Before putting in the ceiling, all openings, with which the fire was able to find the acceleration to the structure above, must be properly fire stopped. It is best to use the materials for the firewall, such as mortar crushing of garbage, plaster, concrete, hollow tile, block of plaster, broken brick, or similar material containing sufficient fine material to fill voids. 
Such openings can be found around plumbing fixtures and bathroom service (especially coming from the taps of the light fixtures bathroom), and between joists or studs, which join the foundation. The firewall can be supported by horizontal strips of wood, no less than two inches thick, or by the coupling of metal or wire.
Several materials are used for the purposes of the roof. Gypsum board or asbestos, gypsum in the bar of metal or gypsum board or plaster Furrer metal roof can be used successfully, depending on the tastes of the individual and the amount that can be expended.
It is recommended that any material to two feet from the top of a boiler or a furnace, or in the case of modern home saunas (where the steam of the sauna is not created by the rocks) and the infrared saunas at least be protected by a protective metal loose, willing to preserve an air space of an inch or two between the metal and wood.
The airspace can be provided by the use of small blocks of material between the metal and joists, or suspended sheets of metal in the wires or hooks fastened to the joists. If the can is used for a protector, you must have blocked connections because the connections are not reliable soldiers.
Similar protection should be placed on any partition of the woodwork or plaster and lath wood to four feet from the sides or rear or six feet against the front of any boiler, furnace or other heating equipment that can be found commonly in place of the spa if you have a sauna of steam or hot tub.
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