Specialists in the field
We understand the insulation needs of your homes like no other. Our experts suggest the right solution, taking into account the existing structure and the climatic conditions your home will have to endure. We follow systematic installation procedures and make sure nothing is left undone, including cleaning the premises after.
It is the more common of the two types of polyurethane spray foams. In the trades, it is known as “medium-density” or “two-pound” foam. Closed-cell polyurethane foams have R-values around 6.0-7.14/in.
Closed-cell foams resist water penetration and moisture build-up. Moisture can eventually attract bacterial growth, promoting mold, which can eat away at wood and compromise structural integrity. Closed-cell foams can be exposed to water without absorbing it, making it particularly useful against a subgrade foundation, for example. It does not expand in volume as much as open-cell foams do.
The Insulating values from closed-cell foams are often enough to preclude full-cavity fills. Once cured, closed-cell foam assumes a very rigid structure and can add some strength to walls, roofs, and ceilings.
Closed-cell spray foam insulation is also dense enough to insulate against air movement, preventing drafts and keeping in regulated temperatures. This density also prevents mold growth because temperature control can cut down on humidity, which spawns mold. In order to maintain their resistance, closed-cell foams are usually dense and strong and resemble solids when they fully form and cure.
It is applied to open wall cavities, attics, and all interior areas not exposed. It also carries sound deadening properties being a less rigid foam. Open-cell carries R-values of 3.6-3.8/in. All though open-cell doesn’t match the insulating capabilities of closed-cell foam, but it still has its applications. In industry, it is commonly called “half-pound” foam. Open-cell foam does not block vapor but instead allows it to pass through the foam matrix. It is particularly effective in hot climates where loads are primarily cooling. It is cheaper than closed-cell foam, and less dense. When installed in wall cavities, the foam may overfill the cavity. Later, the excess is trimmed away to apply the Sheetrock.
While there are a variety of materials that can be used, including styrofoam pellets or loose fiberglass fibers, the most common material used for blow-in applications is cellulose material.
Made from recycled newspaper, cardboard, and other wood-based materials, blow-in cellulose is treated with boric acid and other substances that make it flame resistant and mold-resistant. It is then packaged in tightly packed bales or bags. Installation involves the use of a mechanical blower/hopper that churns up the cellulose material with paddles to loosen it and mix it with air, then blows the fluffy insulation through hoses to wherever it is required.
They are available a variety of R-values, thicknesses and pre-cut widths and lengths. Batts are available plain (no facing), or with kraft paper facing or other types of vapor retarder facings. Tabless batts (also known as friction fit), that fit snugly in the wall cavity and stay in place without any fasteners until the wall finish is installed, are available with stapling flanges to hold them in place. Both tabless batts and the type with stapling flanges are acceptable for use in the ICC building codes and ASTM, ENERGY STAR and RESNET standards.