Expansion Joint Sealing in Welling
Expansion joint sealing in Welling, backed by over 20 years in commercial sealing. Fully insured, with a 12-month guarantee.
- Brittle, chalky sealant on external joints
- Damp inside where a wall movement joint has failed
- Joints where the bead has lost adhesion
Expansion joint sealing across Welling
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Expansion joint sealing in Welling, done properly
Joint design counts for as much as the sealant itself. The joint has to be wide enough for the expected movement and the sealant’s movement capability, and depth is controlled using closed-cell backing rod, or bond-breaker tape in shallow joints. For wider joints, many sealant makers recommend a width-to-depth ratio, often around 2:1, and the bead is tooled so it grips the two faces alone. Most enquiries involve spalled or broken joint edges in floors and decks and sealant peeling off one face of the joint, across blockwork control joints, car park decks and ramps and podiums and floor movement joints. For commercial sealant work in Welling, you deal with one contact from quote to sign-off, whether it’s one building or several.
London’s floor joints are concentrated in warehouses and trade units, car parks, podiums and decks. In Welling, as everywhere in London, access, loading and the ULEZ all come into the plan.
We sign every job off with a 12-month guarantee. The promise is simple: if our work fails within that year, we put it right.
- Place
- Welling (DA16, DA15, DA6)
- Region
- Greater London
- Guarantee
- 12 months on every job
- Price
- Quoted before any work starts
- Call
- 01277 525 020
- Updated
- 3 November 2026
Why it’s worth doing now in Welling
Closing a car park for a reseal is rarely an option. Work can be planned so parts of the deck stay open, compared with a full closure. We agree phasing with you before work starts. Getting scaffold, permits or access booked in Welling takes effort, so while access is arranged it pays to renew all failing joints, not just the worst.
Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Mention the access as part of your enquiry.
Why us?
- Public liability insurance in place
- Work carried out by CSCS-carded applicators
- Colours chosen to suit frames, cladding or finishes where possible
- Colours confirmed for the specified product
See our cost guide and how we’re accredited.
Places near Welling
Also in Welling
What we can’t put right
Part of a good diagnosis is knowing where sealant stops. You’ll hear from us if the cause turns out to be one of these:
- Broken or spalled joint edges, which need repairing before any sealant goes in
- Joints too narrow for the movement, which need redesigning by the engineer
- Movement on a scale no sealant is meant to absorb
If in doubt, call 01277 525 020 or email drawings and photos and we will say what we think.
What we seal
- Blockwork control joints
- Podiums and floor movement joints
- Cladding panel joints
- Precast concrete panel joints
- Car park decks and ramps
- Brickwork movement joints
After the work
Regular inspection catches problems early. Specifically:
- Clear dirt from joint lines during routine cleaning
- Include every elevation and deck joint in periodic inspections
- Act on the first tear or lifting edge rather than waiting
- Check joints after long freezing spells
Keep wheels, feet and water off new joints until the sealant has cured. How long that takes depends on the product, the temperature and the depth of the joint, and we confirm it for each area before we leave. Barriers left in place until then protect the finish.
An open joint fills with grit, and a joint full of grit can’t close. The edges then take the pressure and start to spall and the reseal becomes an edge repair as well. Keeping the seal sound avoids all of that.
Expansion joint sealing around Welling: what changes locally
Less than 3 miles from Welling there are at least three named estates and business parks. Floors, loading bays and yards on sites like these are where floor and movement joints work hardest. In London, decks, bays and service yards usually have to keep running, so we seal in sections and hand areas back as each cures.
Campuses like University of Greenwich Avery Hill Campus (1.6 miles south-west of Welling) mix old and new buildings, with movement joints wherever they meet. On a site such as Old Bexley Business Park, which lies south-east of Welling, the movement joints are in car park slabs, paving and building elevations. Centres like Broadway Shopping Centre, 1.6 miles east of Welling, have mall floors and service decks whose joints carry steady traffic.
Welling is about 9 miles east of London, in Greater London. Any commercial site in Welling is covered. Our Greater London coverage takes in 764 places, from busy centres to rural villages. We also cover London, around 9 miles from Welling.
Postcode districts covered here: DA16, DA15 and DA6 for movement joints. Buildings on Days Lane, Hook Lane and Lyme Road are within our area for movement joints. Main routes into Welling include the A207, which helps when planning parking and deliveries for the job. Sites close to Welling are covered too, including Crook Log (1 mile east), Blendon (1 mile south-east), Upton (1 mile east), Bexleyheath (1 mile east) and West Heath (1 mile north-east). Nearby towns on our patch include London (9 miles west), City of Westminster (12 miles west), Marylebone (12 miles west), Kensington (14 miles west), St Pancras (11 miles north-west) and Shoreditch (9 miles north-west).
Near you in Welling
Around Welling, our work takes us to commercial buildings near Nags Head pub, Danson Park and Bexley Grammar School and the streets around them. Welling’s nearest station is Welling station, roughly 0.5 miles north-west. Nearby you’ll also find Greenwich Castle (5 miles west) and Broadway Shopping Centre (1.6 miles east). Not far away are The Tarn and Summer Hill.
Site staff or a sealant specialist?
Certain joints really need a specialist: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. A poor seal in places like these tends to cost more to put right later.
Paperwork matters too. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we’ll confirm the paperwork you need with the quote.
Common questions from Welling clients
Is hospital work, at somewhere like Memorial Hospital, something you do?
Yes. Healthcare sites are among the places we work. Work is phased so departments keep running, under the site’s own rules.
Do you work in London buildings with loading restrictions?
Yes. Inductions, permits and timed loading are routine for us in London. Send the building rules and access times with your enquiry. All of Greater London is inside the ULEZ, and our planning allows for it
Does weather matter for sealant work?
It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so we watch the forecast and rearrange outside work if we have to. Internal work is far less affected.
How do I request a quote?
It works in four steps: send details, get a quote, we seal, guaranteed. The first step only needs photos and a postcode.
Can you work while the building is occupied?
In most cases, yes. We phase the work so most of the building stays in use.
Are you fully insured?
Yes. Mastic Doctor is fully insured, public liability included.
Are you CHAS accredited?
Yes. We’re CHAS accredited and a Constructionline member, which helps with supplier vetting.
From enquiry to sign-off
The first thing on site is a walk round with your contact, to confirm the scope, the order of work and any areas we must keep clear. Then we strip out anything that has failed, prepare every joint and seal it. All of Greater London is in the ULEZ, and kerbside space in Welling can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- Photos, joint lengths and drawings come to us, or we visit.
- We compare each joint’s width with the movement and the sealant’s capability.
- Old sealant and debris are cut out of every joint.
- Any broken arrises or friable edges are flagged before work goes further.
- The right sealant goes in at the right depth, bonded to the two sides only.
- Areas reopen once cured, and the work carries our 12-month guarantee.
Getting the site ready
- Confirm the product named in the specification
- Flag any permit to work we’ll need
- Share your working hours and any access restrictions
Getting a fixed quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price the work to it. Smaller jobs need nothing more than photos and a few notes.
Read more
What affects the price in Welling
These are the things that shape the price:
- Whether old sealant has to be cut out first
- Which sealant the job calls for
- Any access equipment needed
- Working within restricted access windows
Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. A fixed quote follows once we understand the job.
Details that help us quote
However big the job, these details speed things up:
- Drawings or a marked-up plan, if available
- A wide shot and a close-up of the area
- How the joints are reached, and at what height
- Your programme or deadline
A good quote starts with a clear picture: the joints involved, quantities, access and the product called for. Share whatever details you have and we will fill any gaps with a visit.