If you enter a building like this with heavy fire then it is as important to get water above you on the roof members from the inside as it is to get water at the seat of the fire.
Main hazards for fire firefighters with gable roofs.
The two major fire department concerns with green roofs are the added weight to the roof and difficult vertical ventilation.
Firefighters operating on the roof will add to the live load of the roof.
Ventilation allows the chemicals smoke and heat evacuate out.
A very dangerous style of roof for firefighters responding to fires is the mansard style roof.
Mansard roofs wrap around exterior division walls allowing fire to spread in the cockloft.
Pitched roof ventilation can be one of the most hazards operations on the fireground yet it is one of the most important assignments.
From the top down fires ignite under wood roofs by means common to any structure fire.
The void space created by a bowstring truss can allow heat smoke and fire conditions to go undetected causing a false sense of security for firefighters operating beneath it.
Also the hole size depth and location can also lead to premature collapse.
In addition some lesser known hazards are pocket doors window transoms laundry chutes tin ceilings metal roofs and combustible varnished wall coverings.
The larger problem with wood roofs is that fire can ignite due to embers or brands.
When considering roof operations roof pitch.
The roof team can report rapid fire smoke changes victims at windows side c property hazards and changes in elevation between side a and c the members operating on the roof should read.