Why firefighters and fire codes are important 💪 #firefighters #firecode #carpentry #building

A thousand US houses burn down every day. It takes as little as 5 minutes for a house to be fully engulfed in flames. This is why firefighters have to act so fast in a fire. When a fire starts in a house, there's limited visibility. Firefighters have to create vertical ventilation to allow the smoke to rise and clear out the space. Here's a joist bay and we have the first floor and the second floor. When there's no blocking and a fire starts on a lower level, this heat allows this to rise and come out in higher floor levels. If a fire starts and you install blocking, blocking helps contain the fire to the first floor. Another common place is your vent. If a fire starts in the basement, this can cause a fire to go up your stack and into higher floors without being recognized. Here's an example of a roof with OSB. Rafters will typically run from the top of the ridge all the way down to the bottom of the bearing wall. Rafters are often 2 by 6s or bigger, but if it's a truss, it could be as small as a 2 by 4. A roof will typically have OSB, a layer of synthetic felt, and a layer of shingles. In some cases, you might even have two or three layers of shingles. It's not uncommon for synthetic felt to get clogged in the chainsaw. When you make your cuts up here or down here, when you cut, you want to be sure that you don't go too deep. You want to be sure you're not standing on the rafter you might cut. When you make down cuts, you want to be sure you're not standing somewhere that you could fall through. Trying to pry [clears throat] off a large sheet can be very difficult. This is because there's fasteners spanning across these three rafters. If you make more down cuts, you can easily hit these and open them up. If you accidentally cut these rafters too deep, if you stand behind or on the rafter, you could fall through like this. This is just [snorts] a demonstration and all structures are different. Thanks for watching.