| Author |
Message |
Jerome J. Lazar, RA, CCS, CSI, SCIP
Senior Member
Username: lazarcitec
Post Number: 1162
Registered: 05-2003
| | Posted on Monday, August 18, 2014 - 02:27 pm: |    |
So a client has proposed for storefront extrusions on a South Florida project to coat the exterior exposed extrusions with ESP Kynar 500 and the coat all the interior exposed surfaces with ESP Acrylic or Anodized. Sounds feasible, should save money, any one have thoughts on why this is not a good idea? Perhaps fabrication would be difficult? |
Dave Metzger
Senior Member
Username: davemetzger
Post Number: 526
Registered: 07-2001
| | Posted on Monday, August 18, 2014 - 02:33 pm: | |
Jerome, we've done this frequently, although using polyester enamel for the interior. In addition to saving money, polyester is a harder finish than is PVDF, and so is more resistant to abrasion which may be more likely to occur on accessible interior surfaces.
For application of a split finish system, the storefront profile must be a 2-piece extrusion, so each piece can be finished separately. A split finish isn't realistic on a 1-piece profile. |
William C. Pegues, FCSI, CCS
Senior Member
Username: wpegues
Post Number: 918
Registered: 10-2002
| | Posted on Monday, August 18, 2014 - 02:39 pm: | |
Jerome,
This is not uncommon at all. We see this all the time when the color on the exterior is not a color that blends well with interior colors, and a number fabricators do this, so its not a fabrication issue. I first started seeing this back in about 1984/85 when fabricator "Bruce" was moving into this region in a major way and it was one of their selling points - that it could save more overall.
Now its done most frequently for aesthetic reasons to get a more neutral color on the inside surfaces, or one less exotic in nature.
So its nothing new, and its not a fabrication issue for most fabricators.
William C. Pegues, FCSI, CCS, SCIP Affiliate
WDG Architecture, Washington, DC | Dallas, TX |
Ronald L. Geren, FCSI, AIA, CCS, CCCA, SCIP
Senior Member
Username: specman
Post Number: 1252
Registered: 03-2003
| | Posted on Monday, August 18, 2014 - 02:43 pm: | |
Can be done with thermally broken framing.
Ron Geren, FCSI, AIA, CCS, CCCA, SCIP
www.specsandcodes.com |
Brett Scarfino (Unregistered Guest)
Unregistered guest
| | Posted on Monday, August 18, 2014 - 06:08 pm: | |
For dual finish, you will need a system with the bone shaped glass-fiber reinforced nylon thermal breaks. The extruded elements are fabricated separately then joined with the thermal break.
The more common "poured and debridged" systems are entirely one extrusion throughout the finishing process; extruded, finished, pour in polyurethane, ground out connecting web of metal. |
Jerome J. Lazar, RA, CCS, CSI, SCIP
Senior Member
Username: lazarcitec
Post Number: 1164
Registered: 05-2003
| | Posted on Wednesday, August 20, 2014 - 09:59 pm: | |
No go on using a split extrusion, wind loads are too high (max design pressure of negative -180 psf), no split system has an Product Approval - NOA for such an application in SFL, the cost and time to get an NOA is not worth it. The building is right on the ocean, too much salt in the air, polyester as an interior finish is being shot down by the glazing consultants, UV can still get into the interior and fade the polyester finish, add to the fact that this is a condo, there is not enough monetary savings to risk this 'solution'. |
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