Wokingham · England
Charvil External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Charvil. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Plants rooting in failed movement joints
- Hard, crazed mastic that has stopped moving
- Water getting into walls through failed joints
FAQs for Charvil
Do you cover Charvil for external mastic?
Yes. We work across London and the South East, and Charvil is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will send you a clear quote.
Do you work for landlords with property near Twyford station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Do you seal joints where cladding meets other 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.
Do you guarantee your work?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
How long before the joint can be used?
Different products cure at different speeds, so follow the cure time we give you.
What is a movement joint?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose. We will reseal it with a flexible sealant.
External mastic in Charvil
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, leaving it bonded to two faces so it can move with the wall. We work on copings & trims, render & cladding joints and brickwork movement joints, and common reasons people get in touch are failed seals between different materials and plants rooting in failed movement joints.
Homes around Charvil 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, phone 0345 464 0079 or email us.
- Location
- Charvil (RG10)
- Region
- Wokingham
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
More services for Charvil
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Look over the joints every year, ideally after winter
- Leave the joints unpainted unless we’ve said otherwise
- Fix overflowing gutters above sealed joints
- Get split or bare joints resealed while the damage is small
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.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established.
When to call us in Charvil
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall.
These are the problems we are asked about most:
- Hard, crazed mastic that has stopped moving
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
- Failed seals between different materials
Homes close to St Patrick's Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- When the joint can take water or movement
- Whether all the old sealant comes out first
- Which sealant they’ll use, and why
- How much experience the applicator has
For landlords and businesses
We work for letting agents and landlords as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
Housing providers, facilities teams and property managers book us too in Charvil and across Wokingham. Several sites can be quoted together, and we are fully insured.
When something else is needed
It helps to know what we cannot do:
- Damp that is not coming from the joint
- Adding movement joints to masonry that has none
- Structural movement, which needs a surveyor or engineer
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
What we seal
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Façade panels
Why it’s worth doing now in Charvil
Water gets in through a failed movement joint. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Homes in smaller places like Charvil 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.
The cost depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before work begins, so you know where you stand.
What you get with us
- Sealant colour chosen to suit
- We never seal over old sealant
- White, clear, grey or another colour, product permitting
- You choose the colour before work begins
Take a look at what affects the cost and customer reviews.
How the visit works
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 usually takes a few hours to a few days, depending on the length of joint and the access. In a smaller place like Charvil, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- 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.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Move anything stored near the joints
- For business premises, tell us about site rules or sign-in
- Tell us about any water getting in
Ask for a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or drop us an email.
Read more
Charvil buildings and the weather
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Waingels College are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you let a flat or house near Twyford station, split movement joints are easy to miss on a rental until damp shows inside.
Charvil is about 2 miles north of Woodley, in Wokingham. Whether you are in the middle of Charvil or further out, external mastic is available for homes and businesses alike. Charvil is one of 35 towns and villages in Wokingham where we work for external mastic.
All of RG10 is within our area for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on Old Bath Road, Wenlock Edge and Pipistrelle Way or anywhere close by, our applicators can take on the job. Close by, we work in Twyford (1 mile east), Ruscombe (1 mile east), Whistley Green (1 mile south-east), Woodley (2 miles south) and Shiplake (2 miles north). We also work in nearby towns such as Reading (4 miles south-west), Wokingham (5 miles south), Earley (4 miles south-west), Crowthorne (8 miles south-east), Lower Earley (4 miles south-west) and Winnersh (3 miles south).
What’s near Charvil
Typical jobs here are in homes near The Piggott School, Polehampton Church of England Infant School and The Wagon And Horses Public House. The nearest railway station is Twyford station, about 0.9 miles east of the centre. Other landmarks nearby include Royal Berkshire Hospital (3.7 miles south-west) and Berkshire Medical Heritage Centre Museum (3.6 miles south-west). Green spaces nearby include Sonning Hill and South Lake.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.