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

[MitchellMc]

So, initially, if you can, it would be best to relocate it at least 100mm in from the edge of a sheet @MartinM. If that's not possible, then you can get away with having the penetration on the joint, but by having the holes there, the concern is that the tongue is no longer supporting the joint. To get around this, you can box up around the penetrations so the joint is supported on both sides. These timbers obviously need to be tied back into the floor joist with a structural connection. I've created the below rendering for you to illustrate.

Mitchell