Golden Home Inspections offers home hazard testing for asbestos, vermiculite insulation, radon and mould across Toronto and the Greater Toronto Area. Yama Nehan, a Certified and Registered Home Inspector with about 15 years of home inspection experience, looks for suspect materials and conditions in your home and recommends which tests make sense. Samples and radon detectors are analysed by accredited labs.

Our job is to find what deserves a closer look, test for it and help you understand the results.

Key takeaways

  • Asbestos and vermiculite: You can’t confirm asbestos by looking. A sample has to be analysed by a lab. Health Canada advises leaving suspect material undisturbed and having it tested before you renovate.
  • Radon: Health Canada’s guideline is 200 Bq/m³. It recommends a long-term test of at least 3 months, ideally during the heating season.
  • Mould: Health Canada doesn’t recommend air testing for mould in most homes. Finding and fixing the moisture source comes first.
  • How we help: We inspect, flag what we find and test for it, with samples analysed by accredited labs. Then we explain the results in plain language.
  • Where: Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, Pickering, Ajax, Whitby, Oshawa and nearby GTA cities.

What is home hazard testing?

Home hazard testing checks a house for four common concerns that you usually can’t confirm by eye: asbestos, asbestos in vermiculite insulation, radon gas and mould. Each one needs a different test method, and the analysis is done by an accredited lab.

A standard home inspection looks at the visible condition of a home. Hazard testing goes one step further, for materials or conditions the inspection flags or that you want confirmed before buying or renovating.

Why start with a home inspector?

A home inspector knows where these materials and conditions tend to show up. That includes the attic, the basement, around old heating pipes, under flooring and wherever moisture collects. Starting with an inspection means testing is aimed at the areas that matter, rather than guessing.

Yama inspects the home, notes suspect materials and moisture problems, and recommends which tests make sense. Our hazard testing follows from there, with samples analysed by accredited labs, so you deal with one company from inspection to results.

Asbestos testing

What is asbestos, and why does it matter in older homes?

Asbestos is a group of fibrous minerals that were once used in building materials for insulation and fire resistance. Health Canada notes that before 1990, asbestos was mainly used to insulate buildings and homes. Products containing asbestos are now prohibited in Canada, but it can still be found in older building materials.

According to Health Canada, there are no significant health risks when asbestos-containing materials are left undisturbed, sealed behind walls or floorboards, or tightly bound in products in good condition. The concern is fibres released during drilling, sanding, scraping, cutting or removal.

Where can asbestos show up in GTA homes?

Health Canada lists these older building materials as places asbestos may be found:

  • Floor and ceiling tiles
  • Plaster, cement and some drywall compounds, putty, caulking and sealants
  • Insulation, including around hot water pipes, tanks and older heating systems
  • House siding and roofing products such as tar paper, shingles and felt

In the GTA, this usually means homes built before 1990. These include post-war bungalows, 1960s to 1980s detached homes and older semis in Toronto, Mississauga, Brampton, Vaughan, Markham and Oshawa.

How does asbestos testing work?

Asbestos testing means taking small samples of suspect material and having a lab analyse them. You can’t confirm asbestos by looking at a material. With our asbestos testing, samples of suspect material are analysed by an accredited lab.

In Ontario, O. Reg. 278/05 covers asbestos on construction projects and in building repair and alteration work. Under that regulation, material with 0.5% or more asbestos by dry weight is treated as asbestos-containing material. Contractors and workers must follow its procedures whether or not asbestos is expected. Testing before a renovation helps you and your contractor plan the work properly.

Vermiculite insulation testing

What is vermiculite insulation?

Vermiculite is a pebble-like, mica-based mineral that was poured loose into attics and wall cavities as insulation. It is usually greyish-brown or silver-gold. Health Canada advises that vermiculite from the Libby Mine in Montana, sold as Zonolite Attic Insulation and possibly other brands in Canada, may contain asbestos.

Health Canada says not all vermiculite insulation contains asbestos. It is prudent to assume vermiculite produced before 1990 may contain some, unless testing shows otherwise.

Where is vermiculite found in GTA homes?

Vermiculite is most often found loose in the attic of older detached homes and bungalows. Sometimes it is under newer insulation that was added on top of it, or inside wall cavities. During an inspection, Yama checks the attic where it is safely accessible and notes any loose-fill insulation that looks like vermiculite.

This matters most in established areas of Vaughan (such as Woodbridge and Thornhill), Markham (such as Unionville and Markham Village) and Brampton (such as Bramalea). Many homes in these neighbourhoods were built before 1990.

What does Health Canada advise if you have vermiculite?

Health Canada’s advice is calm and practical:

  • Don’t disturb it, and don’t try to remove it yourself.
  • Don’t use the attic for storage, and keep children out of it.
  • Seal gaps around the attic hatch, light fixtures, baseboards and outlets.
  • Hire professionals trained to handle asbestos if you plan to renovate or remove it.

How does vermiculite testing work?

A sample of the insulation is taken with care to avoid disturbing it, and an accredited lab analyses it. The result tells you whether to plan for professional removal before attic work, re-insulation or renovation, or whether no special handling is needed.

Radon testing

What is radon?

Radon is a colourless, odourless radioactive gas that comes naturally from the ground. It can enter a home through foundation cracks, floor drains, sump pits and gaps around pipes. Health Canada says the only way to know your home’s radon level is to test.

What is Health Canada’s radon guideline?

Health Canada’s guideline for radon is 200 becquerels per cubic metre (200 Bq/m³). If the average annual level in a normal occupancy area is above 200 Bq/m³, Health Canada recommends taking corrective action to reduce it within 1 year.

How does radon testing work?

Health Canada recommends a long-term radon test lasting at least 3 months (91 days). At least 91 days should fall in the heating season, generally fall and winter, when windows and doors are closed. The detector goes in a regularly used room on the lowest lived-in level of the home, such as a basement bedroom, family room or office.

Our radon testing uses a long-term detector placed on the lowest lived-in level for the full test period. When the test ends, the detector is analysed by an accredited lab.

When should you test for radon?

Any home in the GTA can be tested, whether it’s a detached house, townhouse or ground-level unit. Health Canada also suggests re-testing after renovations that affect the structure or ventilation, such as finishing a basement, installing a new furnace or doing energy retrofits.

Mould assessment and testing

Does every home need a mould test?

No. Health Canada does not recommend testing the air for mould in most homes. Mould spores are always present in air, and an air test doesn’t identify the cause. The more useful first step is to find the moisture source and assess how much mould is visible.

How big a mould problem needs a professional?

Health Canada classifies visible mould by area:

  • Small: Three or fewer patches, with a total area under 1 m². Can be cleaned using proper precautions.
  • Medium: More than three patches, or a total area between 1 m² and 3 m². Expert assessment is recommended.
  • Large: A single patch larger than 3 m². Expert assessment and cleanup are required.

Where does mould show up in GTA homes?

Mould is common in basements with past leaks or high humidity, in bathrooms without working exhaust fans, around windows with condensation, and in attics with ventilation or roof leak problems. Finished basements and basement apartments deserve a close look, because moisture can hide behind finishes.

How does our mould testing work?

Yama inspects for signs of moisture and mould, including stains, odours, condensation and leak history, and notes where the problem likely comes from. If concerns remain after the inspection, or there may be hidden mould inside walls, we can test for mould, and the samples are analysed by an accredited lab.

Home hazard testing at a glance

Hazard Typical homes and locations Test method Who analyses
Asbestos Homes built before 1990: old floor and ceiling tiles, plaster, pipe and heating insulation, some siding and roofing Bulk samples of suspect material Accredited lab
Vermiculite Older detached homes and bungalows: loose-fill attic or wall insulation Bulk sample of the insulation Accredited lab
Radon Any home type: tested on the lowest lived-in level Long-term detector, at least 91 days, ideally in the heating season Accredited lab
Mould Damp basements, bathrooms, attics and areas with leak history Visual and moisture assessment first; sampling only if concerns remain Accredited lab

How does home hazard testing work?

  1. Call or email us. Tell us about the home, your concern and whether you’re buying, selling, renovating or staying put.
  2. Inspection first. Yama inspects the home or the areas of concern and notes suspect materials, moisture and conditions.
  3. Testing plan. We recommend which tests make sense, and which don’t, so you only test what’s useful.
  4. Testing and lab analysis. We test for what’s needed, and samples and radon detectors are analysed by accredited labs.
  5. Results explained. You get the lab results. Yama walks you through them in plain language, including what to discuss with an abatement, mitigation or moisture-repair professional.

Home hazard testing across the GTA

Golden Home Inspections serves home buyers, sellers, owners and landlords across the Greater Toronto Area.

Book home hazard testing in Toronto and the GTA

If you’re buying an older home, planning a renovation or want to know your radon level, start with an inspection. Golden Home Inspections will tell you what’s worth testing and test for it, with samples analysed by accredited labs.

Buying a home? Pair hazard testing with a pre-purchase home inspection, or see what a home inspection includes in Ontario.

Frequently asked questions

Who analyses the samples?

Accredited labs analyse the samples and radon detectors from our hazard testing. Yama Nehan, a Certified and Registered Home Inspector, identifies suspect materials and conditions during the inspection, recommends which tests make sense and explains the results in plain language.

Can a home inspector tell if a material contains asbestos just by looking?

No. A home inspector can flag materials that may contain asbestos, but only lab analysis of a sample can confirm it. Health Canada advises having a professional test suspect materials before renovating.

Is vermiculite insulation always dangerous?

No. Health Canada says not all vermiculite contains asbestos, and vermiculite that is sealed off and left undisturbed poses very little risk. It advises not disturbing it and having trained professionals handle any removal or renovation that would disturb it.

What radon level is too high in Canada?

Health Canada’s guideline is 200 Bq/m³. If your home’s average annual radon level in a normal occupancy area is above that, Health Canada recommends taking action to reduce it within 1 year.

How long does a radon test take?

Health Canada recommends a long-term test of at least 3 months (91 days). At least 91 days should fall in the heating season, generally fall and winter.

Should I test the air in my home for mould?

Usually not. Health Canada does not recommend air testing for mould in most cases. The first step is to find and fix the moisture source and assess how much mould is visible. A qualified professional may recommend sampling if concerns remain or hidden mould is suspected.

Do I need asbestos testing before a renovation in Ontario?

Health Canada recommends hiring a professional to test for asbestos before renovating. In Ontario, O. Reg. 278/05 sets asbestos rules for construction, repair and alteration work, and contractors must follow it. Testing first helps you and your contractor plan the work.

Which GTA cities do you serve for home hazard testing?

Golden Home Inspections offers home hazard testing across Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, Burlington, Milton, Pickering, Ajax, Whitby, Oshawa, Aurora and Newmarket.

Sources: Health Canada, Asbestos and your health; Health Canada, Vermiculite insulation containing amphibole asbestos; Health Canada, Radon guideline and Guide for radon measurements in homes; Health Canada, Guide to addressing moisture and mould indoors; Government of Ontario, O. Reg. 278/05 and Asbestos in the workplace. This page is general information, not medical or legal advice.