Home Improvement--General/Bi-fold door installation


Hi Tony:

I am framing a basement and just completed construction of the rough opening for a set of bifold doors to enclose the furnace. My question is, can I attach the upper rail to the header or should it be attached to the wider framing that surrounds pre hung doors (for drywall purposes)? Thanks in advance.

Hi Kevin,

The rough opening should be finished before doors are installed. This can be accomplished by either finishing the jamb area of the opening with drywall or installing a jamb and casing.   

Unless the rough opening was framed to size for a drywall jamb, a wood jamb and casing should be installed in the rough opening prior to attempting to hang the bi-fold doors.  The jamb boards for a 2"x4" framed wall with 1/2" drywall on both sides should be ripped to 4-9/16" wide. Be sure the inside width and height of the jamb are the correct size to accommodate the doors and ensure the jamb is installed plumb and square.

The jamb along with the attached door casing will finish the rough opening and provide the proper mounting surface for the bi-fold doors.

Best regards,

Home Improvement--General

All Answers

Answers by Expert:

Ask Experts


Tony Wood


I can answer a wide range of home improvement and maintenance questions. My expertise is in carpentry, painting, framing, siding/boxing, doors, windows, decks and screen and glass enclosures. Wood's Home Maintenance Service


I am a life time resident of North Carolina with over 30 years experience in multiple facets of the industrial, commercial and residential construction industry. For the past 23 years I have owned and operated Wood's Home Maintenance Service , providing services primarily in Johnston, Wake and Sampson Counties of North Carolina.


Several Home improvement articles published on Angie's List and other online forums.

High School graduate ~ proficient in CAD (computer aided design), Open Office program suite.

©2017 About.com. All rights reserved.

[an error occurred while processing this directive]