Bin/Silo Base Sealing & Waterproofing

Silos and bins often require waterproofing where they interface with the ground – the point where water ingress is most likely.

Sealing silo bases is an essential practice in agricultural and industrial settings for several reasons:

  1. Prevention of Moisture Infiltration: Silos often store grains or other materials that can be susceptible to spoilage when exposed to moisture. Sealing the base helps prevent moisture from seeping into the silo, preserving the quality of the stored materials.
  2. Pest Control: Silos can attract pests such as rodents and insects, which can cause damage to stored grains. Sealing the base helps prevent these pests from entering the silo and contaminating the stored materials.
  3. Preservation of Stored Material Quality: By sealing the base, the integrity of the stored materials is maintained. This is crucial for agricultural products that are intended for human or animal consumption, as any contamination or spoilage can render the materials unfit for use.
  4. Protection of the silo structure: If silo sheets are permanently immersed in water this will accelerate their degradation and corrosion, eventually leading to perforations in the silo structure.

How do we seal silo and bin bases?


As with any waterproofing application the key to maximum longevity and optimal performance is correct and thorough preparation. If existing failed waterproofing is present this should be removed so that the new silo base sealing solution can be applied directly to the silo structure.

Preparation can be in the form of high pressure water jetting from 4,000psi to 10,000psi. If heavy corrosion deposits or very stubborn coatings are present we can extend this to pressures of up to 40,000 psi using our ultra high pressure water jetting equipment if required.

Ensure the correct climatic conditions

Nearly all coatings and waterproofing solutions have specific parameters with regard to temperature, relative humidity and dew point that they must be applied within. Our silo base sealing solution is no different, except that the only restrictions are that the temperature must be above 5 degrees centigrade and the surfaces to be coated free from standing moisture.

Treat Corrosion Present

If the silo base being waterproofed is aged and corrosion has occurred we can easily treat this using Corroless Rust stabilising primers. These products mean that abrasive blasting can be avoided, reducing disruption and the production of waste.  View our rust stabilisers page for more information.

Seal Details

Silo bases often have sheet laps, seams and crevices that require sealing /detailing prior to the application of the main waterproofing. This can include the installation of a fillet detail at the sheet /floor interface which is the point most liable to movement.

By pre sealing these areas using a polyurethane mastic compound it acts as a secondary layer of waterproofing, but also serves to isolate these areas from the waterproofing membrane to allow greater elongation and movement potential.

Seal Voids / Crevices

With externally braced silos there are often crevices and voids that are impossible to seal fully by applying coatings and waterproofing using brushes and rollers. As part of our silo base sealing methodology these areas are injected using a Hydro Reactive polyurethane resin that foams to form a water tight pressure seal in these areas, meaning that full access is not required.

Once the resin has foamed and reacted any excess foam is trimmed flush to provide flat surface to apply the waterproofing membrane to.

Silo Base Sealing Scotland 03


As part of the layered approach we take to silo base waterproofing, particularly externally braced silos we make use of the grout like properties of our waterproofing material. The top corrugation is injected with waterproofing material in order to fully fill the void between external braces and the corrugations. This again forms a seal that is not dependent on perfect application by brush and roller.


Any areas where different materials interface or where movement could be expected such as the sheet/concrete interface are reinforced by the inclusion of a woven waterproofing bandage embedded within the waterproofing membrane for additional strength.

Application of the Waterproofing Membrane

Our flexible waterproofing membrane Corrolastic SG is liquid applied by brush and roller in a minimum of two coats. The liquid applied nature means that this material can easily incorporate details such as nuts, bolts and bracings whilst ensuring a fluid tight silo base sealing solution.