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

Facade Sealing contractors in New Barn

Facade joint and window perimeter sealing on commercial buildings in New Barn and across Kent. CHAS accredited and fully insured, with a 12-month guarantee.

  • Failed seals around shopfront and entrance frames
  • Discoloured or dirty facade joints
  • Sealant pulling away from frames or panels
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
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
South East, London & Scotland
Constructionline member
£5m public liability

Facade sealing across New Barn

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

Facade sealing for commercial buildings in New Barn

A good facade joint depends on design as much as product. Joint width needs to match how far the joint moves and how far the sealant can stretch, while rod fixes the depth and stops the bead sticking to the rear with the ratio the sealant maker recommends, often around 2:1. We work on coping and flashing joints, window and door perimeters and stone and brick facade joints, and the usual reasons a site gets in touch are facade joints cracked through the middle and previous reseals run over old sealant. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, in New Barn it comes down to the same thing: the right product in a properly prepared joint.

In a smaller place such as New Barn, construction tends to mean small housing schemes, conversions and extensions to community buildings. Small schemes still need window perimeters, facade joints and internal sealant done to the specification.

The 12-month guarantee is for workmanship rather than wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we spell out the cover before we begin.

The Mastic Doctor team standing beside their branded vans outside an office building
Where
New Barn (DA3, DA13)
Region
Kent
Guarantee
A 12-month guarantee
Quotes
Quoted before any work starts
Phone
01277 525 020
Page updated
3 November 2026

From enquiry to sign-off

We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. Once we’re cleared to begin, we take the joints in the sequence agreed with you, and each area is checked before we leave it. What matters most for a job in New Barn is a clear list of what needs doing, so send photos of each area. A fixed quote follows.

  1. Photos, drawings or a visit tell us about the joints and the access.
  2. We confirm the joint type, movement and the specified product.
  3. The existing bead comes out 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. The finished joints are checked with you.

Before we start on site

  • Make sure the joints can be reached
  • Confirm the product named in the specification
  • Point out parking and an unloading spot

Request a quote

Let us know the site, the scope and your timescale, and a fixed quote will follow. The easiest way is to speak to us on 01277 525 020 or send photos by email.

Ask for a quote

Read more

Common questions from New Barn clients

Would you work within a site like Gravesham Community Hospital?

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

Is New Barn too far out for you?

No. Places such as New Barn are covered as much as the big towns. We work across Greater London and the South East. Where we can, we group nearby jobs to make the most of each trip.

Will you come and look before quoting?

It depends on the job. Straightforward work can often be priced from photos and measurements, and bigger or more complex jobs typically get a visit.

Can you fit around our working hours?

Give us your site hours and any access windows in your enquiry, and we will plan around them. Our office runs Monday to Friday, 8am until 5pm.

Can you work to our specification?

Yes. Include it with the drawings when you ask for a quote, and we will price the work to it, flagging anything that needs clarifying.

Do your applicators hold CSCS cards?

Yes. We use CSCS-carded applicators, which many sites require.

Do you seal on top of existing sealant?

No. We cut the old material out and clean the joint back before sealing, because fresh silicone will not bond with aged silicone.

Different surfaces, different methods

Cladding panel joints

Panel joints on cladding and rainscreen systems take movement every day. The sealant has to match the movement and the panel finish.

Perimeter joints at frames and structure

Perimeter joints at frames often show their age first. They are cut out, cleaned, backed and resealed using a sealant classified for that use.

What we can’t put right

We seal joints; we don’t mend everything behind them. Sealant alone won’t deal with:

  • Installing or repairing glazing systems
  • Damp caused by condensation inside the building
  • Arranging specialist high-level access, which is planned with the client

If you’re not sure, just call the office on 01277 525 020 or use the quote form and we’ll give you a straight answer before you book.

Where we work in New Barn

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

What happens if it’s left?

Resealing a few window perimeters is a small job; repairing water-damaged interiors and fixings is not. Leaks travel along the structure. A failed joint lets water into a building whatever its size. Early resealing avoids the damage that follows a leak.

Access can matter as much as the joints themselves: easy-to-reach joints are quicker than those that need equipment to get to. Mention the access as part of your enquiry.

Why us?

  • Our applicators hold CSCS cards
  • Specification-led, product-correct work
  • Fully insured, including public liability cover
  • Standard and matched colours in many product ranges

Read what affects the cost or our accreditations.

When to bring in a specialist

Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist brings efficiency, a consistent finish and a 12-month guarantee.

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. A poor seal in places like these tends to cost more to put right later.

Facades, frames and programmes in New Barn

The South East is one of the drier parts of the UK. That doesn’t stop wet spells, or frosty starts that leave panels too damp to seal, so external mastic is timed for workable conditions and agreed with the site manager. New Barn lies roughly 20 miles out from central London. Building activity in the commuter belt runs from new flats near stations to business park refurbishments, which keeps mastic packages in demand.

School extensions, at buildings such as Longfield Academy, normally run to the summer holidays, mastic included. For contractors on a campus like University of Greenwich (4 miles north-west of New Barn), facade and perimeter sealing has to fit around students and term dates.

New Barn is about 3 miles south of Northfleet, in Kent. Anywhere in DA3, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Our Kent coverage takes in 931 places, from busy centres to rural villages. London is covered too, some 20 miles away.

Anyone looking for facade sealing in DA3 and DA13 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. Streets here include The Maples, Kenwood Avenue and Merileys Close. Close to New Barn, our area also takes in Longfield Hill (1 mile south-east), Longfield (1 mile west), Hartley (1 mile south-west), Nash Street (1 mile east) and Meopham (2 miles south-east). Bigger towns within reach include Maidstone (12 miles south-east), Dartford (6 miles north-west), Sevenoaks (10 miles south-west), Gravesend (3 miles north-east), Tonbridge (14 miles south) and Northfleet (3 miles north).

What’s near New Barn

Around New Barn, our work takes us to commercial buildings near Istead Rise Primary School and Rectory Meadow and the streets around them. The nearest railway station is Longfield station, roughly 1.2 miles west. Well-known places in the area include Gravesham Museum (3.6 miles north-east) and Stone Castle (3.9 miles north-west). The countryside around New Barn includes Sawyers Lake.

Map of New Barn © OpenStreetMap contributors

Signs you need facade sealing in New Barn

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.

Site and facilities staff are often the first to spot these:

  • Water coming in around window frames
  • Cladding panel joints that have opened up
  • Perimeter joints where frames meet the structure
  • Air leaks through failed facade joints

With historic properties like Cobham College, 3.1 miles east of New Barn, in the area, refurbishment work often meets old masonry that needs compatible sealants.

Questions to ask before you book

  • How long is the guarantee, and what does it include?
  • Will CSCS-carded applicators be on site?
  • Which product they’ll use, and why it suits the joint
  • Whether primer will be used where the manufacturer specifies it

Choosing a commercial sealant contractor

Accreditations

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