A seawall is a barrier that prevents beach erosion by acting as a line of defense by holding back water. Because it is built alongside water, it must withstand brutal conditions such as heavy loads, salt water, violent storms and insect infestation and constant pressure. This hard punishment often results in breaks in the wall, which must be repaired quickly to prevent erosion from further destroying the wall.
Things You'll Need
- Tape measure
- Steel posts wrapped with rebar
- Post hole digger
- Concrete mix
- Pressure-treated 2 x12 inch boards
- Wood saw
- Metal saw
- Nuts and washers
Remove old, broken or rotten boards, preferably in the fall when the water level is at its lowest. Mark the shoreline at eight foot increments for posts.
Dig holes for the posts. Plan for the posts to descend two feet into the soil. Fill each hole with six inches of concrete mix, then place the steel post, making sure it is level and straight. Fill to just beneath ground level with concrete mix. Allow the concrete to dry.
Measure and cut boards that run from post to post. Due to fluctuations in the terrain, each measurement may be slightly different. Measure and cut the boards one at a time.
Drill holes in each end of the board where the rebar is located. Slide the board into place, and fasten with washers and nuts. Trim off excess rebar with a metal saw.
Backfill the wall with gravel or crushed rock. Cover the lower front of the wall with stones or chunks of concrete.
Tips & Warnings
- Consider adding a geo-textile wrap to posts and boards that butt up against the sand, to protect from insect infestation.
- Photo Credit Polka Dot Images/Polka Dot/Getty Images
Seawalls are a type of coastal defense built on the shoreline to reduce the damage from waves and storms. They are also...
How to Fix a Bulkhead
Bulkheads are designed to hold the shoreline in place to prevent erosion. These are typically made from wood planks placed on top...
How to Build a Seawall
A seawall can prevent loss of your waterfront property to erosion. Building a seawall takes a lot of physical labor, but it's...
How to Troubleshoot a Sink Hole
A sinkhole is a hole in the ground formed, as the name implies, by the sinking of soil. The causes for a...
How to Build a Wood Seawall
A seawall is a barrier that is constructed to prevent water from eroding the front of property that sits on a body...
How to Install a Riprap Stone Border
Waterfront property owners have to take measures to prevent erosion. Severe weather, tide changes, ice and waves all take their toll and...
Types of Bulkheads & Seawalls
Bulkheads and seawalls are man-made structures designed to protect bluffs and land banks by separating water and land. Bulkheads serve as retaining...