United States / Build / LP® SmartSide® 38 Series Strand Substrate lap siding WUI assembly
LP® SmartSide® 38 Series Strand Substrate lap siding WUI assembly — type figure.
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LP® SmartSide® 38 Series Strand Substrate lap siding WUI assembly
This is a listed siding assembly. Listing 8140-2027:0001. This site cites OSFM BML. Match the model and orientation.
LP documents SmartSide as treated engineered-wood siding and its current lap-siding instructions identify CAL FIRE BML 8140-2027:0001 as the Chapter 7A path using 1/2-inch standard gypsum wallboard behind the lap siding. ICC-ES ESR-1301 separately evaluates SmartSide and ExpertFinish treated-engineered-wood siding for code compliance and installation conditions.
LP SmartSide 38 Series Strand Substrate lap siding
exterior lap siding over 1/2-inch standard gypsum wallboard in the listed WUI assembly
Specification notes
Match the 38 Series Strand Substrate product, 1/2-inch exterior gypsum wallboard, water-resistive barrier, fasteners, overlap, joints, clearances, finish, and maintenance to OSFM listing 8140-2027:0001 and current LP instructions. ESR-1301 is evaluation evidence, not a second listing or a substitute for the WUI assembly.
LP® SmartSide® 38 Series Strand Substrate lap siding WUI assembly. FireApproved. https://fireapproved.com/materials/louisiana-pacific-corporation/. Last verified 2026-08-25.
