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    • CommentAuthorarchess200
    • CommentTimeApr 11th 2017
    Building Regs require Class 1 spread of flame internally to protect a timber-frame structure. I have specified plywood finish within bedrooms, under the vaulted ceiling [fixed to Sterling board] and on the walls of the timber frame. I am using 9mm ply. Floors are hardwood onto the timber joists. It is the walls and ceiling that need the Class 0. Cost of this is going to be over £1200 just for the clear varnish treatment material. Any experience of protecting plywood against fire, what to use, how to make it affordable?

    Seems strange to protect the walls and roof against fire but no requirement for the floor.

    I don't want to put plasterboard behind the plywood due to space, weight and mess. Suggestions and comments please.
    • CommentAuthorEd Davies
    • CommentTimeApr 11th 2017
    I, too, would be interested in any answers.

    I'm not bothered about clear for the finish as I want to paint most of the inside white to help with having relatively small window areas. I wanted timber boards but BC have required a paint to prevent spread of flame which I've yet to price up but realise that once I do I might go back to plasterboard.

    Posted By: archess200Seems strange to protect the walls and roof against fire but no requirement for the floor.
    Not sure but I assume that the theory is that by the time the fire's spreading across the floor the room, and probably the house, is gone anyway. Remember that building regs are mostly about saving people in the building - it's conceivable somebody would escape from or through a room with fire on the walls or ceiling but less likely for the floor I'd imagine.
    • CommentAuthorIan1961
    • CommentTimeApr 11th 2017 edited
    You can buy plywood which already meets the class 0 and class 1 requirements in the Building Regs however it will almost certainly be cheaper to apply the fire retardant paint or varnish afterward.

    If using varnish it doesn't have to be a gloss finish. Matt finishes are also available which will keep the original look of the plywood.
    • CommentAuthorringi
    • CommentTimeApr 11th 2017
    Posted By: archess200
    Seems strange to protect the walls and roof against fire but no requirement for the floor.

    Take a bit of dry wood and put it on top of a burning fire lighter and see what it does, then repeat with putting a burning fire lighter on top of the bit of dry wood.....

    Have you every seen a fire with the flames going down?
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