Straight Valley Cuts with Shears

Brad C
10/31/2017
Hi, I am making great progress on my roof and have 3/4 of the roof covered with the PBR panels. I am now to the point where I have to cut the valley angles into the PBR panels. I have a pistol grip air shear (https://www.harborfreight.com/pistol-grip-air-shears-98580.html) for cutting but and a little worried about the angle cuts using this tool, is there a better option to cut the angles into the PBR panels and ensure they are straight? A circular saw? Clamping a 2x4 to the panel and using it as a guide for the shears? Any other ideas? I want it to look good. Thanks!
Info @windowsonwashington.net
An informed customer is our best customer.
10/31/2017
You can snap your lines and still do them with the shears. As long as you follow your line, you should be fine. I would just get a set of electric shears as they tend to be a bit more controllable to me.
Brad C
11/1/2017
My goodness, I have to say cutting these angles for my dormer valleys into the PBR panels is a NIGHTMARE! I tried the air shears and they cannot get over the ribs; andy snips and they work for the little ribs and flat areas, but are worthless on the PBR's large ribs; the aviation snips dont leave a clean edge... This is one of the most frustrating experiences I have ever had. Are there any "trade secrets" to cutting angles/mitres into the PBR panels?
Info @windowsonwashington.net
An informed customer is our best customer.
11/1/2017
If you have more than a few angle cuts to make, set up a cutting table out of a piece of plywood and some 2x4s that will act as a fence (they sit on top spaced up on some 2x4 blocks. Get a Tenryu metal saw blade for your circular saw and you can trip right through the panels. If you set up your cutting table with the regular angle of the valley, all you have to do is mark your start point of the cut and you can fly through them.
David Stermer
11/1/2017
Thanks for your use of metal roofing. When using a saw to cut metal panels, it is important to protect the panels from the filings cut by the circular saw - the panels being cut and other panels in the vicinity. I can't tell you how many times I have seen pictures of panels with rust spots all over, that came from allowing the hot metal 'saw dust' to land on the panels. This damage often takes a bit of time to show up and the best remedy is panel replacement.

If you would like to reply to this thread, please log in. If you do not have an Ask the Experts forum user account, create one here.

Find a Contractor

Get Started Today

Take the first step to increasing the value of your home with a great looking, durable, fire resistant and energy efficient metal roof. Browse our list of qualified MRA Member Roofing Contractors in your area for a free consultation and estimate.