I am going to replace my window section facing the terrace with a folding door. To reduce the risk of leakage due to snow against the folding door, I am considering installing underfloor heating (electric) on the outside closest to the folding door.
The idea is to remove a part of the wooden decking, lay a thin insulation board (preferably grooved), heating cables, some sort of adhesive, and then tiles on top.
Does anyone have experience with this? What type of board would work? Other material? I have about 7 cm of building height (on top of the roof sheet, which I don't plan to touch) to work with.
How far out from the window does this heated area need to go? 30 cm for example?