Traditional Fir 4-Panel Bifold F-44-2

Traditional Hemlock

Half-Louvered Bifold H-1424

A Folding door is a type of door which opens by folding sections or panels. Folding doors are also known as “bi-fold doors”, in spite of them most often having more than two panels. A more older term is ‘concertina’ doors, inspired by the musical instrument of the same name.


  • 2' 0" x 6' 8" x x1-3/8"
  • 2' 6" x 6' 8" x x1-3/8"
  • 3' 0" x 6' 8" x x1-3/8"
  • 4' 0" x 6' 8" x x1-3/8"
  • 5' 0" x 6' 8" x x1-3/8"
  • 6' 0" x 6' 8" x x1-3/8"

Door Documents

 Match Up Sheets, The Anatomy of a Door, and more!

Contact Us

Frank Lumber “The Door Store”™
17727 15th Ave. N.E.
Shoreline, WA 98155
P: (206) 362-2311


Our Services

Frank Lumber's team of expert sales-people provides you with personalized service and advice for all of your door projects.

Odd sizes and out of the ordinary doors are our specialty, we welcome them. Custom homes, remodels, commercial projects, or single door replacements- we are here to help you right now.

About Us

Frank Lumber was established in 1948 supplying building materials and hardware to the North Seattle area.

Frank Lumber began selling doors during the 1960's to satisfy demand by local contractors. Doors became an ever-increasing part of our business and today we specialize in doors and door hardware.