Hampshire · England
External Mastic in Andwell
Sealing brickwork movement joints, render, cladding and façade joints in Andwell, with a 12-month guarantee on every job. Ask us for a quote.
- Plants rooting in failed movement joints
- Old sealant gone brittle and cracked
- Gaps where render, brick and frames meet
External mastic in Andwell, done properly
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 take the old material out and do it properly. If you have weathered mastic that no longer stretches and panel joints letting water in, we can help, on copings & trims, façade panels and concrete & block alike.
Around Andwell, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Andwell (RG25, RG27, RG24)
- Region
- Hampshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Walk round the building once a year and look at the joints
- Point out the joints to other trades
- Keep soil, plants and ivy away from the joints
- Have failed joints looked at early
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
How the visit works
Before we leave, we go over the finished joints with you. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on how much there is to do. Somewhere as small as Andwell, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, the joints are inspected and the access agreed.
- 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.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Mention if the joints have been sealed before
- Clear items away from the joints we are working on
- Keep pets and children clear of the area while we work
Get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved before giving you a price.
Advice
Andwell questions
Is Andwell in your area for external mastic?
Yes. We work across London and the South East, and Andwell is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
Can you help a landlord with a rental near Hook station?
Yes. We work for landlords and letting agents as well as homeowners. You can ring 0345 464 0079 or email us with the details for a clear quote.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
How do I get a quote for external mastic in Andwell?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Do the sealants smell?
Some sealants have a smell while they cure. Ventilation helps.
How long will you be here?
Most jobs take a few hours for a handful of joints, longer for a whole elevation. Your quote will say how long we expect yours to take.
Will the new joint stand out?
The sealant colour is picked to suit the wall so the joint blends in. Exterior sealants come in a good range of colours.
What affects the cost of external mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- How easy the joints are to reach
- The old material and how stubborn it is
- The number and length of the joints
- Whether there’s mould to deal with
Leaving a failed joint normally makes the job bigger, not smaller. If you’re not sure whether it needs doing, ring 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- A few photos by email, if you can
- How we’d reach the joints
- The rough size of the job
- If it’s domestic, commercial or a hotel
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
External mastic in Andwell: local notes
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. With historic houses such as The Vyne (about 4.2 miles north-west) nearby, there’s older building stock in the area around Andwell as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For an older house near a landmark such as St Swithun's church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Andwell is about 3 miles south-west of Hook, in Hampshire. Jobs in Andwell get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Andwell is one of 683 places in Hampshire where we work for external mastic. You can also see our page for Reading, roughly 13 miles from Andwell.
Every address in RG25, RG27 and RG24 is within our area for external mastic. We cover properties on Greywell Road and Canal Reach. Other places close to Andwell include Mapledurwell (1 mile south), Water End (1 mile north-east), Old Basing (1 mile west), Lychpit (2 miles west) and Wildmoor (2 miles north). Within a short drive, we also cover Basingstoke (4 miles west), Farnborough (11 miles east), Fleet (8 miles east), Aldershot (11 miles east), Alton (8 miles south) and Yateley (9 miles north-east).
Around Andwell
Andwell’s nearest station is Hook station, about 2.4 miles east of the centre. Nearby you will also find Festival Place (3.1 miles west) and Basingstoke and North Hampshire Hospital (4.2 miles west). Not far away are Dogmersfield Lake and The Mill Field.
DIY sealant or a professional job?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Places near Andwell
Also in Andwell
Common problems we fix in Andwell
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.
The problems people usually mention when they call are:
- Panel joints letting water in
- Movement joints with cracked, split or missing sealant
- Weathered mastic that no longer stretches
- Plants rooting in failed movement joints
Rented homes near Hook station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- Whether the sealant suits the joint
- What the quote includes, VAT included or not
- How hidden problems are handled
- How the joint is cleaned and prepared
What happens if it’s left?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Around Andwell, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email.
What you get with us
- Quality sealants from Arbo and Everbuild
- Sanitary silicone with an anti-fungal additive in wet areas
- We leave the area clean and tidy
- You choose the colour before work begins
Take a look at our cost guide and our reviews.
Surface by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.