What material to use for new bathroom subfloor

[Garen]

Hi Team,

Im replacing a subfloor in my bathroom and getting conflicting info in what i should be using. Ill list my project below

• 1950s house with floorboards and on stumps.
• Have removed the floorboards and repaired the joists etc
• Need to add new sub floor to get it ready for new floor covering, thinking vinyl, probs not going to be tiles.

Questions I have

• What subfloor am i using to begin with? Plywood, cement sheeting, yellow tongue? Have had lots of conflicting information.
• Do i need to lay another layer over the intial subfloor? Been told to use ply or cement sheeting for this, and also not needed. Been told this is for strength.
• After this theres water proofing and final covering, probs vinyl in my case. Is this correct?

Im getting trades to do some of this, but will do evrything I can myself.

I would love some help with this please! Any other information and tips would be great.

Thanks

[chriscam82]

fiber cement sheeting is your best bet for any wet area its just very very heavy so prepare to have someone help 

then you will need to

waterproof 

lay screed 

waterproof again 

then tile 

[MitchellMc]

Welcome to the Bunnings Workshop community @Garen. It's brilliant to have you join us, and many thanks for your question about bathroom subfloors.

As @chriscam82 mentioned, the standard modern approach would be to use Hardie's Secura compressed cement flooring. It will be laid directly onto the existing joists, though some changes/additions might be needed to accommodate them. Here's the installation guide.

You could use Hybrid Vinyl in non-wet areas, though vinyl sheeting is not an approved flooring for a bathroom.

Here's another useful guide: How to plan a bathroom renovation.

Please let us know if you have any questions.

Mitchell