MCL Engineered Floor Joists

solid framing from top to bottom

Mid-Columbia Lumber’s Patented MCL Engineered Floor Joists, provide high-performance floor construction (U.S. Patent No. 10,041,251). The dimensional stability of our joists make them inherently rigid and resistant to warping and twisting. Our engineered joists are lightweight and available in 2x10 and 2x12 widths and lengths up to 60 feet. Utilizing longer length joists, makes them quicker and easier to install as opposed to traditional framing requiring multiple piece spans. MCL Joists have quicker lead times, cheaper freight and unparalleled ease on the construction site, which saves time and money while building a stronger, truer structure. Our floor joist products carry the exact same design values as solid sawn lumber and outlined by the WWPA Span Tables.


Longer, Stronger and Straighter. The design values for our structural finger-jointed products exceed national code standards making them a custom alternative to costly solid-sawn dimensional lumber.


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. 


Long length Finger-Jointed Lumber