Hampshire · England
Kempshott External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Kempshott, with a one-year guarantee on every job. Ask us for a quote.
- Joints with sealant missing in places
- Joints pointed up with cement by mistake
- Sealant pulling away from one side of the joint
External mastic for homes and businesses in Kempshott
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. We work on concrete & block, façade panels and render & cladding joints, and the jobs we see most are sealant pulling away from one side of the joint and brick movement joints where the sealant has split.
Houses in smaller places like Kempshott can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are normally the first to go.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Kempshott (RG22, RG23)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
What the job involves on each surface
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it or an approved alternative. Send us any details you have about the façade.
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
What affects the cost of external mastic
Jobs vary more than people expect. What affects the quote:
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- Access and height
- Any working-time requirements on site
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or send us an email and we will give you an honest view and a quote.
What we need to know
To make quoting easier, let us know:
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
- If someone has resealed it before
For external mastic in Kempshott, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
External mastic in Kempshott: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like The Vyne (about 4.9 miles north-east) are a reminder that the area around Kempshott has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For an older house near a landmark such as Saint Mark's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Basingstoke station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Kempshott is about 2 miles south-west of Basingstoke, in Hampshire. Homes, rented property, offices and hotels in Kempshott can book us for external mastic, old or new, large or small. The work is guaranteed for a year. Across Hampshire, we cover 683 places, Kempshott among them. Reading is on our list too, around 16 miles away.
Work in RG22 and RG23 is quoted and booked the same way as anywhere else. Streets in the area include Roman Road, Aster Road and Osprey Road, all of which we cover. Nearby, we also carry out external mastic in Buckskin (1 mile north), Hatch Warren (1 mile south-east), Worting (1 mile north), Brighton Hill (1 mile east) and South Ham (2 miles north-east). Further out, we also cover Winchester (15 miles south-west), Fleet (13 miles east), Andover (15 miles west), Alton (10 miles south-east), Yateley (15 miles north-east) and Tadley (8 miles north).
What’s near Kempshott
In Kempshott, that means homes and buildings near Brighton Hill Community School and Coppice Spring School, among other places. Kempshott’s nearest station is Basingstoke station, about 2.8 miles north-east of the centre. Other landmarks nearby include Willis Museum (2.6 miles north-east) and The Malls (2.8 miles north-east). Green spaces nearby include Daneshill Park Woods and Farleigh Hill.
Signs you need external mastic in Kempshott
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Keep an eye out for any of the following:
- Cracked joints where brick meets render or frames
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
- Plants rooting in failed movement joints
For site and facilities teams at buildings such as Kempshott Junior School, larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- Which sealant they’ll use, and why
- What happens if the job turns out different
- What preparation is included
- Whether they’re fully insured
Kempshott: your questions answered
Will you come out to Kempshott?
Yes, Kempshott is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Basingstoke station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Can you seal over the old sealant?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or drop us an email.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Looking after it afterwards
After the cure time, these simple habits help:
- Wash walls gently around the sealant
- Check the sealant is paintable before painting near it
- Never let anyone fill a movement joint with mortar
- Walk round the building once a year and look at the joints
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
The process
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours to a few days, depending on the length of joint and the access. Parking around Kempshott is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Tell us about any water getting in
- Let us know about stairs, lifts or work at height
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved and give you a clear price.