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TOPIC: Corrugated Roof

Cutting Corrogated Roofing Sheets

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I have to make a round hole in the center of a sheet of corrogated roofing. What is the best tool for a clean cut through galvenized metal - I have a rotary tool - if this would work, what type of bit would work best
Guest User

9/26/2002
This is one time you don't need more power. You do not want to cut metalic coated steel with a rotary action as it leaves burrs of hot metal that rust and damage the surface where they land and second is that it opens up the edge of the steel core to rust. Any tool that has a shear action is recommended. They do make power shears and power nibblers but they are a considerable investment. The old failsafe way is to take a blade screwdriver and hit it with a hammer in the centre of the cut out to make an initial opening. Then just use a sharp pair of metal snips cutting circular to the outside circumference that you karked out.
Allan Reid
Dura-Loc Roofing Systems, Inc.

9/27/2002
This pole barn was framed up for several months with out any roofiing installed, the building is out of square at the top causing the R-panels to run uneven at the bottom which has to be trimmed, which is the fastest and best way to trim the excess with out using nibblers ! Can this be performed by using a power saw with a metal cutting blade , Thanks
Guest User

12/25/2002
This pole barn was framed up for several months with out any roofiing installed, the building is out of square at the top causing the R-panels to run uneven at the bottom which has to be trimmed, which is the fastest and best way to trim the excess with out using nibblers ! Can this be performed by using a power saw with a metal cutting blade , Thanks
Guest User

12/25/2002
You need to avoid a saw for two reasons. One, it leaves a very rough, raw, rust-prone edge. And, two, it creates shards of hot metal which can imbed themselves into the paint on the panels and then rust. You need a shearing action to create a good cut. This can be achieved either through a guillotine set up for your panel profile or by using hand shears ("tin snips") or a power shear.
Guest User

12/26/2002