VP Building - Quality Buildings for Recreation
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Problem Solver - August 2014

Install a Water Drainable Total Glue-Down Surface


When rain, melting snow or ice can drain through a synthetic surface, instead of forming a puddle or having other standing water problems, it is a much better surface than one that will not drain. In wasted efforts to install good surfaces that are also water drainable, partial glue-downs such as spot, strip or perimeter gluing have been attempted, but with poor results. Designing a total glue-down surface that remains water drainable is more challenging but is, by far, much better.

Q: What is needed for a total glue-down on a water drainable synthetic surface?

A: Three layers must be water-permeable after bonding: the top synthetic surface; the bottom, or sub-surface; and the middle adhesive layer, which bonds the top surface and sub-surface together. In addition to holding the two surfaces together, the adhesive must not clog the pores of the joined surfaces, which would prevent drainage. The result is a water-permeable "sandwich."

Q: What are some water-permeable top surfaces, and drainable sub-surfaces?

A: Water-permeable top surfaces include synthetic turf that is knitted or loosely woven or tufted with drain holes punched through the solid unitary backing. There are also urethane/rubber running tracks, plus playground surfaces made from both urethane/rubber and synthetic turf. Drainable sub-surfaces include "popcorn asphalt"; closed cell shock absorbent foam with drain holes drilled through it; and elastic layer, which is a loosely-bound shock absorbent combination of mostly rubber granules, a urethane binder and some other ingredients.

Q: What about the adhesive for the middle layer of the total glue-down sandwich?

A: There are two different one-component, solvent-based urethane adhesives that can be airless sprayed and that apply like a spider web. In addition, upon hitting the surface, the sprayed adhesive "stands up" and does not flow into or clog the surface's pores. It permits a total glue-down surface that remains porous. Also, the adhesive can be applied in variable weather that exists outdoors and is durable after aging and weathering.



FOR MORE INFORMATION

Synthetic Surfaces Inc.
908-233-6803
www.nordot.com


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