I'm having problems with this fire-door :(
So... I need to fit an intumescent strip around the edge of a door I am upgrading to a half-hour fire door. I notice that the gap at the top (between the door and the frame) is larger than the gap at the sides. Does anyone know what the maximum gap that is allowed around the door to achieve a good fire seal using intumescent strip? Is 10mm tooo much?
Colin