Champion Cellulose Fiber Insulation

Mold Resistance

A frequent argument against using Cellulose insulation is the myth that it is more prone to mold than other insulation materials. This is simply not true. Backed by rigorous testing, Cellulose insulation meets all of the standards established by the ASTM C-739 for fungi resistance. In addition, Champion’s Cellulose insulation also meets the stringent Federal Specifications HH-I-515D for use in government structures.

The organic nature of Cellulose insulation means that, as the humidity rises, moisture is suspended as a vapor. The natural capillary action means that the vapor will pass freely out of the insulation as the humidity drops. Other insulating materials can cause this vapor to condense into liquid form and pose a serious rot or mold issue if enough water is present. This is not the case with Cellulose insulation.

Moisture Absorption

Federal Specification HH-I-515D permits as much as 15% moisture by weight. Champion’s Cellulose insulation was subjected to 90% relative humidity test by Underwriters Laboratories Inc. and was found to have only 6.3% moisture absorption. In normal operating conditions in attics and walls, water absorption is less than 5% and will not affect the performance of Cellulose insulation.