Plasterboard moving/flexing

[sigma]

Marmox board, dot and dabbed onto brick, there's some flex at the edges where the board is a)slightly warped and b) where I clearly didn't put enough adhesive.

The movement is very small (maybe 1-2mm?) and it's not the whole board (board is solid) but it's on a single edge, over a 20cm-ish span but there is movement and in a place that's going to be tiled, and also it's in a shower cubicle.

There shouldn't be any movement should there? Especially given it's going to be tiled and in a shower enclosure.

I think the answer is to rip it down and start again? With a load of adhesive around the perimeter.

Side note - Marmox fitting instructions are not to be trusted, there's no way 5 dots would be sufficient!

 

[robj20]

Drill hole and inject some expanding foam board adhesive.

 

[sigma]

Drill hole and inject some expanding foam board adhesive.

Ah, I forgot about that stuff! Genius!

 

[sigma]

Drill hole and inject some expanding foam board adhesive.

Soudal Adhesive Foam Hand-Held 750ml - Screwfix

Order online at Screwfix.com. Suitable for use as an adhesive. Ideal for fixing large sheet materials, or as an expanding filler for large holes, gaps and cavities. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

This stuff?

 

[robj20]

Not sure the difference but this one is specifically plasterboard adhesive and cheaper. But yes. I haven't used it before I still prefer full plastered walls rather than boarding.

Soudal Genius Gun Plasterboard Adhesive PU Foam Hand-Held 750ml - Screwfix

Order online at Screwfix.com. A fast-curing polyurethane adhesive, perfect for bonding plasterboard panels to walls. Ready to use without mixing, which saves time and effort. Ideal alternative to traditional mortar-based adhesives. Specially designed trigger mechanism for precise application and...

www.screwfix.com

 

[Buffman]

It will probably be alright when you put adhesive on, but yes could use idea above.

 

[sigma]

Foam worked a treat @robj20 ! Probably could have gotten away with it as it was but it's solid as a rock now plus I got to shoot some foam, which was fun. Ended up going the whole hog and buying a proper gun.

 

[Deleted User 298457]

Foam worked a treat @robj20 ! Probably could have gotten away with it as it was but it's solid as a rock now plus I got to shoot some foam, which was fun. Ended up going the whole hog and buying a proper gun.

How dare you...........one must struggle with the all-in-one units for several years before giving up and buying a gun. It is a total game changer.

Make sure to buy the gun-wash.

 

[Hagar]

How dare you...........one must struggle with the all-in-one units for several years before giving up and buying a gun. It is a total game changer.

Make sure to buy the gun-wash.

And a holster.

 

[sigma]

How dare you...........one must struggle with the all-in-one units for several years before giving up and buying a gun. It is a total game changer.

Make sure to buy the gun-wash.

I must admit it was partly your reaction to getting one that made me think twice about the can job. I do think a can would have been OK for my use this time but I think I have a couple of other jobs that will need it so the gun made sense.

I have the gun wash... this also works well on hands not that I had to use much but I didn't wear gloves when checking to see if my practice splodge had dried.

The foam doesn't half expand

The screwfix gun comes with a plastic tube to fit on the end of the nozzle which is very handy!