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2008 Featured Green Roof Project
National Audio Visual Conservation Center (NAVCC)
| Location: |
Culpeper, Virginia |
| General Contractor: |
DPR Construction Inc. |
| Start Date: |
Fall 2004 |
| Completion Date: |
Spring 2007 |
| Size: |
3 Million |
| Awards: |
2007 Washington Contractor Merit Award |
| Featured Articles: |
Landscape Management Magazine - January 2007 |
Project Scope:
Installation of a nearly 6 acre extensive green roof system. The largest of its kind on the East Coast. The roof consisted of 7 different levels that received 4 different blends of custom soil mixes in depths ranging from 6" to 14'. What helped to make this roof unique were the range of slopes that were as severe as 26% on several portions. Since the roof had a weight restriction that limited OUI to using no equipment heavier than a plate compacter we were forced to use mulch blowing trucks to move the soils onto the roof. The specifications detailed moisture and compaction requirements for the installed soils which meant that every 4" lift had to be tested. That's 42 lifts in the areas receiving 14' of soil alone. Pulling plate compactors up a 26% slope with ropes in order to get the necessary compaction was a real challenge. The most sever slopes received an intricate drainage system under the stalite mix consisting of drainage mat run through 4", 6" and eventually 12" outfall pipes. The edge of the entire roof received an 18" wide gravel ballast vegetative free zone separated from the soil with 12"x9"x48" pieces of concrete curbing that weighed 400lbs. each. All of this had to be installed by hand. Once the soils and ballast were installed we got to planting the plugs. We planted 175,659 plugs at a rate of 5,000-10,000 a day depending on how many men were planting. We had at any one time up to 35 men working on the roof divided up among the various tasks. Lastly, the native topsoil areas were amended in place with Compro and seeded with the upland meadow perennial seed mix. The seed had to be sown in two phases raking some of the seed into the surface and broadcasting the rest. The surface was then stabilized with wood fiber tack from a hydro seeder for stabilization. The entire roof was the monitored and maintained for one year under contract. Maintenance for the first year was limited to watering as needed and weeding by hand. The seeding was mowed 4x a year to the smaller emerging plants to get established.
Soil Mixes:
| Native Topsoil Amended w/Compro |
8,690 tons |
| 5/16" Stalite Fill |
6,005 tons |
| Mix #1 |
4,014 tons |
| 55% Stalite |
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| 30% Sand |
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| 15% Compro |
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| Mix #2 |
1,327 tons |
| 80% Stalite |
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| 20% Compro |
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Succulent & Herbaceous Perennial Plug List:
| 15,065 | Sedum album nurale | 3.25" - 72 plug trays |
| 3,545 | Sedum betram Anderson | 3.25" - 72 plug trays |
| 15,065 | Sedum kamtschaticum | 3.25" - 72 plug trays |
| 10,177 | Sedum matrona | 3.25" - 72 plug trays |
| 15,065 | Sedum reflexum | 3.25" - 72 plug trays |
| 15,065 | Sedum sexangulare | 3.25" - 72 plug trays |
| 10,177 | Sedum sieboldi | 3.25" - 72 plug trays |
| 15,065 | Sedum spurium fuldaglut | 3.25" - 72 plug trays |
| 11,195 | Achillea millefolium | 3.25" - 72 plug trays |
| 9,651 | Allium schoenoprasum | 3.25" - 72 plug trays |
| 11,195 | Anthemis tinctoria | 3.25" - 72 plug trays |
| 11,195 | Carex flacca | 3.25" - 72 plug trays |
| 6,106 | Dianthus deltoidea brilliant | 3.25" - 72 plug trays |
| 11,195 | Festuca amethystina klose | 3.25" - 72 plug trays |
| 6,106 | Seslaria autumnalis | 3.25" - 72 plug trays |
| 9,792 | Talinum calycirum | 3.25" - 72 plug trays |
Upland Meadow Perennial Seed Mix:
| Perennials |
| 6% | Chamaecrista fasciculata | Partridge Pea |
| 5% | Aster laevis | Silk Smooth Aster |
| 5% | Echinacea purpurea | Purple Coneflower |
| 5% | Rudbeckia hirta | Black Eyed Susan |
| 5% | Senna hebecarpa | Wild Senna |
| 3% | Heliopsis helianthoides | Ox-Eye Sunflower |
| 3% | Senna marliandica | Maryland Senna |
| 2% | Coreopsis tripteris | Tall Coreopsis |
| 2% | Liatris spicata | Spiked Gayfeather |
| 2% | Ratibida pinnata | Greyheaded Coneflower |
| 2% | Rudbeckia triloba | Brown-Eyed Susan |
| 1% | Aster sagittifolius | Arrow Leaved Aster |
| 1% | Pycnanthemum incanum | Hoary Mountain Mint |
| 1% | Ater novae-angliae | New England Aster |
| 1% | Eupatorium hyssopifolium | Hyssop Leaved Boneset |
| 1% | Solidago speciosa | Showy Goldenrod |
| 1% | Monarda fistulosa | Wild Bergamot |
| 1% | Veronia novaboracensis | New York Ironweed |
| 1% | Tradescantia ohioensis | Ohio Spierwort |
| 1% | Baptisia australis | Wild Blue False Indigo |
| 1% | Penstemon digitalis | White Beardtongue |
| Grasses |
| 15% Andropogon ternarius | Splitbeard Bluestem |
| 15% Sorghastrum nutans rusment | Rusmey Indiangrass |
| 10% Bouteloua curtipendula | Sideoats Grams |
| 10% Elymus canadensis | Canada Wild Rye |
| Cover Crop Recommendation |
| 5lbs/acre | Lolium multiflorum | Annual Ryegrass |
Other Green Projects
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|
One story parking garage with intensive green roof. Soil was blown onto roof using mulch blowing trucks. |
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|
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Three story extensive green roof. Soil and equipment were placed on the roof with the use of a crane. |
1209 North Charles Street
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Two story light weight soil mix creating an intensive green roof. |
Aberdeen Proving Grounds
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Three story intensive green roof |
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