Microllam® LVL and TimberStrand® LSL is appropriate for dry-use applications only (generally not directly exposed to precipitation) and cannot be pressure treated. Neither product is suitable for the pressure treatment process due to material density and adhesive content. Also some wood species used in their production may not be appropriate to absorb the treatment chemicals.
The best choice for exterior use is our treated Parallam® Plus PSL. Our treated Parallam® Plus PSL is made from Southern Pine which is a species that can be easily treated.
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