Fixing Galv. Corrugated Iron - not boaty but Pratical

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PetiteFleur

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Bought some Galvanised corrugated sheets today to replace the C*** Onduline sheets on my shed ready for fixing of PV panels and had a discussion with the dealer as the best way to fix to the purlins - he said use 25mm Tek? screws in the valley and I said I understood they always had to go on the crest so they could not leak. Eventually decided on 65mm Galv spiral large head nails + plastic washer for the crest and I'm now having doubts about these.
What is the forums opinion? I'm tempted to go back and swop for the Tek screws.....
It's standard Galv. corrugated sheeting 0.5mm thick.
 
If they are corrugated.ie round section sheets (known as wriggly tin) you should use the long spiral nails with plastic washers on the crest.
The roof will leak if you put fixings in the valley,as you can't get the seal tight enough.
 
Tek screws.

You need to drill a tiny hole first, say 2mm, and then the self-tapping Tek just slides in.

Worth getting the adapter for the screw head; it's magnetic.


Proper job.
 
Just use galvanised spring head nails which you hammer straight through the tin on the ridge tops, no need for drilling. Time proved and tested.
 
Always on the crest. Nails work but come loose after 10 years. Also not as quick or easy as screws. If you miss the nail you leave a dent in the roofing which can lead to leaks. I recently used 700 screws to refasten the roof on our beach house. 65mm galvanised hex head. They have a small rubber washer and a drill bit on the end. No need for a starter hole or punch if you use the magnetic socket in the drill as the sharp end of the screw makes its own dimple.
 
After years of pithing around on my Farm with corrugated tin sheets I discovered "Box Profile Sheets" which are far superior. Say you are doing a roof which is 14ft deep by 14 ft wide, with corrugated sheets you have an overlap half way down, whereas with Box Profile you order them the depth of your building, with my last roof 14ft long, 5 sheets wide. Screw down. Job done 2 hours.
I have even bought them 22ft long.
 
Thanks everyone - I will probably stick with the spring head nails I eventually decided on as they didn't have any 65mm Tek screws in stock.
Jim@sea - like the box profile you can now get galvanised corrugated in any length youi want, in both 0.5 and 0.7mm thickness.
ytd - that was what I intended to use but they had run out of 65mm so settled for the traditional spring head nails
Regarding Tek screws in the valley, the guy said when he was installing roofs they always did it like that which is what confused me.
 
Ridges or Valleys?

I always understood that fixing should be on the ridges for roof sections but in the valleys on walls.

On the roof, you do not want holes in the valleys as that is where the water will be running. On the walls the valleys are less exposed to driving rain.
 
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