15+ Built Up Felt Roofing Pics. Start at the bottom of the roofline and work up so any water that gets through the roofing material installing the roofing felt does take care, but can go very quickly. A built up felt roof is an established method of weather proofing roofs, normally flat roofs, by using more than one layer of bituminous roofing felt which is felt is what keeps the rain out;
Flat or built up felt roofs.
The roofing felt should be applied in layers that overlap. Sometimes called roofing felt underlayment, roofing tar paper, or roll roofing, this is a layer of protection installed between the roof deck and the roofing shingles. Bituminous waterproofing systems are designed to protect residential and commercial buildings. 12yr, 15yr, 20yr & 25yr with.