Advice needed: Attach plastic shims to joists?

[ex_directory]

For my outside decking have joists sitting on slabs. Need some spacers to get peefect fall and height. What is the best way to stick plastic spacers to underside of the joists so they don't move over time?

Could gaffer tape them but guessing that could detiorate.

 

[gregers]

gripfil or the likes.

 

[ex_directory]

I thought gripfill went britle after a certain time outside though?

 

[foxhole]

You should not need spacers the joists should be hung off the cross timber to the correct height to give a fall.

 

[ex_directory]

I am following this deck building guide which is simple, no concrete needing to be mixed plus I handily had 12 council sized concrete slabs I needed to use up...

http://www.homebase.co.uk/en/static/how-to-build-a-deck

 

[rsgaz]

A couple of galvanised brad nails through each one? It's only to stop them sliding out from expansion and contraction of the timber, right?

Gaz

 

[ex_directory]

Gaz,
Could do but that means lifting up the frames rather than just sliding some shims under with some sticky stuff!

Maybe your idea is just safer in long run.