½ pound – Open cell

Open-cell foam is porous, allowing water vapor and liquid water to penetrate the insulation.  It typically has R-values of 3 to 4 per inch (RSI-0.53 to RSI-0.70 per inch).  Open-cell foam is soft when cured, with little structural strength.  It requires trimming after installation, and disposal of the waste material.

Spray Foam

Spray foam is a type of insulation that is sprayed in place through a gun. Polyurethane and Isocyanate foams are applied as a two-component mixture that comes together at the tip of a gun, and forms an expanding foam. Cementitious foam is applied in a similar manner but does not expand. Spray foam insulation is sprayed onto concrete slabs, into wall cavities of an unfinished wall, against the interior side of sheathing, or through holes drilled in sheathing or drywall into the wall cavity of a finished wall.

Rim Joist

In the framing of a deck or building, a rim joist is the final joist that caps the end of the row of joists that support a floor or ceiling. A rim joist makes up the end of the box that comprises the floor system.

The header is to a rim joist what the top or bottom wall plate is to an end stud.

Off gassing

Outgassing (sometimes called off gassing, particularly when in reference to indoor air quality) is the release of a gas that was dissolved, trapped, frozen or absorbed in some material.  Outgassing can include sublimation and evaporation which are phase transitions of a substance into a gas, as well as desorption, seepage from cracks or internal volumes and gaseous products of slow chemical reactions.

Joist End

The end of a floor joist is often a tricky place to insulate.  It can sometimes be efficiently insulated with a fiberglass batt. Quite often spray foam insulation is best due to the limited space and access.


Established in 1986, Icynene Inc. offers a complete portfolio of high-performance spray foam insulation solutions. In the past 25 years, more than 3 billion board feet of Icynene spray foam insulation has been installed in more than 300,000 residential and commercial projects.

Frost Wall

An interior wall construction from wood framing designed to create a warm space between the interior conditioned living space and the exterior concrete foundation wall.  This area is often insulated using Spray foam due to its ability to insulate tight and complicated spaces.


A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is forced against by moment and shear stress.[1] Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs. Mechanical Room

2 pound – Closed cell

Closed-cell foam is non-porous, and not moisture-penetrable, thereby effectively forming a SEMI-permeable vapor barrier.  Closed-cell foams are superior insulators; it can attain R-values of 5 to 8 per inch (RSI-0.88 to RSI-1.41 per inch).  It is very strong, and structurally reinforces the insulated surface.  Unlike open-cell foam, closed-cell foam rarely requires any trimming, with little or no waste.

Air Chute

Styrofoam baffle used as an retrofit product where cardboard insulation stops are not in place. The air chute is mounted to the underside of the roof deck from within the attic. It allows fresh air to carry in from the soffits and over the attic insulation.

air chute, soffit ventilation

styrofoam air chute used in place of cardboard stop