Wet area base flooring

[ptyltd]

Hi Folks,
<O:p</O:p

Am building an extension that includes a laundry and an ensuite and was wondering what you would recommend to use for the base flooring. When I renovated the main bathroom basically the only thing I left was the T&G which I then put 6mm Tile underlay over before putting down tiles. For the two new areas I hadn’t planned to use my good Ironbark T&G as a base before doing the same but was going to use some 12mm Particle board and then put the 6mm Tile underlay over that to bring the floors level before putting tiles on top however as I now have spare (albeit a lot of rubbish which doesn’t matter) T&G I thought I would ask your opinions. Do I :-
<O:p
1.) Use spare T&G (19mm) as base flooring with the 6mm tile underlay over that (as per the main bathroom).<O:p</O:p
2.) Go with the 12mm particle board option with 6mm tile underlay over that?<O:p</O:p
3.) Use solid 18mm compressed sheeting <O:p</O:p
<O:p</O:p

Are all the options as good as one another (so should I just look at cost)? Or is there a preferred method I should adhere to? Thanks in advance folks and I look forward to seeing what you think J<O:p</O:p

[echnidna]

don't use pb, if the floor ever gets flooded or moisture gets into the pb over time it will swell up and stuff your floor.

[Gaza]

if joists are at 450cc uses 15mm CFC, timber not a good idea in wet area,.

[ptyltd]

Yeah 450crs. The inlaw had recommended solid sheeting and the only thing that had put me off was the cost. The only thing that put me off using the spare T&G was the thought of cutting and then hand drilling/nailing any more (just finsihed 50m2 of T&G and then there was 30m2 of deck just before that so I am so over drilling/nailing for now :D ). I notice that there is a specific wet area particleboard so do I assume that stuff is ok (and can you tile directly on it?)? As my other half informs me don't scrimp now (re: solid sheeting costs) to save pennies that could result in costly repairs in the future :o . Only reason I had considered particleboard was I thought most bulding sites I had seen the wetareas had a particleboard like flooring put down first (but maybe that was just as a working platform etc.).

Thanks for the comments

[ian]

I notice that there is a specific wet area particleboard so do I assume that stuff is ok (and can you tile directly on it?)? As my other half informs me don't scrimp now (re: solid sheeting costs) to save pennies that could result in costly repairs in the future :o . Only reason I had considered particleboard was I thought most bulding sites I had seen the wetareas had a particleboard like flooring put down first (but maybe that was just as a working platform etc.).Fibre cement sheeting is the go.

[OBBob]

Hi There, I have done both the full thickness fibre cement sheet and the particle board with tiles directly on top. If you want a really solid floor go for the fibre cement but remember it is really heavy on your own, expensive and has no t&g.

You can tile directly on chipboard but you must have the correct adhesive and sand it back and then prime it prior to putting down the tiles. I have just done a room like this due to little other choice ... so far its good but we will have to wait to see if it stands the test of time (previous posts suggest it doesn't compare to FC).

[ptyltd]

Thanks for the replies folks. Looks like I will do it with the compressed sheeting.

[silentC]

Your entire wet area floor has to be waterproofed (well in NSW it does) so a lot of people just go over chipboard flooring now. I prefered not to and put cement sheet down. It's a bugger to work with but once it's done it's done and I reckon it's a better job.