Sprayed Lightweight Fill


Past 20FDS applications include a mass lightweight fill for utility protection under a new bridge approach fill embankment on I-395 in Alexandria, Virginia, and as a sprayed-in-place alternative to EPS blocks for lightweight fill over a buried parking deck in Fairfax, Virginia. 

CJGrout-20FDS is a fast, dry environment sprayed foam used for mass lightweight fills and bulk void filling applications.  20FDS is only suitable for sprayed applications. Due to its very fast speed, 20FDS is not suitable for injection applications. Some projects include:

  • sprayed tunnel abandonment under an apartment in Boston, MA
  • lightweight fill in lieu of EPS in Tysons Corner, VA
  • mass lightweight fill under I-395 in Arlington, VA

Typical Uses

The most common use for this geotechnical polyurethane grout is spraying masses in place. This can include voids around underground structures, large voids below floors, and sinkholes. Inside buildings, spray filling floor pits is a common use.

Physical Properties of CJGrout-20FDS

CJGrout’s 3.5KSF compressive strength makes it well suited for use under light to moderate loads. The free rise density is 2.1lb/cuft.


Like all plural component polyurethanes, CJGrout 20FDS requires high pressure impingement mixing. The system pressures are approximately 1000psi. However once the material leaves the mixing tip, it goes to atmospheric pressure.

The grout expands up to 24 times its liquid volume during the expansion phase. However, if there is any back pressure, the grout will end up denser. The cream time and tack free times are very fast.

Plural component geotechnical polyurethane raw material is transported and stored in IBC totes. Because of this universal packaging and ease of transport, significant quantities of material can be stockpiled onsite. A single semi load of IBC totes will provide up to 485CY of in place material. This allows for placing significant quantities of material with very little transportation and logistics related risks.

Speak With An Expert

Facing a challenge? Give us a shout or shoot us a text. Click the state marker for the location of the project for contact info for the appropriate rep.