Mastic Sealing in Longfield
Mastic sealing in Longfield, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.
- Window mastic that has split and shrunk
- The same joint failures repeated across a portfolio
- Damaged joints in communal entrances and corridors
Mastic sealing near Longfield
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
What we are called out for in Longfield
We often find joints filled solid with no backing rod, so the mastic is glued to the joint bottom too. It can’t stretch properly and splits as the building moves.
Most enquiries start with one or more of the following:
- Open joints in brickwork or panels
- Mastic failing across several blocks on an estate
- Brittle perimeter mastic across a building
- Worn sealant at communal door frames
If you’re responsible for a building such as Church of Saint Mary Magdalene, frame and door mastic needs the same attention as any other property.
Questions to ask before you book
- What level of public liability insurance do they hold?
- How they handle RAMS and site documents
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
- How the existing material will be dealt with
Mastic sealing in Longfield, done properly
For over 20 years we have resealed joints for owners, agents and landlords. Our applicators are CSCS-carded, and the work is backed by public liability insurance. Resealed mastic joints in Longfield carry our 12-month guarantee. We work on shopfronts below residential blocks, communal entrances and stairwells and window and door perimeters on blocks, and the usual reasons a site gets in touch are estate-wide sealant that is simply worn out and draught complaints from residents or tenants. Most enquiries from Longfield start with one failed joint and grow into a wider look at the building: we look at the rest while we are there and tell you what we find.
Owners and agents with buildings around smaller places such as Longfield tend to manage small terraces of association properties, converted barns and commercial units. Mastic around frames and on external joints wears out in time, whatever the building.
A 12-month guarantee applies to all our work in Kent. If an installation problem shows up, ring 01277 525 020 or email a schedule or drawings and we’ll arrange a return visit.
- Where
- Longfield (DA3)
- Wider area
- Kent
- Guarantee
- 12 months on our workmanship
- Price
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Updated
- 3 November 2026
Surface by surface
Estate-wide resealing programmes
A programme can start with the worst buildings and work down. You get one fixed quote per building or for the whole estate.
Planned maintenance
Adding mastic to planned maintenance avoids reactive repairs and keeps budgets predictable.
Common questions from Longfield clients
Will you take on work at estates like Fawkham Business Park, close to Longfield?
Yes. We cover Longfield and the area around it, including industrial estates, business parks and retail parks such as Fawkham Business Park. To start, just call the office on 01277 525 020 or send photos by email with the unit, the joints involved and your access times.
Will you take on a block within reach of Longfield station?
Yes, and several blocks can go on one quote. We work to your notice and access arrangements.
When is resealing likely to be due?
It depends on movement, UV and weather, cleaning, traffic and the product. Sealant joints are maintenance items, so inspect them regularly.
Do you work to architects’ specifications?
Yes. Send it with your enquiry, and we will price the work to it.
What if the old mastic contains asbestos?
Some mastics in pre-2000 buildings contain asbestos. We ask for the asbestos register or survey before work starts and suspect material is tested first.
Can you seal joints high up on a block?
It depends on the building. How upper joints are reached is agreed before work is booked so there are no surprises.
How long does a typical visit take?
It depends on the scope, though a typical visit normally takes one or more days per building, depending on the joint lengths and the access. For bigger or phased jobs, we will set out a timescale with the quote.
When it isn’t the sealant
A few problems need another trade or a different fix, and we say so rather than covering them up:
- Glazing that needs replacing
- Leaks from above rather than through a joint
- Substrate edges that need repairing first
Not sure which it is? You can call the office on 01277 525 020 or email the details over and we will tell you honestly.
Where we work in Longfield
- Shopfronts below residential blocks
- External wall and movement joints
- Communal entrances and stairwells
- Communal kitchens and washrooms
- Balcony and threshold joints
- Window and door perimeters on blocks
Towns and villages near Longfield
Other services in Longfield
From enquiry to sign-off
We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. With the paperwork done, we take the joints in the sequence agreed with you, and each area is checked before we leave it. If others near Longfield need work, visits can be combined. You will have a fixed quote before work starts.
- First comes a look at the joints and, for older buildings, the asbestos records.
- A fixed quote covers the joints, products and order of work.
- Failed mastic is removed completely.
- The joints are prepared and resealed with the right product.
- We finish each building before moving to the next.
Getting the site ready
- Tell us your opening times and when work is allowed
- Send any specification or drawings in advance
- Agree which areas must stay open
Getting a fixed quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price the work to it. For smaller jobs, photos and a description will do.
Read more
Aftercare for building managers
A few simple habits keep the new joints working:
- Ask residents or tenants to report leaks and draughts early
- Track which buildings were done and when
- Group repairs into a planned programme
- Include mastic in your cyclical inspections
Log the date and extent of the resealing for each block. That makes future programmes easier to plan and gives you a history.
Mastic fails gradually, then all at once in a wet spell. Resealing when cracking first shows avoids water damage and the complaints that come with it.
Mastic sealing in Longfield: the local picture
Rainfall across the South East, Longfield included, is lower than in many parts of the UK. Outside mastic still needs a dry joint and the right temperature, and south- and west-facing elevations, which take the most sun and rain, often age first. Central London is about 19 miles from Longfield. Around the capital’s commuter belt, managing agents look after many blocks close to stations and town centres.
Landlords with units on estates such as Fawkham Business Park, 0.5 miles to the west of Longfield, can bring frame, door and external mastic across several units into one programme. For a school such as Longfield Academy, perimeter mastic on windows and doors is a holiday job.
Longfield is about 3 miles south-west of Northfleet, in Kent. Our applicators travel to Longfield for work on mastic joints. Across Kent, 931 places are covered, Longfield among them. London is covered too, some 19 miles away.
Work on mastic joints is covered throughout DA3. We cover commercial and managed buildings on Station Road, Main Road and Ightham Close and the roads nearby. We also cover Hartley (1 mile south), New Barn (1 mile east), Longfield Hill (1 mile south-east), New Ash Green (2 miles south) and Nash Street (2 miles east) for mastic joints. Nearby towns on our patch include Maidstone (13 miles south-east), Dartford (5 miles north-west), Sevenoaks (10 miles south-west), Gravesend (4 miles north-east), Tonbridge (14 miles south) and Northfleet (3 miles north-east).
What’s near Longfield
In Longfield, that means premises near Railway Tavern, Hartley Primary Academy and Rectory Meadow and the streets around them. Longfield has its own railway station: Longfield station. Nearby you will also find Darent Valley Hospital (3.3 miles north-west) and Stone Castle (3.4 miles north). For a walk, there’s Sawyers Lake.
General trades versus 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.
For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint, which is what makes a joint last.