| Author |
Message |
Mark R. Jones, CCS
Junior Member
Username: mrjones
Post Number: 2
Registered: 08-2010
| | Posted on Monday, August 23, 2010 - 06:51 pm: |    |
I'm working on a new entrance canopy for an existing senior apartment building and I'm wondering if anyone has some suggestions for the roof covering material. The canopy is concave shaped and the slope varies with an approximate slope of 1.5 to 12. The size is approximately 12-feet wide by 25-feet long. I was originally thinking of using a flat seam aluminum metal roof but my initial research shows that aluminum flat seam isn't as common as standing seam and copper is used more. Because of the concave curvature on the top of the canopy (the bottom is convex) I'm not confident the metal and substrate can be curved adequately even though it is a shallow curve. The structure is steel.
Is a membrane roof better to accomodate the concave curve? If so, what type of membrane roof? Can a flat seam metal be curved in a concave shape if it is shallow enough? The bottom of the canopy cannot have exposed structure or decking to minimize pigeon roosting and maintenance. |
John Hunter
Senior Member
Username: johnhunter
Post Number: 80
Registered: 12-2005
| | Posted on Monday, August 23, 2010 - 08:12 pm: | |
Take a look at Sarnafil's colored roofing membranes: http://www.sarnafilus.com//colored_membrane_rp.htm. They can be installed fully-adhered which will eliminate exposed fasteners and they have battens that can be heat-welded to the membrane which might provide some scale to the installation. |
Tim Werbstein, AIA, CSI, CCS
Senior Member
Username: tim_werbstein
Post Number: 28
Registered: 09-2006
| | Posted on Tuesday, August 24, 2010 - 08:17 am: | |
Successfully seaming difficult shapes is very dependent on the skill of the worker. Thinner metal helps too; and such roofing would be "architectural" (fully supported), not "structural" (spanning between purlins).
I would get advice from a likely local installer.
Among "white" metals, you might also consider zinc or zinc-tin alloy coated copper ("Terne" by Follansbee). Aluminum does not solder easily so it would be a poor candidate for a flat-seam roof, which is typically soldered. |
(Unregistered Guest)
Unregistered guest
| | Posted on Wednesday, August 25, 2010 - 10:02 am: | |
These are helpful. Thanks. I may also look at translucent canopy systems such as CPI. |
Sheldon Wolfe
Senior Member
Username: sheldon_wolfe
Post Number: 429
Registered: 01-2003
| | Posted on Wednesday, August 25, 2010 - 06:10 pm: | |
Is it too late to consider a fabric canopy? |
John Bunzick, CCS, CCCA, LEED AP
Senior Member
Username: bunzick
Post Number: 1233
Registered: 03-2002
| | Posted on Thursday, August 26, 2010 - 09:26 am: | |
Or a flat-lock seam metal roof, using terne 2 coated copper or stainless. All seams are soldered in this type system. |
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