Tyvek or tar paper under fake stone?
shearwater
| Posted in Construction Techniques on
On the cottage I’m building in coastal Maine, the owner (me) has asked the builder (me) for cultured stone on the exposed foundation and over the walls of the daylight basement. I see that some manufacturers (e.g. Eldorado) recommend tar paper plus a base of expanded metal mesh over OSB sheathing. They are silent on using Tyvek instead… is there any reason to avoid using Tyvek in this particular application? Thanks for your thoughts.
Replies
For tried and true moisture resistance - I'd go tarpaper
but if my customer were sederiously worried about wind excange through the masonry, I would do Tyvek and then tarpaper
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Taunton University of Knowledge FHB Campus at Breaktime.
where ...
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And how do you feel about Mike Smith's allegiance to another reinforced film product, Rooftop Guard II, that kicked felt off his windscreen?
I use that on roofs all the time since he introduced me to it, but there is really no need for it under siding
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
BTW, Where on the coast are you living life the way it is meant to be lived?
Welcome to the
Taunton University of Knowledge FHB Campus at Breaktime.
where ...
Excellence is its own reward!
Thanks for the replies, looks like the votes are for tarpaper. This BTW is in Boothbay ME, on Barter's Island.
Sorry about my ignorance, but what is JLC?
So I'm concluding it's tarpaper/felt, then expanded metal mesh fastened with screws & fender washers, then scratch coat then fake stone. As you can see from the photo, where the foundation is above grade I've installed 2" EPS foam and then durock fastened with tapcons. The OSB (not yet added in photo) on the pony walls brings the two surfaces to an even plane, and I plan to run the mesh right down over the durock too, using more long tapcon screws right into the concrete.
There are a lot of very natural looking products. One that I've found at $3/sf for flats (plus shipping) is Hammerstone (http://www.hammerstone.net) The samples I ordered look quite acceptable and you probably can't beat the price.
We used a product by Eldorado Stone, series "Top Rock," color "Rialon" and it looks super.
JLC = Journal of Light Construction.
BTW, you can also see a good article in Oct./Nov. 2001 FHB.
You'll notice that anything written about installing any type of masonry veneer over wood framing calls for a 1" - 2" air gap behind.
Most manufacturers have specific installation requirements in order to warranty the same. Cultured Stone, for example, requires felt, lathe and then a type "N" mortar. I honestly wouldn't take the advice of anyone here on this board and would look up the technical installation instructions with your particular produce. Most, however, will probably say building felt I suspect.Regards, Scooter"I may be drunk, but you're crazy, and I'll be sober tomorrow." WC Fields, "Its a Gift" 1934
An open drainage plane is not called for with this type application
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Thanks; I stand corrected. I went back to look at the JLC article. I would emphacize the need for weep holes, though, which I haven't seen mentioned here.
JLC is the Journal of Light Construction, probably a better tedchnical trade journal than FHB is. They have an online presence athttp://forums.jlconline.comTo post photos and to share your puictures with friends via e-amil, you need to learn to use your photo editor to make them a manageable size. Something no more than a tenth of what you have.You probably have that capability but you could also downlaod Irfanview for an easy one.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
There is a great article in Dec. 2004 JLC on proper methods for installing CS.
My mason just installed some for me. 30# felt, diamond lath, scratch coat, stone, grout. Beautiful.
I would not consider a reinforced film wrap a substitute for the 30# felt, in this application.
On the other hand, lookit all the guys who have been switched over to using these reinforced lightweight films for roofing underlayment! Rooftop Guard II, etc.
Maybe someone needs to do laboratory testing.
How about a membrane like ice & water shield or perhaps EDPM. Seems like a good application for something less permeable than a house wrap.
Edited 9/22/2005 7:54 pm ET by csnow