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How to use wasp nest foam: dusk, distance, and stop

Updated: October 2026

You already have a can, and the dangerous part is the next five minutes, not the checkout. How to use wasp nest foam comes down to time of day, where you stand, and the point where you stop and phone someone. Most painful jobs start because a colony was disturbed in the middle of the day, from underneath, or with a fly spray that was never meant to coat a nest. The [wasp spray comparison](/hub/pest-control/wasp-spray) is where the five listings are priced. This page is the order of work. We did not time a jet in a lab. A qualifying purchase can earn a commission at no extra cost to you.

You already have a can, and the dangerous part is the next five minutes, not the checkout. How to use wasp nest foam comes down to time of day, where you stand, and the point where you stop and phone someone.

Our top picks

Raid Raid 6 × 300 ml

Best overall

Raid Raid 6 × 300 ml
8.9/10about £19.99
View offer
Sanmex Sanmex 3 × 300 ml

Best value

Sanmex Sanmex 3 × 300 ml
7.2/10about £6.22
View offer
Zero In Zero In Ultra Power 600 ml

Alternative

Zero In Zero In Ultra Power 600 ml
7.2/10about £12.94
View offer
On this page
  1. 1.Before you press the trigger
  2. 2.Foam on a nest you can see
  3. 3.A fly-and-wasp can in a room
  4. 4.The next day

Before you press the trigger

Stop if anyone in the household might be allergic. The British Pest Control Association treats that as a reason not to treat the nest yourself. Stop if you are not sure the insects are wasps. Honey bees are a last resort for insecticide under Health and Safety Executive guidance. A suspected yellow-legged hornet is reported with a photograph, not sprayed. Stop if the nest is above head height. Leeds City Council uses that as the line for doing it yourself. Product choice sits in the wasp spray buying guide.

Foam on a nest you can see

Use a nest foam, not a fly aerosol. In this set that is Zero In Ultra Power 600 ml. The listing says late evening, protective clothing, and an eye on wind direction outdoors. Rentokil's UK how-to says not to stand under the nest. An Insecto amateur label, HSE 10273, which is not one of these ASINs, describes about 8 seconds for a nest around 50 cm across and about 12 seconds for around 80 cm. Those seconds are not printed in the Zero In Ultra Power extract, so do not invent an 8-second burst for ZER556. If the foam falls short, you stop. Rentokil UK says wait at least 24 hours before any removal. The reach complaints are on wasp nest killer foam.
Raid Raid 6 × 300 ml

Testsieger

Raid Raid 6 × 300 ml
8.9/10about £19.99
View offer

A fly-and-wasp can in a room

A Raid, Sanmex, or unbranded knockdown can is only for insects already in a room. Tesco's page for a single 300 ml Raid, which is not the amazon.co.uk six-pack, says leave about 15 minutes, then ventilate. That full routine is indoor fly and wasp killer. Do not copy the 8-to-10-second line onto Sanmex or the unbranded pack. Do not aim that room can at a colony.

The next day

An empty nest late in the year can be left. Leeds and Fareham both say old wasp nests are not reused. A ladder is the same mistake as standing under the nest, with a worse exit. If you are stung in the mouth, throat, or eye, NHS advice is 111. Anaphylaxis is 999.

Common questions

What time of day do I spray?
Late evening or early morning, when most of the wasps are in the nest. The Zero In listing says late evening. Rentokil's UK guidance says dusk or late evening. Midday spraying hits a stream of returning workers and stirs the rest.
How far back do I stand?
Far enough that you are not under the nest, and far enough that the jet still reaches the entrance. Rentokil talks about foam from about 2 metres. The Ultra Power title says up to 4 metres, and many of its reviews describe less. Use the distance the can in your hand actually throws. If that distance puts you under the eaves or on a ladder, stop.
Do I knock the nest down afterwards?
Not the same day. Leave it at least 24 hours before any removal, which is Rentokil's UK timing, and only if activity has stopped. Knocking a live nest down is how the colony ends up in the room. An old empty nest can simply be left, because wasps do not reuse it next year.
Wasps are still flying the next morning. Did it fail?
Not always. Insecticide can agitate wasps for hours, and a colony can take days to die down. Heavy traffic after a treatment that actually coated the nest, or a first spray that never reached it, is the failure. Repeat only as the label allows, from the same stand-off.
Can I do this in a loft?
Only if you have a clear exit and the nest is a small, visible job you can treat without trapping yourself. Gravesham highlights loft and eaves risk. Torridge says not to treat a loft yourself. If the nest is above you in the roof space, Leeds would send that to a treatment visit.
Can I do this from a ladder?
No. A ladder puts you under or beside the entrance and removes your exit. Head height is already the DIY limit Leeds publishes. If the nest is only reachable from a ladder, it is a council or BPCA job, not a longer trigger pull.
Is the indoor Raid used the same way as the foam?
No. Indoor Raid is a room spray: close the room, spray, leave about 15 minutes, ventilate. Foam is a stand-back treatment of a nest you can see, then a wait of about a day before you touch anything. Using the Raid pattern on a colony, or the foam pattern inside a bedroom, swaps the two jobs.

Related pages

Best wasp spray

Wasp spray

Wasp spray buying guide: foam, aerosol, or a person

Indoor fly and wasp killer for the room, not a nest

Wasp nest killer foam and the disputed 4 metre jet

Sources

Public UK sources and the amazon.co.uk listings in this set, last checked on 16 October 2026.

  1. HSE, COPR conditions (retrieved 16 October 2026)
  2. HSE, COPR product types (retrieved 16 October 2026)
  3. HSE, honey bees and biocides (retrieved 16 October 2026)
  4. NHS, insect bites and stings (retrieved 16 October 2026)
  5. NHS, anaphylaxis (retrieved 16 October 2026)
  6. BPCA, wasp control (retrieved 16 October 2026)
  7. Leeds City Council, pest control (retrieved 16 October 2026)
  8. NNSS, yellow-legged hornet update (retrieved 16 October 2026)