Another decking thread.

21 May 2018
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United Kingdom
New member here. Signed up for some general information regarding a deck

Bought my first home and sorted the majority of the inside renovation and now I’ve started the jobs in the garden.

Right at the back of the garden I have a lovely sun trap which currently has concrete slabs and a few ordinary paving slabs attached to it in a type of “U” shape. However this is an incredibly ugly eyesore (however the slabs are all solid and all level)

I would like to build a deck over these patio slabs but I have a few concerns.

My deck would be around 2.5metre squared. And I would like it to sit only slightly higher than the patio slabs so <150mm including deck boards. I don’t have a problem building the base but despite using pressure treated wood can this be laid directly on weed control membrane above the concrete slabs? I don’t fancy excavating the entire area to use concrete posts and feel this is slightly overkill for a 2.5 mSQ Deck? Or shall I use small spacers between the concrete slabs and the timber? I was thinking of using either 2x2 or 2x4 tanalised timber for the base frame.

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You could recycle the slabs you have, or get some used roof slates and place between membrane and the underside of the bearers.

Why do you need a membrane if you are laying the deck directly on top of the slabs? I’m soon going to be doing the same but with a much bigger deck. Just going to have the posts/base sitting directly on the concrete slabs.

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