Fixing plasterboard to plasterboard

GJO · Post by **GJO** » Tue Feb 23, 2010 10:23 pm

Hi,

Slightly odd question, perhaps, but how would you fix additional layers of plaserboard to a wall that already has plasterboard on it?

I want to add two more layers (9.5mm or 12.5mm), with Green Glue sandwiched in between, to improve sound insulation, but don't know how to fix these additional layers.

The existing layer is 15mm and attached (I think) by dot-and-dab to the brick wall.

Can I just use high-strength grab adhesive for the first layer and screw the second layer to this, or dot-dab over the top?

Any help appreciated!

royaloakcarpentry · Post by **royaloakcarpentry** » Tue Feb 23, 2010 10:33 pm

Green are moisture resistant.

If walls are dot and dabbed then gypline, insulate and overboard in your blue (sound) board.

GJO · Post by **GJO** » Wed Feb 24, 2010 1:04 pm

Thanks, but I'm not sure I understand the reply.

My question was how to fix layers of plasterboard to a wall that already has a layer of 15mm plasterboard on it.

I don't intend to use Soundshield board, as the Green Glue compound is providing the elastic damping effect.

The Green Glue compound is spread between two layers of plasterboard (but, despite the name, it's not an adhesive) so I need to know how to attach this Plasterboard-Green Glue-Plasterboard sandwich to the existing wall.

Ta!

martyn1967 · Post by **martyn1967** » Wed Feb 24, 2010 10:17 pm

Find & mark the Walls stud uprights, slap the green glue on then overboard with 12.5 , use 55mm dry wall screws,
hope this helps.

royaloakcarpentry · Post by **royaloakcarpentry** » Wed Feb 24, 2010 10:20 pm

pmsl....green glue. I responded to overboarding with green and blue boards.

must have been a long day yesterday, sorry.

GJO · Post by **GJO** » Wed Feb 24, 2010 10:26 pm

martyn1967, I don't think there are any studs to screw into. The existing 15mm plasterboard is dot-dabbed to the brick wall.

How about using a grab adhesive for the first board layer, and then using self-drill plasterboard fixings to attach the second layer with GG to this?

http://www.wickes.co.uk/Plasterboard-Se ... urce=123_4

Would that provide a decent fix with good compression?

An alternative, I suppose, is to nail or screw directly into the masonry wall, but I can't see that being easy going!

I really want this to be easy!

Deleted-user-3 · Post by **Deleted-user-3** » Thu Feb 25, 2010 11:01 am

just use thistle board adhesive and dab them on?
if youve got a wall thats miles out and even 3" of dabbng wont pull it back then just dab one layer on, let that dry then dab again over the top..

leebwk · Post by **leebwk** » Thu Feb 25, 2010 12:44 pm

Hi,

If the baseboard is going to be covered in "green Glue" then basically i would drill through the sheets of plasterboard into the masonry and screw and plug using long dri-wall screws

martyn1967 · Post by **martyn1967** » Fri Feb 26, 2010 8:43 pm

Can't remember what they're called but I used some board fixings a long time ago that were made of plastic and were similar to a nail, had to drill holes through the boards 8mm bit 3inch deep and hammer em in. Big heads on em and barnes to stop em coming out!!
Anybody used these before??

martyn1967 · Post by **martyn1967** » Fri Feb 26, 2010 8:45 pm

Barnes means barbs!! Sorry num fingers.

python · Post by **python** » Fri Feb 26, 2010 9:00 pm

martyn1967 wrote:Can't remember what they're called but I used some board fixings a long time ago that were made of plastic and were similar to a nail, had to drill holes through the boards 8mm bit 3inch deep and hammer em in. Big heads on em and barnes to stop em coming out!!
Anybody used these before??

Yes, I used these just before Christmas. They were about £35 a box iirc.

OP, how many boards do you need to fix as I have some fixings left over that would do the job.

python · Post by **python** » Fri Feb 26, 2010 9:08 pm

Like these -

http://images.google.co.uk/imgres?imgur ... s%3Disch:1

martyn1967 · Post by **martyn1967** » Sat Feb 27, 2010 8:40 pm

No they were a 1 piece all plastic oversized nailwith a barbed end and a head about the size of a 2p, not seen em used since late nineties?????

Ted White · Post by **Ted White** » Mon Mar 08, 2010 4:47 pm

GJO wrote:martyn1967, I don't think there are any studs to screw into. The existing 15mm plasterboard is dot-dabbed to the brick wall.

You won't see much success with the current direction.

#1 You can't damp a wall that massive.

#2 Mass Law states that you would need to double the mass of the entire wall to gain 6 STC points (North American standard).

Really all you can do is to frame a new wall in several cm. from the old wall, then insulate and plaser.

This can be debated further, but there is significant lab data to support my assertion.

python · Post by **python** » Mon Mar 08, 2010 6:25 pm

Ted White wrote:
GJO wrote:martyn1967, I don't think there are any studs to screw into. The existing 15mm plasterboard is dot-dabbed to the brick wall.
You won't see much success with the current direction.

#1 You can't damp a wall that massive.

#2 Mass Law states that you would need to double the mass of the entire wall to gain 6 STC points (North American standard).

Really all you can do is to frame a new wall in several cm. from the old wall, then insulate and plaser.

This can be debated further, but there is significant lab data to support my assertion.

wat