ASTM D4869 Saturated Organic Asphalt Roofing Felt

Asphalt Saturated Organic Roofing Felt with Different Specifications

Asphalt roofing felt introduction:

Asphalt roofing felt is applied over the roofing deck before installation of asphalt shingles it is highly recommended as an underlayment for architectural shingles. It is made from raw paper saturated with asphalt

Asphalt roofing felt types:

Asphalt roofing felt can be classsified either by thickness or by weight. Thickness is just for reference. The different types of roofing felt paper are different weights which results in different thicknesses. The #30 felt is twice as heavy as #15 felt and it is substantially thicker, although no exact thickness figures are provided.

Common used types are belowed four types:

1.ASTM D4869 #15

2.ASTM D4869 #30

3.ASTM D226 #15

4.ASTM D226 #30

Why is asphalt roofing felt requried under asphalt shingle?

Asphalt shingles are the most commonly used covering for sloped roofs. The type and amount of roofing felt to apply varies according to roof slope. If the slope between 3:12 and use two layers of #15 felt for asphalt shingles. Is the slope is greater than 4:12-which provides more water drainage from the roof-use one layer of #15 felt. Use #15 for asphalt shingles weighing 240 pounds per square or less; consider using #30 only if shingle weight is heavier than 240 pounds.

Asphalt roofing felt tips?

When applying roofing felt, pay careful attention to areas that receive the most water runoff, including roof hips, ridges and areas around adjoining walls. Cover those areas with an additional 6 inches of felt, from each direction.