Then, fill the cavities beneath the slab along the joint by injecting an expanding polyurethane foam or pump a flowable mortar through drilled holes along the joint.

In non-saw cut joints, such as thru-slab construction or “cold” joints, or saw cut joints deeper than 2 in., ACI recommends installing the filler to a minimum depth of 2 in.

Alternative construction ideas, such as concrete filler slab roof with cement blocks, can be applied where possible. June 9, 2025 e-Paper. LOGIN Account. eBooks Subscribe GIFT FRONT PAGE.

Teams then use a high-pressure injector to push the filler under the foundation and fill in voids or lift the slab up to fix uneven areas. Advertisement. How Much Does Mudjacking Cost?

A crew from NFI, of Albuquerque, handles a foam slab that will be used to plug a mine at Saguaro National Park East. Crew members, from front, were Jaime Delgado-Cortes, Nick Valdez and Tony Nava.