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TOPIC: Standing Seam roof

Standing Seam Fastening Systems

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I first want to thank the experts for the 1000's of replies on here. I think I've read most of them. I hope I'm not duplicating the question but probably am. I have a question about different methods of fastening down the seam on the Standing Seam panels. There seem to be two different fastening systems, clips that are screwed to the decking and the panel clips onto the bracket. Or the panels are screwed down right alone seams sloted edge. What do you think is the better system? I figure the clips will expand more. Will the direct fasten system provide the same expansion/contraction results. Longest panel I'm looking at is around 31'. Please tell me your honest thoughts, not the generic Alliance reply affraid to lean toward one method or the other. You don't want to offend different manufacturers. But seriously, is the direct fastening system a proven method to aviod oil canning or buckling no worse than the clips? Thanks
Guest User

9/12/2006
A clip system is harder to "mess up" during installation. It also will be more forgiving of uneven roof decking. It also will allow for greater expansion and contraction. Todd Miller
Todd Miller
Isaiah Industries, Inc.

9/13/2006
Damm, I knew you were going to say that. I was starting to lean toward direct fastening because there was a panel that I liked. But it is only available w/ direct fastening. On goes the looking. Thanks for the reply.
Guest User

9/14/2006
If your roof is fairly simple, does not have real long rafters, and the deck is flat, a nailflange panel could work very well. It just depends upon your exact situation. Todd Miller
Todd Miller
Isaiah Industries, Inc.

9/14/2006
Because of your location, the local building code will dictate a very high uplift resistance requirement. "Typical" nailstrip type standing seam panels may not be strong enough to resist the wind pressure. A concealed clip standing seam panel will more than likely be stronger and it will probably have to be a field seamed panel as opposed to a snap together panel. I would recommend you discuss this issue with manufacturers of either type of panel for their input on the wind resistance of the product. Also, nailstrip panels will have a minimum roof slope requirement. Probably 3/12, but you can qualify this with the manufacturer as well.
Guest User

9/25/2006
Number of factors to consider. Metal expands and contracts with heat/cold. This is a consideration as the sheets become longer. Most snap lock panels with nailing flanges have slotted holes to allow the sheets to slide and not pinch. Most clip fastened systems are mechanically seamed after installation which hemms the sheets laps together providing a stronger connection and use floating clips to provide expansion and contraction. One needs to follow the manufacturers instructions on "Pinning" the roof sheets as some are fixed hard at the ridge and some at the eave. A mechanically seamed roof system typically has better hydrostatic properties and can be used at lower slopes. There are many other factors such as type of material ie Aluminum, Galvalume and Galvanized as example that all have differant strength properties. Last is that the High Velocity Hurricanne Zones as outlined in the FL building code have specific wind load requirements by location, building height, roof configuration etc as to wind loads that must be met. This means severe wind uplift testing and approvals. Ask to see the product approval which will incude specific fastening instructions and a maximum pressure allowed.
Allan Reid
Dura-Loc Roofing Systems, Inc.

9/26/2006