Is this okay to tile over?

[u/samjonseh]

Removed the old tiles from the bathroom ready to retile and it took a large chunk of the plasterboard with it. Is this okay to retile over, or does the plasterboard need replacing?

[u/buffmanuk]

It'll probably be fine, but the best option might be to multitool out the nearest stud then putting a bit of plasterboard either side. Use a tanking kit before tiling if it's in a wet area (near bath)

Here's an example of what I did here: https://www.reddit.com/r/DIYUK/s/MclVaNKjch

[u/samjonseh → u/buffmanuk]

I think this is the option I'm going to go for as it is above a bath. You ever wish you didn't start something on boxing day? 😂

[u/f8rter]

Just seal it with some unibond 5/1 solution. Then some filler. Then seal that when dry. You’ll be fine

[u/samjonseh → u/f8rter]

Sorry if this sounds silly, what is unibond 5/1 solution? Used pva to seal walls before but never in a bathroom / wet area

[u/f8rter → u/samjonseh]

Pva mixed 5/1 with water

You just need to seal it for the filler and adhesive to adhere

[u/Significant_Fail3713]

What do you think? The plaster board has a massive crack into the cavity behind.

[u/samjonseh → u/Significant_Fail3713]

So new plasterboard required?

[u/Outrageous-Play7616]

Is this in a wet area beside the bath?

Personally if you are going to the trouble of redoing the tiles then cut it out up to the height of the tiles and replace with 10mm Jacko board or similar tile backerboard.

The problem with using plasterboard in a wet area (even if moisture resistant) is that water will always get behind the tiles as the grout isn’t waterproof, and will turn the board to mush and your tiles fall off.

The other problem is gypsum in the plasterboard reacts with the cement in powder based adhesive when it gets wet. This creates phosphates and then your tiles fall off. The only way to get around this is to prime it with primer G and then tank it using a tanking system.

[u/seager]

Get rid of it all and cement board where it might be wet.

[u/RGMeek0n]

Do it right or you'll worry about that tile all the time.

[u/HotSpotPleaseItch]

I work for a housing developer and have seen a lot of plasterboard with the face ripped off / loss of integrity, retiled and do just fine.

That being said, it depends on the size and/or where the tile falls as to whether I’d replace the PB.

[u/jwflame]

The broken edges need to have support behind them, you can't just leave them loose like that.

Tiling over plasterboard is very far from ideal anyway.

[u/Illustrious_Low_6086]

That's exactly what tiles are for