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PostPosted: Fri Sep 15, 2017 9:24 pm 
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Hi Folks,

a bit of advice if you could please.

I have removed felt from my garage roof and I'm replacing with breathable membrane over sarking then corrugated painted metal sheet on top.

The corrugated sheet is 0.5mm thick 1.8m x 1m.

It was supplied with 100 of 60mm x 5.5mm screws and 50 25mm x 6.3mm stitching screws.

I have watched quite a few videos but I'm a little confused as the best way to attach it screw spacing wise.

I understand that screws should be laid in vertical not horizontal rows and that the seams should go away from the average wind direction, they shouldn't be overtightened to snag the washer, after that I'm a bit lost.

How many screws does it need per sheet?


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PostPosted: Sat Sep 16, 2017 8:21 pm 
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screws go in horizontal
in this situation i would recommend putting them on battens along the roof to give it some breathing spaces they don't sit wet underneath.
you could put a rail top and bottom but i would also add one to the middle
fix every trough/pan (the large flat bit bottom ) not the crowns (the peak of the sheet ) on the bottom and top rails and every other one on the intermediate railf
stich each sheet every 600mm up the join and its best to put as sealant first
there is a left and right roll to start ,
hope ihavnt confused you


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PostPosted: Sun Sep 17, 2017 9:38 am 
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I have only seen in Asia and here we put the nail or screw through the peak (if in trough sure to leak); the old roof has wood below; blue steel about 8yrs and galvanised about 3yrs unfortunately they did not use a rubber washer only the nail!
The newer composite roof 2yrs, has steel sub and hence the hex screws and we put the larger metal+rubber washers, disgarded the small ones that came with screws.
The length overlap on very corrugated was 2 and on the blue steel only one, fixing 4 across near bottom and top (about 200mm from ends) with outer ones in overlap peak as stitching not used. Torrential rain and very strong winds are normal here.


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PostPosted: Sun Sep 17, 2017 6:13 pm 
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Thanks, I spoke to our roofer as well, I've gone with screwing the peaks as indeed troughs would leak.

Very happy so far but rain came on before I got the ridge finished - typical Scottish weather!


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PostPosted: Wed Sep 20, 2017 5:57 am 
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you screw through the troughs to prevent spreading the sheet and movement
but what do i know I'm only an industrial roofer with 30 years experience
look at anty industrial building or try southern sheetings website for how to tips


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