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PostPosted: Sat Jul 07, 2018 12:39 pm 
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I need to buy a piece of plasterboard but are they exact sizes when they say 9.5 or 12.5.


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PostPosted: Sat Jul 07, 2018 12:44 pm 
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I am not sure I get the question. The two numbers are the thickness of plasterboard and they go back to imperial sizes hence in 0.5mm. If your existing plasterboard has been skimmed it will be thicker.


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PostPosted: Sat Jul 07, 2018 12:46 pm 
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yes +/- 1mm - Knauf boards has finer tolerances iirc, by the time you skim it or fill it its not noticeable


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PostPosted: Sat Jul 07, 2018 9:07 pm 
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OchAye wrote:
I am not sure I get the question.


There is very little difference in the price between the two, in fact 12.5mm is often cheaper than 9.5mm, per 8x4 sheet. (About six quid plus vat, £7.20?)

My builder ALWAYS uses 12.5, presumably as it is stronger, heavier, spans distances between bearers better, etc.,etc.

9.5 feels flimsy in comparison.


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PostPosted: Sun Jul 08, 2018 8:27 am 
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OchAye wrote:
I am not sure I get the question. The two numbers are the thickness of plasterboard and they go back to imperial sizes hence in 0.5mm. If your existing plasterboard has been skimmed it will be thicker.
I'm thinking of replacing a piece of 11mm plywood on a cupboard with plasterboard but 12.5mm will be to thick. I also need to patch a hole in a plasterboard wall but im not sure what thickness I will need at the moment but it looks around 11mm thick. The plasterboard wall is over 12 years old so I didn't know what thickness plasterboard they used years ago.


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PostPosted: Sun Jul 08, 2018 8:52 am 
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9.5mm and skim it or if you don't want to skim it pack it out, you can get small sheets of PB in 6x3' (1220x900) for about £4-5 a sheet

A straight edge and a Stanley knife, cut it in half and it will fit in any car (if you haven't cut PB before, score the board, tap the back and slice the fold)

https://youtu.be/5Fgl0MV1gLE?t=55s


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