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jim deflorio
10/26/2005
I will be installing a metal roof over existing shingles. I plan to strap the roof at 24" intervals. The house in question is located in central Ontario, Canada. I have had some people tell me that screws should be placed on the high part of the metal (the ridge), and have had some tell me that placing the screws on the flat part of the metal is easier and will not result in any leaking problems. Where do you recommend that the screws be placed. Thanks for your help. Jim
Allan Reid
Dura-Loc Roofing Systems, Inc.
10/27/2005
Well I recommend contacting the manufacturer and get their recommendations. Certainly material thickness, deisign and snow loading will have an effect. Also most important is shjeet length and expansion. The longer the sheet, the more thermal movement and certainly fastening in the highs deals with this. Best to lay out and predrill the sheets where possible so they are even and make sure you do not over tighten them as the seal will fail.
Guest User
10/27/2005
Thanks for the guidance Allan! I was planning on putting the screws on the lower, but I think you have changed my mind. The sheets will be 25' and 31' long and we do get quite a bit of snow at times.
Todd Miller
Isaiah Industries, Inc.
10/29/2005
Very good. All best!
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