Kent · England
External Mastic in Betsham
Specialist external mastic for Betsham: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
- Damp patches traced to an open external joint
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll quote.
Landlords and agents in Betsham can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
How we handle external mastic in Betsham
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing and we use one wherever it does. We work on façade panels, copings & trims and joints between brick and frames, and people most often call us about moss and dirt in joints with no sealant left and sealant that has lost its bond to the brick or render.
In a village or hamlet like Betsham, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
Every job comes with our one-year guarantee.
- Location
- Betsham (DA13)
- Region
- Kent
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Betsham
Also in Betsham
Walls and rooflines in Betsham
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Cobham College (about 4.4 miles south-east) are a reminder that the area around Betsham has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For site and facilities teams at buildings such as Sedley's Church of England Voluntary Aided Primary School, larger buildings have long runs of movement joint that eventually need resealing. Letting a property close to Longfield station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Betsham is about 2 miles south-west of Northfleet, in Kent. Every kind of property in Betsham is covered for external mastic. Every job comes with our one-year guarantee. Betsham is one of 922 places in Kent we cover for external mastic. You can also see our page for London, roughly 18 miles from Betsham.
We cover every part of the DA13 postcode area for external mastic. If you need external mastic at a property on Station Road, Crayburne and Park Corner Road or a nearby road, we can help. Betsham is on the B262, so it’s easy for us to get to with everything needed for external mastic. If you’re just outside Betsham, we cover Hook Green (1 mile south-east), Southfleet (1 mile south-east), Springhead (1 mile north-east), Ebbsfleet Valley (1 mile north) and Northfleet Green (1 mile east). We also work in nearby towns such as Maidstone (14 miles south-east), Dartford (4 miles north-west), Sevenoaks (11 miles south-west), Gravesend (3 miles east), Tonbridge (15 miles south) and Swanley (6 miles west).
Near you in Betsham
In Betsham, that means homes and buildings near Beacon Wood Country Park, The Ebbsfleet Academy and The Ship Inn, among other places. Betsham’s nearest station is Longfield station, about 1.7 miles south of the centre. Other landmarks nearby include Darent Valley Hospital (2.4 miles north-west) and Stone Castle (2.1 miles north-west). Not far away are Chafford Gorges Nature Park and Sawyers Lake.
Betsham: your questions answered
Can you help a landlord with a rental near Longfield station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Is Betsham in your area for external mastic?
Yes, Betsham is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll send you a clear quote.
Can you do several jobs on one visit?
Of course. Doing several areas at once is normally more efficient, so mention them when you ask for a quote.
Will the old sealant be removed?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Do you guarantee your work?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used.
Why do you put foam in the joint first?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint can’t move, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- The number of rooms or windows
- Any working-time requirements on site
- The type of sealant required
- Whether there’s mould to deal with
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Any access issues, like height or stairs
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- What the problem is, such as mould, gaps, leaks or cracking
Need a quote? Please ring 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Aftercare tips
Aftercare is simple:
- Avoid pressure-washing directly into sealant joints
- Clear growth from the base of walls and joints
- Ask before painting over external sealant
- Show decorators and builders where the movement joints are
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
How the job changes by surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it so the sealant is not too deep.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so its sealant has to stay flexible.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
What we’re called out for in Betsham
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint.
Common reasons people contact us include:
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
- Old sealant gone brittle and cracked
- Gaps where render, brick and frames meet
If you live in an older home near Church of St Nicholas, an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- What preparation is included
- What guarantee comes with the work
- Which sealant they’ll use, and why
- What the cure time is
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as Betsham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Mention any tricky access
- Mention any parking rules near the property
- For business premises, tell us about site rules or sign-in
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.