23 07 00 - Wisconsin Department of Administration

The top of ducts insulated with fluid-applied ductwork insulation shall be sloped using tapered insulation prior to applying fluid-applied insulation. Tapered Insulation shall be ASTM C1289, Type II, Class 1, Grade 2; rigid board polyisocyanurate insulation with felt or fibrous mat facing on both sides, factory tapered to 1/2” per foot slope. ................
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