Is a Vapor Retarder Necessary in a Low-Slope Roof Assembly? If you have designed or built a low-slope roof with a single-ply membrane, at some point you will be confronted with this simple question: Is the vapor retarder necessary? By Blackpool Roofing|2016-10-06T05:00:00+01:00October 6th, 2016|Emergency Roofing Maintenance, Industrial Roofing, Roofers, Roofing, Roofing Industry News|Comments Off on Is a Vapor Retarder Necessary in a Low-Slope Roof Assembly? Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail