West Berkshire · England
External Mastic in Great Shefford
External mastic across Great Shefford and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
- Weeds or debris growing in open joints
About our external mastic in Great Shefford
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. If you’re dealing with gaps where render, brick and frames meet and failed sealant between panels on a façade, we can put it right.
Around Great Shefford, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
A 12-month guarantee comes as standard, so you’re covered after we’ve gone.
- Place
- Great Shefford (RG17)
- Region
- West Berkshire
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Why act early in Great Shefford
Resealing a run of joints in one go is normally better than patching one at a time. They’ve weathered the same way, and access only has to be arranged once. Older cottages and farmhouses around Great Shefford can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- 20+ years of sealant experience
- A 12-month guarantee on all work
- Arbo and Everbuild products
- Colour picked to suit the job
See our cost guide and our reviews.
External mastic in Great Shefford: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Shefford C.E. Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Great Shefford is about 8 miles north-west of Newbury, in West Berkshire. If you need external mastic in Great Shefford, please call 0345 464 0079 or email us for a quick quote. We are based in Crawley and cover West Berkshire, Great Shefford included. Great Shefford is one of 155 places in West Berkshire we cover. Reading is on our list too, about 20 miles from Great Shefford.
We cover every part of RG17 for external mastic. You’ll find streets such as Station Road, The Mead and Miller's Field. We also cover East Shefford (1 mile south-east), Weston (1 mile south-east), East Garston (2 miles north-west), Shefford Woodlands (2 miles south-west) and East Garston Woodlands (2 miles west). Larger places within reach include Newbury (8 miles south-east), Thatcham (10 miles south-east), Speenhamland (7 miles south-east), Hungerford (5 miles south-west), Lambourn (4 miles north-west) and Shaw (7 miles south-east).
Near you in Great Shefford
The countryside around Great Shefford includes Sole Common Pond.
When to call us in Great Shefford
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Most people get in touch after spotting one of these:
- Water getting into walls through failed joints
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Joints with sealant missing in places
If you live in an older home near Church of St Mary, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What to look for in a quote
- How the joint is cleaned and prepared
- Who does the work, and how experienced they are
- Are they insured?
- Whether the sealant suits the joint
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Common questions in Great Shefford
Is there a guarantee on external mastic in Great Shefford?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you cover Great Shefford for external mastic?
Yes. We work across London and the South East, and Great Shefford is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear quote.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
I rent my home. Can I book you?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
Do you hold any approvals?
Yes. We are an ARBOMaster approved applicator.
Can a movement joint be filled with mortar?
No. Rigid materials can’t move with the wall, so the joint stops doing its job. If it has already been filled, we can normally cut it out and reseal it.
Where do you work from?
Our base is in Crawley, and we work across South East England, London and Scotland.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Landlords, agents and businesses in Great Shefford
Hotels need rooms back in use, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Walk round the building once a year and look at the joints
- Leave the joints unpainted unless we’ve said otherwise
- Have failed joints looked at early
- Keep high-pressure jets off 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.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.
The process
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to several days, depending on the building. In a small place like Great Shefford, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Clear items away from the joints we are working on
- Mention any sign-in or site rules at work premises
- Mention any tricky access
Getting a quote
We quote each job on its own. Just phone 0345 464 0079 or drop us an email with the details and send pictures if you have them.
Read more
Nearby places to Great Shefford
What else we do in Great Shefford
How we quote for external mastic
We do not publish a price list. What we look at:
- The product the joint needs
- Whether there’s mould to deal with
- Access and height
- How many areas need sealing
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- The type of property
- Pictures of the joints, sent by email
- Where the property is
- The rough size of the job
If you’re in Great Shefford and need external mastic, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before work begins.