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Home Mould Testing FAQS

If you’re concerned about the potential of harmful mould in your home but have never done a mould test before, it’s likely you’ll have questions. At Untold Mould, we created our home mould testing kit to make testing as easy as possible. Read our frequently asked questions about mould testing to find out more.

The UNTOLD MOULD Test Kit uses spore traps, the most common method for professional mould air sampling and mould testing. That’s why we refer to it as testing “like an expert!”
The UNTOLD MOULD air sampling and mould testing cassettes are also known as spore traps. They function as filters that capture spores and other microscopic particles drawn through them by the reusable air sampling device.
The UNTOLD MOULD air sampling and mould testing cassettes are analysed by AI-powered, lab-assisted software, which uses direct microscopic analysis to count and classify the different spores present in each sample. Our report covers all known spore-producing moulds and fungi (around 100,000 species). Our software analyses the lab results to detect any unusual types and the density of indoor mould. The findings, along with spore counts, are shown in your final report as: Green = not present, Orange = moderate presence, Red = significant presence.
You won’t need an expert to understand our report. It provides clear, easy-to-read results along with the raw lab data, which will be helpful if you need to hire a mould remediator as they likely won’t need to conduct a test themselves. Our reports are colour-coded Green, Yellow, Orange, and Red, with simple explanations for each. Green means your indoor air is similar to the outdoor sample, with no signs of mould growth. Orange indicates moderate evidence of indoor mould growth and suggests you should consider further investigation, and may be manageable yourself. Red is the highest alert, showing significant indoor mould growth meaning we strongly recommend consulting a mould expert and taking immediate action. If you or anyone is experiencing symptoms you think are related to mould, we recommend seeking medical advice.
Pre-Testing Prep: Keep your windows and doors closed as much as possible a few days before testing and ensure your air filters and purifiers are turned off during this time. If the room you’re testing has been renovated recently, ensure any debris is removed. Day of Testing: We’d recommend choosing a day when it's not raining or snowing for the best results. Keep your heating and/or air con systems on to allow the air to circulate for accurate readings. You should also avoid mowing the grass, raking leaves, or carrying out DIY work. Pump Placement: Place the pump on a clean surface at least 30" off the ground (the same applies for the outside sample).
Generally speaking, one cassette is needed per room, so if you’re testing multiple normal-sized rooms, use one cassette per room. For larger rooms, like an attic or loft over 2000 square feet, you may need multiple cassettes to test different areas for accurate results.If you need more mould testing cassettes, refills can be purchased here
The green-labelled air sampling cassette is for testing outdoors.
You need to take an outdoor air sample in order to get a baseline reading to compare against your indoor samples. This is because mould spores can get into your home through cracks in windows and doors.
Whilst you can use the same mould testing device to test multiple buildings, you will need to purchase a refill kit for each building you need to test.This is because you need an unused, green outdoor air sampling cassette for each building you test, considering the environment and spores are different in each location as well as fresh cassettes for each room.Even if the two buildings you need to test are fairly close on the same property, environmental factors and different spores may be present in each location.
Once your air sample cassette arrives at our lab, you'll receive a notification via email and your personalised AI-powered mould report will be generated within three business days and delivered via email.
Every home contains some mould, so it’s a case of which types of mould are in your home and the quantity.If your report is showing high quantities of mould, you’ll need to take action immediately. The first step is to contact a mould remediation professional who will find the source of the mould, and then they’ll recommend the next steps. This could be a simple DIY solution or more comprehensive construction work.If there are only smaller amounts of “safe” mould, we recommend getting an air purification machine, as it can remediate mould without further work.
It is possible for your report to come back as “incomplete”, or in the rarest of cases, the report cannot be generated at all. This is often due to the mould testing cassette getting contaminated with other materials like dirt and dust, or a rare case of the cassette itself being faulty.
Whilst it is possible, it’s not something we’d recommend because a car is an inconsistent environment, being more at risk of contamination from the elements due to doors opening and closing constantly.Instead, we’d recommend the “sniff test”. If your car has a musty, earthy smell, it could be due to spillages or mould build-up behind the air conditioning and heating vents.In which case, we’d recommend getting your car air con system serviced and recharged, and getting your car fully cleaned, inside and out.
Our home mould testing device is designed to be an affordable first step in detecting whether there’s mould present in your home, as hiring mould remediation can be costly and a waste of money if there’s little to no mould present.Whilst Untold Mould’s report is comprehensive and can give you an idea of mould exposure, it can’t be used in place of a professional who can use specialist equipment to test for hidden mould growth behind walls.To ensure accurate usage of the device, please ensure you read the starter guide thoroughly and get in touch if you have any questions.
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Still Have A Question?

Our customer service team is available via email Monday-Friday, 9AM - 5 PM excluding holidays. Send us an email at mould@untoldmould.com.

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