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Since you mention pumice, what about a lightweight porous stone?
(Basalt?) There are also porous pavers available. Don't know their actual
weight, though.<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><br>
</font>At 03:46 PM 4/7/2011, you wrote:<br>
<blockquote type=cite class=cite cite="">Can anyone think of a material I
could mix into concrete that would<br>
then go away leaving a lighter concrete paver? Salt is too toxic.<br>
Pumice would be great for light.<br>
Gennaro Brooks-Church<br><br>
Cell: 1 347 244 3016 USA<br>
<a href="http://www.EcoBrooklyn.com" eudora="autourl">
www.EcoBrooklyn.com</a><br>
22 2nd St; Brooklyn, NY 11231<br><br>
<br><br>
<br>
On Thu, Apr 7, 2011 at 3:41 PM, Gennaro Brooks-Church<br>
<info@ecobrooklyn.com> wrote:<br>
> I suspect that this issue is being pondered by every deck team in
NYC<br>
> - What decking will satisfy code, weight requirements and
aesthetics.<br>
> RPL may do code and weight but definitely not everyone likes the
look<br>
> of it. Aerated concrete pavers?<br>
> Gennaro Brooks-Church<br>
><br>
> Cell: 1 347 244 3016 USA<br>
>
<a href="http://www.EcoBrooklyn.com" eudora="autourl">
www.EcoBrooklyn.com</a><br>
> 22 2nd St; Brooklyn, NY 11231<br>
><br>
><br>
><br>
><br>
> On Thu, Apr 7, 2011 at 1:58 PM, Tim Vireo Keating<br>
> <t.keating@rainforestrelief.org> wrote:<br>
>> The issue in NYC is not combustability but flame-spread. That's
the test<br>
>> that yields the typical Class A rating, as far as I am aware.
Ipe was<br>
>> assumed to be Class A because importers said it was. I spoke
with the main<br>
>> researcher at the US Forest Service Forest Products Lab who
challenged this,<br>
>> given that no one had ever been able to produce the actual
studies that were<br>
>> being quoted by importers/resellers. He told others calling him
for<br>
>> verification to do their owns testing. Finally, someone did and
the results<br>
>> yielded a Class B rating. Thus, all those roofs decked with ipê
beyond 20%<br>
>> will likely go up just as readily as good oak. And the other
issue when<br>
>> doing this testing is that, of course, ipê, like all woods, will
lose<br>
>> mechanical properties over time. The more porous the wood gets
as it ages,<br>
>> the more likely it is to support the spreading of a fire. For
some reason, I<br>
>> don't think this factor has ever been considered (unless people
have been<br>
>> told that that (spurious) Class A rating will only last for 10
years and<br>
>> then the building owner must replace the material with new
ipê.<br>
>> IMHO, the only answer to this of which I know would be RPL.<br>
>> tim keating<br>
>> At 10:21 AM -0400 4/4/11, John Straube wrote:<br>
>><br>
>> There seems to be some confusion.<br>
>><br>
>> Non-combustible in the code does not mean "it does not
burn". It means it<br>
>> passes a silly ASTM test, and does not lose more than x % of
weight (I think<br>
>> x=10%).<br>
>><br>
>> All wood I have seen fails this, even fire retardent wood,
because it off<br>
>> gases enough water and oils that it fails.<br>
>><br>
>> Gypsum looses too much mass, and would fail, except that it
is<br>
>> grandfathered.<br>
>><br>
>> Fiberglass does not work. Concrete and steel do.<br>
>><br>
>> So Gennaro, do you mean non combustible or do you mean fire
rated or<br>
>> something else?<br>
>><br>
>> On 2011-04-04, at 9:47 AM, Ron Cascio wrote:<br>
>><br>
>> Check this material out;<br>
>><br>
>><br>
>><br>
>>
<a href="http://www.timbersilwood.com/" eudora="autourl">
http://www.timbersilwood.com/</a><br>
>><br>
>><br>
>><br>
>> Can't wait to try some of it out sometime soon.<br>
>><br>
>><br>
>><br>
>><br>
>><br>
>> Ron<br>
>><br>
>><br>
>><br>
>> ----- Original Message -----<br>
>><br>
>> From: David Bergman<br>
>><br>
>> To: Green Building ; Gennaro Brooks-Church<br>
>><br>
>> Sent: Monday, April 04, 2011 12:13 AM<br>
>><br>
>> Subject: Re: [Greenbuilding] fireproof light deck<br>
>><br>
>> Gennaro,<br>
>><br>
>> Add "eco material" to that description and it becomes
an old quest of mine.<br>
>> Are you talking about something to sit directly on the
"real" roof? About<br>
>> the best I could come up with when I last tackled the question
was<br>
>> lightweight concrete roof pavers -- not all that eco though
maybe there are<br>
>> some made with flyash.<br>
>><br>
>> In terms of wood, NYC used to accept Ipe, but I heard a rumor
they stopped<br>
>> when the fire rating claims didn't prove out. And, of course,
there was the<br>
>> rainforest sourcing issue.<br>
>><br>
>> I've looked for fire-rated recycled plastic lumber from time to
time, but<br>
>> have not yet found any. (Tim V-K: any updates you've heard
of?)<br>
>><br>
>> There is a group called Brooklyn Bridge Forest<br>
>> (
<a href="http://www.brooklynbridgeforest.com/" eudora="autourl">
http://www.brooklynbridgeforest.com/</a>) that is trying to set up a<br>
>> sustainable source for greenheart for maintaining the Brooklyn
Bridge. I'm<br>
>> not sure what kind of fire rating greenheart does or doesn't
have.<br>
>> (According to one site I just googled, it carries a
"high/medium" rating.)<br>
>><br>
>> David<br>
>> David Bergman RA LEED AP<br>
>> DAVID BERGMAN ARCHITECT / FIRE & WATER LIGHTING +
FURNITURE<br>
>> architecture . interiors . ecodesign . lighting . furniture<br>
>> bergman@cyberg.com www.cyberg.com<br>
>> 241 Eldridge Street #3R, New York, NY 10002<br>
>> t 212 475 3106 f 212 677 7291<br>
>> At 08:01 PM 4/3/2011, Gennaro Brooks-Church wrote:<br>
>><br>
>> Hello,<br>
>> Can anyone suggest a lightweight non-combustible deck material
for a roof<br>
>> deck?<br>
>> In New York a brownstone has an average flat roof of 700sq.ft.
The law only<br>
>> allows 20% of it to be covered with combustible decking, which
isn't much of<br>
>> 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>
>><br>
>>
<a href="http://www.EcoBrooklyn.com" eudora="autourl">
www.EcoBrooklyn.com</a><br>
>> 22 2nd St; Brooklyn, NY 11231<br>
>><br>
>> _______________________________________________<br>
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>><br>
>> Dr John Straube, P.Eng.<br>
>><br>
>> Associate Professor<br>
>><br>
>> University of Waterloo<br>
>><br>
>> Dept of Civil Eng. & School of Architecture<br>
>><br>
>>
<a href="http://www.buildingscience.com" eudora="autourl">
www.buildingscience.com</a><br>
>><br>
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>><br>
>> --<br>
>><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>
>>
- Hinmaton Yalatkit, Nez Perce chief<br>
>> ____________________________________________<br>
>> R A I N
F O R E S
T R E
L I E F<br>
>> Sparing the World's Rainforests
from Consumption<br>
>> 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>
>> chocolate and cut flowers, and mining products<br>
>> such as oil, gold and aluminum.<br>
>> New York, NY: (917) 543-4064<br>
>> Portland, OR: (503) 236-3031<br>
>>
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>>><><><><><><><><><><><><><><><><><><><><><><><<br>
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</blockquote>
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