The Cuts

There are many types of cuts, and we will discuss a few. But the main objective is to release the heat, smoke, and toxic gasses. To do this your hole size needs to be big enough to make a difference. Unfortunately, the day of the 4x4 hole is over. This size just doesn’t release the amount of heat needed to be effective. With all the synthetics and plastics in today’s homes, and the rate of heat release these products produce, it just makes sense to make the hole larger. You may not find this in many books, but from my experience and the experience of other like-minded Firefighters I network with; we agree that at least a 4’x6’ hole is the new minimum.

There are many ways to accomplish this size and larger hole. I am a big fan of two cuts. The Louver cut and The Milwaukee cut. Each has their place. Now there are many more to consider but these are the two I am going to talk about.

THE LOUVER CUT

A two panel louvered cut on a residential roof will provide an opening that is about 4x8 foot. Starting at a high point, near the ridge and working your way across the top. Start your cut by plunging your saw into the roof, slide the saw to the left until the resistance is greater. This means you have hit the roof rafter. Now slide the saw in the same kerf cut to the right until that heavy resistance is meet again, now roll the rafter. To roll the rafter, you lift the saw out of the roof material and cut just the sheeting not the rafter. Then as you have gone over the rafter plunge the saw again until the next rafter. Continue this for process. Cut, roll the rafter, cut, roll the rafter, and cut to the rafter. This will give you about six feet in length. Now cut downward toward the soffit, about four feet. If you’re unsure how far four feet is, count rows of shingles. Each row is about six inches. That’s a foot for every two rows. Cut down eight rows. Now work your way back. Same cut and roll method. This time after you roll the rafter, stop. Reach up to the top cut, make a cut from your top cut to the bottom cut. This should be half way between the rafters. Continue working your way back to your roof ladder. Make the last vertical cut and now wait for the word to open up. Punch through with your six-foot hook, the roof material will “louver” on the rafter.

After the cut is made do not forget to punch through the ceiling material to allow for proper ventilation. As soon as the cut has been made, firefighters should evacuate the roof as quickly and as safely as possible.

THE MILWAUKEE CUT

The Milwaukee cut is a great cut that catches all aspects of your roof. It runs from the peak to the soffits. It is usually around four feet wide. To start the cut is just like the start of your louver cut. The only thing I would add is an inspection cut at the top left and right. This becomes important when you are ready to pull the material from the cut. As this allows you to get the hook into the material and pull. I should add that it can be done with a rotary saw as well as a chain saw.

This cut is labor intensive. It can be done with two Firefighters but 3 is optimal. You will need two roof ladders, one on each side of your cut. How you accomplish this cut is up to you. Meaning that you can run two saws or one. But I like the old adage that two is better than one.

Either way, after making your cut across the top and then making your inspection hole, continue the vertical cut all the way to the soffit on both sides.

Climb back to the peak and begin pulling the material from the cut. Again punch through the ceiling material.

The advantage to this cut is in a lot of New England homes there are many voids in the roof area. Especially in Cape Cod style homes. With the attic space above and the knee walls all open this allows you to properly vent the whole structure

SAFETY CONSIDERATIONS

Pitched roof ventilation can be one of the most hazards operations on the fireground, yet it is one of the most important assignments.

There are numerous things to consider when working on a roof. Number 1 the fire is under you! Sounding the roof is a must, know and understand the sound of a solid and a spongy roof. Know that in older homes the ridge and valleys are usually the strongest, but still sounding is a must.

Use a roof ladder whenever you can. Yes you can walk a pitch of 6/12 or less but err on the side of caution. If you cannot see, meaning heavy smoke conditions, then get on your knees. When you have an SCBA on you have balance issues, add a pitched roof and low to no visibility, this could be a bad combination. Always try to work your way back to your roof ladder. This may not be able to be done 100% of the time but do it as much as you can. Know the signs of a bad roof. Bubbling shingles, smoke slithering from under shingles or through metal roofing. Any sags in the roof or in between the rafters. Understand building construction, especially roof construction. Understand what types of roofing material is on the roof, how many layers of shingles and sheeting material. If you are unaware of the construction type, then cut inspection holes. This may save you some time and may even save your life.

Mother nature is always messing with us. From snow to sleet to freezing rain. Be aware of these conditions and take appropriate actions. Use of a roof ladder even on a low pitch is a good start. Some type of striking tool, should already be in your tool selection, to break away the ice, maybe add a shovel as well.

Get out in your community and see what’s out there! Because you don’t know what you don’t know!

For more, check out Ryan Johnston and MAINE-IAC Training. www.maineiactraining.org

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