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

Thorney Island facade sealing

We carry out facade joint and window perimeter sealing on commercial buildings in Thorney Island. Send details for a fixed quote.

  • Air leaks through failed facade joints
  • Perimeter joints where frames meet the structure
  • Gaps between rainscreen or cladding panels
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
London, the South East & Scotland
Constructionline member
Fully insured: £5m PL

Facade sealing near Thorney Island

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

When something else is needed

Sealant solves a lot, but not everything, and we’re upfront when that’s the case. It won’t fix:

  • Replacing glass or failed glazing units
  • Cracked or spalling substrates that need repair before sealing
  • Joints whose design needs changing by the specifier

If you are not sure, just ring 01277 525 020 or email a schedule or drawings and we will give you a straight answer before you book.

Joints and surfaces we work on

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

About our facade sealing in Thorney Island

Installing framed glazing systems isn’t part of our work. What we seal are the joints around them: perimeter joints where frames meet the structure, panel joints and window perimeters, using sealants classified for facade or glazing use. If you’re dealing with previous reseals run over old sealant and gaps between rainscreen or cladding panels, we can help, whatever the surface. Facilities teams, main contractors and managing agents in Thorney Island tend to want the same three things: a clear scope, tidy work and joints that don’t fail again.

Around smaller places like Thorney Island, building work normally means conversions of farm buildings, a few new houses or an extension to a hall or school. Perimeters, facade joints and internal sealant all need doing properly, however small the scheme.

Guaranteed is the last step of every job. Our workmanship is backed for 12 months, and the quote explains what it covers.

Place
Thorney Island (PO10)
Region
West Sussex
Guarantee
12 months on every job
Quote
Fixed quote, scope in writing
Call
01277 525 020
Updated
3 November 2026
Mastic Doctor team members lined up next to their branded vans outside an office building

Building owners, agents and FMs in Thorney Island

Main contractors use us as their sealant subcontractor, on new build and refurbishment alike. Programme, specification and site rules come first.

We work for building owners and managing agents on everything from one building to a spread of sites around Thorney Island. One quote can cover more than one site, so there’s one set of paperwork to deal with.

When to bring in a specialist

Some joints are best left to specialists: for instance fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.

For a quick touch-up, site staff may be fine, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.

Facade sealing around Thorney Island: points for this area

Thorney Island is within about 1 mile of the coast. Schemes this close to the sea see their facade joints tested by wind and rain from the day they’re sealed, so we check the specified product suits the exposure before the first bead. Thorney Island sits in one of the drier corners of the country, the South East. Still, external mastic needs dry faces within the maker’s temperature limits, which isn’t every day, so the external programme keeps a little slack.

Older buildings in the area around Thorney Island, such as Warblington Castle, which lies north-west of Thorney Island, need care when sealed: the product has to suit soft or historic materials. When units on a site such as Finchwood Farm Industrial Estate (1.9 miles south-west of Thorney Island) are refurbished or reclad, the panel joints and window perimeters are part of the mastic package.

Thorney Island is about 4 miles south-east of Havant, in West Sussex. Looking for facade sealing in Thorney Island? We can help. We work across 373 places in West Sussex, from busy centres to rural villages. There’s a separate page for Portsmouth, roughly 7 miles from Thorney Island.

Postcode districts covered here: PO10 for facade joints. Streets here include Hunter Road, Emsworth Road and Spartan Close, and sites on any of them can send details for a fixed quote. Nearby places we also cover include West Thorney (1 mile south-east), North Hayling (1 mile west), Tye (1 mile south-west), Northney (1 mile west) and Emsworth (2 miles north) for facade joints. Nearby towns on our patch include Bognor Regis (11 miles east), Chichester (7 miles east), Selsey (9 miles south-east), Portfield (7 miles east), Yapton (14 miles east) and East Wittering (5 miles south-east).

Near you in Thorney Island

We work on buildings around Bourne Community College and Eames Farm and the streets around them. For rail, the closest station is Southbourne station, about 1.8 miles north-east. Nearby you will also find Havant War Memorial Hospital (3.2 miles north-west) and Emsworth Museum (1.6 miles north). The countryside around Thorney Island includes Nutborne Marshes.

Map of Thorney Island © OpenStreetMap contributors

Your questions answered

Do you take on work at healthcare sites like Havant War Memorial Hospital?

Yes. Healthcare sites are among the places we work. Each area is agreed with the ward or department and the estates team in advance.

Is Thorney Island too far out for you?

Not at all: smaller places are covered as well as towns. We work across Greater London and the South East. Good photographs up front let us bring everything on the first visit.

Will you just go over the old sealant?

No. Failed sealant is removed and the faces cleaned back to sound, dry material first, since fresh sealant will not bond reliably to aged material.

What will the job cost?

There isn’t a price list, because every site is different. With photos or drawings, we can give you a fixed quote.

Do you replace failed glazing units?

No. Glazing, windows and glass replacement aren’t part of our work. We seal the joints around them, such as perimeter joints where frames meet the structure.

Can you follow the specification on our project?

Yes. The specification and the manufacturer’s installation guidance are what we work to, and we raise anything unclear before work begins.

How long before the joints can be used?

The product and site conditions decide that. Some products skin over quickly but need longer to cure fully, so we’ll confirm the curing time on the day.

Our process

Working in a building that stays open takes some planning. We sign and contain the area we’re in, keep walkways clear and move on in phases so staff and visitors can carry on around us. For a building around Thorney Island, tell us how to find it and who will meet us. Add it to your enquiry and we will build it into the plan.

  1. First we review photographs, drawings or what we saw on a visit, and agree how each joint will be reached.
  2. The old bead is cut away completely, not overlaid.
  3. Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
  4. Backing rod, or bond-breaker tape in shallow joints, limits the depth.
  5. A facade-grade sealant rated for the movement goes in, tooled to a concave profile.
  6. We walk the finished joints with you before handing over.

What we need from you

  • Let building users know which areas are affected
  • Send your site hours and access windows
  • Send asbestos survey details if the building is pre-2000

Quotes

Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, speak to us on 01277 525 020 or send photos by email.

Get a price

Read more

Signs you need facade sealing in Thorney Island

New sealant run over old sealant rarely holds. Fresh silicone won’t stick to cured silicone, so the new bead peels away within a season or two.

Things that typically lead to an enquiry:

  • Cladding panel joints that have opened up
  • Patch repairs that keep failing
  • Damp patches beside frames after rain
  • Failed seals around shopfront and entrance frames

Hospital estates such as Havant War Memorial Hospital (3.2 miles north-west of Thorney Island) tend to grow and change in phases, often next to occupied wards, so facade and perimeter sealing has to fit the estates team’s plan.

What your quote should include

  • Will failed sealant be removed rather than covered?
  • Which product they’ll use, and why it suits the joint
  • Is depth set with backing rod, or bond-breaker tape in shallow joints?
  • How the joint faces will be prepared and primed

Our contractor checklist

Different surfaces, different methods

Render and coated surfaces

Where the joint will be painted over, a paintable hybrid or PU sealant may suit. The choice depends on the specification and finish.

Cladding panel joints

Joints between cladding panels open and close with temperature. We use a product rated for the movement and suited to the panel surface.

Accreditations

Trusted. Accredited. Insured.