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.

Who uses JM Spider?

JM spider is most commonly used in the Custom estate home market as an upgrade to traditional fiberglass wall batt insulation.

Where do I use JM Spider?

JM Spider is best suited to insulate wall cavities.

What is JM Spider?

JM Spider® is a Formaldehyde-free™, spray-in fiber glass insulation system that fills new and existing cavities without gaps or voids in the insulation coverage, for superior thermal and acoustical performance. Our unique design enables the fibers to more effectively fill tight spaces around pipes, wires and electrical boxes. Ideal for both retrofit and new construction, JM Spider® is naturally fire-resistant and does not promote the growth of mold and mildew. The insulation also installs faster and easier and does not settle over time.


Upgraded caulk product used for

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.

Roxul Insulation

ROXUL’s line of fire-resistant insulation for residential use includes both thermal and soundproofing products:

ROXUL ComfortBatt® is thermal insulation for use in exterior walls, attics and crawlspaces. It provides indoor comfort and energy savings all year ‘round.

ROXUL Safe’n’Sound™ is soundproofing insulation for use in interior walls, ceilings and floors to help create a quieter home.

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.


Plastic barrier most commonly used as a vapor barrier in Exterior Walls and Ceilings.  Is installed between framing and drywall.  Also used in Attics to seal over penetrations such as framing voids.

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.