I need to raise the floor in my garage up to meet the hallway. the difference is 6 inches. what is the best way to do this? Do I need to put a damp membrane down first? I have searched Google but can't find any real guides.
You need a dpm if you are unable to confirm one is under the slab already though for the small cost you should fit one anyone. Then use 140mm polystyrene insulation and floating 22mm T&G plywood boards on top. This will also get you to the required U Value. Stick a solid joist under door thresholds.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local