Plastering adhesive

[Stephen]

Can you use plastering adhesive like a filler, or do you need something like sandstone cement.

A bit in relation to my other tiling post.

Basically removed some tiles form around the bath and a lot of plasterboard decided to join them.

Theres a gap of about 3 inches to fill. I was just thinking if I can buy a bag of something mix it up and fill the big gap and and then tile it ?

just not sure what to use to fill the deep-ish area. The chap in wickes said just buy a bag of plastering adhesive, and straight edge, and mix it up and "slap it on" and just drag a straight edge over the lot and leave it to dry over the weekend ? as its a lot of filler being used not normally used in that level of thickness so longer drying time needed or said put it on about

1.5 inches-ish at a time and let it dry and build it up to surface level ?

What do you think I should do ?

[Stuart Noble]

I think you should postpone the tiling.

[Stephen]

How do you think I should proceed from here Stuart ?

Maybe buy a bag of plaster and build the layers up slowly ?

Advice welcomed as obviously :) I'm out of my knowledge depth, but ready and willing to have a go :)

[Cicero]

================================================

Buy a bag of 'Onecoat' plaster from Wickes. It's cheap, easy to use and lasts in the bag for months.

Cic.

[Tim W]

Stephen wibbled on Friday 15 January 2010 18:46

I did mention "One Coat" (Wickes sell it). You can slap this on from 15-20mm (in smaller bits, larger areas might need 2 coats due to sag) down to quite thin and it's a perfectly good substrate to tile directly to.

PVA everything (try the Plastering WIKI) with dilute PVA a day or more before. PVA again an hour or two before you start plastering (dilute but less than the first time) and slap the One Coat on (which you can mix in bucket with wooden spoon if you really have to for small amounts - or use a drill whisk for larger amounts.

The PVA will stabilise the crap you have, and the 2nd coat of PVA will help the plaster to get a bond to the crap so it doesn't drop off later.

Use a basic metal float to apply and finish - don;t need anything fancy as you don't care about the finish. In fact it's worth dragging a damp sponge over the top lightly when it's just gone off to give a better key for the tile adhesive, but this is optional.

[The Natural Philosopher]

he's not wrong., but for speed, use carlite bonding plaster (rock hard in a couple of hours), and stuff the hole with newspaper first.

No comment. Its too tempting...

>

[Stuart Noble]

If the existing board is fixed to timber studs and you've gone right through it, you'll have to replace it. If it's just the odd hole you could plaster as suggested. I don't know who's doing your tiling but fixing to plasterboard is a hell of a lot quicker than uneven plaster, and you'll get a better job.

[Stephen]

Hehe I think I have over stayed my welcomed and have got annoying.

[Tim W]

Stuart Noble wibbled on Friday 15 January 2010 19:26

Didn't he mention brick - or have I got confused (wouldn't be the first time..)

I still think PB is less than ideal behind wet tiles. I agree with your sentiments that flat = easy tiling though...

[Tim W]

Stephen wibbled on Friday 15 January 2010 19:38

Not in the slightest.

You know when that happens because at least three people will ask you to solve the following anagram:

cuk foff

So as long as you're not an Islamist evangelist or a Spammer, you'll be fine ;->

It gets mad here sometimes...

Welcome, BTW, if this is your first time here :)

[John Rumm]

Not sure what plastering adhesive is. Plasterboard adhesive, could be used as a filler at a pinch, but there are better choices.

Any chance you could photograph the wall in its current state so that we can see what you are dealing with?

For under tiles, you can get away with putting it on thick. You may get surface cracks as it dries, but you don't care if tiling over.

[David WE Roberts]

Nobody so far has mentioned sand and cement (can be bought in small bags for a couple of quid ready mixed - just add water).

A lot of bathrooms are rendered from new when they are going to be tiled - quicker and cheaper than plastering - and you are not looking for a smooth finish to paint or wallpaper.

It all depends on the size of hole you are trying to fill.

Small and shallow holes can be filled with any general purpose filler, as already discussed.

Deeper holes are more of a problem when filling with plaster or similar; you have to part fill then wait for the filler to harden before you put on another layer. You can normally fill deeper holes with sand/cement in one go. However this is not magic - just a coarser mix which will fill slightly deeper. For really big holes you would need two layers of sand/cement or fill most of the hole with sand/cement then finish off with a thin layer of plaster or filler.

As posted already, if it is plasterboard that has fallen out then one option is to fill in with plasterboard but as you only need a bit there will be a lot of wastage.

One potential problem - if you do really have plasterboard and not plaster then the surrounding plasterboard is going to get damp when you fill the hole. You need to be very sure that it is dry and sound before you tile over it or you are likely to have problems in the future.

The advice to postpone your tiling until you are sure you have a sound base seems good.

Cheers

Dave R