I'm converting an old shed and want to insulate under a new (level) concrete floor that will be poured on top of an existing concrete slab. What is the best underslab insulation to use in this situation?
Welcome to the Bunnings Workshop community. It's splendid to have you join us, and thanks for sharing your question about under slab insulation.
Allow me to make some inquiries regarding under slab insulation. As soon as I have more information, I'll get back to you.
Thank you for your patience.
I spoke to my trade specialist today and they recommend using "Foilboard Slabmate". It's a special-order product and can only be ordered in pack quantities. The smallest pack you can get is the one that is 100mm thick and it comes with five sheets. I propose speaking to your local stores trade specialist to get more details about the product and how long it will take to get into the store.
If you need further assistance, please let me know.