West Berkshire · England
External Mastic in Thatcham
External mastic across Thatcham and nearby, with old sealant always removed completely and a 12-month guarantee.
- Water getting into walls through failed joints
- Old sealant gone brittle and cracked
- Joints with sealant missing in places
What external mastic looks like in Thatcham
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. With historic houses such as Shaw House (about 2.7 miles west) nearby, there’s older building stock in the area around Thatcham as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Rented homes near Thatcham station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. Managing a site like Spurcroft Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Thatcham is about 12 miles north-west of Basingstoke, in West Berkshire. Jobs in Thatcham get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our area takes in 155 places across West Berkshire, from the larger towns to small villages. For nearby work, see our Reading page (13 miles or so).
Postcode districts we cover here for external mastic: RG19 and RG18. Streets in the area include High Street, Station Road and Flagstaff Square. Thatcham sits on or near the A4, so getting to you is simple. Close by, we work in Benham Hill (1 mile west), Ashmore Green (2 miles north-west), Cold Ash (2 miles north), Upper Bucklebury (2 miles north-east) and Stone Copse (2 miles north-west). We also work in nearby towns such as Newbury (3 miles west), Burghfield Common (8 miles east), Speenhamland (3 miles west), Hungerford (11 miles west), Spencers Wood (12 miles east) and Calcot (9 miles east). Being one of West Berkshire’s larger places, Thatcham has homes, rented property and businesses of every kind.
What’s near Thatcham
Around Thatcham, our work takes us to homes and buildings near Kennet School and The Old Chequers Public House and the streets around them. For rail, the closest station is Thatcham station, roughly 0.9 miles south-east of the centre. Nearby you’ll also find Old Chapel Textile Centre (2.2 miles south-west) and West Berkshire Community Hospital (1.5 miles west). For a walk, there’s Nature Discovery Centre.
External mastic in Thatcham, done properly
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what access is needed. If you are dealing with joints with sealant missing in places and hard, crazed mastic that has stopped moving, we can put it right.
Garage door frames, porches and roofline trims are all part of external work in a town like Thatcham. Where two materials meet, they move differently, and the sealant has to allow for it.
Your job is guaranteed for a year, as with all our work.
- Location
- Thatcham (RG19, RG18)
- Wider area
- West Berkshire
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
How the visit works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours to a few days, depending on the length of joint and the access from start to finish. Parking in a town like Thatcham is generally straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Let us know if you’ve seen damp or leaks
- Plan for the work area to be out of bounds to pets and children
Get a quote
To get a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Related advice
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Housing providers, facilities teams and property managers book us too in Thatcham and across West Berkshire. Several sites can go on one quote.
What sealant work cannot fix
We won’t take on work that will not last, so these are the limits:
- Cracked brickwork or render that needs a builder or plasterer
- Damp that isn’t coming from the joint
- Cutting new joints into brickwork, which is building work rather than sealant work
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Where we work in Thatcham
- Render & cladding joints
- Façade panels
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
Thatcham questions
Can you do external mastic in Thatcham?
Yes. We work across London and the South East, and Thatcham is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Is there a guarantee on external mastic in Thatcham?
All our work, in Thatcham and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so it does not stand out.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Pointing it stops it working. We will reseal it with a flexible sealant.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces with primer where required.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Can you seal over the old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Towns and villages near Thatcham
Other services in Thatcham
Quotes for external mastic in Thatcham
There’s no set price list, because jobs vary so much. What we look at:
- Whether the work is at height
- The product the joint needs
- How many areas need sealing
- Any working-time requirements on site
Doing several joints on one visit is generally more efficient than separate visits. You will get one clear quote for the whole job.
Asking for a quote
What to tell us when you ask for a quote:
- Whether it’s a home or a business
- A few pictures by email, if you can
- The problem you’ve noticed
- Any previous sealing or DIY work
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we will take it from there.
What we’re called out for in Thatcham
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
It’s worth asking for a quote if you see:
- Failed seals between different materials
- Panel joints letting water in
- Hard, crazed mastic that has stopped moving
- Movement joints with cracked, split or missing sealant
For an older house near a landmark such as United Reformed Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Questions to ask before you book
- Is VAT in the price?
- Whether the sealant suits the joint
- Are they insured?
- The length of the guarantee
Looking after it afterwards
So the new joints stay in good condition:
- Deal with leaking gutters that soak the joints below
- Leave the joints unpainted unless we’ve said otherwise
- Have failed joints looked at early
- Clear growth from the base of walls and joints
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
Once a joint cannot move, the wall finds another way, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.