Hampshire · England
Nether Wallop External Mastic
External mastic in Nether Wallop from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant pulling away from one side of the joint
- Movement joints with cracked, split or missing sealant
- Failed sealant between panels on a façade
External mastic in Nether Wallop, done properly
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing and we use one wherever it does. We are often asked to deal with cracked joints where brick meets render or frames and movement joints with cracked, split or missing sealant, on joints between brick and frames, brickwork movement joints and concrete & block.
Around Nether Wallop, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
All our work comes with a one-year guarantee, wherever you are in Hampshire.
- Location
- Nether Wallop (SO20)
- Region
- Hampshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
The process
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a few hours to a few days, depending on the length of joint and the access. Somewhere like Nether Wallop needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, phone 0345 464 0079 or email us.
Advice
What affects the cost of external mastic
The price is agreed before any work begins. It’s based on:
- The type of sealant required
- Whether old sealant or filler has to be cut out
- The number and length of the joints
- Any working-time requirements on site
The cost depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
Helping us quote
What to tell us when you ask for a quote:
- Where the job is, and your postcode
- The rough size of the job
- Any access issues, like height or stairs
- Whether it’s a home or a business
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work.
What we’re called out for in Nether Wallop
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.
Common reasons people contact us are:
- Weeds or debris growing in open joints
- Joints where the bead has come unstuck
- Movement joints filled with mortar instead of sealant
- Cracked joints where brick meets render or frames
In the older streets around Church of St Andrew, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before you book anyone
- Which colour the sealant will be
- How long the guarantee is
- Whether they’re fully insured
- How hidden problems are handled
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Avoid pressure-washing directly into sealant joints
- Show decorators and builders where the movement joints are
- Keep movement joints as flexible joints, not mortar
- Leave the joints unpainted unless we have said otherwise
Don’t paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants aren’t designed to be painted and spoil the finish.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Why act early in Nether Wallop
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. Where a wall is exposed, as many are in small places like Nether Wallop, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in Nether Wallop
- Anti-fungal sanitary silicone in wet areas
- One-year guarantee on every job
- Sealant colour chosen to suit
- Neat joints and a tidy finish
Outside joints around Nether Wallop
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 Wallop Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Letting a property close to Grateley station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Nether Wallop is about 7 miles south-west of Andover, in Hampshire. Every kind of property in Nether Wallop can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. 683 places in Hampshire are on our list. We also work in Southampton, around 16 miles away.
Every address in SO20 is covered for external mastic, from the main roads to the quietest streets. You will find streets such as Church Road, High Street and Church Hill. Other places close to Nether Wallop include Middle Wallop (1 mile north-west), Over Wallop (2 miles north-west), Kentsboro (2 miles north), Red Rice (4 miles north-east) and Fox (4 miles north). Larger places within reach include Winchester (12 miles south-east), Eastleigh (15 miles south-east), Andover (7 miles north-east), Totton (15 miles south), Chandler's Ford (13 miles south-east) and Romsey (10 miles south).
What’s near Nether Wallop
Around Nether Wallop, our work takes us to homes and buildings near The Old Butchers Arms and the streets around them. Nether Wallop’s nearest station is Grateley station, roughly 3.8 miles north-west of the centre. The countryside around Nether Wallop includes Boscombe Down East.
Landlord and commercial work in Nether Wallop
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Nether Wallop: your questions answered
Can you do external mastic in Nether Wallop?
Yes, Nether Wallop is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
Do you cover smaller places like Nether Wallop?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How do I get a quote for external mastic in Nether Wallop?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Can you reach joints on upper floors?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher work, tell us about the building and we’ll confirm what’s needed.
Do you work for landlords and businesses?
Yes, regularly. Several properties can be quoted together, and between tenancies is a good time for the work.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
When will the joints need doing again?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Our work comes with a one-year guarantee.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used before we leave.