FD30 (30 minutes) fire doors are usually 44/45mm thick, as opposed to the standard door thickness of 35/40 mm, FD60 (60 minute) fire doors most commonly used in commercial settings are normally 54mm thick. Specially constructed fire doors can have a rating of 3 hours or more.
Most fire doors have a solid core construction which can include: particleboard, flaxboard, magboard and solid timber. The assembly of a fire door can vary greatly, some have: a timber framing around the core with a laminated veneer; others have a lipping (5-20mm thick) around the core with a veneer on top; and in some cases a plywood, veneer or MDF facing is glued on to the core without framing or lippings. There is no preferred construction method, as long as the desired fire rating is achieved.
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