Concrete Products

FEB 2019

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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22 • February 2019 NEWS SCOPE CONSTRUCTION National Association of Home Builders Association-affiliated Home Innovation Research Labs finds that using PermaBase Cement Board as a substrate in exterior wall systems with modified veneer mortar reduces adhered stone installation time by 35 percent and total installed cost by 6 percent against traditional lath-and-cement mortar base alternatives. A study comparing overall labor factors and variations between trades on the two substrate types was conducted on behalf of lead sponsor, National Gypsum in Charlotte, N.C., plus co-sponsors Eldo- rado Stone, Atlanta-based precast veneer producer, and Laticrete International, Bethany, Conn.-based mortar supplier. Home Inno- vations researchers used Group Timing Technique, a short-interval sampling procedure, to record worker activities at predetermined intervals on two identical facades of a test house, observing: a) A masonry crew installed PermaBase and adhered stone veneer in 39.4 man-hours and a scratch-and-lath system plus stone veneer in 45.0 man-hours; and, b) A carpentry crew installed veneer on PermaBase board on the same section and saved an estimated 3.5 man-hours compared to the masonry crew. "Time is money and using PermaBase Cement Board as a substrate in exterior wall systems with modified mortar can reduce construction time, reduce total installed costs and increase system performance for exterior applications," says National Gypsum PermaBase Product Manager Tony Fuller. "Given the construction industry's shortage of skilled labor, evolving building envelope requirements and related construction costs, this is good news for architects, builders, general contractors and their clients." Among benefits the board exhibits when measured against alternative substrates, he adds: Eldorado-backed study reveals labor savings potential in veneer substrates VENEER STONE INSTALLATION COSTS Substrate and trades comparisons Source: National Gypsum Co. Scratch & Lath Base PermaBase (mason crew) PermaBase (carpenter crew) Total materials (base + stone veneer) $2,446 $2,752 $2,752 Labor cost @ $65/hour $3,220 $2,816 $2,563 Total installed cost $5,666 $5,568 $5,314 Cost/sq. ft. $20.61 $20.25 $19.32

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