Articles

NRCA's new app offers NRCA publications free to members and their employees.

NRCA tests reveal polyisocyanurate R-values are lower than product manufacturers' published long-term thermal resistance values.

With a pro-business majority now in Congress, NRCA is working to advance legislation designed to provide the roofing industry relief from burdensome regulations.

Roof membrane blow-off often is caused by inadequate attachment of edge flashings and copings. Until about a decade ago, it was common for edge flashings and copings to be weaker than the nailers to which they were attached. But with the incorporation of ANSI/SPRI ES-1 into the 2003 edition of the International Building Code, this has changed. It is vital nailers be appropriately designed and installed to achieve good wind performance offered by edge flashings and copings that comply with ANSI-SPRI ES-1.

From their early uses in the 1990s, cool roofs have been said to cause moisture accumulation in low-slope roof systems throughout the U.S. in hot and cold climates. This urban legend says an owner or designer should avoid a cool roof because it will accumulate more moisture underneath it when compared with nonreflective membranes. However, when physics are used to evaluate moisture accumulation in highly reflective roof systems, this roofing industry urban legend can be disproved.

James Myers Co. Inc., Beltsville, Md., performed a roofing renovation project on four buildings—a potting shed, refectory, guest house and operations building—at Dumbarton Oaks estate, Washington, D.C. More than 133 square feet of slate, 5,550 pounds of copper, 5,000 pounds of lead-coated copper and 12,000 pounds of 3-pound lead were used to reroof the four buildings. For its exceptional work, James Myers received a Gold Circle Awards honorable mention.