Deck footings direct on slab

[Dylan T]

Hi all - realise I’ve been posting a bit about a deck I’m about to start (have been clearing all weekend) and really appreciate all the help so far. Massively helpful community. When ripping up old deck I found way more concrete underneath than I expected, and there’s a huge slab I’m able to use for some footings to save me digging. So I’m wondering whats the recommended method is for putting posts on the slab to stop rot. One option is to drill down into the slab and resin in post brackets like these - but im wondering if that’s overkill for an existing slab and if you could just put them on a plastic shim to avoid contact with wet concrete and then just an angle bracket to avoid movement? Or another method? Thanks!!!

 

[SpaceWorm]

You are correct in wanting to keep the posts off the floor and away from ponding water. Just Google decking post bracket and there are loads of options. Anything that keeps the post off the ground and is galvanised or painted will be fine. The plastic shims will eventually slip from underneath the posts.

 

[John D v2.0]

Resin sounds unnecessary how about bedding bricks or equivalent on some mortar?

 

[^woody^]

Just staple some DPC to the underside of the timber, don't wrap it though.

Tanalised timber (green) can be immersed in water for long periods with no problems. Other treatments (typically brown) are not so resistant.

 

[Dereekoo]

This is my decking put down 13 years ago straight onto slabs still standing and no rot, as long as its constantly not standing in water or moist soil it will survive

 

[bernardgreen]

Free standing on a piece of lead sheet. Trim the lead to the exact size of the post. ( the photo was taken before the trimming was finished )

The lead seals the end grain of the timber. This was done 40 years ago and the timber which was Tanalised and coated with Sadolin Classis is still in good condition