Hampshire · England
External Mastic in Wherwell
External mastic in Wherwell from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Failed seals between different materials
- Panel joints letting water in
Landlords, agents and businesses in Wherwell
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Housing providers, facilities teams and property managers book us too in Wherwell and across Hampshire. Several sites can go on one quote, and we’re fully insured.
External mastic in Wherwell
On houses, flats and commercial buildings across Wherwell, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you are dealing with joints with sealant missing in places and rigid filler in a joint that should flex, we can help, on concrete & block, copings & trims and joints between brick and frames alike.
Outside joints can only be sealed when they’re dry, so work in Wherwell is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Where
- Wherwell (SP11)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Outside joints around Wherwell
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.
For landlords with property near Andover station, split movement joints are easy to miss on a rental until damp shows inside. Homes close to Church of St Peter and Holy Cross include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Wherwell is about 3 miles south-east of Andover, in Hampshire. We provide external mastic to homes and businesses in Wherwell and nearby. 683 places in Hampshire are on our list. We also work in Southampton, around 17 miles away.
We work across SP11 for external mastic and the streets around it. That includes homes and businesses on High Street, Fair Piece and Beech Grove. We also cover the places around Wherwell: Wherwell Wood (1 mile north-west), Cottonworth (1 mile south-west), Chilbolton (1 mile south), Fullerton (1 mile south-west) and South Harewood (1 mile north-east). We also work in nearby towns such as Winchester (9 miles south-east), Eastleigh (14 miles south), Andover (3 miles north-west), Chandler's Ford (13 miles south), Romsey (12 miles south) and Hyde (9 miles south-east).
Landmarks near Wherwell
Around Wherwell, our work takes us to homes and buildings near White Lion Public House and Longstock Park. For rail, the closest station is Andover station, about 3.7 miles north-west of the centre. Well-known places in the area include Andover Museum (3.3 miles north-west) and Andover War Memorial Hospital (4 miles north-west). For a walk, there’s Mill Lake and Anton Lakes.
When to call us in Wherwell
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
Common reasons people contact us are:
- Rain getting behind render or cladding at a joint
- Failed seals between different materials
- Sealant pulling away from one side of the joint
- Old sealant gone brittle and cracked
If you look after a building such as Wherwell Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- How hidden problems are handled
- What the cure time is
- Whether they’re fully insured
- What preparation is included
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Never let anyone fill a movement joint with mortar
- Clear growth from the base of walls and joints
- Show decorators and builders where the movement joints are
- Wash walls gently around the sealant
Keep pressure washers away from the sealant. High-pressure water can lift the edges.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.
Towns and villages near Wherwell
What else we do in Wherwell
How the job changes by surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Why act early in Wherwell
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Around Wherwell, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Why us?
- Anti-fungal silicone where joints get wet
- 180+ five-star Google reviews
- Any old sealant cut out fully, not covered over
- We agree the colour with you first
Read our cost guide or our reviews.
Your questions about external mastic in Wherwell
Can you do external mastic in Wherwell?
Yes, Wherwell is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Will you come out to Wherwell?
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.
What information do you need?
A short description and the location. If we need more, we’ll ask.
Can a movement joint be filled with mortar?
No. Cement or mortar can’t stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we’re using.
How long will you be here?
Typically it takes anything from a few hours to several days, depending on the building. Larger jobs naturally take longer, and we’ll say how long yours will take.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render so the joint blends in. Exterior sealants come in a good range of colours.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
What we do, step by step
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Wherwell, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- 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.
How to prepare
- Mention any tricky access
- Let us know about earlier repairs to the joints
- Clear items away from the joints we’re working on
How to get a quote
For a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.