Bathroom Tanking

Tester46

I am at the stage of finishing my upstairs bathroom. There is plywood on the floor. My plan is to put down floorboards over the ply and paint the floorboards.

Does this sound right, or have I got it in the wrong order (from the joists up):

1. Plywood
2. Underlay (5mm acoustic insulation)
3. Oak t&g floorboards
4. Paint on tanking (like this one)
5. Two coats of floor paint

Should the tanking go directly onto the plywood? If it goes on the floorboards, can I paint over it?

Joey the lips

Tester46 wrote: »

I am at the stage of finishing my upstairs bathroom. There is plywood on the floor. My plan is to put down floorboards over the ply and paint the floorboards.

Does this sound right, or have I got it in the wrong order (from the joists up):

1. Plywood
2. Underlay (5mm acoustic insulation)
3. Oak t&g floorboards
4. Paint on tanking (like this one)
5. Two coats of floor paint

Should the tanking go directly onto the plywood? If it goes on the floorboards, can I paint over it?

Why are you tanking the floorboards if your prob going to varnish them? Just curious!

Tester46

Joey the lips wrote: »

Why are you tanking the floorboards if your prob going to varnish them? Just curious!

I am going to paint them rather than varnish them. The floorboards are solid oak and the underlay under them is a cardboard-y type mat from B&Q. I want to protect the floorbaords and underlay from moisture in the bathroom. Should I tank them, or will the two (or three?) coats of good floor paint do the same job?

There should only ever be steam and some small splashing from the shower/bath in that room. It is not a Wet Room.

gman2k

I have tanked bathrooms in client properties before - used a company in Meath to do the job.
The method is fibre glass tanking; Using layers of paint on resin and woven fibre glass mesh. You are creating a tank.....
This can be directly tiled to, using appropriate adhesives.
I wouldn't trust tanking systems without the woven mesh layer, as this provides the actual strength imo.
Heres a link to another product also.
This ebay seller also sells tanking supplies

Tester46 wrote: »

I am at the stage of finishing my upstairs bathroom. There is plywood on the floor. My plan is to put down floorboards over the ply and paint the floorboards.

Does this sound right, or have I got it in the wrong order (from the joists up):

1. Plywood
2. Underlay (5mm acoustic insulation)
3. Oak t&g floorboards
4. Paint on tanking (like this one)
5. Two coats of floor paint

Should the tanking go directly onto the plywood? If it goes on the floorboards, can I paint over it?

Joey the lips

Tester46 wrote: »

I am going to paint them rather than varnish them. The floorboards are solid oak and the underlay under them is a cardboard-y type mat from B&Q. I want to protect the floorbaords and underlay from moisture in the bathroom. Should I tank them, or will the two (or three?) coats of good floor paint do the same job?

There should only ever be steam and some small splashing from the shower/bath in that room. It is not a Wet Room.

Ahh now i get you. You want to lay down ply then tank the ply so water does not get beyond the floorboards. This will work fine. Not a normal use but fine. Just be careful on the amount of water that gets between the floorboards and remember this is not a normal solution

Tester46

Joey the lips wrote: »

Ahh now i get you. You want to lay down ply then tank the ply so water does not get beyond the floorboards. This will work fine. Not a normal use but fine. Just be careful on the amount of water that gets between the floorboards and remember this is not a normal solution

Thanks. But, would I be better off tanking the floorboards after they have been laid on top of the ply and the underlay i.e. create the waterproofing at the floorboard level? Is it then possible to paint my two or three coats of floor paint on top of the newly tanked floorboards?

I want to ensure waterproofness, but we are not talking about a lot of water here.

Tester46

gman2k wrote: »

I have tanked bathrooms in client properties before - used a company in Meath to do the job.
The method is fibre glass tanking; Using layers of paint on resin and woven fibre glass mesh. You are creating a tank.....
This can be directly tiled to, using appropriate adhesives.
I wouldn't trust tanking systems without the woven mesh layer, as this provides the actual strength imo.
Heres a link to another product also.
This ebay seller also sells tanking supplies

Thanks, but a full fibreglass mesh tanking system is overkill for what I need. I simply want to ensure (within reason) that any moisture from the shower, or splashed/spills from the bath, don't get into the floorboards.

Really my question is should I

1. Lay the floorboards and then apply paint on tanking and then floor paint; or

2. Lay the floorboards, prime them with a coupleof coats of primer, and then put on two or three coats of floor paint?

BIMP

I've tanked loads of bathrooms. U cant paint over it. Apply tanking to plywood subfloor then lay ur underlay and floorboards. If painting fllor just use correct primer and paint that is water resistant.