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Q:What size timber sub frame do I need for a timber garage door?
The sub frame can be pretty much any size to create the opening for the timber door panel to install into but there is a minimum width required
The standard timber sub fixing frame for a timber up and over or a pair of timber side hinged garage door has generally always been 70mm x 70mm with a shift up to 90mm x 70mm when the door gets a bit bigger than a single door to take the extra weight and forces.
This refers to the size of the timber surround seen all around the timber panel and the timber panel will always have tolerance size built in depending on the construction and the manufacturers operating mechanism.
Of course as with any up and over door you can fit the door and frame in-between OR behind the opening and the frame dimensions should reflect this as going behind an opening you may well need a wider timber section for the legs to get a proper fixing into the structural opening.
You need a timber sub frame to install the operating gear to in the case of an up and over door and for the hinges, lock keeps, door stays and so on for all side hinged timber doors. The timber sub frame is generally supplied with most of the doors we supply and for many models you can have steel box section sub frame instead which is technically a better option and works out at the same 70mm size generally all round.
For a timber garage door requiring a matching timber sub frame just be aware that most timber garage doors are manufactured from cedar wood and you cannot get a cedar wood fixing sub frame as it is not suitable as a timber for this purpose but you can get either a softwood or hardwood timber frame with cedar wood cladding to the front and return and this will ensure a perfect match with your door panel.
