Hampshire · England
Dumpford External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Dumpford, backed by a 12-month guarantee. Ask us for a quote.
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
External mastic in Dumpford, done properly
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. We work on façade panels, concrete & block and joints between brick and frames, and people most often call us about joints pointed up with cement by mistake and leaking joints around cladding and façade panels.
In a village or hamlet like Dumpford, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- Dumpford (GU31)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for external mastic
We do not publish a price list. The quote depends on:
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- Mould in or behind the old joints
- How many areas need sealing
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
What we need to know
To help us quote quickly, please include:
- Whether it’s a home or a business
- Any previous sealing or DIY work
- The address or postcode of the job
- Photos by email, if that’s easy
Every job is quoted individually, so the first step is telling us about yours. Simply call 0345 464 0079 or send us an email and describe the job and send pictures if you have them.
Towns and villages near Dumpford
Other services in Dumpford
Why act early in Dumpford
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last, so it pays to do it properly once. In a small place like Dumpford, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email.
Why choose Mr Mastic in Dumpford
- Colour picked to suit the job
- Rated 4.9 stars on Google
- Sanitary silicone with an anti-fungal additive in wet areas
- An ARBOMaster approved applicator
See our cost guide or what customers say.
Landlord and commercial work in Dumpford
Letting agents often deal with us directly. Tell us the address, the job and how access works.
We also work for property managers and facilities teams in Dumpford and across Hampshire. Several sites can be quoted together, and we’re fully insured for the work.
Looking after it afterwards
So the new joints stay in good condition:
- Check the sealant is paintable before painting near it
- Keep movement joints as flexible joints, not mortar
- Keep water from gutters off the wall
- Keep soil, plants and ivy away from the joints
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
The process
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. Expect the work to take a few hours for a handful of joints, longer for a whole elevation. Somewhere like Dumpford needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We look at every joint and agree a colour to suit the wall.
- 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.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Mention any tricky access
- Mention any sign-in or site rules at work premises
- Mention if the joints have been sealed before
Ask for a quote
If you are in Dumpford and need external mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Read more
What we are called out for in Dumpford
If plants are growing out of a joint, the sealant has normally failed or was never there. Roots and dirt hold water against the wall and make things worse.
If you can see any of these, it’s time to have the joints looked at:
- Sealant pulling away from one side of the joint
- Hard, crazed mastic that has stopped moving
- Leaking joints around cladding and façade panels
- Water getting into walls through failed joints
If you let a flat or house near Liss station, split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- Is the old sealant removed completely?
- Whether the sealant suits the joint
- Who turns up on the day
- How long the guarantee is
Dumpford questions
Do you work for landlords with property near Liss station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or email us with the details for a clear quote.
Can you do external mastic in Dumpford?
Yes, Dumpford is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Do you work at height?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin from the range available.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides with primer where required.
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracks in the bricks or render themselves, away from the joints
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before you book.
Joints and surfaces we work on
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Façade panels
- Render & cladding joints
- Joints between brick and frames
Walls and rooflines in Dumpford
With historic houses such as Cowdray House (about 3.8 miles east) nearby, there’s older building stock in the area around Dumpford as well as newer homes. Where a home is older, 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.
For an older house near a landmark such as St George's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Dumpford is about 5 miles east of Petersfield, in Hampshire. Anywhere in GU31, we cover external mastic for homes and businesses. Our Hampshire coverage runs to 683 places, and Dumpford is one of them. For nearby work, see our Portsmouth page (17 miles or so).
Work in GU31 is quoted and booked the same way as anywhere else. That includes homes and businesses on Terwick Lane, Mill Lane and Trotton Road. If you are just outside Dumpford, we cover Trotton (1 mile north-east), Elsted Marsh (1 mile south), Ingrams Green (1 mile south-east), Elsted (2 miles south-west) and Nyewood (2 miles west). Within a short drive, we also cover Havant (11 miles south-west), Horndean (10 miles south-west), Alton (13 miles north-west), Waterlooville (12 miles south-west), Petersfield (5 miles west) and Purbrook (13 miles south-west).
Local landmarks in Dumpford
Around Dumpford, our work takes us to homes and buildings near The Keeper's Arms Public House, among other places. For rail, the closest station is Liss station, roughly 4.9 miles north-west. Well-known places in the area include Midhurst Museum (3.5 miles east) and Midhurst Community Hospital (3.6 miles east). Not far away are Iping and Stedham Commons and Wheeler's Down.