Laying plywood over wooden floorboards - a few questions

[snowmunki]

Hi,

Need to raise my currently wooden floorboards by 9.5mm to be level with the kitchen and utility which are currently tiled. A few questions though.

1.) My local timber merchants sells hardwood WBP and Softwood ply, about £4 difference per sheet, which should I go for ?

2.) Understand I should leave about a 10mm gap around the edge for possible expansion but each sheet should be butted up against each other.

3.) When I reach the kitchen with the tiles, should i butt the plywood right up against the tiles or leave a gap there, assume it can't be too big a gap otherwise when i eventually fit the LVT transition bar it will be too low.

4.) Laying plywood, will be over the hallway and into the living room. Should I leave a gap in the plywood when it goes into the living room ?

Thanks

 

[johnny2007]

Don't worry too much about expansion gaps.
Indoors temperatures and humidity are mostly stable and plywood is not subjected to much movement, especially the wbp which i would prefer.

 

[dazlight]

What are you putting over the plywood? we leave on ave 3mm gap around the skirting but each sheet butted up to each other.

 

[snowmunki]

Thanks for the replies.
I'll be putting on underlay and quick step balance LVT as a floating floor.

And butt up against the tiles in the adjoining kitchen / utility ?
And no gaps form hallway to living room ?

 

[dazlight]

No gaps between any of the plywood. And 3-5mm gap to tiles.

 

[snowmunki]

Thanks, obvious question but won’t that mean when I install the threshold profile file it will fall into the gap ? hope that makes sense

 

[dazlight]

Depends what trim you use. If you use a sticky flat trim it won’t.
If using a T section solid oak trim the. Yes you will need about 15- 20mm gap depending on the trim