Kahrs Installation Items, Combo Underlayment 3538 It's required by EcoStar for

It's required by EcoStar for their Goldstar Warranty

100% wool carpet in a short tight linear texture

Not for concrete slabs with radiant heat

provides a patented system of moisture protection reducing mold and mildew

indoors or outdoors

Kahrs Installation Items, Combo Underlayment 3538 It's required by EcoStar forGreat all in one underlayment for moisture protection and sound reduction Khrs Combo Underlayment is a two ply polyethylene film with flexible polystyrene granules sandwiched between to provide a dual moisture barrier with a thickness of 3 mm. It has a compression recovery of 80% (ASTM D1055) without loss of resilience. It also has a good sound rating (ASTM E 90 and E 492, STC = 59, IIC = 59) which means it provides very good sound deadening