Essex · England
Blackmore External Mastic
Professional external mastic in and around Blackmore, with every bit of old sealant taken out first.
- Damp patches traced to an open external joint
- Weeds or debris growing in open joints
- Movement joints with cracked, split or missing sealant
Landlords, agents and businesses in Blackmore
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.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
How we handle external mastic in Blackmore
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We take the old material out and do it properly. We’re often asked to deal with leaking joints around cladding and façade panels and sealant pulling away from one side of the joint, across render & cladding joints, joints between brick and frames and copings & trims.
Around Blackmore, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water usually gets in.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Location
- Blackmore (CM4)
- Region
- Essex
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Also near Blackmore
What else we do in Blackmore
Honest limits
We won’t take on work that won’t last, so these are the limits:
- Structural movement, which needs a surveyor or engineer
- Cracking across the wall rather than at a joint
- Cutting new joints into brickwork, which is building work rather than sealant work
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before you book.
Joints and surfaces we work on
- Façade panels
- Copings & trims
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. Around Blackmore, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Combining jobs into one visit usually makes better use of the time than several visits. You will get one clear quote for the whole job.
Why Blackmore clients choose us
- Colour picked to suit the job
- 4.9 on Google from 180+ five-star reviews
- White, clear, grey or coloured to suit, where the product allows
- Fully insured
Read what affects the cost and our reviews.
How the job changes by surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant.
When to call us in Blackmore
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
People usually contact us after spotting something like this:
- Rigid filler in a joint that should flex
- Movement joints with cracked, split or missing sealant
- Cracked joints where brick meets render or frames
- Weathered mastic that no longer stretches
Managing a site like Blackmore Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Before booking anyone
- Which sealant they’ll use, and why
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
- Whether VAT is included
How to look after the new joints
After the cure time, these simple habits help:
- Keep movement joints as flexible joints, not mortar
- Tell anyone working on the walls about the movement joints
- Leave the joints unpainted unless we have said otherwise
- Keep soil, plants and ivy away from the joints
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges over time.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Questions from Blackmore
Can you help a landlord with a rental near Ingatestone station?
Yes. We work for letting agents and landlords as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Can you do external mastic in Blackmore?
Yes. We work across London and the South East, and Blackmore is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing.
When will the joints need doing again?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
How do you reach high-level joints?
That depends on the building and the joints. We work on joints that can be reached safely. Give us some details and we will confirm the access.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Pointing it stops it working and can lead to cracking. A flexible sealant is the right fill.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages.
How it works
You don’t need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the work takes anything from a few hours to several days, depending on the building in most cases. For a village or hamlet like Blackmore, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- 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
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
- Keep children and pets away from the work area
Getting a quote
Getting a quote is simple: let us know what needs doing and where. A few photos by email make the job easier to understand, and we will take it from there.
Advice
External mastic in Blackmore: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Ingatestone Hall (about 3.8 miles south-east) are a reminder that the area around Blackmore 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.
Homes close to Church of St Laurence include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. If you let a flat or house near Ingatestone station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Blackmore is about 5 miles north of Brentwood, in Essex. Our applicators cover external mastic for homes and businesses in Blackmore, as part of our work across Essex. Across Essex, we cover 644 places, and Blackmore is one of them. There’s also a page for Chelmsford, about 8 miles away.
Work in CM4 is quoted and booked the same way as anywhere else. Local streets include Jericho Place, Woollard Way and Fingrith Hall Lane. If you are just outside Blackmore, we cover Wyatt's Green (2 miles south), Beggar Hill (2 miles east), Green Street (2 miles south-east), Doddinghurst (2 miles south) and Swallows Cross (2 miles south). We also work in nearby towns such as Chelmsford (8 miles north-east), Basildon (10 miles south-east), Harlow (10 miles north-west), Brentwood (5 miles south), Billericay (6 miles south-east) and Rayleigh (14 miles south-east).
Local landmarks in Blackmore
In Blackmore, that means homes and buildings near The Bull Inn and the streets around them. Blackmore’s nearest station is Ingatestone station, roughly 3.4 miles south-east. Well-known places in the area include Brentwood Community Hospital (4.8 miles south) and Willingale Doe (3.9 miles north).