Hampshire · England
External Mastic in Broxhill
External mastic in Broxhill from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Movement joints with cracked, split or missing sealant
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
How we handle external mastic in Broxhill
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we will confirm what access is needed. We are often asked to deal with panel joints letting water in and plants rooting in failed movement joints, across façade panels, brickwork movement joints and render & cladding joints.
Outside joints can only be sealed when they’re dry, so work in Broxhill is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Broxhill (SP6, BH21)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
A little care helps the new joints last. Our advice:
- Keep water from gutters off the wall
- Act on the first splits you see
- Leave the joints unpainted unless we have said otherwise
- Keep high-pressure jets off the joints
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
Nearby places to Broxhill
More services for Broxhill
How the visit works
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Broxhill, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Tell us about any water getting in
- Clear items away from the joints we’re working on
- Mention if the joints have been sealed before
Get a quote
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or drop us an email with the details and send pictures if you have them.
Read more
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way, and access only has to be arranged once. Older cottages and farmhouses around Broxhill can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Broxhill
- Sanitary silicone with an anti-fungal additive in wet areas
- Fully insured
- 180+ five-star Google reviews
- Any old sealant cut out fully, not covered over
Take a look at how sealant jobs are priced or our reviews.
FAQs for Broxhill
Can you do external mastic in Broxhill?
Yes, Broxhill is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Is external mastic in Broxhill guaranteed?
All our work, in Broxhill and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
When is the sealant fully cured?
It depends on the product. We tell you how long to leave it before we go.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do you work for letting agents?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Broxhill buildings and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In and around Broxhill, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Broxhill is in Hampshire. Anywhere in SP6, our applicators can take on external mastic. Broxhill is one of 683 towns and villages in Hampshire where we work for external mastic. Our Southampton page covers work nearby, about 21 miles away.
Our applicators cover all of SP6 and BH21 for external mastic. Neighbouring places we cover for external mastic include Alderholt (2 miles east), Damerham (2 miles north), Sandleheath (2 miles north-east), Ashford (3 miles east) and Rockbourne (4 miles north). We also work in nearby towns such as New Milton (14 miles south-east), Ringwood (6 miles south-east), Barton on Sea (15 miles south-east), Ashley (14 miles south-east), Fordingbridge (3 miles east) and St Leonards (6 miles south).
Local landmarks in Broxhill
Well-known places in the area include Cranborne Castle Hill (2.1 miles west) and Fordingbridge Museum (3.6 miles east). The countryside around Broxhill includes Blashford Lakes.
Common problems we fix in Broxhill
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Keep an eye out for these signs:
- Movement joints filled with mortar instead of sealant
- Joints where the bead has come unstuck
- Failed seals between different materials
- Movement joints with cracked, split or missing sealant
In the older streets around Church of St James, an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- How long the guarantee is
- What the cure time is
- Whether they’re fully insured
- What happens if the job turns out different
Different surfaces, different methods
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. The sealant is chosen with that in mind.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Any mould that needs treating
The cost depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins.
Helping us quote
When you call or email, these details help:
- What’s wrong with the joints now
- Any previous sealing or DIY work
- The address or postcode of the job
- Any access issues, like height or stairs
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.