I was looking at Tyvek’s properties, and it looks like it sheds water well while having great vapor permeability. So I was thinking of putting it over a house that’s soaking wet inside from a long neglected roof — around here, people just board up properties (as per law) and then walk away. A real shame.
Anyway, if I pulled the roofing and used Tyvek for the summer — and pulled the plywood over the windows — maybe it’d dry out some this summer, in the heat.
Now if they only made Tyvek in black, I’d get better heat gain, too. 😉
Replies
I'm under the impression that the opposite is true. Tyvek is not intended to stop water infiltration, but is intended to stop airflow.
You may just create a big steamy mess inside that house.
There's a fairly new roofing underlayment out; the one I've used is called, I believe, TriPlex, but Typar and a few others also make it; most yards should have it in stock.
Comes in 1,000sq. Ft (3' wide) rolls and costs about $110 per roll....making it competitive with felt.
It's a little slick (the top surface gives a little more traction, but be sure you've got it stapled/ nailed off before you walk on it), so beware!!!, but it's also tough and goes down smooth without fighting wrinkles as much as felt.
Save your wrap for the walls.
This is the wrong material for roof underlayment.
Vapor perm is not an advantage in roofing.
Open the windows a crack, or mount a fan to dry.
Tyvek would work, but isn't really advised. When new it will shed liquid water quite well, but it begins to lose some of it's water shedding after several months exposed. It's also not recommended for roofs because it's so darn slippery.
Probably would be better to install some battens (for airflow) and then tarp over. Also, install more attic vents so that the place can dry out from the inside.
One roof with Roofguard II and never again anything else.
http://www.rooftopguard.com/
Joe H
Loved RTGII til I tried this. Doesn't shrink.
http://www.interwrap.com/titanium/
Oh, I wasn't planning to use Tyvek as underlayment, and I wasn't planning to leave it up there forever. I just need something to dry the place out over the summer -- shed water (rain) and breathe water vapor. Battens are a good idea.
By the way, it's a low, sloped roof. Even if I find, after drying them out, that the rafters aren't structurally sound, I intend to try to recycle them as flooring, where possible.
Tyvek is susceptible to UV degradation.
Edit: I read a "was" where there was actually a "wasn't" in the previous post.
Jon Blakemore
Edited 5/31/2004 10:37 am ET by Jon Blakemore
Tyvek is susceptible to UV degradation.
DuPont says it can be left uncovered for up to four months. That'd cover the summer around here.
I must say I have gotten some interesting responses to this lame idea, even learned some stuff. Thanks to all who posted!
What do you pay for TITANIUM-UDL compared to #15 felt. Also, TITANIUM-UDL covers 10sq., how much does felt cover per roll?
I think Titanium is about $110/roll. I never use #15 felt which covers 4 sq, but a roll runs around $15. Roofer's Select which has some re-inforcement is more. I prefer #30 felt ( 2 sq/roll) if I'm using felt. Titanium (and RTG II) takes about 1/3 the nails and consiquently about 1/3 the time to install. When the labor is figured in, Titanium is probably less expensive and it is certainly tougher.
where ya get that stuff? my tarps are getting old.
Spheramid Enterprises Architectural Woodworks
Repairs, Remodeling, Restorations.
ABC was stocking it. If they don't have any, call me by tomorrow and I'll get you some on Fri.
I will call them Thur., the shingles will be here Sat. AM. wooo-hooo..I can finally get to work..
Spheramid Enterprises Architectural Woodworks
Repairs, Remodeling, Restorations.
RoofersSelect is itchy.
Joe H