Fire propagation on wooden facade

Fire propagation on wooden facade
21.012015
Secteur
Wood Construction
DateProject completed
Fire safety regulations include a section on the risk of fire spreading in building facades. These regulations changed in 2010. A new version of technical instruction 249 is applicable to establishments open to the public and provides generic solutions for wood construction.

Nevertheless, there is a need for evidence. The aim of this study is to include validated timber-frame façade configurations, including testing, in the future revision of Technical Instruction 249 planned for 2016. These elements will also be used in the revision of the fire regulations for residential buildings.

4 full-scale tests were carried out (LEPIR 2).

The results allowed the validation of construction solutions using timber frames and timber cladding. The following criteria are required:

Interposition of a non-combustible screen (A2-S2,d0) between the framework and the wood cladding,
Breaks in the air gap through fire seals that allow ventilation of the air gap under normal conditions and expand under the action of high temperatures,
Horizontal overlap between each floor provided by a 200 mm overhanging sheet steel skirt,
Use of wooden cladding with only jointed strips, with a minimum thickness of 18 mm at all points and a minimum density.
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Partners in this project : 
CSTB

Funders :
Codifab, France Bois Forêt, DHUP