Essex · England
External Mastic in Little Dunmow
Professional external mastic in and around Little Dunmow, with every bit of old sealant taken out first.
- Old sealant gone brittle and cracked
- Brick movement joints where the sealant has split
- Joints where the bead has come unstuck
The process
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from a few hours to several days, depending on the building. Parking around Little Dunmow is generally 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.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- For business premises, tell us about site rules or sign-in
- Move anything stored near the joints
- Keep children and pets away from the work area
Ask for a quote
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To arrange one, phone 0345 464 0079 or email us.
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About our external mastic in Little Dunmow
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 are often asked to deal with plants rooting in failed movement joints and failed seals between different materials, across render & cladding joints, joints between brick and frames and concrete & block.
Around Little Dunmow, garages, outbuildings and extensions all add to the joints on the outside of a home. Leaks normally start at a gutter end, a garage door frame or where an extension meets the house.
Big or small, you get the same one-year guarantee in Little Dunmow and across Essex.
- Location
- Little Dunmow (CM6)
- Region
- Essex
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need external mastic in Little Dunmow
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Look out for these signs:
- Failed seals between different materials
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
- Leaking joints around cladding and façade panels
If you live in an older home near Church of St Mary the Virgin, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before booking
- What happens if they find a problem under the old sealant
- Whether the sealant suits the joint
- When the joint can take water or movement
- How much experience the applicator has
Towns and villages near Little Dunmow
What else we do in Little Dunmow
What the job involves on each surface
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
Questions from Little Dunmow
Is external mastic in Little Dunmow guaranteed?
All our work, in Little Dunmow and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Will you come out to Little Dunmow?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Where is Mr Mastic based?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
How long will you be here?
A typical job takes a few hours to a few days, depending on the length of joint and the access, including preparation and clearing up. We will confirm how long when we quote.
Will the new joint stand out?
We choose a sealant colour to suit the brick, stone or render so the joint blends in. There’s a wide choice of exterior colours.
What is a movement joint?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you will get one quote.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
What affects the quote in Little Dunmow
Some jobs are bigger than they look, and some smaller. The main factors:
- How many areas need sealing
- The amount of work
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- If it’s domestic, commercial or a hotel
- How we’d reach the joints
- Roughly how big the job is
- Where the job is, and your postcode
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep movement joints as flexible joints, not mortar
- Clear growth from the base of walls and joints
- Check external joints each spring
- Tell anyone working on the walls about the movement joints
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
Little Dunmow buildings and the weather
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.
Schools such as The Flitch Green Academy are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Little Dunmow is about 6 miles west of Braintree, in Essex. We carry out external mastic for householders, landlords and businesses in Little Dunmow and the surrounding area. Little Dunmow is one of 644 towns and villages in Essex we cover for external mastic. There’s also a page for Chelmsford, about 9 miles away.
We cover every part of the CM6 postcode area for external mastic. That includes homes and businesses on Station Road, Worrin Road and Durand Lane and the roads around them. Nearby, we also carry out external mastic in Brookstreet (1 mile west), Felsted (1 mile east), Causeway End (1 mile south-east), North End (1 mile south) and Watch House Green (2 miles east). Further out, we also cover Chelmsford (9 miles south), Braintree (6 miles east), Harlow (14 miles south-west), Maldon (15 miles south-east), Witham (10 miles south-east) and Saffron Walden (13 miles north-west).
Landmarks near Little Dunmow
Around Little Dunmow, our work takes us to homes and buildings near Flitch Of Bacon Public House and the streets around them. Other landmarks nearby include Little Easton Moat (4 miles north-west) and Braintree Community Hospital (5.4 miles east). Green spaces nearby include Phyllis Currie Nature Reserve.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.