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The Water Cooler
General Discussion
Lumber rated for subterranean use?
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<blockquote data-quote="dennishoddy" data-source="post: 3390349" data-attributes="member: 5412"><p>Built my 20’X20’ deck about 30 years ago. Still solid as a rock with direct burial of 4X4 treated posts 3’ deep in concrete. </p><p>A building contractor gave us some tips that appear to work. His advice was to seal the 4X4 in roofing tar being especially heavy on the end grain. The tar extends a couple of inches above the concrete line. </p><p>Another critical issue is to make sure the concrete is domed on top so water runs away from the 4X4’s. After the concrete sets, use RTV sealer around the post so water can’t run inside if the concrete pulls away from the post. </p><p>Almost 30 years later we can still see the roofing tar line above the concrete and the posts are solid. We taped it off before applying the tar so there would be a cut line and not be an eyesore.</p></blockquote><p></p>
[QUOTE="dennishoddy, post: 3390349, member: 5412"] Built my 20’X20’ deck about 30 years ago. Still solid as a rock with direct burial of 4X4 treated posts 3’ deep in concrete. A building contractor gave us some tips that appear to work. His advice was to seal the 4X4 in roofing tar being especially heavy on the end grain. The tar extends a couple of inches above the concrete line. Another critical issue is to make sure the concrete is domed on top so water runs away from the 4X4’s. After the concrete sets, use RTV sealer around the post so water can’t run inside if the concrete pulls away from the post. Almost 30 years later we can still see the roofing tar line above the concrete and the posts are solid. We taped it off before applying the tar so there would be a cut line and not be an eyesore. [/QUOTE]
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The Water Cooler
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Lumber rated for subterranean use?
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