Hampshire · London and the South East
Electronic Leak Detection in Knowle
Electronic leak detection to pinpoint holes in flat roof membranes across Knowle, with drones and thermal imaging where they help. Call or email for a price.
- Damage from equipment installers
- Stains far from any visible defect
- A flat roof leak that cannot be traced
Signs you need electronic leak detection in Knowle
When the membrane is buried, holes can’t be seen at all. Electronic methods can help on some of these roofs though it depends on the layers.
Problems we come across often include:
- Patched roofs that still leak
- Breaches around outlets and penetrations
- New membranes needing a check before handover
- Failed seams and laps
For businesses in and around places such as Fareham Shopping Centre, a flat roof over a business is out of sight and out of mind until it leaks.
Questions to ask before booking
- How much experience they have with roofs like yours
- Whether any drone flown is registered with the CAA
- How they plan to inspect the roof safely
- Which limits apply to the survey
About our electronic leak detection in Knowle
ELD finds breaches in the membrane, not every cause of water getting in. Water coming through walls, copings, rooflights or plumbing will not show on the test. We will tell you if we think the leak is coming from somewhere else. It will not show water getting in through brickwork or around frames. Our report keeps that distinction clear. You will also know what to check next. We survey liquid-applied waterproofing, green roofs and single-ply roofs, and common reasons people get in touch are new membranes needing a check before handover and damp inside with no sign on the roof.
In a small place like Knowle, a flat roof can stand in the open, which is hard on edges, upstands and joins in the covering. Older felt roofs, often around 15–20 years in life, show it first. Rubber and GRP last longer, though trims and joints still need a look. On an exposed roof, the edges tend to go first.
Nothing in the report is left vague: if work is needed, the report says so clearly, and where it can wait, that is said too.
- Where
- Knowle (PO17)
- Region
- Hampshire
- Prices
- Quoted for your roof
- Reports
- Emailed report with photos and recommendations
- Appointments
- Weekdays, Saturdays and Sundays
- Cover
- Professional indemnity and public liability
- Call
- 07833 053749
- Last updated
- 27 October 2026
What happens if roof problems are left?
Some flat roof leaks come from walls or details. ELD helps rule the membrane in or out, so other causes can be checked. Matching old materials, such as handmade tiles or stone slates, can take time to source. That is one more reason to find defects before they become urgent.
For a price for your roof in Knowle, ring 07833 053749 or drop us an email with the address and some details. We will confirm the figure before booking.
Why book us in Knowle
- We hold a CAA Flyer ID and Operator ID
- Weekday and weekend surveys
- Drones and thermal imaging where it applies
- A photo-illustrated written report
Can I check my roof myself?
A DIY look is useful, but it is not a survey. From the ground, valleys, flashings and the backs of chimneys are often out of sight.
Inside, the loft is a good place to look, with care. Take a torch and only step on boards or joists, checking for stains, damp wood or chinks of daylight.
Flat and commercial roofs around Knowle
Knowle lies within about 4 miles of the sea, so there’s more wind and more salt in the air than further inland. Salt in the air is hard on metal flashings and fixings, and wind catches any loose edge on a flat roof. A number of Hampshire villages keep thatched roofs on their older buildings. Across the South East, older homes tend to have slate or clay tiles, and many later ones concrete tiles. Alongside them, flat-roofed extensions, dormers, garages and commercial units are common almost everywhere.
For site and facilities teams at buildings such as Orchard Lea Infant School, large flat roofs, common on schools and other public buildings, need their outlets, upstands and coverings checked regularly. If you let a flat or house near Fareham station, flat roofs on let property tend to be checked only when they fail, which is the costly way round.
Knowle is about 2 miles north of Fareham, in Hampshire. Wherever you are in Knowle, we can carry out electronic leak detection at your property. Our area takes in places right across Hampshire, large and small. For surveys nearby, see our Portsmouth page.
Surveys in PO17 work the same way as everywhere else we cover. Whether your property is on Serotine Close, Boundary Walk and Park Approach or anywhere close by, we can help. Neighbouring places we cover for electronic leak detection include Funtley (1 mile south), Tapnage (1 mile north-west), Heathfield (2 miles south), Segensworth (2 miles west) and Titchfield Park (2 miles south-west). Within a short drive, we also cover Winchester (13 miles north), Gosport (6 miles south-east), Havant (10 miles east), Eastleigh (9 miles north-west), Horndean (9 miles east) and Totton (13 miles west).
Landmarks near Knowle
We work in homes and buildings around The Miners Arms and The Henry Cort Community College, among other places. Knowle’s nearest station is Fareham station, roughly 2 miles south. Well-known places in the area include Portchester Castle (4.9 miles south-east) and Knowle Hospital (within half a mile north-east). Not far away are Portsdown Hill and Swanwick Lakes.
What happens on the day
Every roof is different; as a rough guide, the survey takes a time that depends on the size of the roof and how it’s built, and we’ll give you a guide when quoting. You are welcome to ask questions while we are there. Older rural homes like those around Knowle can have a main roof, lower lean-to roofs and outbuildings all joined together. Each part is looked at from wherever it can be seen safely.
- First, you let us know about the roof build-up and where water is showing.
- We confirm whether the roof is suitable for electronic testing.
- The testing method is chosen to suit the membrane and build-up.
- The roof is tested and any breaches are located.
- The breaches are recorded with photographs in a report for your roofer.
How to prepare
- Mention any parking restrictions on your street
- Gather any invoices or paperwork from past roof work
- Make sure the loft hatch can be reached
Arrange a survey
We survey roofs seven days a week. To arrange a day that suits you, ring 07833 053749 or drop us an email.
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Nearby places to Knowle
Other services in Knowle
Knowle questions
Is Knowle within the area you cover?
Yes, we do. We cover the whole of London and South East England, and smaller places are part of that. Longer journeys are simply planned beforehand.
Do roofs near the sea, like those around Knowle, take more of a battering?
It can do. Within about 4 miles of the sea, as Knowle is, metal fixings wear faster and gales find any loose ridge or slate.
What does electronic leak detection do?
A sound membrane blocks the test current, but a hole lets it through. That lets us find breaches that are too small to see.
Can you survey a shared roof?
Yes. Shared roofs just need a little more planning, with the building owner or managing agent. Mention it when you contact us and we’ll plan the survey around it.
Do I have to be there for the survey?
That depends on the survey. For inside areas and the roof space, someone has to give us access; we will agree the details when booking.
Will you walk on the roof?
Only where it is safe to do so. We inspect what can be seen safely: from ground level, from windows and vantage points, from the roof space, from the roof itself where safe and by drone where applicable. Anything we cannot see is noted in the report.
Does electronic leak detection work on all membranes?
ELD doesn’t suit every roof. Certain membranes are conductive, and some build-ups lack a suitable layer below. If your roof won’t work, we’ll say so before testing.
Rented homes, blocks and businesses
Surveys can also be booked by buyers’ agents acting for a client. The report is emailed, so it can go straight to your client.
Shared roofs need a little more planning: access has to be agreed with whoever owns or manages the building. Let us know about it when you book and we will plan the visit with that in mind.
Different roofs, different checks
Single-ply membranes
Some single-ply membranes suit electronic testing well but it depends on the product and layers.
Bituminous membranes
Bituminous felt and modified bitumen membranes are common. Whether ELD suits them depends on the build-up.