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Old 10-29-2008, 01:16 PM   #1
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seal base of deck post


Any reason not to seal the base around the deck post resting on a concrete pad?

Asphalt moisture barrier already exists but I thought some silicone sealant around the base of the post would increase protection against moisture damage .

haven't seen this done and was wondering "why not'

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Old 10-29-2008, 01:24 PM   #2
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seal base of deck post


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Any reason not to seal the base around the deck post resting on a concrete pad?

Asphalt moisture barrier already exists but I thought some silicone sealant around the base of the post would increase protection against moisture damage .

haven't seen this done and was wondering "why not'
the deck posts should be in some type of post teco? this way its fastened to the footing and allows the post to stand off the ground so water don't get to the bottom of the post.BOB

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Old 10-30-2008, 10:37 AM   #3
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seal base of deck post


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the deck posts should be in some type of post teco? this way its fastened to the footing and allows the post to stand off the ground so water don't get to the bottom of the post.BOB
that's not my question....

My question is "why not add sealant around the base of the post" ?
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Old 10-30-2008, 01:02 PM   #4
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that's not my question....

My question is "why not add sealant around the base of the post" ?
I know what your question is!!!!!! why would you want to seal the post to the concrete???? answer that question and we will be able to help. BOB
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Old 10-30-2008, 09:03 PM   #5
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seal base of deck post


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that's not my question....

My question is "why not add sealant around the base of the post" ?
Because you will just aid the "trapping of moisture" in that post-base area, which will accelerate rot.
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Old 10-31-2008, 12:00 PM   #6
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Because you will just aid the "trapping of moisture" in that post-base area, which will accelerate rot.
if the post is on asphalt shingles and then sealant is around the base of the post, how would moisture get under the post to be trapped ?

I would think the sealant would keep the moisture out
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Old 10-31-2008, 12:01 PM   #7
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I know what your question is!!!!!! why would you want to seal the post to the concrete???? answer that question and we will be able to help. BOB
Actually, the post is on asphalt shingles, so the seal would be at the contact of the post to the shingles.
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Old 10-31-2008, 01:15 PM   #8
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seal base of deck post


Because concrete is porous and contains it's own percentage of moisture.
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Old 11-02-2008, 02:20 PM   #9
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Because concrete is porous and contains it's own percentage of moisture.

So, since the post is on asphalt shingles, the seal in combination with the moisture-barrier shingles will keep the post permanently dry.
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Old 11-02-2008, 04:20 PM   #10
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seal base of deck post


I would have to think the roof would fail way before the post rotting. what I mean about the roof! is that being the post is directly on the asphalt shingles the shingle will stay damp under the post and would fail way before its time in the area of the posts. I could be wrong but this is what came to mind. unless the posts are flashed correctly according to its application. BOB
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Old 11-03-2008, 12:33 PM   #11
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I would have to think the roof would fail way before the post rotting. what I mean about the roof! is that being the post is directly on the asphalt shingles the shingle will stay damp under the post and would fail way before its time in the area of the posts. I could be wrong but this is what came to mind. unless the posts are flashed correctly according to its application. BOB
The post is not in contact with the roof, its shingles, or in a situation where flashing is required ...

The post is on a concrete pad with asphalt shingles between the post and concrete. The shingles serve as a moisture barrier to the post.
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Old 11-03-2008, 05:11 PM   #12
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The post is not in contact with the roof, its shingles, or in a situation where flashing is required ...

The post is on a concrete pad with asphalt shingles between the post and concrete. The shingles serve as a moisture barrier to the post.
It is not a true moisture barrier. The reason is because: if the post is exposed to the elements, then water will pool up "on" (on top of) the asphalt shingle, and cause the wood (sitting on top of it) to decay over time.

As stated earlier in the thread, the proper installation for posts on concrete, is to use a galvanized "post base bracket". There are several kinds. I suggest the use of a stand-off type, which raises the post above the concrete, and any water.

Use of such a post bracket also serves as a means to properly "mechanically fasten" , a structural post to concrete.

Examples: http://www.strongtie.com/products/co...ba-abe-abu.asp
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Old 11-04-2008, 04:54 AM   #13
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yes that is correct! thanks Atlantic for the clarification. BOB
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Old 11-04-2008, 10:42 AM   #14
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It is not a true moisture barrier. The reason is because: if the post is exposed to the elements, then water will pool up "on" (on top of) the asphalt shingle, and cause the wood (sitting on top of it) to decay over time.
yes, there is a two part problem, and the sealant, between the shingle and the post will resolve the "water on top" problem.

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