High Density Cellulose Insulation R Value

Polyurethane spray closed cell foam insulation.

High density cellulose insulation r value.

Dense pack cellulose insulation. A medium density batt offers r 13 for the same space. Insulation or other building material 9. However it is seldom used in canada despite its reasonable cost and efficiency.

Polyisocyanurate polyurethane foam insulation r values. Cellulose insulation is used as a filler material to fill various cavities and spaces but cellulose insulation boards and mats are also produced. So you can simply pile fiberglass deeper to achieve the r value you need. Cellulose insulation provides greater resistance to air leakage and for me this is a biggie.

The thermal conductivity of cellulose insulation varies with temperature moisture content and mass density. Insulation r values vary based on the type thickness and density of the insulation material. High density batts for a 2 by 6 inch 51 by 152 mm frame wall offer r 21 and high density batts for an 8 5 inch 216 mm spaces yield about an r 30 value. Has less of an advantage in tighter dwellings.

When we blow them with insulation we dense pack them to around 3 5 lb ft 3 56 kg m 3 density the leakage drops to 0 04 to 0 2 cfm ft 2 at 0 3 in. The r value of wet spray and dense pack cellulose insulation depends slightly on its installed density and the exact type of cellulose used but commonly ranges between 3 6 and 3 8 per inch 1 as measured by the standard astm c518 test. When cellulose is densely blown 3 0lbs ft3 or 48kg m3 or greater it is an excellent wall cavity insulation that provides a good r value at a reasonable cost. And while the low density fiberglass insulation used in attics rates a much lower r 2 0 per inch there is typically very little space restriction in attics.

The r value per inch decreases slightly as density is increased from 3 0 to 4 0 lbs ft3. It also can happen with fiberglass. Typical thermal conductivity values for cellulose insulation are between 40 and 50 mw mk. High r values and reduces leakiness significantly.

Aging effects comments. Has the greatest advantage in houses with leaky walls especially walls where one cavity is connected to the next plaster and lathe. 5 this is unbelievably impressive. Me thods and verification of density high density cellulose.

I think i mentioned this earlier. A higher insulation r value usually means a higher price point as well. 0 2 to 1 0 l s m 2 at 75 p. This does not just happen with cellulose.