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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:33 pm 
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Have you tried arguing with a BI recently?


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:43 pm 
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No need to argue with a building inspector, they are good as gold, especially when you work with them on a day to day basis and inevitably they are there to help.

He didn't specify what you have fitted though, he is just there to check it.

Your architect would have specified what you have used, and I have never heard of 100mm solid insulation below a rafter, that's why I was asking.

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:46 pm 
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ashleywood.ash wrote:
Have you tried arguing with a BI recently?



Can't say I have... Normally they are quite reasonable and don't need argueing with. I'm wondering if there was a "misunderstanding" somewhere ?

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:47 pm 
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The building inspector is either talking pish or you've misunderstood what's required.
What we do is 120 between rafters and 25mm insulated plasterboard over rafters(vapour barrier required on rafters)
I've been in this game a long time and have never,ever seen 100mm kingspan fixed over rafters then plasterboard over the top. This is why your boarding is such a mess and it'll pop/fall off eventually.
They aren't drywall screws you've used either.


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:51 pm 
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Well I don't know what to suggest as that's what I was told to do.
It was not possible to fit more than 50mm between rafters due to needing 25mm air gap and 75mm rafters.


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:54 pm 
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steviejoiner74 wrote:
They aren't drywall screws you've used either.


And there are a lot of missed studs and a lot of joints with no screws on both sides of the joint..... Looks like a take it down and start again number, especially considering the board is 4 inches off the timber...

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:04 pm 
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So
How do I get 100 mm insulation between rafters where there is only space for 50mm?


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:06 pm 
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What does it show on the drawings?

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:07 pm 
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ashleywood.ash wrote:
Well I don't know what to suggest as that's what I was told to do.
It was not possible to fit more than 50mm between rafters due to needing 25mm air gap and 75mm rafters.


Can only take a guess as to what was expected by B/C Buttttt.... I'd imagine they wanted the "Rafters" extending by XYZ(50/70mm ish) then the insulation... then the plasterboard ? I could be wrong because I can't see what is under the PB that you have fitted ??

Edit.. Handyman in sussex posted whilst I was typing.

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:12 pm 
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What I have done:

Existing 3x2 rafters behind 9x2 purlins with felt and tiles roof
Existing rafters are to be doubled using c24 3x2 behind the purlin (side by side) 50mm insulation between rafters 100mm below rafters total 150mm.

This is what it says.

The only other way I can think around it is to add a further 3x2 on the face of rafter (obviously not behind purlin) and fit 100mm between and 50mm below.
But this is a lot of wood and extra weight and is not what it says


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:14 pm 
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I suggested extending rafters on front by 75mm but BI said no as not behind purlin and therefore not weight bearing. SE agreed hence side by side

Obviously the ideal would be remove roof fit new 6x2 rafters and re-tile roof but that's and entire new roof


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:21 pm 
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Add 50mm x 50mm with timberlocks or similar @ 400mm centres under your existing 75mm rafter to give you 125mm solid timber.

Fit 100mm celotex between the rafters, which will maintain 25mm air gap, then the vapour barrier below, then 40mm celotex over the top. This should satisfy BCO as we have just done one recently to this spec. 40mm below rafters is still a pain to use but nothing like what you have just done.

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:24 pm 
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Ok I'll look at that. BI won't know as he has been out and seen already so that ok.
That is a lot to undo. Below the purlins is built in wardrobes so completely out of sight. Should I just replace above purlin?


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:28 pm 
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ashleywood.ash wrote:
Below the purlins is built in wardrobes so completely out of sight. Should I just replace above purlin?


That's your call really, especially if it's your house, but we work for clients and don't want a comeback so I would change the lot.

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:35 pm 
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It is virtually starting again from scratch as all stud walls are up etc and all would need to be removed to do what you suggest.
Yes it is my house.

I am concerned when you said it will pop and drop. Can this be prevented with more screws?


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