Wet Tar Paper Roofing

Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof.

Wet tar paper roofing.

Black jack elasto kool 1000 5 gallon elastomeric reflective roof coating 10 year limited warranty item 139941. Unfortunately the organic elements of tar paper require a perfectly dry day to lay flat. The 30 pound tar paper is heavier and has much more asphalt in it. The paper has dew in the morning so ive been wiping it down with towels or old shirts and then waiting until it dries completely.

It would possibly mold if the tar paper was put over wet plywood but here again i would be more worried about the leakage between the plywood into the attic than between the tar paper and shingles. Traditional roofing felt also called tar paper or underlayment is felt saturated with bitumen also called asphalt. Roofing felt is made of compressed polyester or fiberglass fibers. Roof replacement is expensive.

Roofing felt or tar paper can be left out in the weather for weeks shedding rain water while the roof is in progress of being completed. Bitumen or asphalt is distilled from petroleum and is what makes roofing felt waterproof. While impossible to know unless you do an expensive analysis the asphalt used to make modern tar paper contains much more oxygen than it should. When shingles are placed on top of rippled tar paper voids are created which act as little greenhouses that collect heat and break down the shingle from the underside.

The tar paper made between 1900 and 1980 probably will last far longer than the tar paper made today. The only problem is that the house has trees on the east side so its like 9 o clock until i can shingle and even longer until the west facing side gets sun and dries. Can roofing felt get wet. The best roofing conditions are of course nice sunny days about 78 85 degrees but this is not reasonable all year in the vast climates we have in america or with some of our readers all over the world.

This moisture can lead to mold and mildew forming underneath the shingles. Roofing felt also known as tar paper serves as both an extra layer of protection between the shingles and the plywood and as a temporary moisture barrier until all the. This shortens the effective life of the shingles and can adversely affect the roof sheathing. When tar paper gets wet it buckles and ripples.

Black jack eterna kote 4 75 gallon silicone reflective roof coating lifetime warranty item 484330. How bad is it to shingle over wet tar paper. Whether you re building a new house or putting a new roof on your existing house installing tar paper first helps waterproof the roof and prevent leaks.