Hampshire · England
External & façade joints in Whitchurch, Hampshire
External mastic across Whitchurch and nearby, with old sealant always removed completely and a 12-month guarantee.
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
- Cracked joints where brick meets render or frames
External mastic for homes and businesses in Whitchurch
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing. Typical jobs include joints pointed up with cement by mistake and sealant pulling away from one side of the joint, on façade panels, brickwork movement joints and concrete & block.
Around Whitchurch, garages, outbuildings and extensions all add to the joints on the outside of a home. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
You get a one-year guarantee, the same in Whitchurch as everywhere else we work.
- Place
- Whitchurch (RG28)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Whitchurch buildings and the weather
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Whitchurch (Hampshire) station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Church of All Hallows include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Whitchurch is about 6 miles east of Andover, in Hampshire. From the centre of Whitchurch to the outskirts, we cover external mastic for every kind of property. Whitchurch is one of 683 places in Hampshire where we work. You can also see our page for Southampton, about 22 miles away.
We cover every part of RG28 for external mastic and the streets around it. Whether your property is on London Road, Station Road and London Street or anywhere close by, our applicators can take on the job. Whitchurch sits on or near the B3400. Nearby, we also carry out external mastic in Wells-in-the-Field (1 mile east), Freefolk (1 mile east), Cole Henley (2 miles north), Firgo (2 miles south) and Hurstbourne Priors (2 miles south-west). Within a short drive, we also cover Basingstoke (10 miles east), Winchester (12 miles south), Andover (6 miles west), Tadley (12 miles north-east), Hyde (11 miles south) and Popley (12 miles east).
What’s near Whitchurch
Typical jobs here are in homes near The Red House Public House and Testbourne Community School, among other places. Whitchurch’s nearest station is Whitchurch (Hampshire) station, about 0.5 miles north.
What the job involves on each surface
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant so the movement is taken up.
Whitchurch: your questions answered
Is Whitchurch within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Whitchurch (Hampshire) station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Whitchurch and the rest of Hampshire.
Is the work guaranteed?
Yes. Every job comes with our one-year guarantee.
What does external mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or send us an email and let us know what needs doing and where.
How long before the joint can be used?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides.
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Why act early in Whitchurch
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. Homes in smaller places like Whitchurch can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email for an honest opinion and a quote.
What you get with us
- Homes, businesses and hotels
- You choose the colour before work begins
- 20+ years of sealant experience
- Colour picked to suit the job
Read what affects the cost or our reviews.
Nearby places to Whitchurch
What else we do in Whitchurch
The process
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes anything from a few hours to several days, depending on the building. A visit to Whitchurch is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any previous sealing or DIY attempts
- Clear items away from the joints we’re working on
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Advice
Signs you need external mastic in Whitchurch
If plants are growing out of a joint, the sealant has generally failed or was never there. Roots and dirt hold water against the wall and make things worse.
Look out for any of the following:
- Panel joints letting water in
- Movement joints filled with mortar instead of sealant
- Joints with sealant missing in places
- Old sealant gone brittle and cracked
Schools such as Whitchurch Church of England Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- Whether the sealant suits the joint
- Which colour the sealant will be
- Is the old sealant removed completely?
- What preparation is included
What sealant work cannot fix
We’d rather tell you now than do work that will not last, so these are the limits:
- Movement that is more than a sealant joint can take
- Cracks in the bricks or render themselves, away from the joints
- Walls that need new movement joints cut into them
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think.
Where we work in Whitchurch
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Façade panels
- Brickwork movement joints
- Render & cladding joints
Aftercare tips
After the cure time, these simple habits help:
- Deal with leaking gutters that soak the joints below
- Keep soil, plants and ivy away from the joints
- Keep movement joints as flexible joints, not mortar
- Keep high-pressure jets off the joints
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.