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New 49+ Fireplace Hearth Extension Code Requirements

New 49+ Fireplace Hearth Extension Code Requirements. I was wondering what the hearth extension code is for a raised factory built fireplace. Code calculators automatically generates a detailed list of requirements. Hearth extensions will need to be at least 2 inches thick. That's great for warmth, but you must make sure the materials surrounding your fireplace are not flammable. Fireplace Hearth Extension Code Requirements - 3 7 3 3 Chimney Construction If this firebox is a regular fireplace, you have an odd opening there.