Wokingham · England
External Mastic in Finchampstead
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Finchampstead. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Weathered mastic that no longer stretches
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
External mastic in Finchampstead
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. If you have rain getting behind render or cladding at a joint and plants rooting in failed movement joints, we can help.
Older homes in small places like Finchampstead may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Finchampstead (RG40)
- Region
- Wokingham
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
So the new joints stay in good condition:
- Keep high-pressure jets off the joints
- Leave the joints unpainted unless we have said otherwise
- Look over the joints every year, ideally after winter
- Point out the joints to other trades
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.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost near the open joint, so the problem grows beyond the joint itself. Around Finchampstead, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email.
Why book with us
- Neat joints and a tidy finish
- Anti-fungal sanitary silicone in wet areas
- A choice of colours where the product allows
- A sealant colour to suit the surroundings
Read our cost guide or what customers say.
When to call us in Finchampstead
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
If you can see any of these, it’s time to have the joints looked at:
- Weathered mastic that no longer stretches
- Movement joints with cracked, split or missing sealant
- Water getting into walls through failed joints
- Panel joints letting water in
In the older streets around Church of St James, the joints between older walls, newer extensions and the roofline need a sealant that can move.
What your quote should include
- Whether the sealant suits the joint
- Whether they’re fully insured
- What happens if the job turns out different
- How much experience the applicator has
Common questions in Finchampstead
Do you cover smaller places like Finchampstead?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
I let a flat near Crowthorne station. Can you help?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages to suit the site.
Are you fully insured?
Yes. We are fully insured.
Can you seal joints between two different materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. The sealant is matched to both sides.
How do I get a quote for external mastic in Finchampstead?
Size, access and the old material all affect the cost. Call for a quick quote.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding so the bead can stretch.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
What external mastic looks like in Finchampstead
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.
If you look after a building such as Finchampstead CofE VA Primary School, its movement joints, gutters and trims need looking after like any other building’s. If you let a flat or house near Crowthorne station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Finchampstead is about 2 miles north-west of Yateley, in Wokingham. Whether you’re in the middle of Finchampstead or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. We cover 35 towns and villages across Wokingham, from the larger towns to small villages. Reading is on our list too, around 8 miles away.
Jobs for external mastic in RG40 works the same way as everywhere else we cover. Streets in the area include The Village, Manor Barns Lane and Longwater Lane, all of which we cover. We also cover the places around Finchampstead: Eversley Centre (1 mile south-west), Eversley Cross (1 mile south), California (1 mile north-west), Eversley (1 mile west) and Lower Common (2 miles west). Further out, we also cover Reading (8 miles north-west), Wokingham (3 miles north), Woodley (7 miles north), Earley (6 miles north-west), Crowthorne (3 miles east) and Lower Earley (5 miles north-west).
Near you in Finchampstead
Locally, jobs take us to homes and businesses close to The Queen's Oak pub, Shepperlands Farm Nature Reserve and Yateley School. The nearest railway station is Crowthorne station, roughly 1.7 miles east. A little further out are Pinewood Hospital (3.2 miles north-east). For a walk, there’s Wildmoor Heath and Horseshoe Lake.
Places near Finchampstead
What else we do in Finchampstead
What happens on the day
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself generally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. In a small place like Finchampstead, 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.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Mention any leaks or damp you’ve noticed
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or email us.
Read more
What we can’t put right
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Rising or penetrating damp from elsewhere in the wall
- Render that is blown, hollow or coming away
- Subsidence or other structural problems
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Copings & trims
Surface by surface
Cladding and façade panels
If the façade has a specified sealant, that is what we use or an approved alternative. Tell us what the building has when you get in touch.
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one.