How do I address root heave under a Vancouver paver?

Root heave under pavers requires cutting the offending roots and installing a root barrier to prevent future intrusion. This is a common issue in Metro Vancouver where mature cedars, maples, and Douglas firs can lift pavers years after installation.

Immediate Repair Process

Start by identifying which tree is causing the problem — follow the heaved paver pattern back toward the nearest large tree. The culprit is usually within 3-5 metres of the affected area. You'll need to lift the displaced pavers using flat pry bars or paver pullers, then excavate the bedding sand to expose the roots underneath. Cut the roots with a sharp pruning saw or reciprocating saw, removing any root sections thicker than 1 inch that are pushing upward into the paver base.

After root removal, you'll likely need to add or remove bedding sand to re-establish proper grade and slope. Compact the area with a hand tamper, re-screed the bedding sand to the correct depth (1 inch), and relay the pavers. Check that the surface maintains proper drainage slope away from your house — root heave often creates low spots that pond water.

Installing Root Barriers for Long-Term Prevention

The key to preventing future root intrusion is installing a root barrier along the tree side of your paver installation. Use solid HDPE plastic sheeting (not perforated) in 2-3 foot wide rolls, available at landscape supply stores for $3-5 per linear foot. Dig a trench 18-24 inches deep along the edge of your paver area closest to the problem tree. Install the barrier vertically with 2-3 inches protruding above grade to deflect surface roots. Backfill the trench and compact thoroughly.

Root barriers work by forcing roots to grow deeper or redirect around the protected area. They're most effective when installed during the original paver installation, but retrofitting is possible if you're willing to excavate along the paver edge.

Metro Vancouver Tree Considerations

Vancouver's mature urban forest creates unique challenges for hardscaping. Western red cedars are particularly aggressive — their shallow, spreading root systems can affect paver installations 4-6 metres away from the trunk. Big leaf maples and Douglas firs also have extensive root systems that continue growing throughout their 50-100+ year lifespans. North Vancouver and West Vancouver properties with mature forest canopy face the highest risk of root intrusion.

The region's year-round growing season means roots never fully go dormant, unlike Prairie provinces where winter freezing halts root growth for 4-5 months. Metro Vancouver's persistent soil moisture from October through March also encourages aggressive root expansion as trees seek stable water sources.

When to Hire a Professional

Call an arborist if the problem tree is over 6 inches in diameter or if you're cutting roots thicker than 2 inches. Removing major structural roots can destabilize large trees, creating safety hazards during Vancouver's winter windstorms. A certified arborist (ISA certification) can assess which roots can be safely removed without compromising tree health or stability.

Hire an interlock contractor for root barrier installation if the affected area is larger than 50 square feet or if the heave has damaged the base layer beneath the pavers. Professional contractors have the excavation equipment and compaction tools needed to properly install barriers without disturbing the surrounding paver installation.

For extensive root damage affecting driveways or large patios, expect repair costs of $15-25 per square foot including root cutting, barrier installation, base repair, and paver releveling. Prevention during initial installation costs $8-12 per linear foot for professional root barrier installation — significantly less expensive than dealing with heave damage later.