Leon Pearson, an alumnus from there, would be proud of her. Pearson Memorial Scholarship for 2022 was awarded to Sydney Hussey, who attends the University of Massachusetts Stockbridge School of Agriculture. Pearson Scholarship Recipientīy Alan Anderson, Chairman of the Ruth E. Posted in News Scholarships Awarded by NHLA and by the Pearson Scholarship Trust This article is reprinted with permission from Hardscape Magazine by Bill Gardocki, past president of NHLA (1994 & 1995), now a hardscape educator. It’s a very easy recipe for successful installation.” Using the best materials, tools, and processes is the easiest way to guarantee the best finished product and safeguard against costly call backs. As Phil Graves says, “the customer wants the best finished result possible. This not only helps with vertical interlock, but also results in a 20% increase in the strength of the polysand.” This is important for the long term viability of the system that all components be as strong as possible.īe diligent in your paver slab selection process, install efficiently, use the proper tools, install all the components that make our system strong and long lasting. Sales, told me that “studies have shown that with compaction on the surface of pavers and slabs you get 12% more sand in to the joint. ![]() Phil Graves, Techniseal’s Director of U.S. It is also extremely important to vibrate the polysand in to the joints of the slabs. There are no worries about cracking, scuffing, or chipping the slabs when using this roller compactor. We use the Weber VPR700 Roller Compactor to do all of our embedment of slabs and pavers. Many manufacturers say not to use a vibratory plate compactor when embedding slabs in to the bedding sand. Using slabs, the embedment compaction process can be tricky. For the same size patio installing Hollandstone pavers I would figure 46 man hours. Including travel time, set up, and clean up, I estimate about 40 man hours on a 500sqft slab patio install. I estimate two hours of laying pavers, one to two hours of cutting depending upon the curves, circle packs, etc., one hour to install edge restraint and sweep in the polysand, and one hour of loaming and seeding the disturbed areas. Then the install crew will take about 45 minutes to level screed pipes, and install our bedding sand. My two-man prep crew will take about 5 hours to excavate, infill, compact, and level a 500sqft area. The important thing is that that rate stays the same all day, day after day, because we are not fatiguing ourselves by installing by hand. Our patio production rate is about 275sqft per hour for three men. ![]() We use the one-man tool for smaller slabs 50lbs and under, and the two-man tool for larger slabs. The tools not only speed up production but save knees, backs, and fingers. We do all of our slab installation with our Pave Mor suction tools. When installed correctly, paving slabs offer an opportunity for increased production rates. Slabs do not have any of these specifications to meet at this time. With pavers, manufacturers must meet specific psi tolerances, water absorption rates, and material deterioration specifications. As of right now, manufacturers have few specifications to meet on the manufacturing end. ICPI is currently performing tests on slabs and working with manufacturers to help establish industry specifications for slabs. Don’t install them in applications where the loads are too great for the product. The same can now be said about paving slabs. When I teach the NCMA Level 1 Certification class I say repeatedly that you don’t want to ask the wall block that you are using to do something it was not designed to do. I have seen projects where contractors used slabs that were a combination of 6″ x 12″, 12″ x 12″, and 12″ x 18″ x 2 3/8″ thick, and observed how many of the pieces’ cracked during compaction in to the bedding sand, or cracked from the loads they were required to carry. When this ratio exceeds 4:1 the units generally cannot be used for vehicular applications. Aspect ratio measures the unit length to its thickness. The aspect ratio is extremely important in selecting the right paver/slab for your job. ![]() Technically, what is a slab? According to ICPI, “slabs generally have an aspect ratio greater than 4:1, a minimum thickness of 2″ and a size larger than 10″ x 10″.” As contractors we must remember that paving slabs perform differently than regular pavers.
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