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concrete mix for posts

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  • 26-08-2007 2:17pm
    #1
    northdublin
    Closed Accounts Posts: 459 ✭✭


    replacing and existing panel fence and yesterday dug out the holes and erected the posts with a concrete mix. i asked advice about the mix of a few friends and relatives. some told me 8parts gravel ti 1part cement, others told me to just lash loads of cement into the mix with gravel, the more the better.
    i decided to go with roughly 7/8 parts gravel to one part cement with a few small bolders thrown down into the mix and all compacted in. checked the post this morning and all seem solid enough. was i right in the mix i used and is it of benefit to wrap the posts in dpm before putting them into the concrete or could this cause them to loosen over time


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    #2
    311
    Closed Accounts Posts: 5,332 ✭✭✭311


    It's six to one .

    But ,I think the more cement you use the quicker it sets. If it sets too quickly it can crack.


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    #3
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    northdublin wrote:
    replacing and existing panel fence and yesterday dug out the holes and erected the posts with a concrete mix. i asked advice about the mix of a few friends and relatives. some told me 8parts gravel ti 1part cement, others told me to just lash loads of cement into the mix with gravel, the more the better.
    i decided to go with roughly 7/8 parts gravel to one part cement with a few small bolders thrown down into the mix and all compacted in. checked the post this morning and all seem solid enough. was i right in the mix i used and is it of benefit to wrap the posts in dpm before putting them into the concrete or could this cause them to loosen over time
    7 or 8 to one is fine: just keep the surface of the concrete moist/wet for a few days to help the curing

    I dont see how the dpm will cause a problem: i presume the posts are pressure treated timber?


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