Since bifold doors do not come pre-hung, what size wood is best needed to create a finished door opening?

Use a wood jamb and casing to wrap opening
Use drywall and corner bead to wrap opening
Use drywall and corner bead to wrap opening then apply casing
A48"wide door has a finish of 48" and so on BAM

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Originally Posted by bfeidt

Since bifold doors do not come pre-hung, what size wood is best needed to create a finished door opening?

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The casing you should look for is called half jam. It's approx. 1 1/2" wide, and usually 3/4" thick. It would sit at the very front of the finished opening and would act like a full door jam, in that it would create a fixing point for the external door casing/trim. The half jam would be installed to the laft and right hand side as well as the top.

Your Jamb Thickness Should Be 3/4 Your Jamb Width Needs To Be 4ft,5ft Or 6ft
Those Are Standard Size Opening You Also Do Not Need To Alow For Margins For The Doors Make The Jamb Exactly One Of Those 3 As Far As Jamb Height You Can Make It 6ft 8 " Also The Jamb Material Needs To Be 4 1/2 This Accounts For The Framming And Drywall, Good Luck , Nichols Trim

A bifold requires an opening the same size as the door. So if you have a 48" wide bifold you need a finished opening of 48". Most bifolds are slightly undersized, that's why you normally use the same finish opening as the door size. The height is 6'-8" tall too, as the doors are undersized for height also.