Is a 25mm gap between insulation boards and floorboards safe for a suspended timber floor in a garage?
Asked by Harrison Singh 
6 months ago
Last Updated: May 27, 2024
Hey, I’m working on setting up a suspended timber floor in my garage. I plan to place insulation boards underneath the floor. I was just curious if it’s alright to leave a 25mm gap between the insulation boards and the underside of the floorboards. Just want to make sure everything is good to go!
Wait, are you converting your garage? If that’s the best method for constructing the floor, I don’t see any issues with the 25mm gap. Just make sure to have a moisture barrier over the concrete floor and proper ventilation. Then add as much insulation as you can…I believe you’ll be fine. But it’s always a good idea to double-check with your local building department.
Absolutely, it should work out just fine. And if the insulation has a shiny side, go ahead and install it with that side facing out – the space in between will help boost the reflective shield.