Floating floor in garage

[mdnorth]

Hello looking to insulate the garage to use in winter. I have a sealed concrete floor, I had assumed a damp proof membrane, celotex, polythene sheet then 22mm chip board flooring. I have been googling, and it looks like if I can use celotex insulation and negate the need for a damp proof membrane is this right ? The last floating floor I used polystyrene rafts. Can anyone please advise many thanks

 

[Burnerman]

As its a garage, I'm afraid you cant assume too much - depending on the age of the property which may have a bearing on things. What I mean is, there may be a DPM or not.....
Consider using a Permagard water proofing solution on the clean. bare concrete and then constructing a timber frame 3x2" maybe - which can give you space for the insulation slabs and support to the proposed floor.
Are the walls of your garage single skin, by any chance?
John

 

[mdnorth]

Hi thanks for the reply, house was built in approx 1968-70 the garage is external to the house. So use a dpc on the concrete floor ie 1000ga and then a wooden structure 2" high, then the celotex on top of that then the chipboard flooring ? Walls are single skinned brick.

 

[mdnorth]

Sorry miss read your reply, the garage floor was sealed and then painted with garage floor paint by myself about 2 years ago.

 

[Burnerman]

That sounds ok, but do make sure the land outside is nice and low. Water can penetrate through a single skin wall, so I'd be tanking that inside too. For that I used Evercryl from MKM.
John

 

[mdnorth]

OK thanks for the advice