Hydraulic Mulches and Tackifiers
Hydraulic erosion control products are mulches and glue-like substances that are sprayed with water onto the soil surface.
Comments requested on new draft hydraulic mulch specification
MnDOT is re-writing the standard specification for hydraulic mulches and tackifiers. Click the link below to view the draft specification. Comments and questions can be directed to Steve Gebauer (Steven.gebauer@state.mn.us). Please send comments by January 1, 2026.
DRAFT 3884 Hydraulic Erosion Prevention Products
Summary of changes
Tackifier
- requirements have been simplified and categories reduced
Hydraulic Mulches
- will consist of a single category, Reinforced Fiber Matrix
- target application rates will vary based on slope and soil roughness
- are not allowed to have any dye, pigment, or other colorant
- cannot contain any plastic fibers and must be completely biodegradable
- must be tested using ASTM D8298 and achieve a certain C-factor and soil loss
- must cure within 12 hours
Organic Fiber Matrix
- Moisture content increased from 15% to 30%
Mineral Matrix
- This category is new to the spec. It is a cementitious slurry used for temporary stabilization of inorganic soils
Expected timeline
New specs will be incorporated into project lettings about 9 months after the final spec is released. This will also give manufacturers time to conduct testing and apply for the Approved Products List. Actual use on construction projects will likely occur 12 months after the final spec is released because of the time lag between letting, contract award, and starting work.
HECP Applicator Certification
MnDOT co-sponsors a certification class for contractors who will be applying hydraulic erosion control products (HECP). This normally occurs every three years. Contractors who missed the MnDOT training can request training and certification from their HECP manufacturer or vendor.
Training requirements are explained in the following link:
Standard Specification
Requirements for Hydraulic Mulches and Tackifiers are found in the MnDOT Standard Specifications for Construction, available on the MnDOT Spec Book web page. Open the document and search for the following:
- Installation requirements: 2575 Establishing Turf and Controlling Erosion (See 2575.3 E Placing Hydraulic Erosion Control Products)
- Material Requirements: 3884 Hydraulic Erosion Control Products
Design Guidance
Information on choosing the right HECP for the situation can be found in Chapter 13 of the Facility Design Guide. Look for section 13I and Exhibit 13I-2