KLH Design CLT 5-ply wall, exposed (2-hr tested)
2-Hour Fire Rated Mass Timber —
TESTED per ASTM E119 (Southwest Research Institute, 2/12/2020; documented in the WoodWorks Inventory of Fire Resistance-Tested Mass Timber Assemblies). Loaded 5-ply, 175 mm (6-7/8 in) KLH CV3M1 CLT wall with surface-spline panel joints and no protection on either side (exposed CLT); achieved 120 minutes of fire endurance, supporting a 2-hour rating. (Details per the cited source; confirm before specifying.)
TESTED per ASTM E119 (Southwest Research Institute, 2/12/2020; documented in the WoodWorks Inventory of Fire Resistance-Tested Mass Timber Assemblies). Loaded 5-ply, 175 mm (6-7/8 in) KLH CV3M1 CLT wall with surface-spline panel joints and no protection on either side (exposed CLT); achieved 120…
The full text is for BuildSpec members
Read the complete section, search across every adopted code, run the calculators and ask Copilot — free for 14 days, no card required.
- Layer-by-layer components with thicknesses
- Cross-section diagram
- Applicable code sections and test standard
- 6 related assemblies