LEED Credits for Concrete
The USGBC recognizes nine credits for using concrete in green building practices.
Materials and Resources Credit 5 - Regional Materials
This credit is granted when you can demonstrate that raw materials were mined and extracted regionally. Regional extraction is based on the distance of 500 miles or less from the mining operation to the concrete plant, and the plant to the job site. The credit is based on the total weight of the concrete components and the percentage of the weight that was harvested regionally. This includes cement, sand, water, coarse aggregates and any admixtures. All IMI concrete qualifies for these credits.
MR 5.1 - 1 point - 10% of weight was extracted, processed and manufactured regionally.
MR 5.2 - 2 points - 20% of weight was extracted, processed and manufactured regionally.
Materials and Resources Credit 4 - Recycled Content
This credit is granted for using post-consumer, post-industrial/pre-consumer recycled products. Post-consumer products are any products that can be reused or remanufactured after its original purpose is torn down. This would include aggregates that are reused or concrete that is re-crushed and reused. Post-industrial/pre-consumer recycled products would include any waste product that can be added to the concrete mix. This would include admixtures such as fly ash, slag, micro-silica or various fiber materials. This credit is based upon the cost of each material added to the concrete mix and their value in proportion to the cost of one yard.
MR 4.1 - 1 point - 10% of dollar value of post-consumer + half of post-industrial/pre-consumer.
MR 4.2 - 2 point - 20% of dollar value of post-consumer + half of post-industrial/pre-consumer.
Sustainable Site Credit 7 - Heat Island Effect, non-roof
Credits are granted based on a materials ability to reject solar heat. This is primarily done with color: the lighter the color, the less heat it absorbs. The light color of concrete makes this a good candidate for this credit. Points are awarded for hardscapes (outdoor slabs such as roadwork, patios, sidewalks, parking lots, etc.) on a site that has a Solar Reflective Index (SRI) equal to or greater than 29. The SRI is calculated by taking the reflected solar energy, or albedo, and dividing it by the total incoming solar energy. Unless you are coloring concrete to a dark color, this is an easy credit to achieve.
SS 7.1 - 1 point -50% of hardscape surfaces obtain a 29 or higher SRI rating.
2 points - 100% of hardscape surfaces obtain a 29 or higher SRI rating.
imix Eco Pave credits - Water Efficiency Credit 1
This credit is granted for our imix Eco Pave pervious concrete when used to reduce landscape water irrigation. The permeable nature of Eco Pave allows stormwater to run through its porous surface and hold water in its aggregate base or cistern.
WE 1.1 - 1 point - reduce potable water irrigation by 50%.
WE 1.2 - 2 points - eliminate potable water irrigation.
Sustainable Sites Credit 6 - Storm water
Credits are given for both controlling the quantity and quality of water discharged into storm sewers, retention ponds and drainage systems. Pervious concrete, such as imix Eco Pave, is capable of holding water in a subsurface aggregate base until the water can percolate back into the ground. It also cleans contaminants from the water as it passes through its surface.
SS 6.1 - 1 point - reduce runoff with pervious pavement
SS 6.2 - 1 point - infiltrate all storm water on the site.