5:05 The first cut of your 45 degree inspection hole, the one you use to find the rafter, can also be done using a "back cut." Plunge your saw blade down vertically and cut in the opposite direction from what you'd normally cut. The blabe cuts less efficiently in this direction, but it makes finding the rafter easier, because you'll feel the resistance more easily than if you're cutting in the normal direction and you have a freshly sharpened blade, which can slice right through rafters made of soft wood sometimes. I don't always use this cut, but it's a piece of knowledge to keep in your toolbox, especially when you're unsure of the rafter direction on a flat roof in either Type 3 Ordinary or on a rowhome fire, like what we have in Baltimore, some of which are from the 1700's and 1800's. Remember that your inspection hole can be a good starting point of your vent hole because it already gave you information on (1) rafter orientation, (2) smoke and fire conditions below, and (3) building construction. Although we can cut a vent hole separate from the smoke indicator/inspection hole, by using it as a starting point for our vent hole, we're working more efficiently.
The only problem with this is that the person cutting the hole DOESN'T understand building construction, DOESN'T know how to use a chainsaw and is probably name Caleb or Dylan.
You obviously know so much about firefighting and have been in the fire service for a very long time to know exactly what tactics we use and why we do things!
JB91710 I’m sorry, I’m not exactly sure if you’re being serious or not. Ever do a search/suppression operations in a structure with/without communicated and coordinated vert vent?
Andrew I never participated in one because even the Thought of it actually working is ridiculous If 0ne percent of American departments ever coordinated Vertical Ventilation with water application, I would be Truly Shocked. There are a Lot of cool things that sound great on paper, but if it takes intelligence, a strong work ethic and communication to get them done, it ain't going to happen in America. P.S. I Am an American! That's why I know!
Utilizing blanket statements to justify your own agencies inefficiency in field operations doesn't give you the right (or knowledge for that matter) to generalize every department in the nation. Being part incidents where these operations actually work, I just can't agree with that kind of opinion.
Andrew I am an Expert at the operation of fire boxes and chimneys so I know about air pressures and the requirements for heat to rise. I am a pilot so I know about air pressures. I Think using common sense and logic unlike the Vast majority if humans. With that said, I Know that cutting a hole in the roof of a burning building will Not allow the heat and smoke from the lower floors to flow up to the hole Just because Heat Rises! When you cut a hole in the roof, the smoke and flames coming out are NOT doing so because Heat Rises! Pressure caused by the fire inside the attic is being Released out the hole! When that happens, the gasses start moving and fresh air is drawn in from hundreds of little pin holes and leaks and mixes with the gasses and the fire increases inside the attic and even more pressure is created that the hole can not eliminate fast enough so in effect, you have created a high pressure area that will not allow smoke from below the ceiling to rise to the attic. Nothing will change on the lower floors and the fire will just get bigger. Watch 100 videos that shows roof venting and you will still see smoke exiting the front door, windows and even attic windows and vents. Nothing will change. You and the other 95%ers believe it works because Heat Rises and someone Told you it works! Period!
5:05 The first cut of your 45 degree inspection hole, the one you use to find the rafter, can also be done using a "back cut." Plunge your saw blade down vertically and cut in the opposite direction from what you'd normally cut. The blabe cuts less efficiently in this direction, but it makes finding the rafter easier, because you'll feel the resistance more easily than if you're cutting in the normal direction and you have a freshly sharpened blade, which can slice right through rafters made of soft wood sometimes. I don't always use this cut, but it's a piece of knowledge to keep in your toolbox, especially when you're unsure of the rafter direction on a flat roof in either Type 3 Ordinary or on a rowhome fire, like what we have in Baltimore, some of which are from the 1700's and 1800's. Remember that your inspection hole can be a good starting point of your vent hole because it already gave you information on (1) rafter orientation, (2) smoke and fire conditions below, and (3) building construction. Although we can cut a vent hole separate from the smoke indicator/inspection hole, by using it as a starting point for our vent hole, we're working more efficiently.
very interesting
The only problem with this is that the person cutting the hole DOESN'T understand building construction, DOESN'T know how to use a chainsaw and is probably name Caleb or Dylan.
I didn’t know firefighters only learn how to destroy your rooftop...instead using water to putout firer ...lol
You obviously know so much about firefighting and have been in the fire service for a very long time to know exactly what tactics we use and why we do things!
Making these can holes prevent your home from blowing up. & limiting the fire from spreading
It's interesting that I can't find ONE video that Proves that Vertical Venting works! All I see are videos that show how to cut a hole in the roof.
JB91710 I’m sorry, I’m not exactly sure if you’re being serious or not. Ever do a search/suppression operations in a structure with/without communicated and coordinated vert vent?
Andrew I never participated in one because even the Thought of it actually working is ridiculous If 0ne percent of American departments ever coordinated Vertical Ventilation with water application, I would be Truly Shocked. There are a Lot of cool things that sound great on paper, but if it takes intelligence, a strong work ethic and communication to get them done, it ain't going to happen in America. P.S. I Am an American! That's why I know!
Utilizing blanket statements to justify your own agencies inefficiency in field operations doesn't give you the right (or knowledge for that matter) to generalize every department in the nation. Being part incidents where these operations actually work, I just can't agree with that kind of opinion.
Andrew I am an Expert at the operation of fire boxes and chimneys so I know about air pressures and the requirements for heat to rise. I am a pilot so I know about air pressures. I Think using common sense and logic unlike the Vast majority if humans.
With that said, I Know that cutting a hole in the roof of a burning building will Not allow the heat and smoke from the lower floors to flow up to the hole Just because Heat Rises! When you cut a hole in the roof, the smoke and flames coming out are NOT doing so because Heat Rises! Pressure caused by the fire inside the attic is being Released out the hole! When that happens, the gasses start moving and fresh air is drawn in from hundreds of little pin holes and leaks and mixes with the gasses and the fire increases inside the attic and even more pressure is created that the hole can not eliminate fast enough so in effect, you have created a high pressure area that will not allow smoke from below the ceiling to rise to the attic.
Nothing will change on the lower floors and the fire will just get bigger. Watch 100 videos that shows roof venting and you will still see smoke exiting the front door, windows and even attic windows and vents. Nothing will change. You and the other 95%ers believe it works because Heat Rises and someone Told you it works! Period!
@@JB91710, once you call yourself a expert you get full of yourself. No ones a expert you either have a lot of knowledge or non