Spiral Staircase Railing | Curved Staircase
Spiral aluminum stairs are ideal for multiplex housing that have restricted space and confined areas. They feature extruded and cast aluminum perforated steps, weld-free mechanical assembly with stainless steel bolts, and they are rust and maintenance-free as well.
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Spiral aluminum staircases are also ideal for main stairs, loft conversions, changes in floor levels and access to balconies or verandas. As well as domestic residences they are also used in shops, offices, and cafes both as practical staircases and visual statements. The aluminum castings are one-third of the weight of traditional cast iron versions with the same strength capabilities, making them practical for second-floor applications as often no additional reinforcement is needed in the floors to accommodate the weight. They are ideal for both internal and external use.
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Stair nosings and concrete
Author
Message
Robin E. Snyder
Senior Member
Username: robin
Post Number: 791
Registered: 08-2004
Posted on Tuesday, September 17, 2019 - 09:26 pm: I had an interesting question arise today about aluminum stair nosings and concrete stairs. The structural engineer has some concerns about the aluminum being embedded in concrete. Obviously, these nosings are used frequently, and are manufactured for this purpose. Any concerns?
Nathan Woods, CSI, CCCA, LEED AP
Senior Member
Username: nwoods
Post Number: 779
Registered: 08-2005
Posted on Tuesday, September 17, 2019 - 09:42 pm: Well, the sulfates in concrete can “attack” the aluminum, but it’s typically just a minor etching. Aluminum is still preferred over steel because it won’t swell as rust and cause spalling.
That’s all a total guess, but it’s sounds good :-)
Brian Payne
Senior Member
Username: brian_payne
Post Number: 194
Registered: 01-2014
Posted on Tuesday, September 17, 2019 - 09:50 pm: Nope. We do it all the time, especially for photoilluminescent strips for high rises.
Jerome J. Lazar, CCS, CDT, CSI, SCIP
Senior Member
Username: lazarcitec
Post Number: 2062
Registered: 05-2003
Posted on Tuesday, September 17, 2019 - 09:50 pm: separate aluminum from concrete by coating with bituminous or epoxy paint will prolong aluminum integrity. I never allows aluminum, even if painted to touch concrete, aluminum will corrode.
Marc Chavez
Senior Member
Username: mchavez
Post Number: 526
Registered: 07-2002
Posted on Tuesday, September 17, 2019 - 10:12 pm: for internal back of house stairs....no issues because ...no moisture. no moisture=no pH therefore no etching. For exterior stairs separation is good. better yet no metal nosings. all of the metals expand and contract more than the concrete, all will corrode (you could use gold but ...) and gold will expand too.
If you must use metal on exterior. I agree cast aluminum, a coat of epoxy, set it and forget it.
Ed Storer
Senior Member
Username: ed_storer
Post Number: 36
Registered: 05-2009
Posted on Tuesday, September 17, 2019 - 10:55 pm: Exterior stairs: Cast iron abrasive nosings have stood the test of time. To some, they may not look "right", but I think they're great. I could show you a stair that's 60 years old and the cast iron nosings are brown, but no more intrusive than a manhole cover.
Interior stairs: Aluminum is the choice with a protective coating on the underside.
Jeffrey Wilson CSI CCS SCIP
Senior Member
Username: wilsonconsulting
Post Number: 305
Registered: 03-2006
Posted on Wednesday, September 18, 2019 - 11:01 am: I agree: Avoid metal nosings, but if necessary use cast iron on exterior and separated extruded aluminum at interior.
To answer Jerome's question, I specify luminous strips & other egress accessories for stairways in high-rise buildings using MasterSpec's Section 104513 "Photoluminescent Egress Path Markings." You can get the Product MasterSpec version on Balco's website: https://www.balcousa.com/technical-documents/ Jeffrey Wilson CCS CSI SCIP
Wilson Consulting Inc
Ardmore PA
Dave Metzger
Senior Member
Username: davemetzger
Post Number: 755
Registered: 07-2001
Posted on Wednesday, September 18, 2019 - 11:38 am: The New York City subway system mostly has used cast iron nosings on stairs, both exterior and interior, for many decades. I've also seen what appears to be cast nickel silver nosings on some stairs. I expect that cast aluminum would not hold up to the volume of traffic on their stairs.