UL Solutions has released a comprehensive Q&A article on fireblocking, an essential safety measure in building construction.

Published on November 29, 2023, the article demystifies fireblocking, underscoring its significance in preventing fire spread in concealed spaces within buildings.

This release is a critical resource for industry professionals and stakeholders in the building and construction sector.

Understanding fireblocking: Material and necessity

Fireblocking, as defined by the article, is a material approved by code officials or authorities, mandated by building codes to inhibit fire spread in concealed combustible spaces.

This requirement is rooted in Sections 718 of the 2021 International Building Code (IBC) and R302.11 of the 2021 International Residential Code (IRC).

These codes mandate prescriptive fireblocking in specific locations within a building to disrupt the continuity of concealed spaces, thereby mitigating fire hazards.

Application and installation of fireblocking

The article explains that fireblocking is necessary in various parts of a building, particularly where there are concealed spaces in wood frame construction.

This includes intersections of walls and floors or ceilings, connections between vertical and horizontal spaces, and around openings for vents, pipes, ducts, cables, and wires.

The building code specifies a variety of materials for fireblocking, including gypsum panels, lumber, cement board, and insulation types like mineral wool and glass fiber.

Although the installation method is not prescribed in detail, maintaining the integrity of fireblocking materials is emphasised.

Distinguishing fireblocking from firestopping

A crucial distinction made in the article is between fireblocking and firestopping.

While fireblocking involves installing approved building materials to slow fire progression in combustible construction, firestopping is a certified system designed to protect penetrations through fire-resistance-rated assemblies.

Firestopping systems must undergo testing as per UL 1479, the Standard for Fire Tests of Penetration Firestops, or ASTM E814 to maintain the assembly’s fire resistance rating.

IFSJ Comment

The UL Solutions explainer on fireblocking is a vital resource for the fire safety and building construction industry.

By clarifying the purpose, application, and materials of fireblocking, it enhances understanding among professionals, contributing to safer building practices.

The distinction between fireblocking and firestopping is particularly significant, highlighting different approaches to fire safety in building design.

This publication not only informs but also potentially influences compliance and implementation of fire safety measures, reflecting the ongoing commitment to safety in the built environment.