Should I pre-treat Vancouver pavers before winter sets in?

Pre-treating pavers before winter in Metro Vancouver is beneficial but not always necessary — it depends on your pavers' age, current condition, and what type of "treatment" you're considering. The most valuable pre-winter maintenance is ensuring your polymeric sand joints are full and intact, followed by cleaning and optionally sealing if conditions are right.

Joint sand inspection and replenishment is the most critical pre-winter task for Metro Vancouver interlock. Check all paver joints for missing, eroded, or deteriorated polymeric sand. Vancouver's heavy winter rains (October through March bring 70% of our annual 1,200mm+ rainfall) will wash out any loose or missing joint sand, allowing pavers to shift and weeds to establish in spring. If joints appear empty, cracked, or have moss growing through them, remove the old sand and apply fresh polymeric sand during a dry weather window in September or early October. You need 24-48 hours without rain after application for proper curing.

Cleaning before winter can prevent staining and organic buildup but timing matters significantly in our climate. Pressure wash pavers to remove moss, algae, dirt, and organic debris that has accumulated over summer. Use 1,500-2,500 PSI with a rotating surface cleaner attachment to avoid striping. Clean pavers dry faster and allow better inspection of joint sand condition. However, don't clean during the rainy season (November-March) because pavers won't dry properly and you can't effectively apply polymeric sand or sealer in wet conditions.

Sealing before winter is only recommended under specific conditions in Metro Vancouver. If your pavers are at least 6-12 months old (allowing efflorescence to fade), completely clean, and you have a guaranteed 48-hour dry window, sealing can provide additional protection against winter moisture and make spring cleaning easier. However, sealing wet or dirty pavers traps moisture and contaminants beneath the sealer film, causing white hazing and peeling that's difficult to fix. Given our unpredictable fall weather, many professionals recommend sealing in late spring (May-June) instead when you have more reliable dry conditions.

Moss and algae prevention is particularly important for Metro Vancouver's wet winter climate. Apply a moss prevention treatment (iron sulfate or zinc sulfate based) in early fall before heavy rains begin. This helps prevent the slippery moss growth that becomes a safety hazard on walkways and steps during our 6-month rainy season. Products like Wet & Forget or Moss-B-Gone work well when applied during dry conditions.

Drainage inspection is essential before winter — ensure all surface water drains away from your pavers and toward appropriate outlets. Clear any debris from drainage channels, check that downspouts aren't directing roof water onto paver surfaces, and verify that your pavers still maintain proper slope (minimum 2% away from buildings). Standing water on pavers during winter saturates the base material and causes shifting and settling.

Skip sealing if your pavers are new (less than 6 months old), if joints need sand replenishment, or if you can't guarantee 48+ hours of dry weather after application. Also avoid sealing if you see white efflorescence (powdery residue) on the paver surface — this indicates the pavers are still curing and sealing will trap the efflorescence permanently.

For professional treatment, expect to pay $1,500-3,500 for cleaning and sealing a typical 500 sq ft area, or $300-800 for polymeric sand replenishment alone. Many homeowners can handle joint sand inspection and moss treatment as DIY projects, but sealing requires proper timing and technique to avoid costly mistakes.

The most practical approach for most Vancouver homeowners is focusing on joint sand condition and drainage — these provide the greatest protection against winter damage at the lowest cost and risk.