Our up-and-over garage door is made of wood but is pretty heavy and good quality. I have reinforced the top of the frame with steel and fitted a strong bolt to prevent the top from being pushed in, while the bottom corners have bolts that butt against the frame to prevent the bottom from being pulled outwards. I reckon now that trying to break the frame would need a vehicle and would make a lot of noise so my next concern is to make it harder to smash though the actual panels, which are only plywood.
The best and lightest way I can think of would be to get two alloy plates cut and glue and screw them to the insides of the panels so as to form a solid additional layer with the plywood.
What glue would you recommend? I'm thinking some kind of epoxy that will set by chemical action since a water-based glue won't dry and could warp the door. Alternatively a second layer of ply, perhaps marine grade, screwed and glued with PVA would give additional strength and slow down a thief.
The best and lightest way I can think of would be to get two alloy plates cut and glue and screw them to the insides of the panels so as to form a solid additional layer with the plywood.
What glue would you recommend? I'm thinking some kind of epoxy that will set by chemical action since a water-based glue won't dry and could warp the door. Alternatively a second layer of ply, perhaps marine grade, screwed and glued with PVA would give additional strength and slow down a thief.
