Facade and window perimeter sealing in Broad Colney, Hertfordshire
Our CSCS-carded applicators take on facade joint and window perimeter sealing on commercial buildings in Broad Colney and the surrounding area. Send photographs or drawings for a fixed quote.
- Discoloured or dirty facade joints
- Leaks at window and door perimeters
- Perimeter sealant that has split or peeled away
Facade sealing in Broad Colney
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
About our facade sealing in Broad Colney
External joints face UV, rain, temperature swings and building movement all year, so they don’t last indefinitely. How long a joint lasts depends on the movement it takes, its exposure, the product and how well it was installed. When the time comes, we cut the old sealant out completely and start again. The enquiries we see most involve draughts around frames and panels and sealant pulling away from frames or panels, on stone and brick facade joints, cladding panel joints and perimeter joints where frames meet the structure. For commercial sealant work in Broad Colney, you deal with one contact from quote to sign-off, for single jobs and planned programmes alike.
Construction in and around smaller places such as Broad Colney is often barn conversions, small groups of houses or extensions to halls and schools. Perimeters, facade joints and internal sealant all need doing properly, however small the scheme.
Whoever the client is, the cover is the same: twelve months on the work we carried out. It doesn’t extend to damage, faults in the building or work by others, and we are upfront about that.
- Where
- Broad Colney (AL2)
- Region
- Hertfordshire
- Guarantee
- 12 months on our workmanship
- Quotes
- A fixed quote before we start
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Honest limits
Not every problem is a sealant problem, and we’d rather tell you before you spend money. It won’t fix:
- Replacing glass or failed glazing units
- Movement beyond what any sealant can handle
- Cracked or spalling substrates that need repair before sealing
If you are not sure, just call 01277 525 020 or email us and we’ll give you a straight answer.
What we seal
- Stone and brick facade joints
- Shopfront frames
- Window and door perimeters
- Perimeter joints where frames meet the structure
- Cladding panel joints
- Coping and flashing joints
Places near Broad Colney
What else we do in Broad Colney
Different surfaces, different methods
Brick and stone facades
Joints in natural stone need care to avoid staining. The specified stone-compatible sealant is what we use.
Perimeter joints at frames and structure
Where framed systems such as shopfronts meet the building structure, there is a perimeter joint to seal. Our work is that perimeter joint.
What happens if it’s left?
Leaving failed perimeter sealant also makes the eventual job bigger: wet edges break down, so repairs may be needed before resealing. Acting at the first sign of splitting keeps the fix simple. Around Broad Colney, it’s better to renew all the failing joints at once, rather than one at a time. Send photographs of each area and we will quote for the lot.
The price depends on how many linear metres there are, how much old material needs removing and the access. Call for a fixed quote once you have the details.
What you get with us
- Colours chosen to suit frames, cladding or finishes where possible
- Standard and matched colours in many product ranges
- Old sealant cut out, never sealed over
- Fully insured, including public liability cover
Take a look at our cost guide or how we’re accredited.
Should maintenance staff do it?
The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are where general trades tend to cut corners.
Redoing a failed joint normally costs more than getting it right at the outset, since all of it has to come out and the faces be cleaned back again. That’s why many clients bring in a specialist from the beginning.
Looking after the joints
Problems stay small when the joints are checked regularly. In particular:
- Brief window cleaners about newly sealed joints
- Add perimeter sealant to planned maintenance checks
- Check the asbestos register before old mastic is disturbed
- Note when each elevation was last resealed
Hold back any cleaning crew until the joints have had their stated cure time. Keep high-pressure jets and strong chemicals away from new sealant and tell your cleaning contractor.
Coordinate facade sealing with other external works. One set-up for several trades saves money and limits disruption.
Facade sealing around Broad Colney: points for this area
The South East is one of the drier parts of the UK. Even so, frost and condensation on steel and glass are common on winter mornings, so external mastic is timed for workable conditions and agreed with the site manager. The area within 2 miles of Broad Colney holds several hotels. When hotels extend or refit, the work is usually squeezed between peak periods, mastic included.
When a school such as Saint Bernadette Catholic Primary School is extended or refurbished, the mastic package is often squeezed into the holidays. On a healthcare site such as Kingsley Green Hospital, 0.8 miles to the south-west of Broad Colney, new blocks and refurbishments go on while the hospital keeps running, so mastic work is sequenced carefully. For contractors on a campus like University of Hertfordshire, which lies north-east of Broad Colney, facade and perimeter sealing has to fit around students and term dates.
Broad Colney is about 3 miles south-east of St Albans, in Hertfordshire. Broad Colney sits inside our coverage and the rest of Hertfordshire, with the same fixed quotes and 12-month guarantee as everywhere else. Across Hertfordshire, 371 places are covered, including Broad Colney. London is covered too, some 17 miles away.
Business premises anywhere in AL2 are within our area for facade joints. Close to Broad Colney, our area also takes in London Colney (1 mile north), Shenleybury (1 mile south-east), Tyttenhanger (2 miles north), Sleapshyde (3 miles north-east) and Colney Heath (3 miles north-east). Nearby towns on our patch include Watford (6 miles south-west), Hemel Hempstead (7 miles west), Stevenage (14 miles north), St Albans (3 miles north-west), Welwyn Garden City (7 miles north-east) and Harpenden (7 miles north).
What’s near Broad Colney
Locally, jobs take us to sites close to The White Lion pub and Samuel Ryder Academy, among other places. The closest station to Broad Colney is Park Street station, about 1.9 miles north-west of the centre. Well-known places in the area include Hilfield Castle (4.5 miles south) and Radlett and District Museum (2.5 miles south). Not far away are Verulamium Lake and Broad Colney Lakes.
On site: what to expect
We schedule the visit to fit the site hours and access windows you give us. While we are working, the area stays contained and tidy, and we check in with your contact before moving on to each new area. Jobs in and around smaller places like Broad Colney are normally planned as a single visit, so we ask for photographs and rough sizes first. That way the right products come on the day.
- We look at the joints, the drawings and the access before pricing.
- The old bead is cut away completely, not overlaid.
- Both faces are cleaned and, where the product needs it, primed.
- Backing rod, or bond-breaker tape in shallow joints, limits the depth.
- A facade-grade sealant rated for the movement goes in, tooled to a concave profile.
- We walk the finished joints with you before handing over.
Before we start on site
- Have the specification and drawings to hand
- Point out any areas we must not close
- Let us know about inductions and permits
Request a quote
A good quote starts with a clear picture: what’s there, how much of it, how we reach it and what’s specified. Send what you have, and we’ll arrange a site visit if anything is unclear.
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Common questions from Broad Colney clients
Will you take on work at estates like Colney Fields Shopping Park, close to Broad Colney?
Yes. Estates, retail parks and business parks around Broad Colney, Colney Fields Shopping Park among them, are all within reach. Photos and a short description are enough for a first look.
Is Broad Colney too far out for you?
Not at all. Broad Colney is within our area. Our area covers London and the South East counties. Where we can, we group nearby jobs to make the most of each trip.
How do we ask for a quote?
You can use the quote form on this site; alternatively, phone 01277 525 020 or email a schedule or drawings. Photos, drawings or a joint schedule help us quote quickly.
Can you fit around our working hours?
The office is staffed Monday to Friday, from 8am until 5pm. Tell us your site hours and access windows and the work will be fitted around them.
Are you CHAS accredited and on Constructionline?
Yes. Mastic Doctor is CHAS accredited and a Constructionline member.
Do you work to architects’ specifications?
Yes. We follow the specification, along with the manufacturer’s installation guidance.
Can you look at water coming in around a frame?
Yes. We look at the perimeter sealant and tell you whether it has failed before quoting. Where the cause seems to be elsewhere, we’d rather tell you than reseal pointlessly.