Tips on reviewing roof truss design

[joe90]

4 minutes ago, epsilonGreedy said:

archived paperwork stored in attics that concern him the most.

hence my tongue in cheek 

 

2 hours ago, joe90 said:

40 years worth of beano comics ?

 

[MortarThePoint]

'archived paperwork' - we're having a log burner for that

[epsilonGreedy]

12 hours ago, MortarThePoint said:

'archived paperwork' - we're having a log burner for that

 

I tried that before = lots of ash for little heat output!

[MortarThePoint]

If your trusses are to come in two deliveries, get lists of which trusses are to be in each delivery. Don't just rely on a confirmed request, get the actual truss codes coming on the first lorry. You want the girder trusses on the first delivery.

[MortarThePoint]

Get a drawing that shows the trimmer sizes and ideally the designer can generate the cut list for the infill timbers. The carpenter won't necessarily follow the cut list and the truss company will include extra provision for this, but it is useful to see.

 

Double check the chimneys, >50mm clearance to all combustible materials. Check this on site as trusses are installed.

[passivhybrid]

if you still have a chance look at energy heel trusses

 

https://www.norbord.com/na/blog/raising-the-roof-raised-heel-trusses/

 

raised heel truss

Edited December 2, 2020 by passivhybrid
added link

[Oz07]

3 hours ago, passivhybrid said:

if you still have a chance look at energy heel trusses

 

https://www.norbord.com/na/blog/raising-the-roof-raised-heel-trusses/

 

raised heel truss

 

[PeterW]

On 29/11/2020 at 10:42, MortarThePoint said:

Double check the chimneys, >50mm clearance to all combustible materials. Check this on site as trusses are installed.

Liner systems aren’t included in this - the block work and vermiculite see to that. If you have twin wall it has to be clear of the trusses. 

[MortarThePoint]

13 hours ago, PeterW said:

Liner systems aren’t included in this - the block work and vermiculite see to that. If you have twin wall it has to be clear of the trusses. 

 

So does that mean if you have Isokern pumice liner and leca infill like I do you can have trusses very close to the chimney's brickwork? That would be good as otherwise I have to solve a small truss that has gone in at 45mm from the outer skin of the chimney. (my chimney is 175mm Isokern, minimum 95mm Leca, blockwork, cavity, brickwork)

[PeterW]

Yes - check the regs, it’s all in there.