Interlock is one of the most durable hardscape options available – but like any outdoor surface, it rewards regular care. The good news: interlock maintenance in Ottawa is straightforward once you understand what each season demands. A few hours of attention per year is all it takes to protect a significant investment and keep your driveway, patio, or walkway looking its best.
This guide covers what to do in each season to maximize the lifespan and appearance of your interlock.
Spring: The Most Important Maintenance Season
Spring is when Ottawa interlock needs the most attention – and when problems from the winter become visible. A thorough spring inspection and cleanup sets your installation up for the year ahead.
Spring Inspection Checklist
- Check for heaved or shifted stones: Frost heave can push individual stones up or cause sections to settle unevenly. Identify any rocking or unlevel stones.
- Inspect joint sand: Look for areas where the sand has washed out or eroded – visible gaps between stones or ants emerging from joints are signs the sand needs topping up.
- Check edge restraints: Walk the perimeter and look for any sections that have shifted outward.
- Look for staining: Oil, rust from furniture, or organic staining from leaves.
Spring Cleanup Steps
- Remove winter sand and debris: Sweep off sand used for traction and any debris that accumulated over winter. A stiff broom or leaf blower works well.
- Power wash: A thorough power wash removes dirt, algae, and winter residue. Use a fan tip and keep a reasonable distance – high pressure directly on joints can displace sand.
- Re-level any heaved sections: If any stones heaved significantly, this is the time to lift them, add or remove base material as needed, and re-set. It’s a straightforward repair most homeowners can handle for small sections, or call a contractor for larger areas.
- Top up polymeric sand: If joints are visibly depleted, add fresh polymeric sand after power washing and before rain. Follow the product instructions – most require the surface to be dry and need a light misting to activate.
Summer: Protect and Enjoy
Summer is the season to enjoy your interlock, not stress about it. Maintenance needs are minimal, but a few habits help.
Summer Maintenance Tips
- Watch for weed growth: If polymeric sand is in good condition, weeds should be minimal. Remove any that appear before they establish root systems. Don’t use herbicides that can stain the stone – pull by hand or use a targeted application.
- Deal with stains promptly: Oil from vehicles, BBQ grease, and fertilizer can stain interlock. Address spills quickly with an appropriate cleaner – the longer a stain sits, the harder it is to remove.
- Avoid parking heavy equipment: Delivery trucks, concrete mixers, or dumpsters on a residential interlock driveway can cause damage. If this is unavoidable, lay plywood to distribute the load.
- Check drainage: After heavy rains, look for areas where water pools. Persistent pooling near the house can indicate a drainage issue worth addressing before winter.
Fall: Prepare for Winter
Fall maintenance is about setting your interlock up for the winter ahead. A few tasks now prevent problems in spring.
Fall Maintenance Tasks
- Remove leaves promptly: Wet leaves left on interlock encourage staining and can promote moss and algae growth. Regular sweeping or blowing in fall is good habit.
- Seal if due: If your last sealing was 3 – 5 years ago, fall is an excellent time to seal before winter. Apply sealer to a clean, dry surface – you’ll need a few days of dry weather above freezing. Sealer protects against salt damage and helps polymeric sand bond better.
- Check and top up joint sand: Better to top up in fall before the ground freezes than to discover eroded joints in spring.
- Clear drains and gutters: Make sure downspouts and any drainage features near your interlock are clear. Water backing up near an interlock installation in winter is a freeze-thaw risk.
Winter: Protect Your Investment
Winter care in Ottawa is primarily about safe de-icing practices. What you put on your interlock in winter is the biggest controllable factor in long-term surface condition.
Snow Removal
- Use plastic snow shovels or snow blowers rather than metal-edged blades – metal can chip paver edges and scratch the surface
- Don’t scrape aggressively at the surface – leave a thin layer of snow rather than trying to get the last millimetre
- Snow blower rubber paddles are fine on interlock; metal augers should be set to avoid direct contact
De-Icing Best Practices
- Sand is the most surface-friendly option – it adds traction without chemical damage. The downside is cleanup in spring.
- Calcium chloride works at lower temperatures than rock salt and is less damaging to interlock and surrounding plants. Use sparingly.
- Avoid rock salt (sodium chloride) as much as possible – it’s the most damaging to paver surfaces over time and is hard on adjacent lawn and garden areas.
- Avoid sand-salt mixes if you can – the salt component does more damage than the traction benefit is worth for a well-sealed interlock surface.
What Not to Worry About in Winter
Some minor heaving or movement in winter is normal and not cause for alarm. Interlock is designed to flex with ground movement. If a section shifts noticeably, make a note to address it in spring – but mid-winter is not the time to attempt repairs. Most apparent issues resolve or become easier to assess once the ground thaws.
When to Call a Professional
Most interlock maintenance is DIY-friendly, but some situations warrant a professional assessment:
- A large section (more than a few stones) has heaved significantly and won’t settle back after thaw
- Persistent drainage issues – water consistently pooling in the same area suggests a base or grade problem
- Edge sections spreading widely over a large area – may indicate inadequate edge restraints that need proper repair
- Significant efflorescence (white mineral deposits) that won’t clean off – can indicate water infiltration issues in the base
Catching these issues early and addressing them properly extends the overall life of your installation significantly. For more on what a well-installed interlock system should look like and how long it lasts, see our guide on how long interlock lasts in Ottawa.
Frequently Asked Questions
How often does interlock need to be sealed in Ottawa?
Generally every 3 – 5 years, depending on traffic, exposure, and the type of sealer used. Signs it’s time to reseal include faded colour, sand eroding faster than usual, and water no longer beading on the surface.
Can I pressure wash my interlock?
Yes, but with care. Use a fan tip rather than a concentrated stream, and keep a reasonable distance. Direct high-pressure spray into joints will displace the sand. If you power wash, plan to top up the joint sand afterward.
How do I remove oil stains from interlock?
Fresh oil: absorb immediately with cat litter or baking soda, then clean with a degreasing cleaner or dish soap and water. For older stains, a commercial interlock cleaner or poultice product works better than household cleaners. Test any product on an inconspicuous area first.
Is it normal for some interlock to move in spring?
Minor movement and minor heaving over winter is normal for any Ottawa hardscape – the ground moves. What matters is whether things settle back after thaw, and whether the pattern and drainage are still intact. Significant or recurring heaving in the same area points to a drainage or base problem worth addressing.
Get Your Free Estimate Today
Need a new interlock installation in Ottawa or a professional assessment of an existing one? Contact JAL Deck & Interlock for a free estimate. We serve Ottawa and surrounding areas including Stittsville, Carleton Place, Nepean, Barrhaven, and beyond.