Decking on concrete on a slant

broody · 22 Jul 2019

Decking, I need to build 6m x 4m decking, however the concrete patio it's going on is slanted from the level it needs to be from 3inches one end to 8inches the other, using 4x2 joists won't work due to the 3inch depth, what are my options? (no I can't remove concrete base)
Thank you

Ian H · 23 Jul 2019

Have it an inch higher or use 3x2 in that area?

modeno65 · 23 Jul 2019

I've just built a deck in my garden using 4 x 2 joists BUT at one end I have a concrete path that reduces the joist to 3 x 2. I made sure the timber was well treated as it will be resting on the ground at that point. One point to note is the support distances for the joists will change if the joist is smaller. I used the 3x2 until i could fit the 4x2 and bolted them all together with a support post. Then put my weight on it to check. It worked for me
Good luck

broody · 23 Jul 2019

modeno65 said:
I've just built a deck in my garden using 4 x 2 joists BUT at one end I have a concrete path that reduces the joist to 3 x 2. I made sure the timber was well treated as it will be resting on the ground at that point. One point to note is the support distances for the joists will change if the joist is smaller. I used the 3x2 until i could fit the 4x2 and bolted them all together with a support post. Then put my weight on it to check. It worked for me
Good luck

Brilliant, sounds like my situation. So at the 3x2 end, are the joists resting on the concrete or bits of slabs for water run off? How did you raise the frame off the ground on the concrete?

modeno65 · 23 Jul 2019

The end of the joist is sitting. on a very thin bit of tile - basically to give it the desired height - also to keep it off the ground.

My previous deck sat directly on the path. Wood was still ok after a good few years but didnt have a lot of water flow.

Raising the frame. In a few areas I sank posts in to the ground as it was above earth. I was given some of these
https://www.amazon.co.uk/StrataRise...9Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

and they support the joists. Alternatively I suppose bricks/slabs will do they same job.

You can get metal post feet that can be bolted to your slab and then hold a support post that will be bolted to your frame.

https://www.amazon.co.uk/Fixman-376...rds=post+feet&qid=1563882377&s=gateway&sr=8-4

Just work out the best / cost effective way for what you need

broody · 23 Jul 2019

modeno65 said:
Just work out the best / cost effective way for what you need

Great ideas, thanks

conny · 23 Jul 2019

If you are putting support posts on the right hand side you will obviously need to cut the bottom edge at an angle to get them vertical. You won't be able to do this if you use post plates as they will fall to the angle of the concrete. It may be possible to cut the support at an angle and then stand it on a piece of slate to achieve the vertical.

broody · 24 Jul 2019

conny said:
If you are putting support posts on the right hand side you will obviously need to cut the bottom edge at an angle to get them vertical. You won't be able to do this if you use post plates as they will fall to the angle of the concrete. It may be possible to cut the support at an angle and then stand it on a piece of slate to achieve the vertical.

That's a good point, using wooden posts cut to the angle of the concrete would work.

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Decking on concrete on a slant

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