Replacing bathroom floorboards and what's a noggin?

[Neobright]

Hello all,

I am renovating a bathroom and having searched around the forum I think I have found the solution, however I wanted to double check.

I am removing all the flooring back to joists, then:

25mm exterior WBP screwed every 300 mm(?)
3mm fibreboard underlay (to help reduce sound amongst other reasons)
15mm solid wood flooring, glued together (flooring is rated ok to use in humid environments such as bathroom)

My questions are:

1) Should I screw every 300mm on every joist?
2) What screws should I use and do I need to countersink the heads?
3) Many sites/questions discuss using a noggin. Am I correct to say a noggin is simply a piece of wood attached to a joist? If so how do I attach it to the joist? Screw? No more nails? Nail?
4) Should I use 22mm WBP as I am flooring over the top?
5) Does my idea generally sound ok?! Have I missed anything?

Thanks very much in advance for any advice/assistance.

Cheers,
James

 

[Neobright]

no replies to this post, could anyone help/advise please?

 

[Richard C]

My questions are:

1) Should I screw every 300mm on every joist?

Yes

2) What screws should I use and do I need to countersink the heads?

Ordinary zinc plated screws, decking screws or even plasterboard screws, whatever you can get the cheapest. No, you won’t need to countersink, use a power driver on torque & they will bury themselves.

3) Many sites/questions discuss using a noggin. Am I correct to say a noggin is simply a piece of wood attached to a joist? If so how do I attach it to the joist? Screw? No more nails? Nail?

A noggin is a piece of wood that spans & is securely fixed between 2 adjacent joists. It’s attached using screws (preferably) or nails through the adjacent joists; don’t attempt to fix with NMN. Noggins provide essential support for tiled floors but I wouldn't have though they would be necessary with solid timber flooring.

4) Should I use 22mm WBP as I am flooring over the top?

22mm is more than sufficient for even ceramic tiling & way OTT if you’re laying solid wood flooring over the top; I would use something much thinner to act a base but avoiding a large step up from the adjacent floor level; I’m no expert on laying solid timber flooring but would have though with 15mm solid floor over the top & if it’s interlocking, a 6mm WBP ply base would be sufficient but I’m open to contradiction from the experts on that one.

5) Does my idea generally sound ok?! Have I missed anything?

Generally sounds OK but you seem to be over egging things a bit. I would also think again about using solid wood flooring in a bathroom in spite of what the manufacturers may say, especially if there’s any chance of kids splashing water everywhere.

 

[Neobright]

4) Should I use 22mm WBP as I am flooring over the top?

22mm is more than sufficient for even ceramic tiling & way OTT if you’re laying solid wood flooring over the top; I would use something much thinner to act a base but avoiding a large step up from the adjacent floor level; I’m no expert on laying solid timber flooring but would have though with 15mm solid floor over the top & if it’s interlocking, a 6mm WBP ply base would be sufficient but I’m open to contradiction from the experts on that one.

Well that is good news. I can get 12mm easily from a local DIY store, any more and I'd be off to a timber merchants, at clearly a lot of cost!

Thanks Richard for your informative replies, I feel a lot more confident about pressing ahead.

Cheers!