Joists on top of existing wall

N

NTHigh

New Member
Hi I am upgrading the ceiling joists in my bungalow. They currently sit unattached on top of the wall plate i.e. there are no joist hangers and they are on top of the wall plate. Previously they only supported the ceiling plasterboard. I want a structural floor. I plan to use 150 by 47 C24 timber at 400 centres but cannot figure out the correct way to attach the new timbers.
Joist hangers would reduce the ceiling height. Is there an alternative ?
Thanks
Here is photo of the current joists sitting on the timber wall plate
 

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truss clips or cleats?. Or as used to do and fix through the sides and into the plate. Have you had the new floor detail calculated and specified as fixing detail should show on drawing . Span, loading etc
 
They would normally just sit on the plate but with a plywood pack to just lift them clear of the existing ceiling.

You have no ceiling to load so just sit them. You may need to clip the top corner to clear the tiles and get full bearing.

6s are pretty small for loft floors!
 
OP,
Until you post the joist span, and the expected load then its foolish to guess the joist section size.
There are joist calculation tables on google.
Your existing joist tails are correctly skew nailed into the wall plate - nail heads can be seen - they should also have been fixed to the rafter tails.
Use screws for fixing the new joist tails.
 
Thanks. The sown is only 2.8m. The tables I checked confirmed the joists I had been quoted. Thanks for the suggestions.
 
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