Essex · England
External Mastic in Mountnessing
Our applicators work in Mountnessing on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Rigid filler in a joint that should flex
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
Surface by surface
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two.
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
External mastic in Mountnessing
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. If you have panel joints letting water in and movement joints with cracked, split or missing sealant, we can put it right.
External sealant needs dry, clean surfaces, so work around Mountnessing is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Your job is guaranteed for a year, as with all our work.
- Location
- Mountnessing (CM15)
- Wider area
- Essex
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in Mountnessing
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together. In a small place like Mountnessing, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in Mountnessing
- A 12-month guarantee on all work
- White, clear, grey or coloured to suit, where the product allows
- We are fully insured
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at what affects the cost and customer reviews.
Mountnessing buildings and the weather
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. Historic houses like Ingatestone Hall (about 1.6 miles east) are a reminder that the area around Mountnessing has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For site and facilities teams at buildings such as Mountnessing Church of England Primary School, larger buildings have long runs of movement joint that eventually need resealing. Ingatestone Hall, about 1.6 miles east, is one of the historic houses in the wider area around Mountnessing. Letting a property close to Ingatestone station? Then split movement joints are easy to miss on a rental until damp shows inside.
Mountnessing is about 3 miles north-east of Brentwood, in Essex. Across the CM15 area, we cover external mastic for homes and businesses. Our area takes in 644 places across Essex, large and small. For nearby work, see our Chelmsford page (8 miles or so).
Here we cover the CM15 postcode area for external mastic. External mastic is available to properties on Church Road, Roman Close and Roman Road and the roads around them. If you are just outside Mountnessing, we cover Swallows Cross (1 mile north-west), Green Street (1 mile north), Ingatestone (1 mile north-east), Buttsbury (2 miles east) and Hutton (2 miles south). Further out, we also cover Chelmsford (8 miles north-east), Basildon (7 miles south-east), Harlow (13 miles north-west), Brentwood (3 miles south-west), Maldon (15 miles east) and Canvey Island (13 miles south-east).
Landmarks near Mountnessing
Around Mountnessing, our work takes us to homes and buildings near Shenfield High School, Hutton Country Park and George and Dragon pub. For rail, the closest station is Ingatestone station, about 1.6 miles north-east of the centre. Other landmarks nearby include Brentwood Community Hospital (2.7 miles south-west). Green spaces nearby include Norsey Wood.
Places near Mountnessing
More services for Mountnessing
What we cannot put right
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Cracks in the bricks or render themselves, away from the joints
- Cutting new joints into brickwork, which is building work rather than sealant work
- Movement that is more than a sealant joint can take
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Where we work in Mountnessing
- Façade panels
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
Common questions in Mountnessing
Do you work for landlords with property near Ingatestone station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Do you cover smaller places like Mountnessing?
Yes, Mountnessing is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
Do you remove the old sealant?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Keep movement joints as flexible joints, not mortar
- Ask before painting over external sealant
- Deal with leaking gutters that soak the joints below
- Avoid pressure-washing directly into sealant joints
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Catch it early and you reduce the risk.
Quotes for external mastic in Mountnessing
The price is agreed before any work begins. It takes into account:
- How much there is to do
- Access and height
- Whether there’s mould to deal with
- The product the joint needs
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
Photos help, but a description is a good start. Please mention:
- A few pictures by email, if you can
- How we’d reach the joints
- Whether it’s a home or a business
- Whether it has been sealed before
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, ring 0345 464 0079 or send us an email.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We also work for property managers and facilities teams in Mountnessing and across Essex. We can quote a run of properties together, and we are fully insured for the work.
How it works
Before we leave, we go over the finished joints with you. The visit itself usually takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. In a small place like Mountnessing, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Clear the area around the work
- Mention any parking rules near the property
Ask for a quote
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.