07:35AM | 07/09/04
Member Since: 07/08/04
8 lifetime posts
I have a problem with the T-111 Siding on my Mountain House Rotting on the lower 4' of the house, in areas where there is minimal sunlight. The house is 20 yrs. old, and there has not been Rain Gutters on the home since it was built. The rain water from the roof is draining directly onto the back deck, and subsequently laying there. That, combined with the lack of sunlight, is creating my problem. I am installing gutters and replacing the T-111, however, I am wondering if I should place some type of "House-wrap" under the T-111 to protect Studs from the moisture?????? Please advise.




10:07AM | 07/09/04
Member Since: 07/01/03
549 lifetime posts
You definitely need to put an infiltration barrier like Tyvek or asphalt felt behind the new T-111 siding. Also it is critical that you use Z-bar flashing that runs unter the siding above and over the new siding. This makes the horizontal seam water tight.

As far as the deck is concerned, if the siding runs under the ledger board that supports the deck, I suspect that the siding is rotted there as well. It may be necessary to pull the deck away from the house it that is the case. I have done this, and it can be done without dismantling the deck. The deck ledger board needs to be flashed to pull that water away from the siding. Gutters would help, but you may need to consider snow and ice problems.


11:55AM | 07/12/04
Member Since: 07/08/04
8 lifetime posts
Thanks for your response, Tomh. My thinking was pretty much in line with your comments. I will most likely use Tri-Flex synthetic roofing underlayment under the new T-111.

Thanks again!


12:54PM | 07/12/04
Member Since: 07/01/03
549 lifetime posts
The Tri Flex product is too much of a good thing. You want a product that sheds water but allows water vapor to be transmitted. a #15 asphalt felt or spunbonded polyester (like Tyvek) is fine, but you are putting a water proof, vapor proof barrier on the outside. Probably not a good idea as it will hold all moisture in the wall. Use something more permeable.


03:21PM | 09/13/04
Member Since: 09/12/04
1 lifetime posts

I am having exactly the problem you described with the siding rotted under the ledger board of my deck, which is off the second story of my house.

Additionally, the ledger board is pulling away from the house.

Any suggestions on repairing this?
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