Parallel strand lumber (PSL)

Parallel strand lumber (PSL) is a product manufactured from strips of veneer measuring approx. 3 mm in thickness and 15 mm in width. Phenolic resin is used to bond the individual veneer strips. These can be up to 2.6 m long, before the strips are bundled together with their individual ends offset and with fibres oriented primarily parallel to the major axis of the beam. In a continuous press the veneer strips are pressed to form an endless beam. Douglas Fir (DF) and Southern Yellow Pine (SYP) are the most commonly used wood species. Parallel strand lumber is designed to be used in structures with long free spans. In order to obtain components with large cross-sections, PSL members can be bonded together.

Parallam is the brand name for a structural composite lumber (SCL) product invented, developed, commercialized and patented by MacMillan Bloedel (now Weyerhaeuser). The generic name for the product is parallel strand lumber (PSL).

Parallel strand lumber (PSL)

 
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