Abandoned Mine Shaft & Opening Closure Pittsburgh, PA


Without the bi-product of heat, FillFoam is a fast & safe way to fill cavities and voids quickly and with limited access. Unlike Polyurethane that is ‘blown’ with a chemical reaction via water or gas, FillFoam is air blown and then the cells are hardened.

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Save Time & Money

Can be Excavated if Necessary

Can Flow at Any Rate or Quantity

Variable Densities of 10-50 PSI on Site/Same Material

Why Use Fill Foam to Close An Abandoned Mine Shaft or Opening in Pittsburgh, PA

Polyurethane foam (PUF) plugs are a more recent development for closing & sealing abandoned mine shafts which are inexpensive and easily installed in remote areas. The advantage to using Fill Foam to close your abandoned Pittsburgh mine shaft is that there is no heat during installation. On high volume applications where heat would be a concern for polyurethane, FillFoam is safer.


In some applications where material needs to be pumped long distances or depths FillFoam can flow as far as 500 ft or up to miles based on the density; where as, Polyurethanes ability to flow would be limited by the reaction time. It is a matter of using the right product to fit the specific project conditions and requirements. There are times that could be polyurethane foam, FillFoam or both.

Benefits of Closing Your Pittsburgh Coal Mine Shaft with FillFoam

  • No Heat is created during installation
  • Safe to install at any rate or quantity
  • Immune to seasonal change
  • Hydro-Insensitive / UV-Insensitive
  • Variable Densities of 10-50 PSI on site/same material (10 – 60 Cubic yards per hour depending on equipment)
  • Can flow long distances, hundreds of feet to many miles
  • Lightweight & Strong
  • FillFoam can be excavated if necessary

FillFoam FAQ

Have a FillFoam related question? We have the answer. Check out these FAQs and give us a call today for more information!

  • How Quickly Will FillFoam Solidify After Closing Our Mine Shaft?

    FillFoam can begin to solidify in a few minutes. The temperature and moisture in the surrounding environment will impact how long it will take to cure over the next days.

  • How Much Does the Comressive Strength Change when Water Saturates FillFoam?

    The strength of the material or shape of the foam does not change when it is saturated with water. The weight per cubic foot of the foam will increase with the absorbed water, but the water can also be easily pulled from the adjacent soils or plants as needed. Another interesting fact, FillFoam will never saturated 100%. 30% will always remain air and cannot be saturated. This allows the foam to stay buoyant.

  • Does FillFoam Expand?

    FillFoam is pumped and installed pre-expanded. There is no expansion after the product is installed.