Hampshire · England
External Mastic in North Waltham
External mastic in North Waltham from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Water getting into walls through failed joints
- Leaking joints around cladding and façade panels
- Brick movement joints where the sealant has split
About our external mastic in North Waltham
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. Typical jobs include weathered mastic that no longer stretches and damp patches traced to an open external joint, across copings & trims, joints between brick and frames and brickwork movement joints.
In a village or hamlet like North Waltham, 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.
We stand behind the work with a 12-month guarantee.
- Location
- North Waltham (RG25)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
If you manage several properties in or around North Waltham, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
The process
When we arrive, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. The work usually takes anything from a few hours to several days, depending on the building. Somewhere like North Waltham 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.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- On commercial sites, let us know about site rules
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
Get a quote
For external mastic in North Waltham, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before any work starts.
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Can I do it myself?
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. Everything old must be removed first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Look over the joints every year, ideally after winter
- Ask before painting over external sealant
- Deal with leaking gutters that soak the joints below
- Keep high-pressure jets off the joints
Don’t paint over the new sealant unless we have said the product is paintable. Many exterior sealants aren’t designed to be painted and spoil the finish.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
What the job involves on each 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.
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Towns and villages near North Waltham
Other services in North Waltham
Outside joints around North Waltham
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of St. Michael's include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. For site and facilities teams at buildings such as North Waltham Primary School, its movement joints, gutters and trims need looking after like any other building’s.
North Waltham is about 5 miles south-west of Basingstoke, in Hampshire. Jobs in North Waltham get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our Hampshire coverage runs to 683 places, and North Waltham is one of them. Our Reading page covers work nearby (19 miles or so).
Postcode districts we cover here for external mastic: RG25. We cover properties on Church Road, Chapel Street and Cuckoo Close and the roads around them. We also cover Dummer (2 miles east), Oakley (3 miles north), Kempshott (3 miles north-east), Newfound (3 miles north) and Farleigh Wallop (4 miles east). Larger places within reach include Basingstoke (5 miles north-east), Winchester (12 miles south-west), Andover (12 miles west), Alton (10 miles south-east), Tadley (10 miles north) and Hook (11 miles north-east).
Local landmarks in North Waltham
Locally, jobs take us to homes and businesses close to The Fox pub. North Waltham’s nearest station is Micheldever station, about 3.6 miles south-west. Other landmarks nearby include Park Prewett Hospital (5.6 miles north-east). Green spaces nearby include Farleigh Hill.
FAQs for North Waltham
Will you come out to North Waltham?
Yes, North Waltham is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Is North Waltham in your area for external mastic?
Yes. Our work covers London and the South East, and North Waltham is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Are you fully insured?
Yes. We’re fully insured.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little.
When will the joints need doing again?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away.
Common problems we fix in North Waltham
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
Signs it’s time to call us include:
- Gaps where render, brick and frames meet
- Weeds or debris growing in open joints
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
Letting a property close to Micheldever station? Then split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- How long to leave it before use
- What happens if they find a problem under the old sealant
- Which sealant they’ll use, and why
- How much experience the applicator has
What affects the cost of external mastic
The price is agreed before any work begins. It’s based on:
- The number and length of the joints
- The number of rooms or windows
- Whether there’s mould to deal with
- The type of sealant required
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
You don’t need to know the technical terms. It helps if you can tell us:
- The rough size of the job
- How we’d reach the joints
- If someone has resealed it before
- What’s wrong with the joints now
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or email us.