foam board

Is there a table somewhere to show how foil backed board compares to rockwool? I have 50mm thick foil backed board on my wall, but 200mm thick rockwool under my floorboards. From a warmth perspective, how do the 2 compare? Example: 50mm board is the equivalent of 300mm rockwool etc. (I've...

Hi community Does anyone know how you can level a ceiling render which has a slight slope so that a door can fit nicely. I've attached a photo for reference. Research suggests using hard foam board. Scrubbing the slope... Cutting and gluing it on. Not sure if anyone here has better advice

I am curios if this is doable or would work. I have a small single skin block shed. Now I am wondering if you can use foam tile backer board like Q Board dot and dabbed to the wall as both the vapor barrier, insulation and paneling without using plasterboard? This panel is meant for wet rooms...