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Old 06-29-2013, 09:14 AM   #1
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garage door header sag


my 4y/o garage has 3 2x12 boards for the 18' door header. it looks like it is sagging just a little. i have not straight edged it, but it looks to be about 1/4"ish.
is this normal and what would be a max ?
if i did need to do something about it, what would i do ?
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Old 06-29-2013, 09:36 AM   #2
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garage door header sag


Fixinit,
run a string on it and see how much it actually is. Pull the string tight. 1/4" in 18' I wouldn't worry about as long as it doesn't continue to get worse. Could have been that way from the start. I usually use engineered lumber for load bearing garage door headers over 14'.
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Old 06-29-2013, 09:36 AM   #3
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garage door header sag


all solid sawn lumber will have sag/deflection, even under it's own weight. what is the header supporting?
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Old 06-29-2013, 09:55 AM   #4
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garage door header sag


the garage was a main reason i bought this house. and the sag doesn't seem bad, but i do notice it if i look for it.

it is sawn lumber, pro built garage.

just the hip roof.
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Old 06-29-2013, 11:38 AM   #5
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garage door header sag


1/2" in 20' is probably the max allowable in that situation. You should be fine with 1/4"
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Old 06-29-2013, 12:52 PM   #6
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garage door header sag


Deflection is normally presented as the length/sag ratio, making sure the units are the same. So if you really have 1/4 inch in 18 feet, the deflection ratio is (18*12)/.25= 864. Typical maximum allowable deflection ratio for a header is 240, so that would be fine. At 1/2 inch deflection, the ratio would be about 430, still OK. So as previously noted, you need to run a string line to measure the actual deflection, your eye is simply not accurate enough.
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