Notching trusses for Lateral restraint straps

[James1]

Building a timber frame garage with attic trusses above, i have a question about the tying of the gable wall and gable panel to the roof trusses. It states i am to use lateral restraint straps spanning across 3 trusses on the rafters and ceiling joists to the gable panel, is it ok to notch the trusses where the strap passes in order to let the strap sit flush so as to not foul the plasterboard when it gets fitted. Hope this makes sense.

Thanks.

[PeterW]

Not if they are engineered trusses. Fit them to the inside or upper surfaces and they are then out of the way or chamfer the back of the plasterboard. 

[Onoff]

Royal patronage for the forum at last! ?

[Simplysimon]

or use these https://www.strongtie.co.uk/products/detail/engineered-restraint-strap/334

[Onoff]

The straps have to tie onto a full block still I assume? Got a very early Part A here circa late 80's.

[Russell griffiths]

I think I’m right in thinking you have hand cut your trusses, so even though you have used the word truss they are not the engineered version direct from a factory. 

 

So if you use those Simpson ties that are very thin I would have no problem cutting a 3mm deep notch

 

but if they are from a factory DO NOT cut or notch any part. 

[James1]

9 hours ago, Onoff said:

The straps have to tie onto a full block still I assume? Got a very early Part A here circa late 80's.

There is no block work. 145x45 timber frame walls with cladding exterior.

[James1]

9 hours ago, PeterW said:

Not if they are engineered trusses. Fit them to the inside or upper surfaces and they are then out of the way or chamfer the back of the plasterboard. 

They are trusses premade from a truss manufacturer.

[James1]

9 hours ago, Simplysimon said:

or use these https://www.strongtie.co.uk/products/detail/engineered-restraint-strap/334

These are a great shout. 1.6mm thich.?

[James1]

Found this statement  on a TRA website. Note 1 Notching the bottom  Chords of ‘Room  in the  Roof’  (Attic)  Trusses to a maximum  depth o 5mm  is permitted in order to accommodate gable lateral restraint straps as  required  b Building Regulations.