2007-06-26 00:57:04 · 8 answers · asked by Anonymous in Home & Garden ➔ Do It Yourself (DIY)
It's an added layer of protection. Go for the heavier weight to get even more. I have seen roofs done without any asphalt felt at all and they work, but get a little water under a shingle and you know you will have a problem.
Most building codes in areas with a certain number of winter days below freezing now require a waterproof underlayment to be applied 3' up from an overhang above a heated area, usually along the lower edge of a roof. The idea is to prevent water from collecting behind an ice dam and seeping in under the shigles and down the interior walls. This material is a very tough, self-adhesive membrane that seals up around roofing nails. It is also recommended for roofs with a very shallow pitch.
2007-06-26 01:00:57 · answer #1 · answered by Anonymous · 0⤊ 2⤋
It is necessary with installation of shingles for an added layer of protection, but my aunt is building a new house right now and she is using a type of roof decking and wall sheeting that does not require felt paper or any type of house wrap. I am not sure what the name of it is, but at the seams there is some type of tape that goes over them to seal out any moister. I guess it just depends on the type of material your roof decking is.
2007-06-26 01:55:14 · answer #2 · answered by J D 3 · 0⤊ 1⤋
Certainly it's the most common underlayment for roofing, especially Asphalt or fiberglass shingle. 90 lb. is accepted still.
In days of old "TAR PAPER" also added a level of security in that the nails would eventually be somewhat sealed by the Paper, reducing the risk of leaks.
2007-06-26 01:01:56 · answer #3 · answered by DIY Doc 7 · 2⤊ 1⤋
It depends on the type of roofing material. If installing rolled roofing then it is not required. For shingles it is not needed except for were stated by local building codes. When installing slate, concrete or clay tiles, cedar, or metal roofing underlayment is required. Just remember to check local building codes so you do not have any problems later should you decide to sell. Hope this helps.
2007-06-26 02:34:07 · answer #4 · answered by John S 2 · 0⤊ 3⤋
Yes. Not only does it seal over the plywood joints but it makes it easier to see the chaulklines. You know,those things that allow you to keep your shingles going on a straight line!
Jeez, a bunch of bleeping geniuses!
2007-06-26 08:41:49 · answer #5 · answered by charlie_the_carpenter 5 · 0⤊ 1⤋
Yes. It keeps your shingles from drying out prematurely.
30lb.
15lb is garbage.
2007-06-26 14:27:38 · answer #6 · answered by Anonymous · 0⤊ 0⤋
you can get away without it, but for 3 reasons i would suggest you use it
1. extra layer (especially important if ice dams are a possibility)
2. code
3. it will give you more traction than wood
2007-06-26 07:01:43 · answer #7 · answered by mrrosema 5 · 0⤊ 1⤋
Yes!!! You will be sorry later if you don't.
2007-06-26 02:00:09 · answer #8 · answered by Mr fix it 3 · 2⤊ 0⤋