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-   -   posts and concrete (http://www.diychatroom.com/f19/posts-concrete-71038/)

raddelacruz 05-11-2010 10:30 PM

posts and concrete
 
trying to build a gazebo and need to probably bury the posts so as to keep the gazebo from moving or blowing over. Would you recomend pressure treated lumber or cedar posts or would you use some kind of brackets bolted to the concrete. Please help

Houston_Bldr 05-11-2010 10:45 PM

It's going to be stronger if it's set in wet concrete. Use cuts of a sonotube to extend the concrete out of the soil, so that the end of the wood does not sit in water when it rains. Finish the top of the concrete with a slight slope away from the post.

The metal brackets are fine too, but the anchor bolt should be set in wet concrete or epoxyed in. Don't use the tap in anchor bolts without epoxy.

Just Bill 05-12-2010 05:59 AM

PT warps and checks like crazy, I would prefer a top grade cedar. Pour supports as suggested above, but mount posts on top with Simpson or similar hardware(no wood in concrete or touching dirt). VERY careful measurements are required!!!!

Willie T 05-12-2010 08:38 AM

1 Attachment(s)
Sinking posts in concrete is never a good idea, period. No 'If's', "And's", or "But's" about it.

If you are fortunate enough for the soil you're in to be of a type that helps drain the rain and ground water away from your posts, no concrete involved, you're in the minority. Thank someone for looking out for you.

For the rest of us, if we absolutely HAVE to sink a post down in concrete, try to do it the way shown here.

The base of gravel lets the water that seeps and soaks down between the post and the surrounding concrete run off below. But your post MUST be firmly planted into the gravel a few inches to create an unsealed pathway to the gravel base. If any concrete gets under the post, it will encase the post in a concrete 'death tomb' where rot will eventually eat your posts away. In such a case, it would have just been a waste of time putting that gravel down there.

slickgt1 05-12-2010 10:48 AM

Quote:

Originally Posted by Willie T (Post 440794)
Sinking posts in concrete is never a good idea, period. No 'If's', "And's", or "But's" about it.

If you are fortunate enough for the soil you're in to be of a type that helps drain the rain and ground water away from your posts, no concrete involved, you're in the minority. Thank someone for looking out for you.

For the rest of us, if we absolutely HAVE to sink a post down in concrete, try to do it the way shown here.

The base of gravel lets the water that seeps and soaks down between the post and the surrounding concrete run off below. But your post MUST be firmly planted into the gravel a few inches to create an unsealed pathway to the gravel base. If any concrete gets under the post, it will encase the post in a concrete 'death tomb' where rot will eventually eat your posts away. In such a case, it would have just been a waste of time putting that gravel down there.

I have also seen people wrap the bottom of the post, the part that goes into the concrete, with roofing felt. But yea, I'm with you. I would never put a post into concrete if I could get around it. I would set brackets in concrete, and put the post on that. If you need to change them 10 years from now, you won't have as much of a hard time as if it was set in concrete.


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