Building a new attached elevated deck

[alex876]

Hi all,

We had an extension built a couple of months ago, it’s a modular steel frame extension. I want to build an elevated attached deck(to avoid having to dig holes right next to the foundations), 4.8m wide by 2.8m long. My question is what can I use to attach the ledger on the steel frame. The frame is galvanised steel, 4mm thick. With bricks it’s pretty straight forward but with metal it gets a bit complicated. I cannot use bolts and nuts as it’s all done now. Any ideas?

 

[big-all]

it needs to be below 300mm above the natural ground level ajacent to the the decking to avoid the need for planning


dont know the answer to your actual question though

 

[alex876]

Yep, I’m aware of that. It’s gonna be 290mm above ground level.

 

[foxhole]

Screws , make sure it’s not breaching dpc.

 

[alex876]

Would these work? Are these big enough to bear the load?

TechFast Heavy Duty Timber to Steel Roofing Screws | 5.5 x 109mm | Elementech | Bag 50 https://amzn.eu/d/67R8lOb