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Hi Tim,<br><br>
Thanks for the update. Last we spoke on the topic, I think there weren't
any RPLs with a fire rating. Good to hear that there is at least that one
option, though the idea of a spray-on retardant doesn't thrill me. Not
the same stuff (BFRs) they use in electronics I hope.<br><br>
And interested to hear more about the Brooklyn Bridge project and
greenheart. I'd met one of the people behind the project recently, but
all I had to go on was what their website said and what I found online
about greenheart. Always happy to learn more, positive or
negative.<br><br>
David<br><br>
At 01:51 PM 4/7/2011, you wrote:<br>
<blockquote type=cite class=cite cite="">Dear David and Gennaro,<br><br>
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.<br><br>
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.<br><br>
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).<br><br>
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.<br><br>
tim keating<br><br>
At 12:13 AM -0400 4/4/11, David Bergman wrote:<br>
<blockquote type=cite class=cite cite="">Gennaro,<br><br>
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.<br><br>
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.<br><br>
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?)<br><br>
There is a group called Brooklyn Bridge Forest (
<a href="http://www.brooklynbridgeforest.com/" eudora="autourl">
http://www.brooklynbridgeforest.com/</a>) 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.)<br><br>
David<br>
David Bergman RA LEED AP<br>
<font size=2 color="#808080"><b>DAVID BERGMAN</b> ARCHITECT /<b> FIRE
& WATER</b> LIGHTING + FURNITURE<br>
</font><font color="#808080">architecture . interiors
.</font><font color="#008080"> ecodesign</font><font color="#808080"> .
lighting . furniture<br>
</font><font size=2 color="#808080">bergman@cyberg.com
<a href="http://www.cyberg.com" eudora="autourl"><u>www.cyberg.com</a></u>
</font><font color="#808080"><br>
</font><font size=2 color="#808080">241 Eldridge Street #3R, New York, NY
10002<br>
</font><font color="#808080">t</font><font size=2 color="#808080"> 212
475 3106 f 212 677
7291</font><font color="#808080"><br>
</font>At 08:01 PM 4/3/2011, Gennaro Brooks-Church wrote:<br>
<blockquote type=cite class=cite cite="">Hello,<br>
Can anyone suggest a lightweight non-combustible deck material for a roof
deck?<br>
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.<br>
Suggestion?<br><br>
Gennaro Brooks-Church<br><br>
Cell: 1 347 244 3016 USA<br>
<a href="http://www.EcoBrooklyn.com">www.EcoBrooklyn.com</a><br>
22 2nd St; Brooklyn, NY 11231<br><br>
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<br><br>
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</pre><font face="Courier New, Courier"></font><div align="center">
<font size=2><br><br>
"The Earth and myself are of one mind. The measure of the land and
the<br>
measure of our bodies are the same..."<br>
<x-tab> </x-tab>
- Hinmaton Yalatkit, Nez Perce chief<br>
<b>____________________________________________<br>
</font><font size=4><br>
R A I N F
O R E S
T R E
L I E F<br><br>
</b></font><font size=2><i>Sparing the World's
Rainforests from Consumption<br>
</i><b><br>
</b>Rainforest Relief works to protect the world's remaining
tropical<br>
and temperate rainforests by reducing the demand for the products<br>
and materials of rainforest destruction such as timber and paper,<br>
industrial agricultural products such as bananas, beef, coffee,<br>
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><><><><><><><><><><><><><><><><><><><><><><><<br>
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</blockquote>
<x-sigsep><p></x-sigsep>
<br>
David Bergman RA LEED AP<br>
<font size=2 color="#808080"><b>DAVID BERGMAN</b> ARCHITECT / <b>FIRE
& WATER</b> LIGHTING + FURNITURE<br>
</font><font color="#808080">architecture . interiors .
</font><font color="#008080">ecodesign</font><font color="#808080"> .
lighting . furniture<br>
</font><font size=2 color="#808080">bergman@cyberg.com
<a href="http://www.cyberg.com" eudora="autourl"><u>www.cyberg.com</a></u>
</font><font color="#808080"> <br>
</font><font size=2 color="#808080">241 Eldridge Street #3R, New York, NY
10002<br>
</font><font color="#808080">t </font><font size=2 color="#808080">212
475 3106 f 212 677 7291</font><font color="#808080">
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