Need help framing in a bifold door...

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Old 11-23-18, 11:49 AM
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Need help framing in a bifold door...

I'm putting in a wood bi fold door and I'm ready to frame the opening. I read the specs of the door and it said to make the opening the same size as the door. The door is 36x80 so does that mean I make the rough opening 35 1/4 x 79 1/4 which will allow for my 3/4" inner wood trim. Are these door exactly 36" or should I allow and extra 1/8" for a gap space?
 
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Old 11-23-18, 12:27 PM
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It depends if you are doing drywall jambs and corner bead or if you are doing wood jamb and It depends if you are doing drywall jambs and corner bead or if you are doing wood jamb and casing.

The FINISH opening for the door should generally be 36x81. So if you are doing drywall returns the RO is 37x81 1/2. But if you are doing a wood jamb then its 38x82... which allows room for shims around the jamb to plumb it up.
 

Last edited by XSleeper; 11-23-18 at 01:58 PM.
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Old 11-23-18, 01:46 PM
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I'm going to nail 3/4" board to the inside of my frame so I can stain and put trim molding around the door. So if I should frame it 38x82 this will give me a 1/4" gap on both sides and enough adjustment space on the bottom for flooring or carpet?
 
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Old 11-23-18, 02:01 PM
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Yes. You build a door jamb that is 36x81 (inside dimensions) and put that inside your 38 x82 opening, shimming it so it is level and plumb. Your bifold should say what the finish (inside) dimension should be.
 
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Old 11-23-18, 03:49 PM
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ok, thanks for the help..
 
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Old 11-23-18, 04:07 PM
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Not sure if you knew or not but you can buy standard door jambs and door stop to make your door jamb... or if you have some odd wall thickness just make them out of solid wood that you rip to the correct wall thickness on a table saw.
 
 

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