West Berkshire · England
External Mastic in Theale
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Theale and across West Berkshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Rigid filler in a joint that should flex
- Failed seals between different materials
- Weathered mastic that no longer stretches
Walls and rooflines in Theale
Historic houses like Mapledurham House (about 3.8 miles north-east) are a reminder that the area around Theale has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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 Theale C.E. Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. Letting a property close to Theale station? Then split movement joints are easy to miss on a rental until damp shows inside.
Theale is about 4 miles west of Reading, in West Berkshire. Our applicators cover external mastic for householders, landlords and businesses in Theale and nearby. Our area takes in 155 places across West Berkshire, large and small.
Every address in RG7 is covered for external mastic. Whether your property is on Station Road, High Street and Bath Road or anywhere close by, we can help. Neighbouring places we cover for external mastic include Sheffield Bottom (1 mile south-east), Englefield (1 mile north-west), Calcot (1 mile east), Beansheaf Farm (1 mile east) and Trash Green (2 miles south-east). Within a short drive, we also cover Newbury (11 miles west), Thatcham (8 miles west), Burghfield Common (3 miles south), Speenhamland (11 miles west), Spencers Wood (5 miles south-east) and Shaw (10 miles west).
Local landmarks in Theale
In Theale, that means homes and buildings near Theale Green Community School, Red Lion pub and Calcot Park and the streets around them. Theale has its own railway station: Theale station. Other landmarks nearby include Battle Hospital (3.8 miles north-east) and Thames Valley Police Museum (1.2 miles south). The countryside around Theale includes Hosehill Lake and Moor Copse Nature Reserve.
External mastic in Theale, done properly
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. We work on copings & trims, concrete & block and joints between brick and frames, and people most often call us about rigid filler in a joint that should flex and hard, crazed mastic that has stopped moving.
Homes around Theale range from older cottages to newer houses, with walls and rooflines of every type. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Place
- Theale (RG7)
- Region
- West Berkshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
Sealant is not the answer to every problem, and we will tell you before work begins. It won’t solve:
- Render that’s blown, hollow or coming away
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp that isn’t coming from the joint
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
What we seal
- Façade panels
- Concrete & block
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
The process
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours for a handful of joints, longer for a whole elevation. Parking around Theale is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Clear items away from the joints we’re working on
- Plan for the work area to be out of bounds to pets and children
Getting a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand.
Related advice
Places near Theale
Also in Theale
What we’re called out for in Theale
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Any of these means the joints need attention:
- Sealant that has lost its bond to the brick or render
- Panel joints letting water in
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
In the older streets around Church of the Holy Trinity, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before booking
- Who turns up on the day
- How the joint is cleaned and prepared
- Whether VAT is included
- Whether all the old sealant comes out first
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Ask before painting over external sealant
- Keep high-pressure jets off the joints
- Deal with leaking gutters that soak the joints below
- Tell anyone working on the walls about the movement joints
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
What affects the cost of external mastic
There’s no set price list. The quote depends on:
- The number of rooms or windows
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
- The number and length of the joints
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Where the job is, and your postcode
- If someone has resealed it before
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, ring 0345 464 0079 or send us an email.
Theale: your questions answered
Is Theale in your area for external mastic?
Yes, Theale is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
Do you work for landlords with property near Theale station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just ring 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Where do you work from?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
Are you insured?
Yes, we’re fully insured for every job we do.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. Then phone 0345 464 0079 or send us an email.
Landlords, agents and businesses in Theale
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
How the job changes by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so neither cracks the other.