Decking using concrete slab supports

5 Aug 2008
Reaction score
West Midlands
United Kingdom

I'm putting together a small 3m x 3.5m low level deck replacing an existing concrete patio. i've lifted the most the slabs and left 9 in place to act as support the joists/frame. My concern is there is quite a bit of contact with the joists and slabs and hence over time the frame could start to rot.

i'm looking at options to slightly elevate the frame above the slabs, including 4'x4' USP structural connecting composite post bases, EasyFix rubber feet joist support system & using a standard bolt post down support and a short 4'x4' decking post.

i'm wondering if these might just be fairly expensive & over complicated options. Would say a 2cm high bit of treated 4x4 decking put underneath the joists at regular intervals, with a bit of damp proofing between that and the joist be sufficient?

I've also noted that some on the forum suggest not bothering with joist hangers and just to use screws for the frame and inner joists. Is there are a reason for this ie. cheaper, easier?

would welcome any comments or ideas.

Sponsored Links
Just put the frame on the concrete. Using a membrane wont help, as water will still sit, plastic or not.
Slabs won't retain water for a long period of time, they will absorb it and soak it away eventually.

No problem at all putting it on concrete slabs as long as you secrue the frame to them.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links