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Wannabe Geek


Topic # 161851 21-Jan-2015 18:36
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I have just received a quote for re-roofing our three bedroom house with colorsteel corrugated iron. At $9700 + GST it was a bit more than I anticipated. Perhaps it is the OSH regs mentioned in earlier posts.

On our roof there is a change of pitch of 6 degrees. There is a 5.2m length, a 6 degree change of pitch, thence another 2.7m. The roofer, on consideration, felt the best solution was to bend the iron at this join. I think his yardstick was that it is less than 8 degrees. He guessed, rightly, that it was.

Reading other posts here, whereby "Little dents become holes, holes become splits through expanding and contracting", I am a little concerned this may impact the life of the roof?

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  Reply # 1219397 21-Jan-2015 19:14
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I wondered the same thing, with a much steeper roof. The roofer I had told me not to bother, it wouldn't make it last any longer, he wouldn't do it if it was his house. It's made for specific circumstances, but I can't remember what they are. Just make sure you inspect after it's done, any significant scratches ask them to replace the sheets. Touch up paint is ok for small scratches.

On a thread I started about roofing others made plenty of comments and linked to the code of practice.




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  Reply # 1219439 21-Jan-2015 20:15
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Where do you live? We looked at it a couple of years ago and for us (Wellington) and apparently the salt was the big factor. We lived far enough away from the beachfront (Berhampore) that the thinner stuff (Endura?) was fine. No idea about the bending stuff, sorry.

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  Reply # 1219490 21-Jan-2015 21:34
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Yes, as I recall, Salt is the deciding factor in whether you use Maxx or not.  We are in a coastal area, so it was definitely advisable for us.





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  Reply # 1219512 21-Jan-2015 21:55
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Corrugated roofing should have a minimum pitch of 8 degrees. If less you are supposed to use a different profile. I would be surprised if the manufacturer would warrant it otherwise. 

You are right in regards to bends in sheeting. If gradual or curved it is not quite the same issue.

At the change of pitch upwards you should form a clean break in the sheets and have a transition flashing installed that laps under the higher roof sheet at least 200mm with a turn up or hem at the top of the flashing. The flashing should lap 100mm over the lower sheet. The high end of the lower sheet should also be turned up beneath the flashing. Depending on your wind zone you may need profiled closure strips between the flashing and sheets.

Maxx is necessary in a sea spray zone otherwise Endura will suffice. However, ask for the price difference between the two because if it is minimal then Maxx will last longer. If significant then stick with Endura. Sea spray zones used to be defined as within 500m of the shore (straight line of course). However, places like Wellington sea spray can travel much further.

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  Reply # 1219623 22-Jan-2015 00:46
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Agree with Gazbo

Also consider how strong the wind gets where you are. After the Hobsonville tornado. I was told that the thin 0.4mm corrugate just got ripped straight off the roofs. The Tek screws were still there, But the iron was just too thin. And I definetly would not want to use corrugate at a lowish pitch if it is an exposed area of roof.







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  Reply # 1220366 22-Jan-2015 20:30
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gc23: I have just received a quote for re-roofing our three bedroom house with colorsteel corrugated iron. At $9700 + GST it was a bit more than I anticipated. Perhaps it is the OSH regs mentioned in earlier posts.

On our roof there is a change of pitch of 6 degrees. There is a 5.2m length, a 6 degree change of pitch, thence another 2.7m. The roofer, on consideration, felt the best solution was to bend the iron at this join. I think his yardstick was that it is less than 8 degrees. He guessed, rightly, that it was.

Reading other posts here, whereby "Little dents become holes, holes become splits through expanding and contracting", I am a little concerned this may impact the life of the roof?


Just to add, the pitch of my roof goes from 16 degrees to 10 degrees = 6 degrees difference. 

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