Roof Cutting Holes

Keep these pieces safe for use later.

Roof cutting holes. Determine the length of the void ideally in 3d view at wireframe mode extend this in order to. Cutting oval holes in a sloped roof for round pipes when plumbing pipes and chimneys have to go through sloped roofs they are always cut fairly large just to make sure that the pipe will pass through. For a roof vent this means cutting a hole in an otherwise watertight roof. Create an in place family roof at choosing void extrusion.

The problem is that a 3 inch round pipe needs an oval hole in a sloped roof. It is better and safer to cut one hole and enlarge it then cut several smaller ones. Cutting through the tar material and sheathing will typically require a depth of 1 to 1 1 4 inches. Calculate the number of panels needed for the roof.

A bit of careful planning can take some of the fear out of this task. Once the roof has its shingles removed you can begin cutting. Find a stable surface like a workbench you can use. Remove any drywall from the inside and then cut through to the outside of the roof.

Lay the roofing sheets on a flat surface with the underside up. Ideally in a section view draw the contourline of the void using the pick line option on the base of the inside edge. When cutting your ventilation. Marking the metal for cutting 1.

Measure along the. Putting your vent into the middle of the roof requires that you remove any tiles or slate that may be damaged when you make the hole. 3 hold the saw s blade 1 inch above the roof remove the blade guard and depress the trigger. If you haven t already determined how big the panel needs to be.