Garage door Rough opening General Garage Discussion. I used the exact 9×8′ dimensions for my RO per recommendation from the door company, but then trimmed with 3/4 trim and then the sealer strips ( 3/8 ea). Garage door sizes and standard garage doors dimensions chart. While building a new garage it is better to check available sizes, make a selection and create a rough opening according to manufacturer specifications. 9 x 8. 274 x 244. 20 x 7. 607 x 213. 10 x 8. 305 x 274. 14 x 8. 427 x 244. I found a 9X7 overhead door (got extra panals so it coul. Report to Moderator Re: POLE BARN AGAIN in reply to Willie, 02-04-2002 12:57:14 according to general aluminum door company, make the finished opening the same size as the door, then use garage door weatherstrip to seal the edges. Also, make sure your springs are correct. springs and cables made for a 9×7 door WILL NOT work for a 9×8 or 10×7. I rough framed my pole barns 8’x10’door opening exactly 8’x10′.
A 9×8 can take a full sized van, or a pick-up with oversized mirrors. 3. Need garage door installation instructions for a Wayne Dalton garage door? Download instructions on installing a garage door here.