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Hes been really good to be fair - felt like he was trying his best to get it passed the structural engineers. Either way..... its going ahead now. Thanks to all who helped on this thread. Just gotta do it now... and work out how to insulate it.

Can u put a velux on the front of your roof? Are there any planning restrictions with it going on the front face of a gable roof?

A result. The Building Control Officer has agreed it...... provided the apex of the ceiling doesn't exceed 3.36 meters and the ceiling is strapped to the gable wall in addition to the roof line.

The problem i have is that the wall is built to wall plate level and this was a very late in the day idea. It is only viable if its simply a case of using scissor trusses over finks. Anything more complex, and I'm going to scrap the idea.

Not sure.. ill measure later, but they are well within those shown in document A

I'm with Godwas on this one. My house is identical and its preservation fluid.

Spoke to BCO again today..... to be fair to him, he is trying to agree it. The issues comes from the fact that structural engineers use British Standards...... which are much more restrictive. Document A gives much more flexibility. He said building control are kind of stuck in the middle...

Thanks again. I'm gonna try and speak to him again tomorrow.

I wonder if raised tie roof trusses could be used? I've had a reply from a designer who reckons its to do with 'bracing' the gable wall and thats why scissor trusses can't be used without a windpost. I cant find any mention in document A about bracing...... just restraint.

Thanks Derek..... The point that I don't get is that the reason I cant just use scissor trusses is due to lateral restraint of the gable wall at the ceiling height. But from my reading, it appears that restraint at the ceiling level is ONLY required when the height between the 1st floor...

Yeah.... doc A shows how gable walls are tied to roof. Basically, the roof is strapped up its slope to 1 bent straps that are built into the gable wall. But there is no requirement for restraint straps at ceiling level unless the height from 1st floor level to ceiling level is greater than 16...

Had inspector round on Friday to check some stuff on my extension. He noticed that some of the wall ties were angled down and inwards from the outer leaf to the inner leaf. He said it might allow damp to cross. I've been around a few sites over the last couple of years and I've seen the way...

He isn't..... what he said was that the maximum floor to ceiling height is 2.7 m. His contention is down to the gable wall being restrained to the trusses. He believes that the maximum height between the first floor joists and the rafters is 2.7m because this is where the gable wall will be...

So..... I've been looking into this a bit further and was wondering if anyone could assist my understanding of the following diagram..... which is from approved document A and I believe is what the building inspector is referring to..... At part A it details the requirements for extra...

Just thought I'd put an update on this. My builder and my mate who's a private building inspector (previously worked for Trafford Council) both said its fine for me to just use scissor trusses in place of fink trusses because the truss company have produced the calcs and they're happy. But the...

One thing to note about mine was the inspector commented on the use of cable ties around the insulation. He stopped short of asking me to remove them, but said he'd prefer loose tape - which i also did. Op overkill.

Wickes. They're 7 quid each. 110mm waste adapter. I used Armaflex 19mm thick self sealing insulation. https://www.screwfix.com/p/floplast-waste-adapator-32-50mm/51416?tc=PB2&ds_kid=92700055281954505&ds_rl=1249404&gclsrc=ds&gclsrc=ds This is where is enters a clay pioe that descends outwards

When I initially looked at it - being that its just a 3 sided box thats joining the existing gable wall - I thought surely i could just use scissor trusses instead of standard fink trusses - the idea being that the trusses are designed appropriately to be substitutes for standard finks. On that...

Oh bloody'ell.... sack that then. It was only a possibility if I could have just used scissor trusses rather than fink trusses.

I'm part way through a 2 storey extension. The first floor is gonna be a bedroom and dressing room/en suite. Its basically a 4 meter wide by 7 meter long rectangle room that I'm gonna divide up with stud work. I'm considering a vaulted ceiling....I've not ordered any trusses yet. How much...