Build Up Internal Walls

BarneyMc

My joists sit about 4-5 inches higher than my 1st floor internal walls and rest on the external walls only. Under the joists I plan on attaching my airtight membrane and then a 2 inch insulated slab.

This means the internal walls will be 2-3 inches lower than the slab. What's the best way to build up the walls - 'soapbars'?

4Sticks

BarneyMc wrote: »

My joists sit about 4-5 inches higher than my 1st floor internal walls and rest on the external walls only. Under the joists I plan on attaching my airtight membrane and then a 2 inch insulated slab.

This means the internal walls will be 2-3 inches lower than the slab. What's the best way to build up the walls - 'soapbars'?

Make sure your structural engineer is satisfied that the walls have adequate head restraint

BarneyMc

4Sticks wrote: »

Make sure your structural engineer is satisfied that the walls have adequate head restraint

What's that?

Johnnyhpipe

BarneyMc wrote: »

What's that?

Jasus...

Johnnyhpipe

Johnnyhpipe wrote: »

Jasus...

Ok...sorry.. Generally speaking the walls need to be laterally restrained at their head in most cases to provide adequate resistance to internal wind loads/horizontal loads (BS6399) as well as meeting robustness requirements and ensuring an overall durable junction that wont crack the finishes.

Personally - typically I would be looking for a timber bearer/wallplate adequately fixed/strapped where necessary. But of course this varies from wall to wall and project to project.

Is this a support point for the designed roof structure? Wind uplift requirements..?

4Sticks

Also be satisfied that sound will not transfer too readiliy between rooms seperated by these walls.

BarneyMc

Johnnyhpipe wrote: »

Ok...sorry.. Generally speaking the walls need to be laterally restrained at their head in most cases to provide adequate resistance to internal wind loads/horizontal loads (BS6399) as well as meeting robustness requirements and ensuring an overall durable junction that wont crack the finishes.

Personally - typically I would be looking for a timber bearer/wallplate adequately fixed/strapped where necessary. But of course this varies from wall to wall and project to project.

Is this a support point for the designed roof structure? Wind uplift requirements..?

Apology accepted, I've 2 degrees but neither in engineering.

OK, if this really is a structural issue then I'll leave it at that as I know we can't discuss on this forum. I'm talking about the internal (inside walls) on the first floor, none of which have any strapping (unlike the outside/perimeter walls) or support the roof.

So just to be clear, do these internal walls need to be 'laterally restrained'?

BryanF

Just to be clear, your eng/arch needs to see this.