OldSpot Posted August 22 Share Posted August 22 Just realised I posted this in the wrong section so re-posting here... I wonder whether anyone could offer any thoughts on this connection detail please? The extension we have has a steel ridge beam to allow a vaulted ceiling. The rafters have been skewed to a 2" timber with what look like your standard nail gun framing nails. The timber has been bolted to the steel i-beam. Make-up is as shown in the picture below. The rafters haven't been birds-mouthed onto the timber but are just as shown. (The horizontal timber shown is a ceiling joist so doesn't extend from wall plate to wall plate and is about a 1.4m down from the ridge. Floor to ceiling is 2.5m) Any thoughts as I'm slightly concerned about the roof loading and restraint onto the steel. Link to comment Share on other sites More sharing options...
LiamJones Posted August 22 Share Posted August 22 Not a structural engineer, but the horizontal timber could be acting as a collar, preventing spread, so maybe nothing to worry about. not really sure why they haven’t just birds mouthed the rafters in though?! Link to comment Share on other sites More sharing options...
nod Posted August 22 Share Posted August 22 I vaulted three cielings on ours and went with what know 8x4 timber ridge Easy to fix to You would be suprised how little weight it actually holds Link to comment Share on other sites More sharing options...
SBMS Posted August 22 Share Posted August 22 1 hour ago, LiamJones said: Not a structural engineer, but the horizontal timber could be acting as a collar, preventing spread, so maybe nothing to worry about. not really sure why they haven’t just birds mouthed the rafters in though?! Is it vaulted if you’ve got a ceiling effectively 1.4m from the ridge? If youve got a steel there anyway could you not get rid of the collar? Link to comment Share on other sites More sharing options...
Temp Posted August 23 Share Posted August 23 (edited) Im not an SE but my understanding is that a ridge beam (as distinct from a ridge board) is intended to support a lot of the weight of the roof when it can't be triangulated to stop the walls being pushed out. The roof partly "hangs" from the beam. To make that work you tie the two rafters together above the beam with metal plates. Google found this image but I would check with your designer. Edited August 23 by Temp Link to comment Share on other sites More sharing options...
JamesP Posted August 23 Share Posted August 23 This is a detail from our vaulted ceiling. As specified by Structural Engineer. Link to comment Share on other sites More sharing options...
OldSpot Posted August 28 Author Share Posted August 28 (edited) Further investigation has revealed this is the standard of construction I'm left to deal with!! That's the rafters siting on the ridge beam Having done a bit more research, I came across this suggested solution from an engineering forum: bearing on top of steel ridge beam Edited August 28 by OldSpot Link to comment Share on other sites More sharing options...
Mike Posted August 28 Share Posted August 28 3 hours ago, OldSpot said: Having done a bit more research, I came across this suggested solution from an engineering forum: bearing on top of steel ridge beam Yes, that's a variation of what @markc suggested in your other thread on the topic: Link to comment Share on other sites More sharing options...
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