Colorsteel ridge capping with alloy edging

Forums › Home Workshop DIY › Colorsteel ridge capping with alloy edging - how to dress it down?

geekIT

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#282601 28-Feb-2021 16:18

Okay, so it's around 50 years since I last roofed a house, but the ridging then was lead-edged.

The capping I got from a local roofing contractor to finish a recent roof repair is alloy edged. It doesn't seem to stretch as far as lead did.

Whats the secret to dressing this stuff down into the corrugations?

BTW, I've turned up all the sheet ends, so driving rain shouldn't get too far.

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Jase2985

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#2665817 28-Feb-2021 17:16

when they did my roof they just used the wooden handle of a hammer to push it down to the corrugations.

geekIT

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#2665832 28-Feb-2021 17:41

Yeah, that was how we used to do the lead-edge stuff. But the aluminum doesn't stretch like lead. Maybe I need to push it harder.

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Jase2985

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#2665859 28-Feb-2021 17:57

it doesnt seem to stick out as much as older stuff does

mdf

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#2665882 28-Feb-2021 18:38

Use softedge - like this: https://edgingsystems.co.nz/ez-edge/

nickb800

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#2665889 28-Feb-2021 19:10

There's a round rubber attachment that fits over a normal hammer. Don't know the name sorry

geekIT

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#2667833 4-Mar-2021 16:54

Headsup: After much messing about, I found that alloy does dress down into the pans - it's just way more tedious and laborious than with lead. If I was still building houses and doing my own roofing, I'd skip alloy-edged ridging for a less troublesome alternative.

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antoniosk

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#2667937 4-Mar-2021 20:47

mdf: Use softedge - like this: https://edgingsystems.co.nz/ez-edge/

Yep this seems to be the current standard. tbh i don't like the look of it once it starts aging and gets detritus stuck in it.

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mattwnz

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#2667944 4-Mar-2021 21:17

It has been around for a long time. Doesn't look as good as the older lead ones which we had installed on our house in the 80s with a normal galvanised steel roof.

geekIT

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#2669569 7-Mar-2021 17:55

Footnote: Ridging isn't intended to be a totally tight seal. The idea is that your roofer should turn up the troughs of the top end of the sheets with pliers or a spanner or similar, ensuring that when water gets under the ridging (as it will) it can't flow over the turned-up sheet ends and therefore runs back down again.

Actually, if ridging was a near-perfect seal, the cavitation effect of wind passing over the ridging would drop the air pressure under the ridging and actually suck the water inside. This is exactly what happens when someone tries to seal up every cavity, lap, tiny hole etc, in an old roof. Then, being almost airtight, the roof cavity drops in air pressure, due to cavitation, and actually sucks in water through every minute cavity. Capillary action also contributes to this phenomenon.

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