Permafelt - anybody use it?

[slowthump]

I am getting ready to shingle my new garage and have contemplated using Permafelt synthetic felt as an underlayment. The product info states that it can survive 180 days of exposure without breaking down. Since I am shingling this by myself it will take me a while to get it all done and normal asphalt felt wrinkles to beat heck when rained on. When I shingled my house I put down the felt on the whole house and started shingling. Most of the felt had to be replaced by the time I got the shingles up to that strip of felt.
It is spendy at $140 for a 4x250 foot roll.

 

[twostory]

Yes, use a synthetic underlayment. They are tear proof and rated for 6 months exposure. Just make sure you use button cap nails, and follow the manufacturers nailing instructions.

Home Depot sells Grace Tri-flex 4x250ft ($100). Synthetic underlayments are great for DIY who take weeks to finish the roof.

 

[slowthump]

Thanks for the info.

 

[383]

Much better than tar paper, and easier to work with. 30 lb tar paper covers 2 square per roll, synthetic has 10 square per roll. It's also 4' wide instead of 3', so it goes on faster. It's tough, I've never seen it blow off like tar paper. Definitely worth the extra money.

 

[Falcon67]

Good info. They must have used something like that on the roof behind us - took those guys about a month to get it done. Looks more common - some in use on the re-roof job down the street. Problem - I need about 50' more than 250' dammit.

 

[slowthump]

The 250' roll will get me too as I will need 43' more than 2 rolls.

 

[5lima30]

I used a similar underlayment on my garage roof (rolled titanium) it is a gray color and has a small imbedded mesh in it. It was somewhat cheaper than the product you listed. Supposedly it has reflective qualities that make for a cooler garage as well. One thing I liked about it was that it IS much easier to walk on than traditional roofing felt. BTW I put metal roofing down directly on top of it. By using this product instead of felt I didn't have to use the "ice dam" rubber on th eaves per our local building code. YMMV.

 

[Falcon67]

Problem - I need about 50' more than 250' dammit.

Duh - I'm using #15 on the walls under the siding - I can just finish the last little bit with that or a $20 roll of #30.

 

[slowthump]

What kind of siding are you putting the 15# felt under? Are you putting directly between the siding and wall sheeting or are you making an air space with lath?

 

[Falcon67]

What kind of siding are you putting the 15# felt under? Are you putting directly between the siding and wall sheeting or are you making an air space with lath?

Under Hardipanel, no wall sheeting. And I might still not - last shop I just put the panel right on the studs with no wrap and never had a problem. Even when hosing off the wall with a water blast after using it as a backstop for playing mudball with the dog. Felt would just be a little insurance against water penetration at the panel seams. It does actually rain here once in a while - just not lately (as in most of this year).