[Greenbuilding] fireproof light deck

Ron Cascio roncascio at verizon.net
Fri Apr 8 04:50:59 PDT 2011


Re: [Greenbuilding] fireproof light deckOnce again, a domestic softwood, with class A fire rating;

http://www.timbersilwood.com/specifications.htm

I would suspect that this material in 1x or 5/4 would meet the weight test Gennaro needs also. 


Ron

  ----- Original Message ----- 
  From: Tim Vireo Keating 
  To: Green Building ; Gennaro Brooks-Church 
  Sent: Thursday, April 07, 2011 1:51 PM
  Subject: Re: [Greenbuilding] fireproof light deck


  Dear David and Gennaro,


  Brooklyn Bridge Forest is not necessarily any longer looking at greenheart. As well, it is unlikely that there will be any "sustainable" source of greenheart, ever. At least, not greenheart that would at all be durable, since, as I may have mentioned before, other than teak, almost all the tropical hardwoods imported into the US that are popular because of their durability get that durability from the fact that the wood is from trees that are 250 - 1000 years old. That is, they are extremely dense as a result of their age. Teak, on the other hand, has an inherent oiliness that gives it extreme durability. This inherent durability can come about even in much younger tress. The same is true of a few other species (I have mentioned, ad nauseam, black locust) that have inherent durability when even young. However, all domestic hardwoods have a Class B or C fire rating and thus do not solve Gennaro's problem.


  As far as recycled plastic lumber, I believe that Axion can add a spray-on fire retardant to their material. However, Axion recycled structural composites are not necessarily lighter than tropical hardwoods, so I don't know if that makes them too heavy for Gennaro's situation.


  I would be happy to contact Axion folks to find out if the flame-retarding coating is currently available and details about it (including the weight of the material).


  Of course, one would have to assess load-bearing capacities vs. profiles, since this would be different than wood, and then factor that into weight calculations.


  tim keating


  At 12:13 AM -0400 4/4/11, David Bergman wrote:
    Gennaro,

    Add "eco material" to that description and it becomes an old quest of mine. Are you talking about something to sit directly on the "real" roof? About the best I could come up with when I last tackled the question was lightweight concrete roof pavers -- not all that eco though maybe there are some made with flyash.

    In terms of wood, NYC used to accept Ipe, but I heard a rumor they stopped when the fire rating claims didn't prove out. And, of course, there was the rainforest sourcing issue.

    I've looked for fire-rated recycled plastic lumber from time to time, but have not yet found any. (Tim V-K: any updates you've heard of?)

    There is a group called Brooklyn Bridge Forest ( http://www.brooklynbridgeforest.com/) that is trying to set up a sustainable source for greenheart for maintaining the Brooklyn Bridge. I'm not sure what kind of fire rating greenheart does or doesn't have. (According to one site I just googled, it carries a "high/medium" rating.)

    David
    David Bergman  RA   LEED AP
    DAVID BERGMAN ARCHITECT / FIRE & WATER LIGHTING + FURNITURE
    architecture . interiors . ecodesign . lighting . furniture
    bergman at cyberg.com    www.cyberg.com
    241 Eldridge Street #3R, New York, NY 10002
    t 212 475 3106    f 212 677 7291
    At 08:01 PM 4/3/2011, Gennaro Brooks-Church wrote:

      Hello,
      Can anyone suggest a lightweight non-combustible deck material for a roof deck?
      In New York a brownstone has an average flat roof of 700sq.ft. The law only allows 20% of it to be covered with combustible decking, which isn't much of a deck. Yet the non-combustible decking is too heavy for the old roofs.
      Suggestion?

      Gennaro Brooks-Church

      Cell: 1 347 244 3016 USA
      www.EcoBrooklyn.com
      22 2nd St; Brooklyn, NY 11231

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