Wokingham · England
External Mastic in Gardeners Green
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Gardeners Green and across Wokingham. Fully insured, ARBOMaster approved and guaranteed for a year.
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
External mastic for homes and businesses in Gardeners Green
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We work on façade panels, concrete & block and copings & trims, and common reasons people get in touch are joints where the bead has come unstuck and gaps where render, brick and frames meet.
Somewhere as small as Gardeners Green, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
Big or small, it’s backed by our 12-month guarantee.
- Location
- Gardeners Green (RG40)
- Region
- Wokingham
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes anything from a few hours to several days, depending on the building. In a small place like Gardeners Green, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
- Keep pets and children clear of the area while we work
Get a quote
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before work begins.
Related advice
Questions from Gardeners Green
Is Gardeners Green within the area you cover?
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.
Can you help a landlord with a rental near Wokingham station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
How long does external mastic last?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
What is a movement joint?
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.
What does external mastic cost?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or drop us an email and tell us what needs doing and where.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
How the job changes by surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap so the sealant is not too deep.
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Signs you need external mastic in Gardeners Green
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
It’s worth asking for a quote if you see:
- Weathered mastic that no longer stretches
- Brick movement joints where the sealant has split
- Movement joints filled with mortar instead of sealant
- Leaking joints around cladding and façade panels
Rented homes near Wokingham station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What to look for in a quote
- Whether all the old sealant comes out first
- Is VAT in the price?
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
What sealant work cannot fix
Some problems need a builder, plumber or other trade rather than us:
- Damp that is not coming from the joint
- Cutting new joints into brickwork, which is building work rather than sealant work
- Movement that is more than a sealant joint can take
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Joints between brick and frames
- Concrete & block
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
Towns and villages near Gardeners Green
Also in Gardeners Green
Walls and rooflines in Gardeners Green
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like Saint Sebastians Church of England Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. If you live in an older home near St Sebastian's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Gardeners Green is about 2 miles north-west of Crowthorne, in Wokingham. Across the RG40 area, we cover external mastic for homes and businesses. We cover 35 towns and villages across Wokingham. You can also see our page for Reading, roughly 8 miles from Gardeners Green.
Every address in RG40 is within our area for external mastic. If you need external mastic at a property on Honey Hill and Heathlands Road or a nearby road, we can help. Other places close to Gardeners Green include Holme Green (1 mile north-east), Little Sandhurst (3 miles south), Barkham (3 miles west), California (3 miles south-west) and Finchampstead (3 miles south-west). Larger places within reach include Reading (8 miles north-west), Woodley (5 miles north-west), Earley (6 miles north-west), Lower Earley (5 miles north-west), Winnersh (4 miles north-west) and Newtown (7 miles north-west).
Landmarks near Gardeners Green
Locally, jobs take us to homes and businesses close to Wixenford School, The Crooked Billet pub and St Crispin's School, among other places. For rail, the closest station is Wokingham station, roughly 1.8 miles north-west. Well-known places in the area include The Lexicon (3.3 miles north-east) and Pinewood Hospital (1 mile south-east). The countryside around Gardeners Green includes Holt Copse & Joel Park and Heath Lake.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Avoid pressure-washing directly into sealant joints
- Leave the joints unpainted unless we have said otherwise
- Walk round the building once a year and look at the joints
- Keep water from gutters off the wall
Don’t paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants are not designed to be painted and spoil the finish.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
For landlords and businesses
For anyone letting property in or around Gardeners Green, several properties can be quoted together. Just tell us the addresses and what each one needs.
Housing providers, facilities teams and property managers book us too in Gardeners Green and across Wokingham. Several sites can go on one quote, and we’re fully insured for the work.
Why it’s worth doing now in Gardeners Green
Sealing over the top of old mastic does not hold for long. The new layer cannot bond properly to old, weathered material, so the old joint is cut out fully first. Older cottages and farmhouses around Gardeners Green can have timber 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. Call for a quick quote and we’ll talk you through it.
Why Gardeners Green customers choose us
- Colour picked to suit the job
- A choice of colours where the product allows
- Colour agreed with you before we start
- More than 20 years in sealant work
Take a look at our cost guide and customer reviews.