West Sussex · England
External Mastic in Fisher
External mastic for Fisher, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
- Rain getting behind render or cladding at a joint
When it is not the sealant
A few problems are outside what sealant work can do:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Where we work in Fisher
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Façade panels
- Copings & trims
External mastic in Fisher
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 and we use one wherever it does. Typical jobs include sealant pulling away from one side of the joint and joints with sealant missing in places, on brickwork movement joints, render & cladding joints and copings & trims.
Outside joints can only be sealed when they’re dry, so work in Fisher is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Whatever the size of the job, you get the same 12-month guarantee in Fisher and across West Sussex.
- Place
- Fisher (PO20)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near Fisher
Other services in Fisher
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together, and access only has to be arranged once. In a small place like Fisher, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not guesswork. That is why we ask a few questions first and give you a clear price before we start.
Why choose Mr Mastic in Fisher
- We agree the colour with you first
- More than 20 years in sealant work
- Homes, businesses and hotels
- 180+ five-star Google reviews
See our cost guide and our reviews.
For landlords and businesses
We work for landlords and letting agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
If you manage several properties in or around Fisher, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Should I try it myself first?
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.
If you are 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 does not work out, we can still put it right.
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Walk round the building once a year and look at the joints
- Leave the joints unpainted unless we have said otherwise
- Do not let climbing plants root in the sealant
- Keep high-pressure jets off the joints
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
Your questions about external mastic in Fisher
Does the coastal weather in Fisher affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Is Fisher within the area you cover?
Yes. Fisher is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is it OK to fill a movement joint with cement?
No. Cement or mortar cannot stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
I’m a tenant. Can you help?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
What should I tell you?
A short description and the location. If we need more, we’ll ask.
Does someone need to be in?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
How do I get a quote for external mastic in Fisher?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before we start.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides, primed where needed.
When to call us in Fisher
Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.
People usually contact us when they notice one of these:
- Joints pointed up with cement by mistake
- Leaking joints around cladding and façade panels
- Weeds or debris growing in open joints
- Movement joints with cracked, split or missing sealant
If you live in an older home near St Leodegar's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
What your quote should include
- Whether you can choose the colour
- How much experience the applicator has
- Whether the sealant suits the joint
- How the joint is cleaned and prepared
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 a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Fisher, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look over the joints with you, agree which to renew and talk through access.
- 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.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Tell us if parking is tricky
- Mention any tricky access
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Read more
Fisher buildings and the weather
Fisher is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. 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.
Managing a site like Chichester High School For Girls? Then larger buildings have long runs of movement joint that eventually need resealing. If you let a flat or house near Chichester station, outside joints that have cracked can let damp into a rental, so check them between lets.
Fisher is about 3 miles south of Chichester, in West Sussex. We carry out external mastic for homes and businesses in Fisher and nearby, as part of our work across West Sussex. 371 places in West Sussex are on our list, from the larger towns to small villages. Our Portsmouth page covers work nearby, about 14 miles away.
Jobs for external mastic in PO20 is quoted and booked the same way as anywhere else. Nearby, we also carry out external mastic in South Mundham (1 mile east), Street End (1 mile south-west), Sidlesham Common (1 mile west), Sidlesham (2 miles south-west) and Nyetimber (2 miles south-east). We also work in nearby towns such as Bognor Regis (3 miles east), Chichester (3 miles north), Selsey (5 miles south), Littlehampton (10 miles east), Emsworth (9 miles north-west) and Rustington (11 miles east).
What’s near Fisher
Fisher’s nearest station is Chichester station, about 2.5 miles north. Nearby you will also find Chichester Cathedral Treasury (2.7 miles north) and Chichester Castle (3 miles north).