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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:36 pm 
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You need 50mm air gap.
I can't understand what you've been told to do by the bco or by the architect,it doesn't conform to the regs and I've certainly never seen it done the way you've been told.
Do you have a copy of the drawings passed by the council you could post on here?


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:40 pm 
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Has the roof bituminous felt or a modern breathable membrane?


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:44 pm 
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I'll find them out.
Sorry it is 50mm the 75mm rafters are faced with 25mm


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:45 pm 
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Bitumen felt


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:50 pm 
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I will look at seeing if I can work around the stud walls as it obviously won't drop where they are.
I will have to use 50mm below rafters as BC say 150mm


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:52 pm 
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And I'll use 75mm timber below current rafters to give 50mm air gap. Will 100mm timberlock screws suffice giving a penetration of 25mm? Or 120mm?

And 90mm drywall screw for plasterboard and 50mm kingspan?


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 9:02 pm 
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ashleywood.ash wrote:
Bitumen felt


You 100% need minimum 50mm airflow then.


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 9:03 pm 
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Yes I forgot to add the side by side rafters are faced with 4x1 to gained the extra required 25mm


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 9:06 pm 
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Confused now and lost it sorry! Stevie can you carry on please

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 9:09 pm 
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Mate don't take this the wrong way but you sound like you don't really have a clue what you are doing.
You say you've just noticed this and that but have done it all the wrong way anyway??
Have you actually got planning permission or building consent to do this as I've ALWAYS had to double up roof rafters if the insulation and airgap aren't achievable with current rafters and the way you've done things currently reeks of amateurism at best,sorry for sounding harsh but this is just my professional observation.


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 9:12 pm 
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Yes I have planning permission, building regs and SE calcs all done.

Ok
Thank you for your time I will sort it.

I understand what you suggest I do. I don't see how I have done something massively wrong through following the drawings and instructions.
It is possible as there is. 50mm air gap

I will remove the plasterboard and insulation. Remove the 4x1 and replace with 3x2 on face so I can get 100mm between whilst keeping a 50mm air gap.
I'll then put 50mm below rafters, vapour barrier and plasterboard.


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 Post subject: Re: Taping and filling
PostPosted: Sat Apr 29, 2017 10:25 am 
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wine~o wrote:
ashleywood.ash wrote:
My building inspector,

I had to do 50mm between rafters and 100mm below rafters. He insisted on this and would not let me do it the other way around


Summat not right there ??


50mm between the rafters with a 25mm air gap, then 100mm across the face of the rafters.

Sounds ok to me

Not sure I'd want it all hanging on 3x2 though.


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 Post subject: Re: Taping and filling
PostPosted: Sat Apr 29, 2017 10:51 am 
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thescruff wrote:
wine~o wrote:
ashleywood.ash wrote:
My building inspector,

I had to do 50mm between rafters and 100mm below rafters. He insisted on this and would not let me do it the other way around


Summat not right there ??


50mm between the rafters with a 25mm air gap, then 100mm across the face of the rafters.

Sounds ok to me

Not sure I'd want it all hanging on 3x2 though.

You can't have a 25mm air gap with bituminous felt above,you need 50mm minimum scruff.


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 Post subject: Re: Taping and filling
PostPosted: Sat Apr 29, 2017 11:26 am 
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I'm an ex plumber Steve :lol: anyway it might not be bitumin, really old it won't have anything, if the BS is happy it's good enough.

Out of interest why not ?


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 Post subject: Re: Taping and filling
PostPosted: Sat Apr 29, 2017 11:41 am 
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thescruff wrote:
I'm an ex plumber Steve :lol: anyway it might not be bitumin, really old it won't have anything, if the BS is happy it's good enough.

Out of interest why not ?


It has to be breathable felt/membrane that doesn't trap any moisture. The old school stuff doesn't breathe too well.


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