The Mastic Doctor team standing beside their branded vans outside an office building
Hampshire · England

Facade and window perimeter sealing in High Cross, Hampshire

Facade joint and window perimeter sealing on commercial buildings in High Cross and across Hampshire. CHAS accredited and fully insured, with a 12-month guarantee.

  • Old perimeter mastic that has dried out
  • Sealant pulling away from frames or panels
  • Water coming in around window frames
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
Constructionline member
£5m PL insurance

Facade sealing across High Cross

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

Work for main contractors and building owners

As a CHAS accredited contractor and Constructionline member, we’re straightforward to vet for your supplier list. Our insurance certificate can be sent along with the quote.

Building owners and managing agents use us on sealant work across single buildings or whole portfolios around High Cross. One quote can cover more than one site, which keeps the paperwork simple.

Facade sealing in High Cross

Some clients need every window on a block resealed; others need a few leaking frames sorted. Either way, the method is the same: old sealant out, faces cleaned, depth set and a new bead tooled in. A 12-month guarantee applies to our workmanship. Site teams most often ask us about water coming in around window frames and new sealant peeling off old mastic, on perimeter joints where frames meet the structure, shopfront frames and coping and flashing joints. For commercial sealant work in High Cross, you deal with one contact from quote to sign-off, for single jobs and planned programmes alike.

Sites around smaller places like High Cross can be a fair drive from suppliers, so we come with everything the package needs. Drawings, photographs and the programme let us give a fixed quote.

Work we carry out comes with a 12-month guarantee. If an installation problem shows up, speak to us on 01277 525 020 or send photos by email and we will arrange a return visit.

The Mastic Doctor team beside their liveried vans in front of an office building
Location
High Cross (GU32)
Region
Hampshire
Guarantee
12 months on our workmanship
Quote
Fixed quote, scope in writing
Phone
01277 525 020
Last updated
3 November 2026

Your questions answered

Do you take on work at healthcare sites like Petersfield Hospital?

Yes. We work in healthcare settings as well as offices and schools. Work is phased so departments keep running, under the site’s own rules.

Can you keep pace with our programme in High Cross?

Yes. The mastic is planned around your key stages. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.

How is access to upper-level joints handled?

That comes down to the access arranged for the job. Share what access exists or is planned when you send details, and we will agree the approach together.

What do you charge?

Every job gets its own fixed quote. For yours, call the office on 01277 525 020 or send details through our quote form.

Do you take on multi-site work?

Yes. We take on portfolio and planned maintenance work, planned site by site to suit how each building is used.

Can you look at water coming in around a frame?

Yes. We check the sealant joints and report what we find. If the water seems to come from a roof, sill or the glazing unit instead, we say so.

How long before the joints can be used?

That comes down to the sealant and the temperature. Some products skin over quickly but need longer to cure fully, so we’ll confirm the curing time on the day.

How the job changes by surface

Brick and stone facades

Stone can absorb plasticisers from the wrong sealant. We use a product suitable for the stone where the specification names one, and mask the edges carefully.

Window and door perimeters

Perimeter joints move as frames expand and contract in the sun. The rod limits depth, leaving the bead able to flex without tearing.

Our process

On arrival, we sign in, go through any site induction and check how permits are handled. Floors, finishes and fittings next to the joints are covered before any cutting starts, and the work normally takes anything from a single day to several weeks, depending on joint lengths, access and the weather. For a building around High Cross, tell us how to find it and who will meet us. Add it to your enquiry and we’ll build it into the plan.

  1. We look at the joints, the drawings and the access before pricing.
  2. The old bead is cut away completely, not overlaid.
  3. Both faces are cleaned and, where the product needs it, primed.
  4. Closed-cell rod fixes the depth, and the sealant grips two sides only.
  5. The new sealant goes in and is tooled firmly onto both faces.
  6. The completed runs are checked with you, then the 12-month guarantee applies.

Getting the site ready

  • For older buildings, check the asbestos register before work
  • Share your working hours and any access restrictions
  • Have the specification and drawings to hand

Getting a fixed quote

A handful of photos and a postcode is the fastest way to a quote. Send them through the quote form, or call 01277 525 020 or email the details over if you’d rather talk the job through.

Ask for a quote

Related advice

When something else is needed

A proper diagnosis includes knowing what sealant can’t do. You’ll hear from us if the cause turns out to be one of these:

  • Arranging specialist high-level access, which is planned with the client
  • Cracked or spalling substrates that need repair before sealing
  • Damp caused by condensation inside the building

If in doubt, give us a call on 01277 525 020 or send details through our quote form and we’ll say what we think before you book.

What we seal

  • Window and door perimeters
  • Perimeter joints where frames meet the structure
  • Coping and flashing joints
  • Cladding panel joints
  • Stone and brick facade joints
  • Shopfront frames

Maintenance after handover

Your facilities or cleaning team can help the joints last. Pass these on to them:

  • Keep the sealant details on the building file
  • Inspect facade joints on a regular cycle
  • Insist on a full cut-out when joints are renewed
  • Avoid harsh cleaners on facade sealant

Let the new sealant cure before washing the facade or windows near it. Pressure washers and harsh cleaners can damage a fresh bead, so brief your window cleaners.

Don’t wait for a full elevation to fail. Small repairs stop small leaks becoming large ones inside the building.

Doing it in-house

Paperwork matters too. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we will confirm the paperwork you need with the quote.

Redoing a failed joint typically 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.

Contractors’ notes for High Cross

High Cross sits in one of the drier corners of the country, the South East. Winter mornings still bring frost and condensation on frames and panels, so the external programme keeps a little slack. High Cross lies roughly 50 miles out from central London. Commuter-belt towns tend to see a steady flow of new flats, offices and commercial schemes, and each scheme needs its mastic sealed to programme.

School extensions, at buildings such as Froxfield Church of England Primary School, normally run to the summer holidays, mastic included. For a contractor working at a hospital such as Petersfield Hospital (2.8 miles south-east of High Cross), perimeter and facade sealing is planned around patients and deliveries.

High Cross is about 3 miles north-west of Petersfield, in Hampshire. Commercial clients in High Cross use us for work on facade joints, as part of our coverage of Hampshire. High Cross is one of 723 places we cover in Hampshire for facade joints. Our Portsmouth page has more on work in that area (16 miles or so).

Commercial sites across GU32 are covered for facade joints. For a building on High Cross Lane, Dellfield and Deans Dell or nearby, send details and we will quote for facade joints. Sites close to High Cross are covered too, including Froxfield Green (1 mile south-west), Oakshott (2 miles north-east), Langrish (2 miles south), Stroud (2 miles south) and Steep (2 miles east). Bigger towns within reach include Winchester (15 miles west), Havant (12 miles south), Horndean (9 miles south), Alton (8 miles north), Waterlooville (11 miles south) and Petersfield (3 miles south-east).

Landmarks near High Cross

The nearest railway station is Petersfield station, roughly 2.6 miles south-east of the centre. Other landmarks nearby include Petersfield Community Hospital (2.7 miles south-east) and Bear Museum (3.1 miles south-east). Not far away are Wheatham Hill and Liss Riverside Railway Walk South.

Map of High Cross © OpenStreetMap contributors
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