I’m building a new workshop this coming spring (very excited) and am working out details now. I plan to side with cedar shingles backprimed with oil-based paint and install a Homeslicker rainscreen behind them. I have searched this site extensively on housewrap and have concluded that 15# felt would be the best choice; I would use Certainteed Builder’s Select fiberglass-reenforced.
The problem is I’ll be siding after work at my regular job and on weekends, and it will take many months for me to get the whole job done. I’m concerned that the felt paper will deteriorate due to UV radiation. I’m also worried about wrinkling as it gets wet. My framer wants to use plastic housewrap. It appears that Typar would be the best plastic choice due to it’s stability when exposed to UV (I’ve read 4 years). No question it is easier/faster for them to apply it. I’ve read about some folks concern that tannins from the cedar will deteriorate the plastic wrap. Since I’ll be backpriming and using a rainscreen, am I getting worried over nothing? Should I have them install Typar and then tear it off and apply felt as I progress with the shingling? (I won’t be installing windows until I have the final housewrap in place.) This seems like a terrible waste, but I’ll do it that way if the BT community thinks it’s best. Is it kosher to put felt over the Typar? Somehow this doesn’t seem like a good idea.
Conrad
Replies
I prefer felt.
15lb should last, if you are concerned ... go with 30.
house wrap is quicker/easier (especially with 2 guys) ... but that's about it.
Jeff
Buck Construction
Artistry In Carpentry
Pittsburgh Pa
Jeff,
You wouldn't be concerned about leaving the felt exposed for several months?
You wouldn't be concerned about leaving the felt exposed for several months?
Go ahead and use the 15 lb felt. If it takes a long time and the felt starts to deteriorate, add a second layer to the part that's still open. Felt will last a long time on walls if it's fastened properly.http://www.quittintime.com/ View Image
nope.
it'll fare better than housewraps in my opinion.
heck ... wrap it in 30lb and call it done!
Jeff Buck Construction
Artistry In Carpentry
Pittsburgh Pa
Thanks for the advice, gents.
Conrad
<house wrap is quicker/easier (especially with 2 guys) ... but that's about it.>Every job I've sided, that was tar papered by the framers or others, have had rounded inside corners and excessively wrinkled outside corners. We have to cut out these places, and replace with sharply creased paper, which is a whole lot thinner at the crease.Wrinkled tar paper is great for popping lines, too.and it makes yer hands and knees black.Typar.http://www.tvwsolar.com
I went down to the lobby
To make a small call out.
A pretty dancing girl was there,
And she began to shout,
"Go on back to see the gypsy.
He can move you from the rear,
Drive you from your fear,
Bring you through the mirror.
He did it in Las Vegas,
And he can do it here."
>>I've read about some folks concern that tannins from the cedar will deteriorate the plastic wrap. For what it's worth, the Typar manufacturer claims it is more resistant to surfactants than Tyvec and other housewraps. http://www.typar.com/pdfs/Typar_TopTenReasons.pdf Reason #5: Surfactant resistance
"Unlike some other housewraps, Typar will not degrade over time due to surfactants. Typar successfully resists cedar oil from siding ..."
Hmmm. for sidewall shingles I don't pop lines, I use a straight edge, well on roofs too. And I can't get my knees black on the wall, I keep falling off (G).
Felt for me.Spheramid Enterprises Architectural Woodworks
Repairs, Remodeling, Restorations
They kill Prophets, for Profits.
Conrad,
I'd go with the felt. I've seen it last quite a while on an exterior exposed to the elements. I'm somewhat embarrassed to admit that though; life's little delays you know.
OTOH its hard for me to imagine how putting felt over the Typar would cause a problem. Thinking out loud... there is a potential for liquid water to get trapped there but that would require that water vapor move outward through the Typar to condense on a colder felt surface? If a little condensation did form in that interface what damage would it cause?
On the 3rd hand, its hard to imagine the tannins getting past the primer and rainscreen in sufficient quantities to damage the Typar.
Not a lot of help am I. ;)
Edited 2/1/2009 9:54 am ET by semipro