DIY Doctor UK DIY Forums

Hello

First timer here. I am not a builder, just someone trying to do as much as I can diy-wise as I have limited budget.

I am in the middle of converting my detached, double-skin (no cavity) garage into an office/cave. It currently has a concrete floor (5.5m x 3.3m) and I'm not sure of the best way to build and insulate my subfloor. I've searched around a bit and cannot find any information on how best to tackle this. One friend, who is more experienced at diy than me, suggested the following layers:

- DPM on concrete floor
- Treated batons
- Treated 3x2 joists at right angles to above, with Celotex/kingspan in between
- Chipboard or OSB
- Final finish, possible some kind of vinyl or linoleum, ie something that can take a bit of bashing but is easy to clean. Other budget-friendly suggestions welcome!

Does the above seem ok?
Would there be adequate ventilation, if any? Or is this not an issue?
Is there a better alternative?

Thanks for any help or advice.
Urf

Lay 75mm cellotex directly onto DPM. Leave no voids. Lay Tongue and grooved chipboard on top of Cellotex glueing joints as you go. Then coat the chipboard with 3 coats of SBR diluted 50/50 with water. Let it dry and you can la any type of floor finish you like except tiles