Essex · England
Dedham Heath External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Dedham Heath and across Essex. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Joints pointed up with cement by mistake
- Water getting into walls through failed joints
- Leaking joints around cladding and façade panels
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Ask before painting over external sealant
- Make sure movement joints aren’t pointed over
- Deal with leaking gutters that soak the joints below
- Keep soil, plants and ivy away from the joints
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead over time.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.
External mastic for homes and businesses in Dedham Heath
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. If you’re dealing with rigid filler in a joint that should flex and cracked joints where brick meets render or frames, we can help, whatever the surface.
Around Dedham Heath, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
Big or small, it’s backed by our one-year guarantee in Dedham Heath and across Essex.
- Location
- Dedham Heath (CO7, CO11)
- Wider area
- Essex
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What external mastic looks like in Dedham Heath
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Castle House (about 0.5 miles north) nearby, there’s older building stock in the area around Dedham Heath as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For an older house near a landmark such as Parish Church of St Mary, old and new materials meet at the roofline and walls, which is where sealant earns its keep. If you look after a building such as Dedham Church of England Voluntary Controlled Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Dedham Heath is about 6 miles north-east of Colchester, in Essex. Every kind of property in Dedham Heath can book us for external mastic. Every job comes with our 12-month guarantee. Dedham Heath is one of 644 towns and villages in Essex where we work. There’s also a page for Chelmsford, roughly 26 miles from Dedham Heath.
We cover every part of the CO7 and CO11 postcode area for external mastic and the streets around it. If you need external mastic at a property on Coggeshall Road, The Heath and Dedham Meade or a nearby road, we can help. Neighbouring places we cover for external mastic include Lamb Corner (1 mile west), Dedham (1 mile north), Ardleigh Heath (1 mile south-west), Ardleigh (1 mile south) and Stratford St Mary (2 miles north-west). Within a short drive, we also cover Colchester (6 miles south-west), Clacton-on-Sea (12 miles south-east), Harwich (11 miles east), Camulodunum (7 miles south-west), Halstead (15 miles west) and Greenstead (4 miles south-west).
Local landmarks in Dedham Heath
Around Dedham Heath, our work takes us to homes and buildings near The Anchor Inn and Manningtree High School. Dedham Heath’s nearest station is Manningtree station, roughly 2.1 miles east of the centre. Well-known places in the area include Severalls Hospital (4.7 miles west) and Little Wenham Castle (4.9 miles north). For a walk, there’s Cattawade Marshes.
Honest limits
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Movement that is more than a sealant joint can take
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Adding movement joints to masonry that has none
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
What we seal
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Copings & trims
- Concrete & block
- Joints between brick and frames
Dedham Heath: your questions answered
Will you come out to Dedham Heath?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is Dedham Heath in your area for external mastic?
Yes, Dedham Heath is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
What’s an expansion joint in brickwork?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator.
How long should I leave it?
Different products cure at different speeds, so please follow the time we give you when we finish.
Can you do several jobs on one visit?
Yes. Just list everything you need.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Is there a guarantee?
Yes. All our work carries our 12-month guarantee.
The process
There is not much for you to do on the day. Show us the job and we will take it from there. The work itself takes a few hours for a handful of joints, longer for a whole elevation. Somewhere like Dedham Heath needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
How to get a quote
Need a quote? Please call 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
Work for landlords, hotels and businesses
Landlords and agents in Dedham Heath can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
For anyone letting property in or around Dedham Heath, several properties can be quoted together. Just tell us the addresses and what each one needs.
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Places near Dedham Heath
More services for Dedham Heath
What we are called out for in Dedham Heath
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
It’s worth asking for a quote if you see:
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
- Panel joints letting water in
- Movement joints filled with mortar instead of sealant
For landlords with property near Manningtree station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before you book
- What insurance they hold
- Which sealant they’ll use, and why
- What happens if they find a problem under the old sealant
- What preparation is included
Different surfaces, different methods
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.