East Sussex · England
External Mastic in Hamsey
Sealing brickwork movement joints, render, cladding and façade joints in Hamsey, with a one-year guarantee on every job. Call for a quick quote.
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
- Water getting into walls through failed joints
Signs you need external mastic in Hamsey
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, and it tears off the sides.
If you can see any of these, it’s time to have the joints looked at:
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
- Moss and dirt in joints with no sealant left
If you look after a building such as Hamsey Community Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- Which sealant they’ll use, and why
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- What the quote includes, VAT included or not
External mastic in Hamsey, done properly
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. If you are dealing with damp patches traced to an open external joint and sealant pulling away from one side of the joint, we can put it right, whatever the surface.
External sealant needs dry, clean surfaces, so work around Hamsey is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Hamsey (BN8)
- Wider area
- East Sussex
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Never let anyone fill a movement joint with mortar
- Keep water from gutters off the wall
- Point out the joints to other trades
- Leave the joints unpainted unless we have said otherwise
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
FAQs for Hamsey
Will you come out to Hamsey?
Yes, Hamsey is covered. Our work covers 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 help a landlord with a rental near Cooksbridge station?
Yes. We work for letting agents and landlords as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Hamsey, along with the rest of our area.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status and we are fully insured too.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it does not stand out.
How long does external mastic take?
That depends on how much there is to do, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We’ll tell you when we quote.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little.
What sealant work can’t fix
It helps to know what we can’t do too:
- Structural movement, which needs a surveyor or engineer
- Render that is blown, hollow or coming away
- Walls that need new movement joints cut into them
If you are not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Concrete & block
- Brickwork movement joints
DIY versus a professional finish
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.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
How we quote for external mastic
Every job gets its own quote. This is what makes a difference:
- The number and length of the joints
- The type of sealant required
- Whether there’s mould to deal with
- How many rooms, windows or areas are involved
What you pay reflects the work, not guesswork. That is why we ask a few questions first and agree the price before starting.
What to tell us for a quote
When you contact us, these details help:
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- How many joints, rooms or windows are involved
- Photos by email, if that is easy
Every job is quoted individually, so start by telling us what you need. Just ring 0345 464 0079 or send us an email with the details, and photos are welcome.
External mastic in Hamsey: local notes
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. With historic houses such as Anne of Cleves House (about 1.9 miles south) nearby, there’s older building stock in the area around Hamsey as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Cooksbridge station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. Homes close to The Parish Church of St Peter include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Hamsey is about 1 mile north of Lewes, in East Sussex. Anywhere in BN8, we cover external mastic for homes and businesses. Hamsey is one of 289 towns and villages in East Sussex where we work for external mastic. Brighton is on our list too, around 7 miles away.
We cover every part of BN8 for external mastic and the streets around it. Neighbouring places we cover for external mastic include Offham (1 mile south-west), South Malling (1 mile south), Lewes (1 mile south), Cliffe (2 miles south) and Southover (2 miles south). Further out, we also cover Eastbourne (14 miles south-east), Seaford (9 miles south-east), Hailsham (11 miles east), Crowborough (13 miles north-east), Uckfield (7 miles north-east) and Newhaven (7 miles south).
Around Hamsey
Locally, jobs take us to homes and businesses close to Railway Land, Priory School and The Blacksmiths Arms, among other places. The closest station to Hamsey is Cooksbridge station, about 0.8 miles north-west. Nearby you will also find Lewes Castle (1.6 miles south) and Lewes Victoria Hospital (1.5 miles south). Green spaces nearby include Malling Down and Offham Hill.
The process
The work is kept neat and contained to the area we are working on, so you can get on with your day. Expect the work to take anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Somewhere as small as Hamsey, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Keep children and pets away from the work area
- Mention any tricky access
- Let us know about earlier repairs to the joints
How to get a quote
Asking for a quote is easy: let us know 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.
Read more
More services for Hamsey
Surface by surface
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two so the movement is taken up.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it and keep the sealant to the right depth.