Welcoming the New Year While Keeping an Eye on Next New Year’s Eve Mike Silvers, CPRC, Owner, Silver Systems Inc. and FRSA Director of Technical Services No, you animals, I’m not already thinking about next manual to comply with the new ASCE 7-16 standard. year’s celebration. I’m referring to the implementation Make no mistake about how much more complex the date for the Florida Building Code (FBC) 7th Edition new standard is. At one point, we feared that the num(2020). Fireworks and champagne anyone? What a ber of tables could increase from the current number way to mess up an otherwise great day, even for code of five to possibly more than 32. This wasn’t acceptgeeks. able to the committee, so we went back to work. We Among the most challenging of the changes incor- were able to rework the format and finally ended up porated into the code will be the adoption of ASCE with only 10 tables; no small feat indeed. 7-16 as part of the FBC reference standards. It seems Past editions of the manual used a unique approach like it's been a very long time since we started warning in dealing with the three different pressure zones our members of the possible consequences of this that the previous ASCE 7 standard included. Recent adoption. Despite FRSA and other roofing industry editions used the highest pressures (those in zone 3) group’s efforts to maintain ASCE 7-10, first for the en- for the entire roof area. This simplified the process for tire FBC, and then for roofing chapters only, 7-16 was everyone who referred to the manual. There was no eventually adopted and is now on our doorstep. ASCE, need to calculate the size and location of the zones. the American Society of Civil Engineers, promulgates Unfortunately, the new ASCE 7-16 has up to six difthis standard as the basis for structural design of ferent zones. Many of the zones have pressures that buildings. The greatest concern for our industry is increase dramatically. Because of this, the old method the uplift resistance requirements that have been of using the highest pressure for the entire roof was increased by the new standard. The wind speeds have no longer practical in many, if not most cases. We were not changed, but changes in the pressure co-efficient left with the option of trying to incorporate pressures have in most cases increased the uplift pressures. In for all six zones into the tables. Hence the possibility many cases they are substantially higher. The new of over 32 tables. After much consideration we decidstandard has a significant impact on almost all types ed that a simplified method of implementing the new of roof coverings. pressures was needed. A standard two-sided gable Concrete and clay ASCE 7-16 Uplift Resistance Zones on Hip and Gable Roofs tile roof systems are hit especially hard 3 3 2e 3e 2n 3r 3r 2n because both the 3e underlayment and the tile itself must meet the new higher pressures and resulting increased uplift resistance. Fortunately, the roofing industry in Florida has the FRSA1 1 1 1 2e 2r 2r 2c 2r 2r 2e 2c TRI Florida High Wind Tile Installation Manual to help us make these adjustments. A dedicated group of volunteers has been reviewing and rewriting the manual for nearly two years. Most recently, 3 3 2e 3e 2n 3r 3r 2n 3e we have been revising the tables in the
FLORIDA ROOFING | January 2020
2020 Florida Buyers Guide, Welcoming the New Year...and ASCE 7-16, Roofing Apprenticeship Program Continues to Expand, Attic Ventilation, Me...