Hampshire · England
Alderholt External Mastic
Specialist external mastic for Alderholt: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Leaking joints around cladding and façade panels
- Gaps where render, brick and frames meet
- Joints where the bead has come unstuck
About our external mastic in Alderholt
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. Typical jobs include leaking joints around cladding and façade panels and weathered mastic that no longer stretches, on render & cladding joints, copings & trims and façade panels.
Homes around Alderholt range from older cottages to newer houses, with walls and rooflines of every type. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Where
- Alderholt (SP6)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Signs you need external mastic in Alderholt
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
The most common problems we see are:
- Movement joints filled with mortar instead of sealant
- Leaking joints around cladding and façade panels
- Weathered mastic that no longer stretches
- Water getting into walls through failed joints
Homes close to Church of St James include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Before booking anyone
- What the quote includes, VAT included or not
- How the joint is cleaned and prepared
- Who turns up on the day
- Whether all the old sealant comes out first
Landlord and commercial work in Alderholt
For anyone letting property in or around Alderholt, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Aftercare tips
After the cure time, these simple habits help:
- Check the sealant is paintable before painting near it
- Keep water from gutters off the wall
- Check external joints each spring
- Don’t let climbing plants root in the sealant
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted and spoil the finish.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Towns and villages near Alderholt
More services for Alderholt
Alderholt buildings and the weather
With historic houses such as Breamore House (about 4.5 miles north-east) nearby, there’s older building stock in the area around Alderholt as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like St James' Church of England First School? Then larger buildings have long runs of movement joint that eventually need resealing.
Alderholt is in Hampshire. From the centre of Alderholt to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our area takes in 683 places across Hampshire. We also work in Southampton, about 19 miles from Alderholt.
Here we cover the SP6 postcode area for external mastic. Whether your property is on Station Road, Antell's Way and South Hill or anywhere close by, our applicators can take on the job. You will find Alderholt on the B3078, so it’s easy for us to get to. Nearby, we also carry out external mastic in Sandleheath (1 mile north), Ashford (2 miles north-east), Broxhill (2 miles west), Damerham (2 miles north-west) and Rockbourne (4 miles north). Larger places within reach include Totton (14 miles east), New Milton (13 miles south-east), Ringwood (5 miles south-east), Barton on Sea (14 miles south-east), Ashley (13 miles south-east) and St Leonards (6 miles south).
Around Alderholt
Typical jobs here are in homes near The Churchill Arms and The Burgate School and Sixth Form, among other places. A little further out are Godshill Castle Hill (3.6 miles north-east) and Fordingbridge Doll Museum (2 miles north-east). Open spaces near Alderholt include Blashford Lakes and Linbrook Lake.
What happens on the day
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a few hours to a few days, depending on the length of joint and the access, depending on how much there is to do. A visit to Alderholt is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- 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.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
- Move anything stored near the joints
Get a quote
We do not publish a price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or email us.
Related advice
Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost, so the problem grows beyond the joint itself. In a smaller place like Alderholt, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- A 12-month guarantee on all work
- Domestic, commercial and hotel work
- We leave the area clean and tidy
See our cost guide or what customers say.
Questions from Alderholt
Can you do external mastic in Alderholt?
Yes. Our work covers London and the South East, and Alderholt is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
Will you come out to Alderholt?
Yes, Alderholt is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
How long does the job take?
It depends on the size of the job, but most jobs take a few hours for a handful of joints, longer for a whole elevation. We will tell you when we quote.
Do you seal joints where cladding meets other materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces.
How much does external mastic cost in Alderholt?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or send us an email and let us know what needs doing and where.
Which products do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Where are you based?
Mr Mastic is based in Crawley. We cover Alderholt and the rest of Hampshire, along with the rest of our area.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
What the job involves on each surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
When something else is needed
We’ll always be straight with you, so here’s what sealant can’t fix:
- Cracking across the wall rather than at a joint
- Damp that isn’t coming from the joint
- Movement that’s more than a sealant joint can take
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
What we seal
- Render & cladding joints
- Joints between brick and frames
- Copings & trims
- Façade panels
- Brickwork movement joints
- Concrete & block