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Old 08-28-2008, 05:36 PM   #1
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drilling thru a header


i want to install a split system air conditioner in the kitchen. i need to drill a 4" hole above the k window thru the header. is this permissible, will i jepordize the integrity of that wall/house ?? thanks

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Old 08-28-2008, 06:26 PM   #2
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drilling thru a header


First find out what size header you have. I frame all my headers with 11 7/8" LVL's but have seen 2x6's 2x8's the reason i use the 11 7/8" LVL's is no shrinkage and I don't have to install the small cripples above the smaller header. Check above the header and see if you have the room, Keep in mind that you may why ind up in the soffit. Just a thought. BOB

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Old 08-28-2008, 07:30 PM   #3
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drilling thru a header


A 4" hole would exceed the allowable hole size requirements for even a 2x12, let alone a smaller member. On a JOIST...You can drill 1/3 of the total depth. The load on a header would be higher, so drilling a large hole in it would be potentially problematic.

If you must drill it, which I advise against, be sure to drill in the middle of the depth of the joist, or slightly toward the top. You must leave no less than 2" of wood above/below any hole.
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Old 08-30-2008, 04:18 AM   #4
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drilling thru a header


Thanks for replies. i have 17" from top of window to ceiling. the hole [4" ] would have to be 2 or 3" above top of window. this is an older [100?] house with plaster lathing and stone [rocks] walls with stucko covered brick, 12" thick total. does this change anything? or do you still recomend don't do it. this is my only option if i want to install it in kitchen. Thanks.
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Old 08-30-2008, 08:07 AM   #5
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drilling thru a header


Quote:
Originally Posted by Jacques View Post
Thanks for replies. i have 17" from top of window to ceiling. the hole [4" ] would have to be 2 or 3" above top of window. this is an older [100?] house with plaster lathing and stone [rocks] walls with stucko covered brick, 12" thick total. does this change anything? or do you still recomend don't do it. this is my only option if i want to install it in kitchen. Thanks.
I have worked on many older homes within that era. most here were balloon framed with 2x4 headers on a standard 2'-6" (30") window. I would check above the window and see what is there. you could check it by drilling small holes (1/8") in the area you are talking about. in older homes it was common to find 4" and bigger moulding around doors and windows.So if your saying 2-3" above the window plus the casing you might be just above the header. Then you should be fine,
I would strongly advise against drilling the header.
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Old 08-30-2008, 11:54 AM   #6
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drilling thru a header


Yup, you've got to locate the header, because it isn't 17" deep. There's probably some stud framing in there. You need to find a gap between the studs and drill there. It will involve some elploratory drilling and subsequent patching.
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Old 09-06-2008, 07:26 AM   #7
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Thanks for taking the time to reply.

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