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SIP panels consist of materials that do not support combustion. So, for example, OSB does not burn, it smokes in direct contact with fire, but using one layer of gypsum board for interior finishing, access to fire is delayed for at least 45 minutes. Styrofoam doesn’t burn at all; it curls up, but it doesn’t drip or burn. The main indicator of the fire safety of houses is the resistance of the walls to fire. House of SIP belongs to the 3rd category of fire safety (non-flammable), by comparison, a house of timber is in the 5th category (easily flammable materials).
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