Is it ok to use MDF or timber panels for fire rated doorsets?
The use of those type of panels mentioned above is prohibited unless there is suitable evidence from controlled tests that a specific solid panel as mentioned above and contained within a particular doorset design has matched the required rating.
The most common approach is to use a tested specification for panels with a composite construction, such a panel must have a proven non-combustible core faced either side by a minimum thickness (prescribed in assessment) of timber or MDF.
Chippy for DirectDoors.com
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