Pavers Score More Points

Spring 2013

With the upcoming release of LEED v4, some important changes are in store

by David R. Smith

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Pavers Score More Points

Other proposed changes in LEED v4 continue to affirm segmental concrete pavement as a sustainable product and pavement system.

Under Sustainable Sites, Rainwater Management credits continue to be awarded for using permeable interlocking concrete pavement (PICP) for stormwater volume and pollutant reductions. LEED v4 raises the bar by requiring management of the 95th percentile storm. This can require increased PICP use to earn two points. Three points can be earned in dense urban areas with zero lot line buildings if designs manage the 85th percentile storm.

Solar reflective index (SRI) minimum values are increased from 29 to 33 for new non-roof and roof surfaces. The increase accounts for SRI reductions due to aging. SRI 29 can be used if the supplier can provide data demonstrating an SRI 29 for materials that have aged for three years. Paving on low-sloped roofs, such as roof plaza decks should have an SRI of 82 for new surfaces or a 62 for three-year old surfaces. Grid pavements continue to be an at-grade option for reducing the urban heat island. All of these approaches for roof and non-roof designs can earn two points.

In Materials and Resources, several existing material conservation practices are grouped under a credit titled, Building Product Disclosure and Optimization – Sourcing of Raw Materials. This credit grants one point for material extraction and manufacturing within 100 miles (160 km) of a site and provides a two-fold multiplier for valuing materials supplied within this radius.

One point is still offered for recycled content, especially if used as a substitute for cement. Likewise, one point is offered for obtaining raw materials from suppliers who commit to long-term ecologically responsible land use and extraction.

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