Decking Frame Over Concrete Patio Help Needed


Postby dt_diy » Thu Aug 25, 2016 2:51 pm

Hi guys,
DIYer here looking to build my first deck and desperately need some advice!....

I have a concrete patio that I want to deck over.
The problem is, the concrete, while sound and stable, is only 135mm below the patio door sill, so I don't have enough room to use 6x2 joists.
I thought I could use 4x2 joists (actually 97mm x 45mm) and 28mm deck boards and pack the joists up off the concrete 10mm to allow water to drain.
I'd fasten the joists to the concrete using either 7.5 x 150mm concrete screws going straight through the joist, or attaching some angle brackets to each side of the joist and screwing to the floor that way.
Is this a good idea? Call me lazy, but I really don't fancy ripping up the patio so I can use 6x2s :)

If using 4x2s in this situation is ok, how often would I need to pack the joist up to prevent bowing and bouncing? Every 300mm or can I get away with wider gaps?

Thnaks for your help
Damian
dt_diy
Rank: Labourer
Progress to next rank:
0%
Posts: 1
Joined: Thu Aug 25, 2016 9:35 am

Sponsor

Simply Build It

Postby welsh brickie » Fri Aug 26, 2016 7:39 pm

you can place them at 400mm centres
welsh brickie
Rank: Project Manager
Posts: 2596
Joined: Sat Apr 12, 2008 7:54 am

Display posts from previous
Sort by
Order by



  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!



 


  • Related Topics