CLT: Fire Protection

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Fire protection and the combustibility of the CLT assembly may need to be considered to meet local building and fire code requirements.

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For CLT construction exceeding 40 feet (122 m), section 1402.5 of the 2018 IBC requires that CLT wall assemblies with a combustible WRB membrane are tested following NFPA 285 procedures. 

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RevealShield SA Self-Adhered testing results conform to the exceptions noted in the standard.  The chart below outlines the standards vs. results from RevealShield SA.

REVEALSHIELD SA SELF-ADHERED WRB/AIR BARRIER CONE CALORIMETER TESTING RESULTS

PROPERTY REVEALSHIELD SA CONFORMS
TO EXCEPTIONS FOR 1402.5

EXCEPTION TO 2018 IBC SECTION 1402.5 

     

Peak Heat Release (HRR)

98 kW/m2 150 kW/m2 or less

Total Heat Release HR

4.0 MJ/m2 20 MJ/m2 or less

Effective Heat of Combustion

5.1 MJ/kg 18 MJ/kg or less

Flame Spread

0 25 or less

Smoke Developed

75 450 or less

Navigating Fire Testing

NFPA 285 Overview

Learn more about the complexities of NFPA Testing in VaproShield’s Technical Bulletin.

Comprehensive Testing

Comprehensive testing data is available for all VaproShield membranes and accessories.

CLT Emerging Practices

CLT construction practices are still relatively new in North America, and codes are continuously being updated to accommodate more prescriptive paths to fire compliance for CLT assemblies.

Project Fire Protection

It is recommended that project-specific fire protection requirements are confirmed with the local jurisdiction having authority.

VaproShield Membranes Offer Solutions

VaproShield’s sheet membranes are highly vapor permeable, simultaneously managing bulk water while allowing for some drying of underlying materials.

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CLT Design Guide

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Wall Details

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Roof Details

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Prefabrication