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

Facade Sealing in Roundshaw

Facade joint and window perimeter sealing on commercial buildings throughout Roundshaw and nearby, carried out by CSCS-carded applicators. CHAS accredited and fully insured.

  • Hard, chalky sealant that no longer flexes
  • Discoloured or dirty facade joints
  • Air leaks through failed facade joints
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
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
CHAS accredited
Fully insured: £5m PL

Facade sealing for Roundshaw sites

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

About our facade sealing in Roundshaw

We seal window and door perimeters, cladding panel joints, external facade joints and perimeter joints where frames meet the structure on offices, blocks and industrial units. Coping and flashing joints are included where sealant is the specified fix. Site teams most often ask us about new sealant peeling off old mastic and staining on stone next to old sealant, on window and door perimeters, perimeter joints where frames meet the structure and stone and brick facade joints. For commercial sealant work in Roundshaw, you deal with one contact from quote to sign-off, whether it’s one building or several.

The ULEZ covers the whole of Greater London, so contractors’ vehicles on a job in Roundshaw must meet its standards or pay the daily charge. Alongside that, sites normally need booked deliveries and a plan for where materials go.

Our workmanship is guaranteed for 12 months, in Roundshaw as everywhere else we work. If our installation lets you down in that time, we return and fix it.

The Mastic Doctor team beside their liveried vans in front of an office building
Location
Roundshaw (SM6, CR8, CR0)
Region
Greater London
Guarantee
A 12-month guarantee
Price
A fixed quote before we start
Telephone
01277 525 020
Last updated
3 November 2026

General trades versus a specialist

There’s also the paperwork. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we will confirm the paperwork you need with the quote.

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

Roundshaw: questions and answers

Can you work at a site such as Silver Wing Industrial Estate, by Roundshaw?

Yes. We cover Roundshaw and the area around it, including industrial estates, business parks and retail parks such as Silver Wing Industrial Estate. Photos and a short description are enough for a first look.

Can you take on a job at a hospital such as Purley War Memorial Hospital?

Yes, healthcare and care buildings are part of our work. Work is phased so departments keep running, under the site’s own rules.

Can you work on upper floors?

Access is planned with you before we quote. Tell us about access: existing scaffold, what you’re arranging and any site restrictions.

Do you take on small jobs?

Small jobs are welcome alongside larger packages. Send details for a fixed quote.

Who decides which product is used?

If the job is specified, we follow the specification. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.

How much does the work cost?

That depends on the job: quantities, access, the product and any phasing. Call for a fixed quote.

How long do sealant joints last?

It depends on movement, UV and weather, cleaning, traffic and the product. Treat them as maintenance items and inspect them regularly.

What the job involves on each surface

Precast concrete panels

Precast panel joints have to absorb thermal and structural movement. We use a sealant with the right movement capability, set over backing rod, primed where the maker specifies.

Window and door perimeters

Aluminium, PVC-U and timber frames each have their own preparation needs. We clean and prime to the sealant maker’s guidance for each surface.

When something else is needed

Part of a good diagnosis is knowing where sealant stops. We’ll tell you if the real problem is any of the following:

  • Leaks from roofs, gutters or failed flashings rather than sealant joints
  • Specialist high-level access methods
  • Work on the window or framing system itself

Not sure which it is? You can speak to us on 01277 525 020 or email the details over and we will tell you honestly before you book.

Joints and surfaces we work on

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

How a job runs

Before any cutting starts, the area is protected: tape along each joint edge and covers over finishes, stock and equipment close by. The work itself usually takes anything from a single day to several weeks, depending on joint lengths, access and the weather, and we clear our waste as we work. Planning a London job such as one in Roundshaw starts with access. Send the building rules and access times with your enquiry.

  1. Photos, drawings or a visit tell us about the joints and the access.
  2. Product choice follows the joint’s movement and substrate.
  3. Failed beads are removed in full and both faces cleaned back.
  4. Primer goes on where the product data asks for it.
  5. Rod goes in to fix the depth, then the joint is sealed and tooled.
  6. We go over the completed work with you before leaving.

Preparing the site

  • Tell us your opening times and when work is allowed
  • Point out parking and an unloading spot
  • Have the specification and drawings to hand

Quotes

To get a fixed quote, call the office on 01277 525 020 or use the quote form, telling us the site location and the nature of the job. Our quote form is another easy route.

Get a price

Read more

New build and refits around Roundshaw

A 2-mile radius around Roundshaw takes in a good number of hotels. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up. The ULEZ covers the whole of Greater London, Roundshaw included, so site vehicles need to meet its standards or pay the daily charge. Deliveries are booked and storage is tight, so mastic materials come in as needed.

When units on a site such as Silver Wing Industrial Estate, 0.5 miles north-east of Roundshaw, are refurbished or reclad, the panel joints and window perimeters are part of the mastic package. When a school such as Wallington Primary Academy is extended or refurbished, the mastic package is often squeezed into the holidays.

Roundshaw is about 2 miles south-west of Croydon, in Greater London. We cover commercial sites throughout Roundshaw, for single jobs and planned programmes alike. Across Greater London, 764 places are covered, including Roundshaw. London is covered too, some 10 miles away.

Postcode districts covered here: SM6, CR8 and CR0 for facade joints. Streets here include Link Lane, Milton Road and Redwing Road, and sites on any of them can send details for a fixed quote. Close to Roundshaw, our area also takes in Russell Hill (1 mile east), Bandonhill (1 mile north), Peaks Hill (1 mile south), Waddon (1 mile north-east) and Wallington (1 mile north-west). Bigger towns within reach include London (10 miles north), City of Westminster (11 miles north), Marylebone (11 miles north), Kensington (11 miles north), St Pancras (12 miles north) and Shoreditch (12 miles north).

Near you in Roundshaw

In Roundshaw, that means premises near Wilson's School, Waddon Ponds and The John Fisher School. For rail, the closest station is Wallington station, about 0.9 miles north-west. Well-known places in the area include Purley War Memorial Hospital (1.2 miles south-east) and Croydon Airport Visitor Centre (0.6 miles east). Green spaces nearby include Roundshaw Downs and Duppas Hill.

Map of Roundshaw © OpenStreetMap contributors

Work for main contractors and building owners

Hotels, schools, healthcare sites, offices and retail units book us directly too. The work is planned around how the building runs, so guests, pupils, patients or staff are disturbed as little as possible.

We take on planned maintenance as well as one-off repairs: resealing failed joints building by building, on a schedule that suits your budget. Roundshaw can form part of a wider programme across Greater London.

What we are called out for in Roundshaw

The wrong product causes its share of trouble: acetoxy-cure silicone may mark stone or corrode certain metals, and an interior product won’t last outdoors. Neutral-cure, facade-grade products are what most external joints need.

Common reasons buildings call us in:

  • Perimeter joints where frames meet the structure
  • Hard, chalky sealant that no longer flexes
  • Previous reseals run over old sealant
  • Leaks at window and door perimeters

Work at a hotel such as London Croydon Aerodrome Hotel (0.7 miles east of Roundshaw) tends to be programmed around bookings, mastic included.

Comparing quotes

  • Which product they’ll use, and why it suits the joint
  • Can the work be phased to keep areas open?
  • Health and safety accreditation such as CHAS
  • Proof of insurance

Questions to ask before you appoint anyone

Accreditations

Trusted. Accredited. Insured.