Iam building a suspended wooden floor in an extension, the shortest span is from the existing external wall to the opposing wall. How do i fix the joists into this external wall, what choices do i have ? If i use joist hangers how do i ensure they are fixed securely.
Assuming you don't want to put a bolt completely through the wall so that the nut would be inside the house; then you need to use Projecting Anchor Bolts.
Come on richjacq, do something to help yourself; the first hit from a google search shows you this;
You drill a hole in the wall and insert so that only the bolt on the right (where the nut is) is projecting out of the wall. Fix your joist on the bolt, followed by washer and nut. As you tighten the nut it pulls the conical shaped piece at the other end of the bolt towards it which causes those casing pieces along the length of the bolt (which are in the wall) to be forced open and expand thus fixing the bold firmly into the wall whilst securing the joist to the wall.
Don't know about bolt spacing, joist sizes etc, I would get those from a structural engineer.
Would you then use those fixing bolts shown Masona or does it require anything more substantial, to go through the leaf of the wall and brace from inside the cavity maybe?
What I'm trying to say is how do you normally fix those sleeper beams to a cavity wall?
when i discussed it with the building inspector i sugested placing the joists across the longer span (4.4m) with a sleeper wall in the middle as this would mean easy support of the hangers on the new wall. He said a sleeper wall wouldn't be needed at mid span if i placed the joists the shorter span (3.1m). it was only afterwards i wondered how was the easiest and strongest way of attaching them to the cavity wall. After another discussion with the inspector he said to hang a 75 x 170mm wide joist along the long span and hang the joists off that like jbonding sugested.
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