two layers of tar paper on the sidewalls than one. I’ve followed the advise a lot have given me about putting a second layer over the first when the first has been on the wall a while and shown signs of wear. There are other areas of the house where I’m putting the tar paper on as I am foaming and siding. Is two layers worth the extra effort here too or just stay with one. I’ve pretty much got to the point where I add the second layer if the first has been on the wall more than a month. Any input, as always, is appreciated.
Richie
Replies
I guess it depends on what you are installing over it, but as long as the origonal layer is intact and not torn, I probably wouldnt bother
The wall system is tar paper, 3/8 fanfold, vinyl siding. Thanks
Why are you using the fan-fold? that is usually used over other siding in order to provide a smoother surface for re-siding, it sounds like this is new construction or you are starting from scratch. The fan fold is very minimal for insulating value.
But to answer your question,If you are adding the fanfold i see no reason for more felt (tarpaper).......The reason is; the felt is already one drainage plane, the fanfold will act as another (IF it is taped) and the vinyl is another, how many do you want?
two layers of tar paper are strongly recommended for stucco, but for vinyl I can't see what it gives you other than a little possible insurance. felt shouldn't deteriorate that much in a month or two unless you're abusing it.
at the same time, what does it cost you? not too much either... little benefit for little cost seems ok to me if it makes you or the client sleep better...
k
Thanks guys. Its my house so a little extra time and a couple of hundred $ in tar paper are no prob. I am not taping the fan fold but it is tightly butted with hardly any spaces between panels. It does give an additional r2.8 (not much) but does help cut down drafts. I also like having the additional drainage plain. Like I said its my house and I'm gonna be here a long time [hopefully :)]. Thanks again.
additional r2.8 (
Sounds high
Where do I get this tarpaper, cuz I would like to corner the market if the r-value is that high?
lol. i think he was talking about the fanfold.
tarpaper will give a higher r-value, but you have to set it on fire.
k
Lol. yer right.