important to consider the different properties for each foam type for each application.
Because of its rigid nature and ability to adhere to almost all materials, closed cell spray foam can provide structural enhancement to any building it is applied in. The structural support a building has can be significantly increased with the addition of as little as 50mm of spray foam.