I am renovating an 1870s house in MA and started by gutting a small
bedroom on the 2nd floor. After insulating, I plan to install blueboard
with veneer plaster. I have read DIY books, Building codes and these
discussion groups but I cant figure out whether I need 5/8" or 1/2"
blueboard. I guess it depends on local building codes and where the
room is located, but I am wondering what the rule of thumb is? 1/2"
blueboard is readily available, while I would need to go to a
commercial dealer to get 5/8". Which brings up another
question....does 1/2" blueboard/sheetrock plus the 1/8" veneer count as
the 5/8? Any thoughts would be appreciated.
Where I live 5/8 is used on both sides of a wall for a fire wall. Like
between the garage and the home.
1/2 is used for all other applications. Unless your local authority has a
requirement for "blue board" I would only use it when it was near water or
high humidity, like the kitchen or bathroom.
No half inch with a coat of plaster is not considered 5/8 where I live.
Best check with the building gurus where you live.
Your post doesn't indicate why you think you need 5/8". 1/2" should suffice.
Also, here's an excellent primer about wallboard(s) and the reason why
blueboard *should* be used for your veneer.
Thanks for that. Scratching around in the back of my mind was a vague
recollection that 5/8 rock is required on ceilings. Last time I had
need for that was over 30 years ago. I see I was right but that there
is a 1/2" product that is a 5/8 equivalent.
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