Raised decking on uneven and wet ground

Question

My garden where I want decking is uneven and gets a bit soggy in heavy rain 

Would I be able to fit support posts with postcrete 700mm down? Would this be sufficient or would the wet ground be too much?

Mark · Accepted Answer

Depends really on the ground. Going up 700mm is not a problem but would recommend 4” posts. If the posts sit on a concrete pad 300mm square and 150mm deep. Filled to ground level at your highest point. This would support your decking and keep your posts out of the water to reduce rot.

Thomas · Answer

Personally, I would use a bolt down post holder and fill the 700mm post hole with concrete, this would add extra weight. Another way to do it is to put the bolt down post holders onto 600x900x90 council slabs with 100mm of mot 1 hardcore underneath, this would act like a bigfoot and it would spread the weight.

Hope this helps 👍

Ryan · Answer

Yes this would be fine to do allow a full bag of postcrete per post

Stephen · Answer

If the ground is that wet, it'd be better to go a metre, use concrete and backfill with gravel to help with drainage

Simon · Answer

Yes in most cases.me I would be more likely to be 900mm

Chris · Answer

if your using timber posts id treat with bitumen paint to protect and make sure to over fill the post holes

Raised decking on uneven and wet ground

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