Mass Timber Tall Buildings And Reforestation Must Be Our Future
Support Mass Timber And You Are Supporting More Reforestation
CLT Mass Timber tall wood buildings among the most innovative structures in the world and should not take safety risk since there is no history in fire they are only supported by E119 laboratory test results. We can not abuse the Green Spin over safety. We should also consider how trees sequester CO2 and leave behind Carbon and that carbon gets released back into the ozone in fire. If you want to spin Green than recognize the value of fire defending that carbon in lumber from fire.
California's new building code will force developers to take closer looks at innovative construction methods like cross-laminated timber, according to experts. NYC FDNY and DOB are looking at Mass Timber for New York because of its Green Spin.
18 Story Mass Timber Building Built In BC Canada 2016
By Gregory Havel
For more than a century, it has been proposed that a layer of char on the surface of heavy timbers acts as insulation and will slow or prevent further burning of the wood. This proposal was questioned by Francis Brannigan in 1971 and 1982 in the earliest editions of his (and its other authors) book Building Construction for the Fire Service. Yet buildings of wood construction, whether of heavy timber, wood frame, or lightweight wood structural components continue to burn and are destroyed by fire. If there were merits to this proposal, spectacular photos and videos of these fires would not appear as often as they do on televised news broadcasts or on the Internet.
This proposal is again being used by the people who today promote the use of “mass timber” in construction, which includes glulams, “cross laminated timber [CLT],” “nail laminated timber,” and other variations.
Char may be an insulating material, but only when it has been cooled to the ambient temperature and isolated from the fire which created it from wood. Since char is mostly carbon (fuel) and ash, it can be easily ignited. If it were not, charcoal would not be such a popular fuel for outdoor cooking.
I propose that char on the surface of wood that is still burning is not an insulator; rather, it is still fuel at or above its ignition temperature and is part of the combustion process. As the wood timbers; load-bearing laminated columns, beams, and laminated walls and floor panels; and other structural members continue to char, more of the cross section of the load-bearing wood will be replaced by char, which has little strength, either compressive or tensile. Eventually, enough wood will be converted to charcoal and combustion gases (water vapor, carbon dioxide, and others) that the safety factor of the structural members will be burned away, leaving that part of the building subject to structural collapse.
By Steve Conboy
I was involved in discussions to add additional fire protection back in 2016 to the Mass Timber Prototype built on the pre fab factory I was a shareholder of in BC Canada. They ignored me then and they are ignoring me now but I will not stop until those that build mass timber buildings put firefighter's and workers safety first. We lost two workers in a suspicious fire in Denver during mid day and since this mass timber movement has zero fire protection during construction along with no fire history it's a no wonder why the insurance risk managers do not want to even write this business.
I’m also tired of the green spin when nobody wants to consider defending the carbon stored in wood from fire that would release it back into the ozone. I have written a White Paper report supported by both E84 and E119 laboratory testing making Mass Timber 0 in flame spread when raw wood is 70. Add to it that I have written a Carbon Tax Credit Bill to support those that fire defend 100% to help support more reforestation. I’m a big supporter in this mass timber movement and anything that supports housing starts while we promote reforestation and sequestering CO2 and defending carbon stored in lumber. Replacing steel with mass timber will reduce carbon dioxide emissions some say by 15% to 20%. that to me means as much recycling at our curb and adding more clean energy. Some have said that by adding mass timber tall structures with wood over steel would be like taking two million cars worth of emissions off the road.
If we can lower the perception of loss and risk we hope the insurance underwriters will relax premiums and support this mass timber movement by making it truly more cost effective than steel structures. We also have to consider that these pre fab mass timber lego sets support our labor shortage and help our builders erect buildings faster with less labor.