Roof Rigid Foam Insulation Stc Rating

The thicker the better for both thermal and noise insulation.

Roof rigid foam insulation stc rating.

The higher the stc rating the more effective the barrier is at reducing the transmission of sound. There s a reason polyiso rigid foam insulation is used in more than 70 of commercial roof construction as well as in many residential builds. Batts and loosefill insulation in attics must not restrict the ventilation air at eaves. R tech panels are an engineered rigid insulation consisting of a superior closed cell lightweight and resilient expanded polystyrene eps with advanced polymeric laminate facers.

Polyiso is an easy cost effective sustainable and energy efficient construction material. Walls in real buildings may or may not be. Several years ago johns manville measured the sound transmission loss and stc ratings for a number of wood framed exterior walls with both fiberglass and spray foam cavity insulation. This foam board insulation is available with straight or tongue and groove edges to help limit air movement.

Choose rigid insulation wisely and consider the effect its characteristics will have on the performance of the your project overall product cost and the best way to get the bang for your buck. However in real construction a batt would be cut to fit around utilities and boxes leaving sound transfer cracks. This can range from 0 to 100. For roof slopes less than 1 in 6 or for cathedral ceilings the unobstructed vent area must not be less than 1 150of the insulated ceiling area.

First spray foam has the best stc rating of all the options. It has an stc rating between 44 and 68 depending on thickness and density. Acoustimac acoustic insulation eco cellulose comes in soft yet rigid 48 x24 x2 sheets. It ties with rock wool batts for an stc of 50 in a laboratory test environment.

R tech rigid foam insulation. For example a wall with an stc rating of 68 means that noise levels on one side of the wall are 68 decibels higher than on the other side of the wall. R tech is available with factory adhered metallic reflective facers white facers or a combination of the two. Provide separation of foam insulation from interior of the building with a 15 minute spaces such as interior corridors and service areas provide sound transmission class stc ratings of not be less than 50 45 if field tested when tested in access full source.

With a density of 4 lb ft it can be used in walls ceilings or floors. Why open cell oc spray foam is best for sound attenuation. In the lab where stc ratings are generated walls are air sealed. Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same.