Hampshire · England
Hartley Mauditt External Mastic
Our applicators work in Hartley Mauditt on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Gaps where render, brick and frames meet
- Joints where the bead has come unstuck
- Failed sealant between panels on a façade
External mastic in Hartley Mauditt, done properly
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it and we use one wherever it does. Typical jobs include joints where the bead has come unstuck and plants rooting in failed movement joints, across brickwork movement joints, render & cladding joints and copings & trims.
Older homes in small places like Hartley Mauditt may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
Our work is backed for twelve months.
- Location
- Hartley Mauditt (GU34)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for external mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- How much old sealant there is and how hard it is to remove
- When we can work, for business premises
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- Photos by email, if that’s easy
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
- Roughly how big the job is
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you are ready, ring 0345 464 0079 or email us.
Towns and villages near Hartley Mauditt
More services for Hartley Mauditt
When to call us in Hartley Mauditt
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
Look out for any of the following:
- Panel joints letting water in
- Weathered mastic that no longer stretches
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
Letting a property close to Alton station? Then split movement joints are easy to miss on a rental until damp shows inside.
Before booking anyone
- How the surfaces are prepared before sealing
- Whether you can choose the colour
- Who does the work, and how experienced they are
- What happens if they find a problem under the old sealant
What we cannot put right
New sealant can’t fix everything, and we’ll tell you before work begins. Sealant will not put right:
- Failed render or damaged cladding panels
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Subsidence or other structural problems
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Façade panels
FAQs for Hartley Mauditt
Do you cover smaller places like Hartley Mauditt?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you work for landlords with property near Alton station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces with primer where required.
Do you have insurance?
Yes. We are fully insured.
When is the sealant fully cured?
It depends on the product and the conditions. We tell you how long to leave it before we go.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. Then phone 0345 464 0079 or drop us an email.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Hartley Mauditt, along with the rest of our area.
Should I point up the gap in my brickwork?
No. A mortar-filled joint cannot move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
What we do, step by step
The work is kept neat and contained to the area we’re working on, so you can carry on as normal. The job normally takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. For a village or hamlet like Hartley Mauditt, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
Ask for a quote
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear price before we start.
Related advice
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render near the open joint, so the damage spreads beyond the joint. Around Hartley Mauditt, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, phone 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Why book with us
- You choose the colour before work begins
- An ARBOMaster approved applicator
- 20+ years of sealant experience
- Rated 4.9 stars on Google
See what affects the cost and our reviews.
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Outside joints around Hartley Mauditt
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St Leonard's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Hartley Mauditt is about 3 miles south-east of Alton, in Hampshire. Our applicators cover external mastic for homes and businesses in Hartley Mauditt, as part of our work across Hampshire. Hartley Mauditt is one of 683 places in Hampshire where we work for external mastic. There’s also a page for Portsmouth, about 22 miles away.
Postcode districts we cover here for external mastic: GU34. Nearby, we also carry out external mastic in East Worldham (1 mile north), Oakhanger (2 miles east), Upper Farringdon (2 miles west), Farringdon (2 miles west) and Chawton (2 miles north-west). We also work in nearby towns such as Basingstoke (12 miles north-west), Farnborough (14 miles north-east), Fleet (12 miles north-east), Horndean (15 miles south), Aldershot (12 miles north-east) and Alton (3 miles north-west).
Near you in Hartley Mauditt
Hartley Mauditt’s nearest station is Alton station, roughly 2.5 miles north-west of the centre. Other landmarks nearby include Alton Community Hospital (2.5 miles north-west) and The Romany Museum (1.6 miles south). The countryside around Hartley Mauditt includes Selborne Hill and Deadwater Valley.
How the job changes by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant.