Install T&G flooring on joists or over sheet floor

[frankk]

Hi Guys,

I'm extending and cant decide on the best method of laying my floorboards. The existing part of the house has 108x19 Tassie Oak top nailed directly over the joists. I don know whether to use the same method for the extension or whether I should first lay a yellow tongue floor and then glue and nail the strip floor on top.

Most chippys have recommended installing a sheet floor first. Any pro's and con's of either method?

Thanks,
Frank

[glock40sw]

If you want to maintain the floor level new to old, then glue and nail to the joists. Otherwise there will be a step up from one floor area to the other.

[grinner]

In our extension, we installed a yellowtongue floor first, and put our blackbutt floor on later. This gave a platform for the tradies to work from, and didn't matter if they dropped their tools etc.

We installed the stumps, bearers and joists 19mm lower in the extension, to allow for the thickness of the yellowtounge.

Grinner.

[frankk]

Floor level wont be an issue for me. If I decide to use yellow tongue first then the bearers and joists will be set 19mm lower to compensate for this. So either way the finished floor will be level with the existing floor.

I just dont know if there will be any long term advantages or disdvantages if I have the strip floor laid over the yellow tongue floor.

[glock40sw]

G'day Frank.
If that's the case, use Y/tongue and glue and nail to it.

[Gumby]

I agree, put the YT down and then glue the floor over it. You can get 13mm hardwood flooring which is made to go over the YT instead of having to use 19mm. You end up with a really solid 32mm floor and plenty of solid hardwood timber to sand back every now and then.

[Eddie Jones]

Speaking of gluing and nailing to YT, is liquid nails ok in this application, or should you be using the Sikaflex?

[Larry McCully]

Speaking of gluing and nailing to YT, is liquid nails ok in this application, or should you be using the Sikaflex?

I favour Bostik ultraset in leu of liquid nail. Liquid nail gets brittle after a while. The bostik range of adhesive is the go.