How to Install Riprap Properly: a Cheat Sheet
How to install a riprap shoreline that stands the test of time? Follow this short cheat sheet I’ve put together.
In order of importance:
- Proper grade – No steeper than a 3:1 slope (horizontal to vertical). We always grade a shoreline prior to fabric and riprap installation.
- Proper fabric – A heavyweight premium filter-fabric must be used. Although we use premium 8-ounce fabric, 4- or 6-ounce filter-fabric would be acceptable.
- Fabric should be thoroughly stapled to the ground or shoreline. We use 6-inch steel staples throughout the entire sheet of fabric.
- Fabric should be free from seams wherever possible. If a seam is unavoidable, then the fabric must be overlapped by several feet and be shingled in the proper direction. We try to avoid seams whenever possible.
- If the muskrat-deterrent option is chosen, proper steel mesh with 1” or less squared or hexagonal openings must be used. Rolls of steel mesh used should measure 3-4 in roll-width and extend approximately 1-2-feet into the water. We typically use 6-foot-wide rolls of vinyl-coated wire mesh, which not only fights corrosion, but also enables us to extend the wire mesh much further into the water for added protection.
- Proper type and size of riprap – A clean mix of riprap 6 to 12 inches in diameter is common. We almost always use 6-12-inch Fieldstone riprap in shorelines, but any smooth rock between 6-30 inches in diameter would be acceptable. The steeper the shoreline and/or the faster the water may be moving (i.e. on a river), the larger the riprap should be.
- A rock bucket should be used during the installation of riprap. A rock bucket keeps your new shoreline free from dirt and other contaminants. It is basically a bucket with small openings in the sides and bottoms. We use it to scoop up the rock, allowing the dirt to fall in the bucket so that only clean riprap remains. We use a custom-made rock bucket – which we built ourselves – that has larger and more openings in it than do the standard rock buckets used by other companies.
- Proper installation of decorative borders – When decorative borders are installed it is important for the fabric beneath your riprap to match the fabric beneath your decorative rock or mulch. We always leave several feet of excess fabric along the top edge of our shorelines so that a single piece of fabric can be used from the lake bottom all the way to the border of edging along your shoreline.
- Rubber tracks – This is important if you don’t want your yard to be destroyed by heavy equipment. Rubber flotation tracks should be installed on all equipment to minimize damage. It doesn’t matter how large or small your project is. Even a small project requires roughly 17 to 25 tons of riprap to cover adequately most shorelines. That requires a lot of trips back and forth through your yard. If you hire a company that uses tires, metal tracks, or even raised rubber treads, you will spend thousands more dollars on your new, major yard-repair project. We only use smooth rubber flotation tracks on our skid steers. The result is that over the past two seasons we haven’t had a single yard require more than a little topsoil and seed here and there to remove the evidence of our work. We purposefully buy used tracks with little or no tread remaining so we can flit across yards again and again without causing significant damage. This means less work for us to repair damaged turf, less work for you maintaining fresh, delicate sod, and less money that we have to charge.