Houses built before 1960 in Canada often have lead-based paint somewhere; through the 1970s lead paint use tapered but didn't fully disappear until residential lead paint was banned in 1976. Intact lead paint isn't immediately dangerous — the danger comes from disturbing it: scraping, sanding, heat-stripping, or demolition that turns paint into airborne dust or chips. Lead poisoning is cumulative and especially dangerous to children under 6 and pregnant adults.

This guide explains how to test for lead, when paint can be left in place, and what containment is required if you must disturb lead-painted surfaces.

Before you start

Three things to settle:

1. Pre-1960 = test; 1960-1990 = test if disturbing. Pre-1960 houses: assume lead paint until tested. 1960-1980 houses: lead use declined but persisted, especially on exterior trim and high-wear surfaces — test before disturbing. Post-1990: very low risk.

2. Intact paint can stay. Lead paint that's painted-over, intact, and not chalking or chipping is generally safe to leave. Encapsulation (paint over with primer + paint) is a valid long-term strategy. Removal disturbs lead and creates dust.

3. Children and pregnancy = highest stakes. Lead exposure causes irreversible cognitive impairment in young children. If you have or expect children, take this seriously. Have lead dust testing performed after any work and before re-occupying.

What you'll need

Tools

DIY lead test swabs (3M LeadCheck — instant) or send-away lab kit
Spray bottle (water for wet methods)
HEPA vacuum
Plastic sheeting
Painter's tape

Materials

P100 respirator with cartridges
Disposable Tyvek coveralls + boot covers
Disposable gloves
Encapsulant primer (for in-place sealing)
Lead-rated waste bags (for chips and contaminated material)

Don't dry-sand or heat-strip lead paint

Power sanding and heat guns vapourize lead. The only safe disturbance methods are wet scraping, chemical strippers (low-VOC, non-heat), or licensed abatement.

If you've already power-sanded or heat-stripped, stop. Wet down the area to suppress dust. Treat as contaminated and clean with HEPA vacuum + wet wipe.

Step-by-step instructions

Test before disturbing painted surfaces

DIY swab test: 3M LeadCheck swabs are inexpensive. Crush the swab to release reagent, rub on a cleaned painted surface — pink/red colour indicates lead.

Lab test: send paint chip samples to a certified lab. More accurate than swabs.

XRF testing: a licensed inspector with an X-ray fluorescence gun does a full-house survey. Most accurate, no destruction.

If negative: proceed with normal precautions

Negative test means no lead — proceed with normal renovation work and dust control.

Keep test results on file.

If positive: decide encapsulate or remove

Encapsulate: clean surface, prime with adhesive primer (Zinsser Peel Stop or similar), apply 2 coats new paint. Lead is sealed in place. Lowest risk.

Remove: only if encapsulation isn't viable (heavily damaged paint, surface needs structural work). Plan for full containment + PPE.

For doors, windows, and trim with intact lead paint: encapsulation almost always wins. Removal of lead-painted trim creates major dust issues.

Set up containment for any disturbance

Plastic sheet the floor 6+ feet beyond the work area. Tape to baseboards.

Plastic seal doorways and HVAC returns to isolate the work zone.

Run HEPA air scrubber if generating any dust.

Workers wear P100 respirator + Tyvek coveralls + boot covers.

Use wet methods only

Wet scraping: spray paint with water before scraping. Wet paint chips fall onto plastic instead of becoming airborne.

Chemical strippers: low-VOC strippers (Citristrip, Smart Strip) lift paint without heat or sanding. Slower but lead-safe.

Never: power-sand, heat-strip, or dry-scrape lead paint.

Capture and dispose of chips and dust

Chips: collect from plastic and place in heavy-duty contractor bags. Double-bag.

Dust: HEPA-vacuum work area. Then wet-wipe with damp cloth.

Dispose at municipal household hazardous waste depot. Don't put lead waste in regular garbage.

Clean up to a tested standard

Final clean: HEPA-vacuum + wet-wipe + HEPA-vacuum again. Three-pass clean.

Discard PPE (coveralls, gloves) in the same hazardous waste bag.

If young children will use the space: get post-work dust wipe testing to confirm lead dust is below safety thresholds.

Hand off to professionals when scope grows

Whole-house repaints, exterior siding restoration, large-scale window/trim replacement: hire Ontario-licensed lead contractors. They have the equipment, training, and disposal access.

Common mistakes that cost you

Dry sanding lead paint. Power sanding aerosolizes lead. Wet methods only.
Heat gun on lead paint. Vapourizes lead — extremely dangerous. Chemical strippers only.
Standard shop-vac for cleanup. Blows lead dust through filter. HEPA vacuum required.
Re-occupying without dust testing. Invisible lead dust can recontaminate. Test before children return to the space.
Throwing chips in regular trash. Lead is hazardous waste. Use municipal HHW depot.

Frequently asked questions

Can I just paint over lead paint?

Yes — encapsulation is the standard recommendation if the existing paint is intact.

Clean the surface, apply adhesive bonding primer (Zinsser Peel Stop), then 2 coats new paint.

Re-encapsulate every 5-10 years if surface starts showing wear.

Are the DIY lead swabs accurate?

3M LeadCheck swabs are EPA-recognized for indicating presence of lead but can miss low-level lead under thick paint coats.

False negatives are possible. For high-stakes situations (children present, major paint disturbance), back up with lab testing or XRF.

False positives are rare.

What if I rented and started sanding before testing?

Stop immediately. Don't run fans or HVAC. Wet down the area lightly.

Get tested. If positive, professional cleanup is needed.

Have your child's blood lead level tested if young children were present.

When to call us instead

Renovations involving lead paint require trained crews, containment, and proper disposal. Our team handles lead testing, encapsulation, and remediation as part of older-home renovations.

Book a free 60-minute site visit →

Related Ottawa services

If you're renovating an older Ottawa home, our team coordinates lead testing and containment. Book a free 60-minute consultation.