Roof Design With Firewall

Fire walls shall have sufficient structural stability under fire conditions to allow collapse of construction on either side without collapse of the wall for the duration of time indicated by the required fireresistance rating or shall be constructed as double fire walls in accordance with nfpa 221. In fact section a33146. Fire rated walls and their parapets are designed with a fire resistance rating and structural stability and to separate buildings or parts of buildings to prevent the spread of fire.
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As you can see this plan is also based on marcelino classic 4 bedroom house plan only that the right side wall has no opening or it is fire walled.

Roof design with firewall. Johanne model is 2 story house plan with firewall perfectly fitting in a 10 meter width lot and a total lot area of 160 square meters. To prevent fire spread around a firewall firewalls in conventional combustible or non combustible buildings generally require parapets vertical extensions through the roof. Continuously from the foundation to or through the roof with sufficient structural stability under fire conditions to allow the collapse of the existing construction on either side of the wall to occur without allowing the collapse ofthe wall. If yes this design is perfect for your lot.

So basically a firewall creates separate independent buildings. In certain cases horizontal offsets in a firewall may be required which require special design consideration to ensure structural stability of offset firewalls in particular.