Replacing chipboard floor for tiling advise

[Old Mod]

Not digging me out yet you ignored Boggs’ reply suggesting chipboard is laid first and then overborded.

Why would I lay ply and overboard it? Because that’s something I’ve done before many tines and very rarely see 22mm cement boards. Maybe I’ll look into this further. Thanks for the information.

Also Boggs suggested that there might not be a joist under the stud wall if the joists run parallel with Said wall. That has nothing to do with cutting up to the stud wall. My apologies if I misunderstood why you mentioned that.

Haha Andy, honestly I was not ranting at you, you have my word.
I expect the first comment got me brooding about it.
I don’t publically berate members. (Often ) I do it in private.
I was just being a bit expressive about my feelings on the subject.
I truly apologise if you felt I was being personal, I wasn’t.
And anyway if I was digging you out, I’d of said so.

Believe me there are many guys here that would do exactly the same as you, it just baffles me as to why.
It’s a shame you can’t get hardiefloor anymore, brilliant product.
Sorry Andy.

 

[Waluigi]

It does raise an interesting point though and honestly not something I had considered.

I bet if we fast forward ten years someone might be ranted at for rebuilding a room yet not replacing the timber joists with the new cement resin joists that would be available in 2028....

 

[tony Dimartino]

It does raise an interesting point though and honestly not something I had considered.

I bet if we fast forward ten years someone might be ranted at for rebuilding a room yet not replacing the timber joists with the new cement resin joists that would be available in 2028....

I totally agree, I last tiled 12 years ago anfdthen I put ply down sealed it and tiled, TBF it never cracked or moved in 12 years. But things have come on so much its a complete minefield !!!

 

[Perfect Tiling]

One thing you will need to be aware of is the weight of your tiles. No matter how many studs and dwangs you put into the wall if you go down the plasterboard route it will only take a maximum weight of 32kg.....thats for everything. Allow around 4kg for cement adhesive which you'll need as they're porcelain and that leaves 28kg for your tiles. I carry a set of bathroom scales as some of these tiles are so damn heavy. Topps regent 9mm tiles are right on the limit at 27kg a box of 6 (1.08 sq mtrs). 12mm HB 0r Marmox style boards will take well in excess of this.

 

[Boggs]

Not digging me out yet you ignored Boggs’ reply suggesting chipboard is laid first and then overborded.

Why would I lay ply and overboard it? Because that’s something I’ve done before many tines and very rarely see 22mm cement boards. Maybe I’ll look into this further. Thanks for the information.

Also Boggs suggested that there might not be a joist under the stud wall if the joists run parallel with Said wall. That has nothing to do with cutting up to the stud wall. My apologies if I misunderstood why you mentioned that.

Using 6mm Hardie over new chipboard is what I would usually do, never had a problem but we all do things differently.

When I do a job I take into consideration how and what damage it might cause when it has to be removed.
22mm t&g No More Ply screwed directly to the joists is a great idea in theory but what damage might it do to joists when it has to be ripped up?
Floors are easy to replace, joists not so.

Joists under walls is a point I make from experience, if everyone cuts back the floors to the nearest 15mm without a joist under to support it the wall may well start to drop with the weight of tiles etc on it. It’s better to cut to the nearest joist inside the bathroom.

 

[Waluigi]

I’ve experienced it many times, Boggs.

In fact, I have taken up many a bedroom carpet to install timber between the joists so that I can take the whole floor up. Amazing how many builders ignore using a double joist under a stud wall in preference of no joist at all.

I still don’t see using ply/chipboard and then over-boarding as wrong necessarily but I do take 3falls point and shall be looking into this method further.

 

[Dumbo]

Using 6mm Hardie over new chipboard is what I would usually do, never had a problem but we all do things differently.

When I do a job I take into consideration how and what damage it might cause when it has to be removed.
22mm t&g No More Ply screwed directly to the joists is a great idea in theory but what damage might it do to joists when it has to be ripped up?
Floors are easy to replace, joists not so.

Joists under walls is a point I make from experience, if everyone cuts back the floors to the nearest 15mm without a joist under to support it the wall may well start to drop with the weight of tiles etc on it. It’s better to cut to the nearest joist inside the bathroom.

I worry more about floor sagging with no support next to walls . Also I don't make jobs to come apart .