Hampshire · England
Kentsboro External Mastic
We cover Kentsboro for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Panel joints letting water in
- Sealant pulling away from one side of the joint
- Rain getting behind render or cladding at a joint
External mastic in Kentsboro
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. Common call-outs are for movement joints with cracked, split or missing sealant and weathered mastic that no longer stretches, on render & cladding joints, joints between brick and frames and façade panels.
In a village or hamlet like Kentsboro, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Where
- Kentsboro (SO20)
- Region
- Hampshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Kentsboro buildings and the weather
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Grateley station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Kentsboro is about 5 miles south-west of Andover, in Hampshire. We provide external mastic to homeowners, landlords and businesses in Kentsboro and nearby. Our area takes in 683 places across Hampshire. You can also see our page for Southampton, about 18 miles away.
Postcode districts we cover here for external mastic: SO20. You’ll find streets such as Mead Park Square, Upper Mead and Lower Mead. Neighbouring places we cover for external mastic include Over Wallop (2 miles south-west), Middle Wallop (2 miles south-west), Nether Wallop (2 miles south), Fox (2 miles north) and Red Rice (2 miles north-east). We also work in nearby towns such as Winchester (13 miles south-east), Andover (5 miles north-east), Chandler's Ford (14 miles south-east), Romsey (12 miles south), Hyde (12 miles south-east) and Tidworth (7 miles north-west).
What’s near Kentsboro
Kentsboro’s nearest station is Grateley station, about 2.6 miles west of the centre. Other landmarks nearby include Andover War Memorial Hospital (5 miles north-east). Not far away are Quarley Hill and Mill Lake.
How we quote for external mastic
The quote reflects the job in front of us. We look at:
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- How much there is to do
- Whether the work is at height
What it costs depends on the amount of work, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
What we need to know
Photos help, but a description is a good start. Please mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- Whether it’s a home or a business
- Roughly how big the job is
If you’re in Kentsboro and need external mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
How it works
We keep the work tidy and contained to the joints we are treating. The job generally takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Somewhere like Kentsboro needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Tell us about any water getting in
- Let us know about parking restrictions
Get a quote
Need a quote? Please ring 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Different surfaces, different methods
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and helps it last.
Signs you need external mastic in Kentsboro
Some movement joints have been pointed up with mortar. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Common reasons people contact us are:
- Old sealant gone brittle and cracked
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
- Leaking joints around cladding and façade panels
Around Kentsboro, as everywhere, external mastic is only as good as the preparation behind it.
Questions to ask before booking
- What guarantee comes with the work
- Whether you can choose the colour
- Are they insured?
- How long to leave it before use
Places near Kentsboro
More services for Kentsboro
Kentsboro questions
Is Kentsboro within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you work for landlords with property near Grateley station?
Yes. We work for landlords and agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area.
What does external mastic cost?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before work begins.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll explain our choice.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint.
Why act early in Kentsboro
Resealing a run of joints in one go is usually better than patching one at a time. Joints of the same age tend to fail together. Around Kentsboro, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why us?
- Experience in homes, commercial sites and hotels
- White, clear, grey or another colour, product permitting
- Every job guaranteed for a year
- Neat joints and a tidy finish
Can I do it myself?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
When it is not the sealant
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- Cracking across the wall rather than at a joint
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Joints between brick and frames