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Flashing Membrane on Fence Posts

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Topic by Dukegijoe posted 03-06-2011 04:26 PM 9568 views 1 time favorited 11 replies Add to Favorites Watch
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Dukegijoe

4 posts in 3372 days

03-06-2011 04:26 PM

Topic tags/keywords: fence concrete pressure treated

First, I’m actually a regular visitor of Lumberjocks rather than homerefurbers, but I am about to start on a fence and came across an idea I thought was interesting and wanted the opinions of some hard core diyers. There is a lot of conversations on the web about whether or not to set your posts in concrete. 1 recommendation I read was to place roofing membrane around the posts before placing the posts in the ground. My question: Worth the extra time or not? And is it better in concrete than in dirt, or visa versa?

As always, thanks in advance.



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allmyfingers

31 posts in 3094 days

03-06-2011 04:58 PM

we used to use concrete for all our posts. now we use a mixture of coarse gravel and stone dust. 4-6” in the bottom, then add the mix in 5” lifts, tamp down with 2×4 and continue till you are 3-4” from the top. then mortar mix on the top to fill and crown for run off. the gravel locks in tight and drains well. it only gets firmer over time. the problem with concrete has always been shrinkage of the post, which will allow movement and water creeping in, which will then freeze/thaw and weaken the concrete.

-- caring costs nothing

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Dukegijoe

4 posts in 3372 days

03-06-2011 11:38 PM

Intersting… do you know what the composition was? How many parts coarse gravel to stone dust? It makes a lot of sense, since it would allow for better drainage around the post. Thank you.

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allmyfingers

31 posts in 3094 days

03-06-2011 11:52 PM

we go around 3-4 parts gravel to one part stone dust. we also use landscape fabric around the perimeter of the hole in wet environments to prevent any infiltration.

-- caring costs nothing

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ParraGarage

1 post in 442 days

06-02-2018 02:04 AM

Interesting discussion – was looking for ideas/clarification on a new fence I am building as a DIY’er and this has helped. Seems it may not be worth the extra time and effort to use a flashing type arrangement. Just stick with what I have always done. Thanks for the input.

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