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Fire compliance is increasingly becoming problematic for timber weatherboard products – particularly in applications which are close to boundary or more than 7m in height.
Intumescent primers can be used to protect timber from fire risk, and act as a fire retardant. An intumescent primer contains a substance that swells as a result of heat exposure.
Because it increases in volume and decreases in density, intumescents are typically used in passive fire protection applications.
The use of intumescent primers need to be considered as part of a system. Each timber species has its own reaction to fire, and the subsequent top coats of paint, can all affect the way a timber weatherboard reacts to fire.
For this reason it is important to test a specific timber, primer and top coat combination for compliance to the building code, typically using a test method such as ISO 5660.
Talk to the team at Abodo regarding fire retardant timber cladding requirements.