Loose Fill Specifications

Bellwether Materials developed a proprietary blend of cellulose and sheep’s wool to create the world’s most effective loose-fill insulation for retrofitting existing walls. The combination of springy wool fibers and the density of cellulose make use of the best features of both materials to form a durable loose fill that flows into tight cavities never leaving gaps in protection.

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INSTALLATION

Our loose fill uses standard cellulose blowers to install. The unique combination of wool and cellulose means that the material does not block blowers and there is at least 20% less dust. The product installation density is about 23% less than standard cellulose fills.

PRODUCT AND MATERIAL PROPERTIES

PROPERTIES PERFORMANCE TEST METHOD
R-Values
2 x 4 Wall R-13 ASTM C-518
2 x 6 Wall R-21 ASTM C-518
Flammability
Critical Radiant Flux >/= .12
Smoldering combustion </= 15%
Environmental
Corrosion Resistance Acceptable ASTM C-739-91
Fungi Resistance Acceptable ASTM C-739-91
Moisture Absorption Acceptable ASTM C-739-91
Odor emission Acceptable ASTM C-739-91
Physical
Density 1.65 pcf ASTM C-739-91
Thermal R 3.8 R/inch @ 4″ ASTM C-739-91
Odor emission Acceptable ASTM C-739-91
Moisture absorption Acceptable ASTM C-739-91
Starch content Acceptable ASTM C-739-91

All information above is subject to change as we do further research and testing