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PSL is a high-strength type of structural composite lumber that is made from long strands of veneer that are glued together with high strength adhesives under high pressures and cured with radio frequency energy. Parallam® is the brand name of PSL that is available today.

In our home, Parallam® columns are used to support Parallam® marriage beams that run longitudinally along the interior walls of the house modules. Diagonal PSL roof braces are installed between the marriage beam and the hinge line on the roofs to support the roofs during transport and during their final installed position. Additional PSL beams are used to support the roof where it rests on the south facing wall of the house. A structural ridge beam made from PSL is installed in the attic to support the upper edges of the folding roof assemblies. This ridge beam is supported by the end walls, a central PSL column, and a truss on the west end of the carport.

Smaller Parallam beams are placed perpendicular to the marriage beams to help resist thrust loads exerted by the roof onto the exterior walls. These smaller beams run south to north through the house. A truss is placed on the west end of the house to support the carport roof. This truss is also constructed using preservative treated Parallam®.