Kent · England
External Mastic in Round Street
External mastic for Round Street and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Damp patches traced to an open external joint
- Gaps where render, brick and frames meet
- Rigid filler in a joint that should flex
What sealant work cannot fix
It helps to know what we can’t do too:
- Loose or hollow render, which needs re-rendering
- Rising or penetrating damp from elsewhere in the wall
- Subsidence or other structural problems
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Surfaces we seal
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Brickwork movement joints
How we handle external mastic in Round Street
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing and we use one wherever it does. Common call-outs are for movement joints with cracked, split or missing sealant and plants rooting in failed movement joints, across façade panels, brickwork movement joints and copings & trims.
In a village or hamlet like Round Street, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or email us.
- Place
- Round Street (DA13)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Round Street
Other services in Round Street
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Avoid pressure-washing directly into sealant joints
- Deal with leaking gutters that soak the joints below
- Clear growth from the base of walls and joints
- Leave the joints unpainted unless we have said otherwise
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
A joint that has stopped moving pushes the movement elsewhere, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Questions from Round Street
Do you cover smaller places like Round Street?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you do external mastic in Round Street?
Yes. Our work covers London and the South East, and Round Street is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear price.
Should I point up the gap in my brickwork?
No. Rigid materials can’t move with the wall and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Why is there a gap in my brick wall?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
How long does the job take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we’ll tell you how long to expect.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
Can landlords and businesses book you?
Yes, we do. We work in homes, commercial premises and hotels.
Outside joints around Round Street
With historic houses such as Cobham College (about 0.9 miles east) nearby, there’s older building stock in the area around Round Street 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Cobham Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For landlords with property near Sole Street station, split movement joints are easy to miss on a rental until damp shows inside.
Round Street is about 3 miles south of Gravesend, in Kent. Every kind of property in Round Street is covered for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. We cover 922 towns and villages across Kent, from the larger towns to small villages. There’s also a page for London, about 22 miles away.
We cover every part of DA13 for external mastic and the streets around it. Neighbouring places we cover for external mastic include Sole Street (1 mile south), Gold Street (1 mile south-east), Nash Street (1 mile west), Meopham (1 mile south-west) and Henley Street (1 mile south-east). Further out, we also cover Maidstone (11 miles south-east), Dartford (8 miles north-west), Sevenoaks (11 miles south-west), Gravesend (3 miles north), Tonbridge (14 miles south) and Northfleet (3 miles north-west).
Near you in Round Street
Typical jobs here are in homes near The Railway Inn, Jeskyns and Meopham School, among other places. For rail, the closest station is Sole Street station, roughly 0.6 miles south of the centre. Nearby you’ll also find Gravesham Museum (3.5 miles north) and Gravesham Community Hospital (3.6 miles north). The countryside around Round Street includes Gad's Hill and Ranscombe Farm.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you’re set on DIY, put the effort into 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.
Landlord and commercial work in Round Street
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Common problems we fix in Round Street
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
Look out for these signs:
- Moss and dirt in joints with no sealant left
- Joints pointed up with cement by mistake
- Movement joints with cracked, split or missing sealant
- Failed seals between different materials
In the older streets around St Mary's Room, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before you book anyone
- What the quote includes, VAT included or not
- What the cure time is
- Whether they seal over old material or remove it
- What insurance they hold
Why deal with it now?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Around Round Street, 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, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
Why book with us
- Trusted Arbo and Everbuild sealants
- Anti-fungal sanitary silicone in wet areas
- We agree the colour with you first
- Tidy, careful work
See what affects the cost and customer reviews.
How it works
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. Somewhere like Round 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.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Keep children and pets away from the work area
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
Getting a quote
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.