Essex · England
Great Hallingbury External Mastic
Problem with your movement joints in Great Hallingbury? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Moss and dirt in joints with no sealant left
- Movement joints filled with mortar instead of sealant
- Movement joints with cracked, split or missing sealant
Work for landlords, hotels and businesses
Letting agents and landlords in Great Hallingbury can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
External mastic for homes and businesses in Great Hallingbury
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. We’re often asked to deal with moss and dirt in joints with no sealant left and cracked joints where brick meets render or frames, on render & cladding joints, copings & trims and brickwork movement joints.
Older homes in small places like Great Hallingbury may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Great Hallingbury (CM22)
- Wider area
- Essex
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Walls and rooflines in Great Hallingbury
Historic houses like Barrington Hall (about 2.6 miles south-east) are a reminder that the area around Great Hallingbury has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St Giles, an extension built onto an older house moves differently, and the joint between them takes the strain. Managing a site like Thorn Grove Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Great Hallingbury is about 2 miles south-east of Bishop's Stortford, in Essex. Whether you are in the middle of Great Hallingbury or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Great Hallingbury is one of 644 places in Essex we cover. We also work in Chelmsford, around 15 miles away.
Jobs for external mastic in CM22 is quoted and booked the same way as anywhere else. Other places close to Great Hallingbury include Little Hallingbury (1 mile south-west), Thorley Street (2 miles west), Bishop's Stortford (2 miles north-west), Gaston Green (2 miles south-west) and Birchanger (2 miles north). We also work in nearby towns such as Chelmsford (15 miles south-east), Harlow (7 miles south-west), Loughton (15 miles south), Saffron Walden (12 miles north), Waltham Abbey (14 miles south-west) and Great Dunmow (7 miles east).
Landmarks near Great Hallingbury
Around Great Hallingbury, our work takes us to homes and buildings near The Hertfordshire & Essex High School and Science College, among other places. Great Hallingbury’s nearest station is Bishops Stortford station, about 1.5 miles north-west of the centre. Other landmarks nearby include Herts and Essex Hospital (1.1 miles north-west) and Bishops Stortford Local History Museum (2.6 miles north-west). Not far away are Portingbury Hills and Rushy Mead.
Signs you need external mastic in Great Hallingbury
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
The most common problems we see are:
- Moss and dirt in joints with no sealant left
- Failed seals between different materials
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
For landlords with property near Bishops Stortford station, split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- What happens if they find a problem under the old sealant
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
What the job involves on each surface
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. We prime where the product needs it.
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
What we do, step by step
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation in most cases. In a small place like Great Hallingbury, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- 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.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Let us know if you’ve seen damp or leaks
- Clear items away from the joints we’re working on
Get a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
Advice
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Show decorators and builders where the movement joints are
- Fix overflowing gutters above sealed joints
- Check external joints each spring
- Ask before painting over external sealant
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
Great Hallingbury: your questions answered
Can you help a landlord with a rental near Bishops Stortford station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Will you come out to Great Hallingbury?
Yes. Great Hallingbury is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
How much does external mastic cost in Great Hallingbury?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or drop us an email and tell us what needs doing and where.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Can you match the colour of my brickwork?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so it doesn’t stand out.
How do you reach high-level joints?
It depends on the building. Where joints can be reached safely, we will do them. Give us some details and we’ll confirm the access.
What affects the cost of external mastic
There’s no set price list, because jobs vary so much. What we look at:
- Which sealant suits the joint
- The old material and how stubborn it is
- How many areas need sealing
- Any mould that needs treating
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Helping us quote
To make quoting easier, please include:
- The problem you’ve noticed
- Roughly how big the job is
- The type of property
- Any previous sealing or DIY work
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work.
Nearby places to Great Hallingbury
Also in Great Hallingbury
When something else is needed
We’ll always be straight with you, so here’s what new sealant won’t do:
- Damp that is not coming from the joint
- Render that’s blown, hollow or coming away
- Walls that need new movement joints cut into them
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Copings & trims
- Concrete & block