For instance if the width of the garage door is 8ft the rough opening should be 8ft 3 inches wide.
Framing arched garage door opening.
If it s 9ft the opening must be 9ft 3 inches and so on.
Install the header on top of the trimmers and nail.
Measure spring line from the floor to point at which the arch begins to curve.
Framing rough opening sizes are really quite simple.
Verify width at bottom middle and top of door opening.
Screw the 2 x 4 s back together reforming the 36 inch by 12 inch l.
Rip several pieces of wood blocking to the width of your framing lumber minus the thickness of the two pieces of plywood in this case a 2 4 minus two 3 8 in.
This lumber will be used to attach your garage door track and a portion of your assembly.
Just add 2 to the width of the actual door size.
The width of the rough opening should be 3 inches greater than the width of the garage door you are purchasing.
Header requirement 2 at minimum the header should be 12 wide with doubled 2 4 at opening and ceiling running the width of the door with a 2 4 in the center of the opening for the center bracket to attach to.
Measure door width from door jamb to door jamb.
Repeat the process to form the other corner.
Measure door height from the floor to the center of the arch.
You should add 2 1 2 to the height of the actual door.
This is usually done by fastening two 2 6 s to the back of the frame from the floor to as high as the hardware will go to.
For standard hardware this is usually around 18 inches above the header.
To me this destroys the whole look of the house and only shows a lack of planning.
Speaking of disappearing panels and arched openings this also brings up the question of what is the best type of garage door to use.
Back framing the garage door first the inside vertical jambs are lined with wood to mount the track to.
Measure layout and cut two plywood arches that represent the top of your arched door opening 2.
Pieces of plywood equals 2 3 4 inch wide blocking 3.
Pull a measurement from the floor of your space to the ceiling next to the door opening.
You get the picture.
Nail or screw 2 x 6 jambs to the framing on the top first and then the sides of the rough opening.
If you are using a raised panel door the edges of the panels will disappear behind the wall if you make the opening too small.
Screw the plywood to both sides of the l placing a three inch screw every six inches.
Cut two 2 x 6 pieces of lumber and attach to the face of the wall running from the edge of your garage door jambs to the ceiling of your garage.
Cut the header from 2 x 12 lumber and to a length of the rough opening plus 6 inches.