Lath is what Firefighters use when the put tar paper or plastic sheathing over the windows they have removed or the holes they had to cut to be able to get inside and extinguish the fire. Those patches often last for 6 months of more in all kinds of weather.
In case you've ever wondered why firefighters break the windows and / or cut holes in the roof, it is to release the super heated gasses that the fire has produced. Entering that super heated environment without reducing the temperature would be fatal in a few minutes even to a firefighter wearing full protective clothing and breathing air from a Self Contained Breathing Apparatus (SCBA). By releasing that very buoyant super heated gas from the structure they make it possible to go inside and extinguish the fire before it can spread throughout the rest of the structure. No holes would mean no entry and you only stay outside when the structure is really well involved in fire and there is no chance that any of the rooms have a survivable environment.
"We will risk a lot to protect a savable life, we will risk a little to protect savable property, we will not take any risk to protect lives or property that are already lost" RIP
Chief Alan Brunacini then commanding Phoenix Fire Department.
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Tom Horne