West Sussex · England
Partridge Green External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Partridge Green, with a 12-month guarantee on every job. Ask us for a quote.
- Panel joints letting water in
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
External mastic in Partridge Green, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you have movement joints filled with mortar instead of sealant and moss and dirt in joints with no sealant left, we can put it right, on render & cladding joints, concrete & block and façade panels alike.
Around Partridge Green, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water generally gets in, and they need the right sealant at the right depth.
You’re covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Location
- Partridge Green (RH13)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Common questions in Partridge Green
Can you do external mastic in Partridge Green?
Yes, Partridge Green is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Will you come out to Partridge Green?
Yes, we do. 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.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
What is a movement joint?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Is it OK to fill a movement joint with cement?
No. Cement or mortar cannot stretch. Where a joint has been mortared, it can often be raked out and sealed properly.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used before we leave.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
How we quote for external mastic
We don’t publish a price list, because jobs vary so much. The quote depends on:
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
- The size of the job
- Mould in or behind the old joints
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
Helping us quote
To make quoting easier, let us know:
- How we’d reach the joints
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
- The rough size of the job
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before work begins.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Walls and rooflines in Partridge Green
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Jolesfield CofE Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Partridge Green is about 7 miles south of Horsham, in West Sussex. From the centre of Partridge Green to the outskirts, external mastic is available for homes and businesses alike. Our West Sussex coverage runs to 371 places, Partridge Green among them. There’s also a page for Crawley, roughly 12 miles from Partridge Green.
Work in RH13 works the same way as everywhere else we cover. Streets in the area include High Street, Church Road and Oakwood, and we cover them all. We also cover the places around Partridge Green: Littleworth (1 mile north), West Grinstead (1 mile north-west), Ashurst (2 miles south-west), Dial Post (2 miles west) and Shipley (3 miles north-west). Further out, we also cover Crawley (12 miles north-east), Horsham (7 miles north), Worthing (10 miles south-west), Haywards Heath (9 miles east), Burgess Hill (8 miles east) and Littlehampton (14 miles south-west).
What’s near Partridge Green
Open spaces near Partridge Green include Knepp Wildland.
How the visit works
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. In a small place like Partridge Green, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Clear items away from the joints we’re working on
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
Get a quote
If you’re in Partridge Green and need external mastic, phone 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
Do you need external mastic in Partridge Green?
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
Common reasons people contact us are:
- Water getting into walls through failed joints
- Moss and dirt in joints with no sealant left
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
In the older streets around St Michael and All Angels Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- What happens if the job turns out different
- Whether they’re fully insured
- Which colour the sealant will be
- Whether VAT is included
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Deal with leaking gutters that soak the joints below
- Keep soil, plants and ivy away from the joints
- Avoid pressure-washing directly into sealant joints
- Never let anyone fill a movement joint with mortar
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.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Catch it early and you reduce the risk.
Landlords, agents and businesses in Partridge Green
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
We also work for property managers and facilities teams. We can quote a run of properties together.