Kent · England
Penshurst External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Penshurst, backed by a one-year guarantee. Ask us for a quote.
- Failed seals between different materials
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
External mastic for homes and businesses in Penshurst
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. If you have joints pointed up with cement by mistake and movement joints with cracked, split or missing sealant, we can help, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Penshurst is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
All our work is covered by our one-year guarantee, wherever you are in Kent.
- Where
- Penshurst (TN11)
- Region
- Kent
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What external mastic looks like in Penshurst
Historic houses like Penshurst Place (about 0.4 miles north-east) are a reminder that the area around Penshurst 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. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Penshurst station? Then split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Penshurst Church of England Voluntary Aided Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Penshurst is about 5 miles north-west of Royal Tunbridge Wells, in Kent. Anywhere in TN11, our applicators can take on external mastic. We cover 922 towns and villages across Kent, large and small. Our Crawley page covers work nearby.
Postcode districts we cover here for external mastic: TN11. You will find streets such as High Street, The Warren and Beckets Field, all of which we cover. If you’re just outside Penshurst, we cover Chiddingstone Hoath (2 miles west), Walter's Green (2 miles south), Chiddingstone Causeway (2 miles north), Fordcombe (2 miles south) and Teasley Mead (3 miles south-west). Further out, we also cover Sevenoaks (8 miles north), Royal Tunbridge Wells (5 miles south-east), Tonbridge (5 miles north-east), Kings Hill (12 miles north-east), Paddock Wood (9 miles east) and Southborough (4 miles east).
Around Penshurst
Locally, jobs take us to homes and businesses close to Chiddingstone Castle Park and Gardens and The Leicester Arms Hotel, among other places. For rail, the closest station is Penshurst station, roughly 1.8 miles north of the centre. A little further out are Tonbridge Cottage Hospital (4.2 miles east) and Chiddingstone Castle (1.8 miles north-west). The countryside around Penshurst includes Broadwater Warren RSPB Reserve and Barden Lake.
Places near Penshurst
More services for Penshurst
Different surfaces, different methods
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. A primer goes on where the product requires one before sealing.
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. We reseal them with a sealant suited to the panel material.
Penshurst: your questions answered
Do you work for landlords with property near Penshurst station?
Yes. We work for landlords and letting agents as well as homeowners. You can ring 0345 464 0079 or email us with the details for a clear quote.
Can you do external mastic in Penshurst?
Yes, Penshurst is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all.
How much does external mastic cost in Penshurst?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or drop us an email and tell us what needs doing and where.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Pointing it stops it working. A flexible sealant is the right fill.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
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. Exterior sealants come in a good range of colours.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding so the bead can stretch.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Check the sealant is paintable before painting near it
- Keep water from gutters off the wall
- Look over the joints every year, ideally after winter
- Act on the first splits you see
Keep pressure washers away from the sealant. High-pressure water can lift the edges and let water in behind.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
How it works
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. In a small place like Penshurst, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
- Mention any tricky access
Get 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, and we’ll come back to you with a quote.
Advice
Signs you need external mastic in Penshurst
Some movement joints have been pointed up with mortar. The joint can’t move, so the wall cracks somewhere else instead.
People normally contact us when they notice one of these:
- Weeds or debris growing in open joints
- Damp patches traced to an open external joint
- Gaps where render, brick and frames meet
- Leaking joints around cladding and façade panels
For an older house near a landmark such as Church of St John the Baptist, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Comparing quotes
- What product goes in the joint
- How much experience the applicator has
- How long the guarantee is
- Whether all the old sealant comes out first
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. Around Penshurst, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why choose Mr Mastic in Penshurst
- Arbo and Everbuild products
- 180+ five-star Google reviews
- We are fully insured
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide or our reviews.
For landlords and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
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.