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 Post subject: Taping and filling
PostPosted: Fri Apr 28, 2017 12:32 am 
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Hi guys
About ready for prepping my plasterboarded loft conversion.
It was very hard to do as it's a double hip roof with dormer so lots of angles and corners.
As the rafters were quite old and there had to be 100mm kingspan under boards it was impossible to get everything totally level so there are uneven areas and gaps due to the angles.

What is the best product and method to prep this before being skimmed?

I have some easi fill is this the best stuff?

Was thinking mesh scrim tape and then easi fill or should I fill some of the larger gaps first, then tape and fill again?

Due to certain uneven areas should I still use edging trims?


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 6:58 am 
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You got any photos mate? Boarding has to be fairly tidy to tape and joint. Otherwise it'll need plastering.


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 8:30 am 
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Any big gaps, use hessian scrim, set with finish plaster, then bond out all dips etc with carlite bonding, before skimming.
Run a straight edge over and mark all low spots for bonding.


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 9:56 am 
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I'll get some photos up.

So hessian for big gaps using finish plaster. I'm guessing fill wil plaster (multi finish) then push the tape in, allow to dry and sand off. For my normal gaps I can use fibre glass scrim and easifill then use carlite to build up the low areas or do you mean do a total undercoat of carlite then finish plaster coat over top?


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 9:58 am 
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I am getting a plaster in it's just he's a mate and busy so trying to save time and money doing prep. He to busy to get here to look


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 11:02 am 
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Photo bucket links removed. Pics attached to thread. Mod 2.

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 6:22 pm 
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That's really rough mate. A pro taper would walk away from that. Screws sticking out which don't even look like drywall screws and gaps and steps galore. It's needing a pro plasterer to make a job of it.



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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 6:23 pm 
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Nothing personal ... some of that work is awful. Looks like you've used the wrong type of screw as well

(I could be wrong, I couldn't wait for photobucket or whatever to open when clicking)

Certainly some of that needs coming off and re-doing..

Even if skimmed over there will be problems with movement down the line.

Edit Stevie posted whist I was typing.

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 6:34 pm 
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Good spread will get over it, you will need a couple of bags of bonding to straighten it up.
Scrim all the joints with hessian first ( cotton will be no good ) .
Change all the screws for drywall screws.


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 6:43 pm 
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They are dry wall screws but 150mm drywall screws as had to go through plasterboard and 100mm kingspan.

I'll get some hessian scrim and base coat the whole thing.

Where can I buy hessian from, I can see it online but do any shops sell it

Is BG thistle bonding from wicked ok for the wide gaps and levelling up? And then tight joints easifill?
These

https://www.ebay.co.uk/itm/361422937637

I appreciate it is not brilliant but it was very hard they are not square rooms and unfortunately I cannot afford to through the money at it that it would cost. Fitting plasterboard is hard enough without all the angles and holding kingdpan behind. I would have been charged a fortune.

Anyway everything can be rectified if you work. I want to make it neat so my plasterer can skim it easy enough. I am happy to do the work and I am quite good with fillers etc and neat I just want to use the best stuff


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:15 pm 
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ashleywood.ash wrote:
They are dry wall screws but 150mm drywall screws as had to go through plasterboard and 100mm kingspan.

I'll get some hessian scrim and base coat the whole thing.

Where can I buy hessian from, I can see it online but do any shops sell it

These

https://www.ebay.co.uk/itm/361422937637



Firstly I would like to refer back to what you said in your first post of this thread: "As the rafters were quite old and there had to be 100mm kingspan under boards it was impossible to get everything totally level"
Considering that and what you said in your last post about using 150mm long dry-wall screws, I am under the impression that you have fixed the 100mm Kingspan on top of all timber, rafters included!
Is this correct?
If we had been talking before you had commenced the work, I would have advised you to cut & fit the Kingspan between the rafters & studs etc. and then board over fixing to all timber with Dry-wall screws of about 32 or 38mm long!
One other point, don't building regs state 125mm thick insulation in loft conversions?

The job is beginning to sound to me like a bit of a fu**up if I'm honest!


Last edited by davyp1 on Fri Apr 28, 2017 7:22 pm, edited 2 times in total.


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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:19 pm 
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Just a question, but who specified 100mm insulation below the rafters? That must have been a PITA to work with and to tack as it shows.

The normal detail we see is 120mm between with 25mm continuous below.

We did finish a job off recently using 40mm below but that was only because the clients had insulated between the rafters themselves and had used 100mm where 120mm had been specified so we had to increase it below.

I wouldn't want to go much thicker than 40mm below the rafters as that was a pain on a skeiling and we were using 90mm screws for it.

100mm kingspan below the rafter doesn't sound right somehow?

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:21 pm 
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Sorry Davyp, looks like you were typing the same thing as me at the same time...!

Is this real?!

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:25 pm 
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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 and yes it was a PITA.

The job is not an F up it has been done to the required building regs, but like I said was difficult and as I said would have cost a fortune.

I guess the reason he would not let me do it the other way around is due to my roof construction. 3x2 rafters supported by purlins on double hip. That gives 50mm between rafters with 25mm air gap. SE required me to double rafter width with c24 which I have done. Could not fit more than 50mm without removing purlins or fitting 7inch rafters both which needed roof off. Building inspect and SE both said this was way to do it and it's 150mm in regs not 125mm


Last edited by ashleywood.ash on Fri Apr 28, 2017 7:32 pm, edited 1 time in total.

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 Post subject: Re: Taping and filling
PostPosted: Fri Apr 28, 2017 7:31 pm 
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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 ??

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