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Sprinkler needed for attic bedrooms.
These can be expensive particularly if your mains water pressure is low and water storage is required.
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So even where nfpa 13r would allow the omission of attic sprinklers sprinklers might be provided to eliminate the need for attic draftstopping.
Many councils will now accept a small sprinkler system as an alternative to the above protection requirements.
Nfpa 13 installation of sprinkler systems the standard for the installation of automatic sprinkler systems never specifically addresses whether or not an attic requires sprinkler protection.
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In past years confusion in this area often led to change orders adding attic sprinklers to nfpa 13r systems.
Careful planning at the early stages of a conversion is worthwhile.
The attic is required to have fire sprinklers or the attic can be constructed of fire retardant treated wood or of non combustible materials or filled entirely with non combustible insulation.