Popcorn Ceiling Asbestos and Other Older-House Hazards: What to Test Before You Renovate
Updated · 8 min read · By Gilbert Brothers
In this guide
The short answer
For popcorn ceiling asbestos and other older-house hazards, Health Canada says asbestos was mainly used in buildings and homes before 1990, and that material left undisturbed, sealed behind walls or tightly bound in good condition is not a significant risk. Before a renovation, it advises hiring a professional to test, and a qualified asbestos removal specialist if the test finds asbestos. Vermiculite insulation may contain asbestos, and Health Canada says not to disturb it. Lead paint and radon are separate checks. Ontario's asbestos regulation does not apply to the owner of a home they live in, but it does apply to the constructors, employers and workers on a project there. The province's guide also says section 30 of the Occupational Health and Safety Act "applies to the owners of residential properties who undertake projects." Whether it reaches your home is a question for the Ministry of Labour, Immigration, Training and Skills Development.
Whether it is a popcorn ceiling or any other older material, the first question is the same: what is it, and should it be touched at all? Settle that before any wall, ceiling or floor comes down. This page follows Health Canada's guidance and the Ontario government's guide to the asbestos regulation. It gives no instructions for testing, removing or handling any of these materials, and it is general information, not health or legal advice. The facts are as of October 27, 2026.
Five checks to settle before demolition
| Check | When Health Canada says it applies | What it says to do first |
|---|---|---|
| Asbestos in building materials | Mainly used in buildings and homes before 1990 | "Hire a professional to test for asbestos before renovating or remodelling." If one finds asbestos, "hire a qualified asbestos removal specialist to remove it safely." |
| Vermiculite insulation | If you have it in your attic or walls | Do not disturb it or attempt to remove it yourself. Hire professionals trained to handle asbestos if you plan to renovate. |
| Lead paint | Probably built before 1960; the exterior may have it from 1960 to 1990; houses built after 1990 should not contain lead | Have the paint tested. A certified inspector can measure paint lead levels. Health Canada also names a testing laboratory route; this page gives no sampling steps. |
| Radon | Every home in Canada has some | A long-term test of three months. Above 200 becquerels per cubic metre, hire a certified radon mitigation professional. |
| Mould | Visible mould, stains or too much moisture | Consider hiring a professional for large areas, or mould that keeps coming back. |
The sources are Health Canada's Asbestos and your health, renovation chemical safety, Lead-based paint and Take Action on Radon pages.
Asbestos: which materials, and how old
Health Canada lists these older materials as ones that may contain asbestos: house siding, cement and plaster, floor and ceiling tiles, roofing products, and insulation, including around hot water pipes and tanks. It also lists surface treatments such as paint, putty, drywall, caulking, sealants and spackling. Before 1990, it says, asbestos was mainly used for insulating buildings and homes and for fireproofing.
Ontario's guide gives its own dates. Its list of suspect materials says asbestos was widely used in sprayed-on material and in pipe and boiler insulation in Ontario until 1973, and that many other asbestos-containing materials stayed in use until the mid 1980s. It adds that the list is not all-inclusive.
Three age categories in Statistics Canada's 2021 Census Profile for the City of Peterborough (1960 or before, 1961 to 1980 and 1981 to 1990) add up to 27,175 of 35,980 occupied private dwellings (25 per cent sample data). That is a count of homes by age, not of homes that contain any of these materials, and the last category runs to 1990 while Health Canada's asbestos line is "before 1990."
Neither source uses the words "popcorn ceiling". Ontario's list names acoustical plaster, decorative plaster, textured paints and coatings, spackling compounds and joint compounds, and its chapter on procedures refers to "removal of asbestos-containing ceiling texture". Neither source says whether a popcorn ceiling is one of these. Whether a particular ceiling contains asbestos is what a test answers.
Health Canada says asbestos fibres can be released during renovation and demolition work such as drilling, sawing, sanding, scraping, removing and breaking apart. It also says there are no significant health risks if the material is left undisturbed, isolated in an attic, sealed behind walls and floorboards, or tightly bound in products in good condition. That is why the question comes before the plan. A ceiling left alone and a ceiling that is disturbed are different decisions.
Vermiculite insulation
Health Canada says vermiculite-based insulation may contain asbestos. If you have it in your attic or walls, it says not to disturb it or attempt to remove it yourself, and to hire professionals trained to handle asbestos if you plan to renovate.
Lead paint
Health Canada's two pages on older homes give the same outer line, 1990, in different words. Its lead-based paint page says a home "probably contains lead-based paint if it was built before 1960." From 1960 to 1990 the exterior may contain it, and interior paint "may also contain lead in smaller amounts that could still be harmful, especially to young children." Houses built after 1990 "should not contain lead." Its renovation safety page says "Homes built before 1991 may have lead-based paint or have base coats of lead-based paint beneath the newer ones."
Health Canada says to have the paint tested if you think it may contain lead, and to consider hiring a professional to remove it. It also says that "leaving lead-based paint alone is safer than removing it" in some cases, as long as it is not chipping or within the reach of children. It says not to sand, scrape or burn off leaded paint because that can release harmful dust. The risk is greatest for children.
Radon
Health Canada says a long-term test of three months is the most accurate way to find out your radon level. The Canadian guideline is 200 becquerels per cubic metre. Above it, a certified radon mitigation professional can lower the level, and a system can be installed in less than a day. On renovations Health Canada says: "If your radon level is high, it's best to reduce it before or during renovations." A three-month test takes a season, so it belongs at the start of the plan. Peterborough Public Library's radon detector loans are covered in Finishing a Basement in Peterborough.
Who does what
| Who | What the sources say |
|---|---|
| You, as the owner | Health Canada advises hiring a professional to test before you renovate. Ontario's guide says its asbestos regulation does not apply "to the owner of a private home that is occupied by the owner or the owner's family," or to the owner of a residential building with no more than four units, one of which the registered owner or family occupies (O. Reg. 278/05, s. 2(4)). |
| A tester | Health Canada says "a professional" tests for asbestos, a certified inspector for lead, and a certified radon measurement professional or a long-term kit for radon. |
| A removal specialist | Health Canada says "a qualified asbestos removal specialist" removes asbestos that a test finds. |
| The contractor and crew | Ontario's guide says the regulation "does apply to constructors, employers and workers engaged in private construction projects and repair or maintenance of such buildings." |
The guide's application chapter says the regulation applies whether or not asbestos is known or suspected: material that may be disturbed has to be examined, or be treated as though it contains asbestos. If suspect material turns up after work has started and was not identified in the report, the guide says the constructor or employer must immediately notify a Ministry of Labour inspector and the building owner, among others. Apart from work to find out what the material is, no work is to be done on it unless it is determined to be asbestos-containing or the work is done as though it were.
The same chapter adds that section 30 of the Occupational Health and Safety Act requires the owner of a project to prepare a list of designated substances on the project, including asbestos, before tendering the project. (The Act itself says "Before beginning a project" in section 30(1).) The chapter says this section "applies to the owners of residential properties who undertake projects." Whether it reaches your home is a question for the Ministry of Labour, Immigration, Training and Skills Development.
For examinations under the regulation, the guide's chapter on examinations names a U.S. Environmental Protection Agency test method and sets a minimum number of bulk samples per area of uniform material. That rule is for people carrying out an examination under the regulation, and this page gives no sampling steps. It is still a fair question to put to anyone who quotes you a test: how many samples, and why.
Test before you collect quotes
The guide says reports go to bidders when work is arranged "so that the costs of these regulatory obligations can be included in the bids and so that any other necessary measures/procedures can be implemented before the work begins." The regulation's report duty does not apply to the owner of a home they live in (s. 2(4)), but results in hand before the quotes arrive mean every estimate prices the same facts.
List what the plan will touch
Ceilings, floors, insulation, painted surfaces and walls. Note when that part of the house was built.
Decide what you will leave alone
Health Canada says material left undisturbed, sealed behind walls or tightly bound in good condition is not a significant risk.
Have professionals test what the plan would disturb
The table above names who tests each hazard.
Give the results to every contractor who quotes
Ask in writing who arranges and pays for testing if something turns up mid-job, and what happens to the schedule.
The order of the rest of the work is in Renovating Several Rooms at Once. Which office issues a building permit is in Renovation Permits Around Peterborough. Rules differ by property and change over time, so confirm with the building office that issues your permit before you start.
If you are planning a full-room renovation, Gilbert Brothers gives a free estimate at your home. Send a few details through the contact page. The renovations, basement renovations and main floor renovations pages describe the service.
Frequently asked questions
Does a popcorn ceiling contain asbestos?
Neither Health Canada nor Ontario's guide mentions popcorn ceilings by name. Ontario's guide refers to "asbestos-containing ceiling texture." Whether a particular ceiling contains asbestos is what a professional test answers, which Health Canada advises before renovating.
Should I scrape a popcorn ceiling before it is tested?
Health Canada lists scraping among the activities that can release asbestos fibres and says to avoid disturbing materials that may contain asbestos. It advises hiring a professional to test before renovating and, if asbestos is found, a qualified asbestos removal specialist. This page gives no steps for scraping or removing anything.
Is vermiculite insulation dangerous?
Health Canada says it may contain asbestos, and not to disturb it or attempt to remove it yourself.
Does Ontario's asbestos regulation apply to my house?
Ontario's guide says it does not apply to the owner of a private home occupied by the owner or the owner's family. It does apply to constructors, employers and workers on private construction projects in such buildings. For your own situation, ask the Ministry of Labour, Immigration, Training and Skills Development. That is about who has legal duties, not about whether a job is safe. Health Canada's advice to test before renovating is separate.