Frequently asked questions

Concrete Restoration

Will I have to move my vehicle and if so, how long do I stay off the sidewalk or driveway after the slab is mudjacked?

The sidewalk or driveway area should be clear of vehicles when it is lifted. The mudjacking process will take approximately 20 – 40 minutes and in most cases, the sidewalk or driveway can be returned to service shortly after completion.

What happens to the core holes in my driveway?

Initially, the 40 mm (1 ½ inch) diameter core holes are sealed with a foam plug. Within 2 – 7 days, each core hole will be filled with a high strength grout and finished to match the adjacent surface. The grout patch initially will appear darker in color, however, over time these areas will fade to the color of the driveway. On exposed aggregate driveways; each core is returned to its original location. These cores are set in place with a high strength grout, which is tinted to closely match the color of the existing driveway.

We have just landscaped and placed sod around our sidewalk and driveway. Will the sod be damaged during the mudjacking?

No, the process should not damage the sod. There are instances where the sod adjacent to the sidewalk edge may be disturbed; however, this generally happens when the soils are saturated. Therefore we suggest refraining from watering the sod a minimum of 1 day prior to mudjacking.

Can concrete curbs and drainage swales be lifted effectively?

Yes, however, due to the minimal surface area available to effect lift, we combine mechanical and mudjacking techniques to raise the structures to required grade.

Void Filling

Does the pipe structure have to be free of water before you grout fill the pipe?

No, our cementitious grout mixes are designed to displace any water or fluids from the pipe enclosures.

Will the slab lift as the void beneath the joint is filled?

Through instrumentation and a string line survey system, we strictly monitor the slab to ensure that there is no adverse movement.

Our concrete slab has in-slab-heating pipes. Can these pipes be located so they are not damaged during the coring process?

Yes, we locate the in-slab-heating lines with an infrared thermometer prior to the coring process.

What strength of structural grout can you supply?

We have designed, produced and pumped structural cementitious grouts with compressive strengths upwards of 60 MPa.

Fluid cut off

How do you determine where the sewer line is leaking?

We run a video camera through the section of sewer pipe in question to source the leak. The line is also video monitored during the repair process.

How do you determine when all the soil voids and fissures are filled?

Grout pressures and flow parameters are closely monitored during the grouting procedure. Grouting is continued at each location until zero flow rates are achieved at the maximum allowable pressure.