New Roofing Technical Bulletin No. 3018 – Determining Minimum R-Value on Tapered Insulation Systems.
We are pleased to announce Foam-Control Technical Bulletin Roofing No. 3018 is now available. The bulletin provides information on the minimum thickness of Foam-Control when part of tapered roof insulation.
In general, the thickness of roof insulation must meet minimum prescriptive R-values at 4 ft. from drain locations when insulation is tapered ¼ in. per foot.