Modified bitumen membranes are used for all roofs that are either flat or with a pitch less than 2/12. Proper installation, by highly experienced roofers, will result in a very substantial waterproof roof for years to come. Two layers of modified bitumen over and underlayment of fiberglass base sheet is the best method utilized by Redwood Roofers to insure a leak proof roof.

 

Used predominantly in the commercial roofing market, modified bitumen is also viable in the home market where flat to just under 2/12 pitch roof areas are present, and for deck over an enclosed living space.

 

Redwood Roofers always recommends the use of two layers of modified bitumen due to its extended durability; the 1st layer of to be smooth, and the 2nd layer to be granulated. The granulated layer is available in many different colors.