Essex · England
External Mastic in Start Hill
Professional external mastic in and around Start Hill, with old sealant always removed completely and a 12-month guarantee.
- Damp patches traced to an open external joint
- Rigid filler in a joint that should flex
- Hard, crazed mastic that has stopped moving
How we handle external mastic in Start Hill
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. If you have joints with sealant missing in places and hard, crazed mastic that has stopped moving, we can help.
Around Start Hill, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
Each job carries a 12-month guarantee, whatever its size.
- Where
- Start Hill (CM22)
- Wider area
- Essex
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so neither cracks the other.
What we do, step by step
You do not need to clear the whole room or building before we come, only the area right around the joints. Everything nearby is protected, and the work takes a few hours to a few days, depending on the length of joint and the access for a typical job. Somewhere as small as Start Hill, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Move anything stored near the joints
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
Get a quote
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and give you a clear price before any work starts.
Read more
What we’re called out for in Start Hill
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
Signs it’s time to call us include:
- Cracked joints where brick meets render or frames
- Panel joints letting water in
- Rain getting behind render or cladding at a joint
- Joints where the bead has come unstuck
Schools such as Birchwood High School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- What product goes in the joint
- Whether they’re fully insured
- Whether all the old sealant comes out first
- How much experience the applicator has
What we cannot put right
We’ll always be straight with you, so here’s what sealant cannot fix:
- Damp that is not coming from the joint
- Cutting new joints into brickwork, which is building work rather than sealant work
- Subsidence or other structural problems
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Façade panels
External mastic in Start Hill: local notes
With historic houses such as Barrington Hall (about 2.8 miles south-east) nearby, there’s older building stock in the area around Start Hill as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Bishops Stortford station, split movement joints are easy to miss on a rental until damp shows inside. Historic houses such as Barrington Hall, about 2.8 miles south-east, show how far back building around Start Hill goes.
Start Hill is about 2 miles east of Bishop's Stortford, in Essex. If you need external mastic in Start Hill, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We cover Essex from our Crawley base, Start Hill included. Our Essex coverage runs to 644 places, and Start Hill is one of them. Our Chelmsford page covers work nearby (15 miles or so).
Here we cover the CM22 postcode area for external mastic. We cover properties on Start Hill and Provenance Close. Neighbouring places we cover for external mastic include Bedlar's Green (1 mile south), Takeley Street (2 miles east), Burton End (2 miles north), Takeley (2 miles east) and Smith's Green (3 miles east). Further out, we also cover Chelmsford (15 miles south-east), Braintree (15 miles east), Harlow (8 miles south-west), Saffron Walden (11 miles north), Waltham Abbey (15 miles south-west) and Great Dunmow (6 miles east).
Landmarks near Start Hill
We work in homes and buildings around The Three Willows pub, among other places. For rail, the closest station is Bishops Stortford station, about 1.9 miles west of the centre. Nearby you’ll also find House On The Hill Toy Museum (2.4 miles north) and Moated mound (4.5 miles west). The countryside around Start Hill includes Portingbury Hills and Rushy Mead.
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Have failed joints looked at early
- Make sure movement joints are not pointed over
- Clear growth from the base of walls and joints
- Check the sealant is paintable before painting near it
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
Once a joint can’t move, the wall finds another way, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
FAQs for Start Hill
Can you help a landlord with a rental near Bishops Stortford station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Will you come out to Start Hill?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Are you insured?
Yes. Mr Mastic is fully insured.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
Where are you based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Landlords, agents and businesses in Start Hill
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
DIY sealant or a professional job?
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.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.