Rake On Metal Roofs

mattp

I'm bidding a metal roof on a straight shot gabled roof 34' pieced 90' across. The only problem is the gabled ends get wider at the top. How does one go about putting his rake over the ridges on the metal, it won't lay flat because the ridges doesn't run with the gable.

benchmark2323

it means your roof is out of square. get some cains and comalongs and pull your purlins square. measure from your fascia board to opposite side at the ridge. you may have to bust nails at your first bay to get it square. once square you should be able to figure out how to lay out your steel so the ribs are under your rake

mattp

I'm guessing that is a joke. the overhang gets wider as it goes up nothing is out of square it was the style.

joasis

Interesting way you describe the roof, but what I am getting is the overall width is 34 feet? Which gives you a slope of 17'? Anyway, the length is unimportant. Your issue is the roof is "longer" at the ridge, then at the eaves, correct? This was an architectural style popular in the '70s around here. We either do a custome trim line for the rakes or, we notch the rakes to fit the ribs in the steel exactly, and seal with 50 year clear silicone. The custom trim is your best option, and while it is expensive, makes a great looking rake line.

I am not savy enough to draw on the post, but if you will follow my description on a piece of paper, you will get the idea.

Start at a point, move vertically up 1 inch, then 45 up and left 3/4", then vert. up again 4 inches, then to your right on a horizontal 3 inches, then return (hem) back left 2 inches, then down vertically 3/4", then back right 6 inches. This will give you a rake that will let the ribs "tuck" into the channel and hide the cut line, plus allow drainage down the channel to the eave. Good luck.

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mattp

The slope is 34' and 90' overall width. Yes the roof is longer at the ridge than at the eave. Thanks for the adivce.

mattp

Not so sure I could make that. What do you use to bend your custom piece with. If I was just to notch them would you use silicone or butyle rubber

joasis

Any steel suplier that advertises custom trim can make the pieces you need, usually in any practical length up to 21 feet long. They slit a coil, and then using a CNC leaf type brake, bend the custom profile. This is not something you will do in the field, and if you choose to notch the rakes to fit over the ribs on the panel, seal them with silicone, and seal them well, if not, you will have water behind the rakes, and that will promote rot of the rake boards. Not good. That is why I strongly suggest you get custom trim made. I don't know where you are from, but chances are Mueller or MBCI is in your area, and they can do the custom trim.

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AaronB.

Good advice, Joasis.

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pgriz

For the metal roofs we do, we have a standard set of profiles that fit 90-95% of the situations. These are made up at the shop. For the rest, we always have flat stock in the crew truck along with a 10ft. aluminum brake. All the installers know how to make up profiles from scratch. Saved us a ton of time over the years when we find "surprises", and there are always a few on older homes and homes with various "improvements and additions".