Finger-Jointed long-length lumber

Longer, Stronger, Straighter

Mid-Columbia’s S4S (Surfaced Four Sides) Engineered Finger-Jointed products have gained wide acceptance in the building and construction industry as the best. Our engineered Finger-Jointed products design values match exactly to standards set for solid sawn dimensional lumber. WWPA Span Tables


Long-length lumber Video

Advantages of Engineered Finger-Jointed Lumber

Our innovative joint construction is designed to produce THE BEST joint in the industry. We have redesigned the finger length, profile, pressures and glue spread to give MCL our strongest joint construction on record. They stay straighter than solid-sawn dimensional lumber with:

  • Less Crook.
  • Less Bow.
  • Less Twist.

All MCL FJ Engineered Wood Products are surfaced dried and fully interchangeable with solid-sawn dimensional lumber of similar species and grade.

For builders and code officials, the use of structurally Finger-Jointed lumber is accepted for building design in the United States.  Section 2303.1.1.2 of the 2015 International Building Code (IBC) states the following:

“Approved end-jointed lumber is permitted to be used interchangeably with solid-sawn members of the same species and grade.”

Furthermore, sections 2306.1 and 2307.1 of the 2015 International Building Code reference the National Design Specification for Wood Construction (NDS), published by the American Forest & Paper Association, for the structural analysis and design of wood-based structures.   Section 4.1.6 of the 2015 NDS states the following:

“Reference design values for sawn lumber are applicable to structural end-jointed or edge-glued lumber of the same species and grade. Such use shall include, but not be limited to light framing, studs, joists, planks, and decking. When finger jointed lumber is marked “STUD USE ONLY” or “VERTICAL USE ONLY” such lumber shall be limited to use where any bending or tension stresses are of short duration.”

MCL Lumber Products available in these Species

doug fir

Our Douglas Fir raw material comes from the highest quality Douglas Fir mills in the Pacific Northwest. Douglas Fir (DF) is often the standard against which all other framing species are measured. Its strength combined with a superior strength-to-weight ratio, high specific gravity (for excellent nail and metal truss plate-holding capability), excellent dimensional stability (giving “green” DF products the ability to season well in service), the moderate decay resistance of its heartwood, and documented excellent performance record against strong forces resulting from winds, storms and earthquakes, have given Douglas Fir its reputation. It is also tight knotted and close grained, adding the bonus of beauty to its structural capabilities.

Hem Fir

Hem-Fir is a species combination of Western Hemlock and the true firs (Noble, California Red, Grand, Pacific Silver and White fir). With strength properties slightly below Douglas Fir-Larch, this is an extremely versatile species group.

SPF Spruce-Pine-Fir (South)

This species combination, classed as moderately strong, is cross-continental in origin. Because of similar design values, the combination includes Engelmann and Sitka spruces, and Lodgepole Pine from the West, along with Balsam Fir, Jack Pine, Red Pine and several eastern spruces from the U.S. Northeast. SPF-S grademarked products may originate from either region and be graded either by or according to grading rules published by WWPA, the West Coast Lumber Inspection Bureau (WCLIB), or the Northeastern Lumber Manufacturers’ Association (NELMA). 
SPF-S design values make it appropriate for general framing applications. In the higher, structural light framing grades, dimension products are appropriate for light trusses and other engineered applications.