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Thread: Attaching 4x4 posts to concrete

  1. #16
    DIY Member chrisexv6's Avatar
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    I would get an old circ saw with a masonry blade and cut room for the posts in the slab. Drop the posts in with some sort of base molding and it will cover up the concrete edge (caulk it before you put the molding down).

    Previous poster was correct in that your posts surface mounted on concrete are gonna start to wobble eventually. I look at my mailbox post (which is actually concreted into the ground about 1.5' down) and after several years its started to move around.

  2. #17
    Retired Defense Industry Engineer jadnashua's Avatar
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    Wood will expand and contract with the seasons and the rain. Eventually, that is likely to crack the concrete. Had you considered embedding a steel post in the concrete, then boring a hole in the wood post and then setting it over the steel post? You could drill a hole through the post and pipe and then anchor it with a screw through it.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #18
    DIY Hillbilly Southern Man's Avatar
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    As long as it's at least 12" or so away from the edge or near a control joint the post wont crack the concrete.

  4. #19
    DIY Senior Member gardner's Avatar
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    Don't embed posts in your slab, use these:

    http://www.strongtie.com/products/connectors/CBQ.asp

    When your post (inevitably) rots away, you can replace it without messing with the slab.

  5. #20
    DIY Hillbilly Southern Man's Avatar
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    Quote Originally Posted by gardner View Post
    Don't embed posts in your slab, use these:

    http://www.strongtie.com/products/connectors/CBQ.asp

    When your post (inevitably) rots away, you can replace it without messing with the slab.
    From your link:
    Post bases do not provide adequate resistance to prevent members from rotating about the base and therefore are not recommended for non top-supported installations (such as fences or unbraced carports).

  6. #21
    Master Plumber Redwood's Avatar
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    Quote Originally Posted by Southern Man View Post
    And I know more than what the layman assumes a civil engineer does.
    The wind blew n the BS flew n I couldn't see for an hour or two...

    From what I see you don't know doo-daa squat about plumbing and probably are a fairly poor civil engineer...
    Probably the reason why roads flood and washout, rock slides and mud slides, dam failures and bridge collapses occurr...

    The layman looks at the hillside and says I dunno looks pretty steep...
    See how the dirt washed down the hill by that light rain last night...
    I'd hate to see it in a heay rain with saturated soil...

    The engineer says...
    Oh it will be fine one the vegitation takes hold. Soil samples say it is very stable soil and test borings indicate great subsurface drainage... Blah blah blah...

    Yep us laymen get to drive around the detour after the hill slides down across the road.
    Damn engineers they screw everything up...
    Last edited by Redwood; 11-14-2008 at 03:57 PM.

  7. #22
    DIY Member Hillbilly Man's Avatar
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    I'm still mad at Southern Man.
    He helped me cobble up my front stoop an about a month later the damn thing collapsed.
    Kilt 2 of my best dawgs when she let go.
    I thunk twas a little shakey but he said twas alright.
    How was I two know... He's a civil en-gin-ear...
    Hillbilly Eng-in-ear
    Moonshine Maker
    Dumb as a Stump

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