Kent · England
External Mastic in Henley Street
Professional external mastic in and around Henley Street, with every bit of old sealant taken out first and a 12-month guarantee.
- Sealant pulling away from one side of the joint
- Gaps where render, brick and frames meet
- Hard, crazed mastic that has stopped moving
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Ask before painting over external sealant
- Do not let climbing plants root in the sealant
- Make sure movement joints aren’t pointed over
- Keep water from gutters off the wall
Do not paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
How we handle external mastic in Henley Street
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it. Common call-outs are for water getting into walls through failed joints and weeds or debris growing in open joints, across joints between brick and frames, render & cladding joints and brickwork movement joints.
External sealant needs dry, clean surfaces, so work around Henley Street is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
All our work comes with our one-year guarantee, wherever you are in Kent.
- Where
- Henley Street (DA13)
- Region
- Kent
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Quotes for external mastic in Henley Street
We don’t publish a price list, because no two jobs are the same. What we look at:
- The product the joint needs
- Whether old sealant or filler has to be cut out
- The number and length of the joints
- When we can work, for business premises
The cost depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- What’s wrong with the joints now
- A few photos by email, if you can
- How we’d reach the joints
- Where the property is
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or send us an email and describe the job and send pictures if you have them.
Towns and villages near Henley Street
Other services in Henley Street
When it is not the sealant
We’ll always be straight with you, so here’s what new sealant won’t do:
- Cracked brickwork or render that needs a builder or plasterer
- Subsidence or other structural problems
- Damp that is not coming from the joint
If in doubt, phone 0345 464 0079 or email us and we will say what we think before you book.
What we seal
- Concrete & block
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
Common problems we fix in Henley Street
Every building moves. 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.
Keep an eye out for these signs:
- Damp patches traced to an open external joint
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
- Failed seals between different materials
Rented homes near Sole Street station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
What your quote should include
- How long to leave it before use
- Whether you can choose the colour
- How long the guarantee is
- What happens if they find a problem under the old sealant
What happens on the day
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes anything from a few hours to several days, depending on the building. Somewhere as small as Henley Street, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
How to prepare
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
Getting a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Advice
Common questions in Henley Street
Can you do external mastic in Henley Street?
Yes, Henley Street is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Do you work for landlords with property near Sole Street station?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Do the sealants smell?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
How long should I leave it?
Different products cure at different speeds, so please follow the time we give you.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Henley Street.
Why it’s worth doing now in Henley Street
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost near the open joint, so the problem grows beyond the joint itself. Older cottages and farmhouses around Henley Street can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Why Henley Street clients choose us
- Every job guaranteed for a year
- Sealant colour chosen to suit
- We’re fully insured
- A choice of colours where the product allows
Read our cost guide and what customers say.
Walls and rooflines in Henley Street
Historic houses like Cobham College (about 0.8 miles north) are a reminder that the area around Henley Street 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. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as Cobham Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. In the older streets around Parish Church of St Peter and St Paul, an extension built onto an older house moves differently, and the joint between them takes the strain.
Henley Street is about 4 miles south of Gravesend, in Kent. If you need external mastic in Henley Street, it’s easy to get a quote: please phone 0345 464 0079 or email us. We cover Kent from our Crawley base, Henley Street included. Our Kent coverage runs to 922 places, Henley Street among them. Our London page covers work nearby, about 23 miles away.
We cover every part of the DA13 postcode area for external mastic. If you’re just outside Henley Street, we cover Luddesdown (1 mile south), Gold Street (1 mile north-west), Sole Street (1 mile north-west), Round Street (1 mile north-west) and Foxendown (1 mile south-west). We also work in nearby towns such as Maidstone (10 miles south-east), Sittingbourne (15 miles east), Dartford (9 miles north-west), Sevenoaks (11 miles south-west), Gravesend (4 miles north) and Tonbridge (13 miles south).
Around Henley Street
Typical jobs here are in homes near Camer Park Country Park, Meopham School and The Cock pub. Henley Street’s nearest station is Sole Street station, about 0.8 miles north-west of the centre. Well-known places in the area include Gravesham Community Hospital (4.7 miles north) and Rochester Castle (4.6 miles east). Open spaces near Henley Street include Ranscombe Farm and Gad's Hill.