West Sussex · England
East Hampnett External Mastic
External mastic across East Hampnett and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
External mastic for homes and businesses in East Hampnett
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. Common call-outs are for moss and dirt in joints with no sealant left and sealant that has lost its bond to the brick or render, across copings & trims, render & cladding joints and joints between brick and frames.
Outside joints can only be sealed when they’re dry, so work in East Hampnett is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- East Hampnett (PO18)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
We won’t take on work that will not last, so these are the limits:
- Cracked brickwork or render that needs a builder or plasterer
- Adding movement joints to masonry that has none
- Render that is blown, hollow or coming away
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Copings & trims
- Render & cladding joints
Common questions in East Hampnett
I let a flat near Barnham station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Is East Hampnett in your area for external mastic?
Yes. We work across London and the South East, and East Hampnett is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will explain our choice.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
Do you work at height?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher ones, send details and we’ll confirm the access.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. The sealant is matched to both sides.
What colours does the sealant come in?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Around East Hampnett, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What you pay reflects the work, not a rough estimate. That is why we ask about the job first and agree the price before starting.
Why choose Mr Mastic in East Hampnett
- Over 20 years’ experience
- Fully insured
- Anti-fungal silicone where joints get wet
- We leave the area clean and tidy
Read our cost guide or customer reviews.
Should I try it myself first?
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 fails, we can still redo it.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
How it works
When we arrive, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before any work starts. The work generally takes a few hours to a few days, depending on the length of joint and the access. In a small place like East Hampnett, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Clear items away from the joints we are working on
- For indoor joints, keep the area dry beforehand if you can
- For business premises, tell us about site rules or sign-in
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and send you a clear quote.
Advice
Outside joints around East Hampnett
With historic houses such as Goodwood House (about 2.4 miles north-west) nearby, there’s older building stock in the area around East Hampnett 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.
In the older streets around The Parish Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain. For landlords with property near Barnham station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
East Hampnett is about 4 miles east of Chichester, in West Sussex. Wherever you are in the PO18 postcode area, our applicators can take on external mastic. Across West Sussex, we cover 371 places, and East Hampnett is one of them. Portsmouth is on our list too, about 17 miles from East Hampnett.
Our applicators cover all of the PO18 postcode area for external mastic. Whether your property is on Marsh Lane and East Hampnett Lane or anywhere close by, we can help. We also cover the places around East Hampnett: Crockerhill (1 mile north-east), Norton (1 mile east), Aldingbourne (1 mile south-east), Nyton (1 mile south-east) and Westergate (2 miles south-east). Within a short drive, we also cover Worthing (13 miles east), Bognor Regis (4 miles south), Chichester (4 miles west), Selsey (9 miles south-west), Littlehampton (8 miles east) and Emsworth (11 miles west).
Landmarks near East Hampnett
Typical jobs here are in homes near The Winterton Arms Public House and Ormiston Six Villages Academy. The closest station to East Hampnett is Barnham station, about 2.8 miles south-east of the centre. Well-known places in the area include The Chichester City Museum (3.7 miles west) and Tote Copse Castle (1.2 miles south). For a walk, there’s Levin Down.
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Clear growth from the base of walls and joints
- Keep high-pressure jets off the joints
- Have failed joints looked at early
- Keep movement joints as flexible joints, not mortar
Keep pressure washers away from the sealant. High-pressure water can lift the edges and let water in behind.
Act while the splits are small. At that stage it’s a simple cut out and reseal before water has had years to get in.
Signs you need external mastic in East Hampnett
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
The problems people normally mention when they call are:
- Joints where the bead has come unstuck
- Weathered mastic that no longer stretches
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
If you look after a building such as Tangmere Primary Academy, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- Which sealant they’ll use, and why
- When the joint can take water or movement
- Whether they’re fully insured
- Whether you can choose the colour
Surface by surface
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best year round.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.