Sealing T1-11 siding to slab foundation?

rogerv_gwFebruary 1, 2007

We've been having a problem with ants coming into our house using the space between bottom of the T1-11 siding and the slab foundation where the siding overlaps the slab foundation. The siding does not sit flush with the concrete, so there are gaps.

My question is, should the T1-11 siding be sealed to the foundation? If so, how would this be done, and what would you use to do it?

Thanks.

-Roger

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PRO
Brushworks Spectacular Finishes

The starter strip should not be sealed. If sealed, it will prevent needed ventilation. If sealed, you'll notice moisture damage in the future.

Michael

    Bookmark   February 1, 2007 at 9:01PM
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rogerv_gw

Michael,

I'm not sure what a starter strip is, but the implication is that if one seals the bottom of the T1-11 flashing to the outside of the cement slab foundation, that since water (be it condensation or siding leakage that would normally flow down the vapor barrier) cannot drain out then there will be water damage?

Is this about what you're saying? This does make sense, and is why I asked.

Thanks.

-Roger

    Bookmark   February 1, 2007 at 11:15PM
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HandyMac

If there is a vapor barrier under the T1-11, that would be the case. A better reason is that the T1-11 should not be touching the concrete at all---for the same reason. Moisture damage to the wood from the moisture in the concrete. Current building codes specify only pressure treated wood should be in contact with concrete.

The ant problem would not be cured by sealing the T1-11 anyways---it is almost impossible to seal them little critters out. We use bait hotels and I spray the trails with Deep Woods Off---lasts a long time and is not as dangerous to pets/grandkids as poisons.

    Bookmark   February 2, 2007 at 12:16AM
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mightyanvil

Is there a vapor barrier behind the T1-11? Do you live in a hot climate?

    Bookmark   February 2, 2007 at 8:19AM
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brickeyee

"Current building codes specify only pressure treated wood should be in contact with concrete."

Most codes only require PT if the wood-cement contact is less than a stated distance from grade.
8 inches and 12 inches are common numbers, but ask your AHJ.

    Bookmark   February 2, 2007 at 9:45AM
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mikie_gw

If its in contact with concrete it should have metal flashing separating it... ask your manufacturers, or see their guarantees.

    Bookmark   February 2, 2007 at 10:43AM
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rogerv_gw

Okay, yes, there is a vapor barrier under the siding. No, T1-11 siding is not pressure treated. And if I were to seal it, which doesn't sound advisible, I would not use wood, so the sealant (whatever that might be) would be in contact with the wood and the cement. This would not change the present wood to cement contact. There might be flashing under the siding where it contacts the concrete foundation, I don't know at this point.

Thanks.

-Roger

    Bookmark   February 2, 2007 at 5:20PM
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