Imbricated Stone

02 Oct Imbricated Stone

Construction projects are known for producing debris that is potentially harmful to the surrounding environments. As a result, many localities have Stormwater Pollution Prevention Plans (SWPPP) that contractors must adhere to for their construction projects. When impervious surfaces increase, water runoff increases as well. Silt fences, water diverters and other techniques are employed to mitigate the increased sediment pollution.  Imbricated stone plays an important mix on a number of levels.

Applications of Imbricated Stone

Contractors and owners have a more attractive water control solution with imbricated stones. Imbricated stones are especially useful as rip rap that define the borders of stream banks. These stones are usually two to three foot long boulders that overlap and stack on top of one another. The overlapping consistency of the stones provides the structural integrity of the wall.

Boulder revetments are sloped stone walls designed to absorb the impact of incoming water flow. Revetments protect existing shorelines and slopes. Imbricated rip rap is constructed similar to revetments. However, imbricated stone walls are built high enough to completely protect the stream bank.

The steps in building an imbricated stone streambank are as follows:

1. Grade the streambank to the desired angle.
2. Trench the toe (bottom) of the bank for the installation of the footer stones.
3. Install geotextile fabric from the top of the bank down to the footer trench.
4. Place the footer stones on top of the fabric in the trench.
5. Build the wall over the footer stone with each stone overlapping the one below by a half.
6. Transition top of bank soil into imbricated stone wall and stabilize.

Advantages of Imbricated Stone

Using imbricated stone in lieu of other methods include:

• Less space requirements for angled walls. The stones can be installed at a slight angle and still provide soil stability. Practical for almost all streambanks.

• Attractive option for streambank perimeters at lakes and parks.

• Economical solution as compared to standard concrete retaining wall.

Additional uses of imbricated stone are inclusive of:

• Outfall Stabilization – Fast flowing water may be dissipated by stone walls. However, hill slopes may be fashioned to contain outfall pipes to mitigate water flow. The outfall pipes can be supported with imbricated stones.

• Step Pools – Channel rocks are lined in a continuous series with deeper pool areas between each series of rocks. Water flows down the vortex shaped arrangements in a series of short drops. A process similar to walking down stairs. Channel stability is provided for during massive flood events.

• Stone Toe – This measure prevents undermining at the bottom of stream banks. Soil fabric may be installed on top of the stone toe to provide for a vegetated streambank.

Bulk Delivery Options

The bulk source of these site construction materials come from stone quarries. The stones are often transported from the quarries by trucks or railroad cars. Local deliveries are made using dump trucks, while flatbed trailers are used for longer distances.

If you are in the market for bulk loads of imbricated stone, look no further than Same-Day Aggregates.  Meeting the demands of the Washington DC, Maryland and Virginia builder community since 1999.  Contact us today for a delivery schedule and estimate.  Phone: 202.930.3090