We have an insulated double width tilt door on our garage. We are in Ballarat, where warmth is valued. The heritage adviser wanted a door that looked like the old garage double swing doors, made of tongue and groove vertical boards.
We bought used lining boards, and could have just screwed them onto the outside of the door. The door is of galvanised sheet with shallow horizontal stiffening grooves every 350mm. The gal frame is 100mm deep, so we stripped the springs and struts off each side, turned the door around so the outside is now inside, replaced the fittings and re-hung the door, insulated the 100mm gap with fibreglass batts (polyester would be better as it is lighter), fixed reflective sarking over that, and screwed on the lining boards.
The sun is not an issue as the door faces south. It still needs rubber seals at all edges to stop airflow.
The door was heavy for my better half to lift, so it was motorised.
The roof has sarking under the iron, and inside the one timber wall.




