Steel Ridge beam to rafter connection details

[OldSpot]

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.

 

 

[LiamJones]

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?!

[nod]

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 

[SBMS]

  On 22/08/2024 at 19:33, 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?!

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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?

[Temp]

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, 2024 by Temp

[JamesP]

 This is a detail from our vaulted ceiling. As specified by Structural Engineer.

 

[OldSpot]

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, 2024 by OldSpot

[Mike]

  On 28/08/2024 at 15:02, 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

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Yes, that's a variation of what @markc suggested in your other thread on the topic: