Garage Door Rough Opening

Hey Framers; here’s one you really should get right, cause it’s a real bummer to fix if you get it wrong. This blog is for the most part; tricks. as getting on with the frame can be more fun if the ‘tricky’ parts are not wrought with worry.1. Check the plans for ‘Shear Details’. Your shear details will note the minimum width a side panel can be on each side of the garage rough opening. It might call for a Simpson or Hardy metal panel, or an I-Level TJ panel made out of wood. For most apps, its standard framing with plywood for shear. FOR SHEAR DUDE ! Anyway, the inspector will have a field day here if it is not to spec. 2. Check the stab sets and anchor bolts. Structural panels come with templates and directions. I hope the con-creatures did it right. For standard framing, your specs might call for 4X4 posts, that are anchored to M or Htt-22’s or HD2A’s, which are a Simpson product; for which the Simpson book will give you the offsets for framing. Use the book in conjunction with the plans to achieve the desired results of your draftsman or architect. 3. Measure the door opening for width. The con-creatures ( affectionately known as) will leave ‘call size’ plus 3 inches from stem wall to stem wall. Ie; if a garage door is a 16/7, that is 16 feet wide, by 7 feet tall, then the width of the concrete between the stem wall should be 16’3″. ( The 3″ is for the finish jamb) Headers should always rest upon at least 3″, or double trimmers each side. Your specs may call for 4X4 trimmers. Our example calls for a 16’9″ header. 16′ for ‘call’, 6″ for the double trimmers both sides, and 3″ for the finish jamb. 4. Layout for the height standard using a 7 foot tall roll up door requires some thinking according to the garage slab height, and the total height of the wall. You must add one and a half inches to the call size in height for the finish head jamb if you are using 2X jamb; the measurement from the garage slab to the bottom of the header.  5. The Trick:Grab a stud from the garage wall studs. Lay out the header height on the stud.

L/O for Header Height

a. Measure how tall the stem wall is from the slab, to the TOP of the MUD SILL PLATE . Whatever that measurement is, place that measurement you attained, right on the end of the stud and hold it there. b. Now extend the tape up the stud 7′ 1&1/2″ . Mark it. This is the bottom of the header from the garage slab.

If your specs are correct and everybody has done their jobs right, you now can frame the garage door opening to standard practice. Shear with whatever grade the plans call for and add any metal strapping your architect notes. Always read the plans for additional notes, and special direction from the lead man or contractor. Now hit-em up for a raise.



2 thoughts on “Garage Door Rough Opening

  1. All my posts come from over 40 years experience in residential construction and re-modeling. I just ‘write what I know’. Take advantage of my experience. You’ll save bucks.

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