How much does polyurethane foam injection cost to level my Ottawa driveway before resurfacing?

Polyurethane foam injection (also called polyjacking or foam jacking) typically costs $8 to $15 per square foot in Ottawa for driveway leveling, making it significantly more expensive than mudjacking but faster and longer-lasting.

Polyurethane foam injection is an increasingly popular method for lifting and leveling settled concrete driveways, sunken asphalt sections, and interlock areas before resurfacing. The process involves drilling small holes (typically 16mm diameter) through the driveway surface and injecting expanding polyurethane foam beneath to lift settled areas back to grade. The foam cures within 15 to 30 minutes, allowing immediate use of the driveway.

Cost factors for Ottawa driveway foam injection include the total square footage requiring lifting, the severity of settlement (how much lift is needed), accessibility for equipment, and the specific foam product used. Minor settling of 25mm or less costs toward the lower end of the range, while severe settlement requiring 75mm+ of lift approaches the higher end. Most Ottawa residential driveway leveling projects range from $1,200 to $4,000 depending on the affected area.

Ottawa's clay soils and freeze-thaw cycles make foam injection particularly relevant here. The expansive clay soils prevalent in Barrhaven, Orleans, Gloucester, and Riverside South cause differential settling as moisture content changes seasonally. Additionally, Ottawa's 50+ freeze-thaw cycles per winter accelerate settlement in driveways with inadequate base preparation. Foam injection addresses the symptoms but not the underlying cause — if your driveway settled due to poor base preparation or clay soil movement, the problem may recur unless drainage and base issues are also addressed.

Advantages of foam injection over traditional mudjacking include faster curing time (30 minutes versus 24-48 hours), lighter weight that won't stress weak subgrade further, and better resistance to Ottawa's freeze-thaw cycling. The polyurethane foam remains flexible and won't crack like concrete slurry. However, foam injection costs roughly double what mudjacking costs ($4 to $8 per square foot for mudjacking in Ottawa).

When foam injection makes sense before resurfacing: If you're planning to overlay new asphalt over existing concrete or asphalt, leveling first prevents the overlay from following the settled contours beneath. This is particularly important for asphalt overlays, which are only 50mm thick and will telegraph any underlying irregularities. For interlock driveways, foam injection can lift settled sections before releveling and adding new bedding sand.

Limitations to consider: Foam injection works best on concrete slabs and stable asphalt. It's less effective on loose gravel, failed asphalt that's already breaking apart, or areas where the base has completely washed out. If your driveway has extensive cracking, spalling, or structural damage beyond just settlement, full replacement may be more cost-effective than injection plus resurfacing.

Professional assessment is essential — foam injection requires specialized equipment and expertise to determine proper injection points, foam volume, and lift rates. Overpressure can crack concrete or heave adjacent areas. Most Ottawa concrete lifting contractors offer free assessments to determine if foam injection is appropriate for your specific settlement issues.

Need help finding a concrete lifting specialist or driveway contractor? Ottawa Driveways can match you with local professionals who offer foam injection services and can assess whether leveling before resurfacing makes sense for your specific project.