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I want to turn my garage into a bedroom; I would like to know how to insulate the concrete slab of the garage before laying a floating floor?

It all depends on whether or not you can raise your floor. If this is not possible, you will need only a thin layer (2 to 3 mm) insulation (eg polyethylene foam). If you have the possibility to raise your floor from 5 to 20 cm, you can install insulating panels of small thickness (for example in poystyrene or extruded polyurethane) and pour a mortar screed or make a dry cap.

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