Essex · England
External Mastic in Foster Street
External mastic for Foster Street, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Panel joints letting water in
- Plants rooting in failed movement joints
- Weathered mastic that no longer stretches
External mastic in Foster Street
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. Common call-outs are for weathered mastic that no longer stretches and cracked joints where brick meets render or frames, on brickwork movement joints, façade panels and render & cladding joints.
Older homes in small places like Foster Street 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.
Your job is guaranteed for a year, as with all our work.
- Location
- Foster Street (CM17)
- Wider area
- Essex
- Guarantee
- 12 months on all our work
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work can’t fix
It helps to know what we cannot do:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Rising or penetrating damp from elsewhere in the wall
- Cracking across the wall rather than at a joint
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before booking.
Joints and surfaces we work on
- Copings & trims
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
Landlords, agents and businesses in Foster Street
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
The process
When we arrive, we start by going over the job with you, so you know exactly what we are doing. We protect the surfaces around the joints before any work begins. The work generally takes anything from a few hours to several days, depending on the building. Somewhere like Foster Street needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
- Clear items away from the joints we are working on
Ask for a quote
There’s no standard price list. Instead, we give you a clear price for your job. To arrange one, call 0345 464 0079 or send us an email.
Read more
Nearby places to Foster Street
What else we do in Foster Street
Common questions in Foster Street
Is it worth replacing old sealant in an older home in Foster Street?
In most cases, yes, if it hasn’t been done for a while. Sealant is a maintenance item: how long it lasts depends on use, cleaning and exposure.
Will you come out to Foster Street?
Yes, Foster Street is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Should I point up the gap in my brickwork?
No. Rigid materials can’t move with the wall and the joint fails. If it has already been filled, we can normally cut it out and reseal it.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Do you use backing rod?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only.
Where are you based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
External mastic in Foster Street: local notes
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Foster Street is part of Harlow, one of the post-war new towns. Many homes date from the post-war decades and were built in phases, so whole streets can have gutters, trims and wall joints reaching the end of their life together.
Rented homes near Harlow Mill station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as Henry Moore Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Foster Street is about 2 miles east of Harlow, in Essex. Anywhere in CM17, our applicators can take on external mastic. Our area takes in 644 places across Essex. You can also see our page for Chelmsford, roughly 14 miles from Foster Street.
Postcode districts we cover here for external mastic: CM17. External mastic is available to properties on Foster Street, Highfield Close and Hastingwood Park and the roads around them. Other places close to Foster Street include Hastingwood (1 mile south), Newhall (1 mile north-west), Latton (1 mile west), Magdalen Laver (1 mile east) and Housham Tye (2 miles north-east). Further out, we also cover Chelmsford (14 miles east), Brentwood (11 miles south-east), Billericay (15 miles south-east), Loughton (9 miles south-west), Waltham Abbey (8 miles south-west) and Great Dunmow (12 miles north-east).
Landmarks near Foster Street
Around Foster Street, our work takes us to homes and buildings near John Barleycorn Public House, Passmores Academy and Brays Grove and the streets around them. Foster Street’s nearest station is Harlow Mill station, roughly 2.3 miles north-west. A little further out are Princess Alexandra Hospital (3 miles west) and Harlow Mill (2.4 miles north-west). Open spaces near Foster Street include Gernon Bushes.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Leave it or put it right?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together. Where a wall is exposed, as many are in small places like Foster Street, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference.
What you get with us
- Experience in homes, commercial sites and hotels
- Colour agreed with you before work begins
- Approved under the ARBOMaster scheme
- A 12-month guarantee on all work
Read what affects the cost or our reviews.
What affects the quote in Foster Street
The quote reflects the job in front of us. We take into account:
- How many areas need sealing
- Which sealant suits the joint
- Access and height
- Working hours on commercial sites
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or email us.
What to tell us for a quote
To make quoting easier, let us know:
- The address or postcode of the job
- Whether it’s a home or a business
- The problem you’ve noticed
- How many joints, rooms or windows are involved
If you are in Foster Street and need external mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.
Common problems we fix in Foster Street
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall.
Look out for any of the following:
- Joints with sealant missing in places
- Moss and dirt in joints with no sealant left
- Failed seals between different materials
- Old sealant gone brittle and cracked
For an older house near a landmark such as Church of All Saints, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Comparing quotes
- Which sealant they’ll use, and why
- How long to leave it before use
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing