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Old 08-26-2010, 09:30 PM   #1
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Bituthene


Does this stuff breathe? It's real damp in NoCal in the winter. The bottom 4 feet of 2 moldy rooms are gutted through to the outside. The contractor wants to use bituthene over the studs, then the plywood, then metal siding. Had water damage from deck splashback & flashing that was not well thought out. What about bituthene over the plywood & then the metal?
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Old 08-28-2010, 04:52 AM   #2
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Bituthene


its used because it does NOT breathe,,, if i read this post correctly, i'd be using it over the plywood sheathing underneath the siding,,, primarily you need to think about removing the wtr source - atmospheric moisture's never going to be resolved because that's your climate,,, liquid or condensing water can be fixed

think of it this way - the stuff's just like ice/water shield & that doesn't get placed under your roof's sheathing, does it ? no, its under the shingles ( just like siding )
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if you hear it from a guy in the apron store, be VERY suspicious the mtl/method will work,,, when it time to build something together, they won't answer phones NOR help
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Last edited by itsreallyconc; 08-28-2010 at 04:54 AM.
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Old 08-28-2010, 08:33 AM   #3
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Bituthene


Here is a link for bituthene from Grace Corporation that makes several waterproofing products. Hope the info is helpful.
http://www.metrowaterproofing.com/documents/BIT3000.PDF
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Old 08-28-2010, 01:30 PM   #4
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Bituthene


IT is right, you want to stop water penetration from working it's way to the sheathing.
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Old 08-29-2010, 01:59 PM   #5
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Bituthene


Thanks. I did think that if it went anywhere it should be protecting the sheathing not protecting the wall cavity should the sheathing get wet. I painted the outside of the sheathing & will then add the metal over furring strips. No bituthene - want it to breathe. Not taking all of the sheathing off so got 2" L-shaped flashing & bent it flatter to form a 'roof' where the old meets the new. (Just had to remove the bottom 3 or 4 feet that was moldy due to splashback from the deck...& other misallignment issues with the outside wall.)
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Old 08-29-2010, 07:10 PM   #6
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Bituthene


just to be certain, the bituthane should be installed OVER the sheathing then siding added on top of it,,, use z-flashing to protect the top of the siding mtl.

paint isn't a good weather protector for sheathing ever.
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