Plasterboard question

[cooperphilip]

I need to get foil backed plaster boards for my loft. What I want to know is can you get foil back plaster boards with tapered edges so I dont have to get the boards to land on a rafter ?

Or I have put Kingspan insulation in and that has the shinny foil on the back. Will this act as a vapour barrier and I can just get the standard tapered edge plasterboard ?

Any help appreciated.

 

[cooperphilip]

Forget question I am sorted now.

 

[Richard C]

You can get 12.5mm Duplex boards in both square & taper edge but you should never butt join the plasterboard anywhere other than down the centre of a joist; just taping & filling the joint won’t hold it together or stop it cracking. You should still use Duplex even though the Kingspan insulation is foil backed; are you having it plaster skimmed afterwards?

If it’s a loft conversion? Be aware that even though you no longer need Planning Permission, what you are doing must still comply with relevant building regulations regarding insulation, fire, safe access & escape & any electrical work done up there.

 

[Richard C]

Too late

 

[njkmr]

And I thought I was impatient !!!!!

 

[^woody^]

...so I dont have to get the boards to land on a rafter ?

No board will let you do that

 

[cooperphilip]

Whats the purpose of the tapered edge then I though it was the same principle as with for eg the t ng edge loft boards. You did not have to get them to land on a joist ?

I now I am wrong just want to understand the purpose of the taper edge. Is it so you dont have to use scrim tape ?

 

[noseall]

Whats the purpose of the tapered edge then?

it is so that the joints can be taped and filled without the need to skim the whole board.

 

[cooperphilip]

I see so you can just paint directly onto the board. So if I am plaster boarding my rafters and I get the joint to land on a rafter. Do I just fill it or do I have to tape as well.

Don understand how you can tape if you are going to paint directly onto the board ?

Just trying to understand. Appreciate your advice

 

[stuart45]

Once the joint is taped, more filler is trowelled over the top. This fills the tapered area flush with the rest of the board. This is the normal way for houses in the States, but I would prefer to skim the walls.

 

[cooperphilip]

Would you say you can see a difference in the finish with a skim ?

 

[stuart45]

In a good job you won't see the joints. However emusion sometimes dries slightly different over the joints.