Does a pre-fitted steel frame for a (single-width) (Garador) garage door need fitting at the top? Or is it strong enough to function if it is only fixed at the sides?
The reason I ask is that my garage door opening, once I've knocked all the rotten timber out, will be about 10cm higher than the highest door that that manufacturer makes at the required 8ft width.
Sorry to ask here, but I emailed Garador and the guy who answered from their sales desk was a cut-and-paste merchant who couldn't be bothered to get his head around the question.
Basically I would like to pay a supplier to supply and fit, and then I can put a strip of non-structural plywood between frame and lintel. If I have to fit solid timber framing across the top, which would require some vertical pieces if it is to stay in place, I'd be tempted to think I might as well fit framing down the sides as well, and buy a door without a pre- fitted frame.
Thanks in advance.
Harry