East Sussex · England
Grove Hill External Mastic
Problem with your movement joints in Grove Hill? We remove the old material, prepare the joints and seal them properly.
- Gaps where render, brick and frames meet
- Plants rooting in failed movement joints
- Movement joints filled with mortar instead of sealant
External mastic in Grove Hill
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. We work on façade panels, concrete & block and copings & trims, and common reasons people get in touch are water getting into walls through failed joints and sealant pulling away from one side of the joint.
Older homes in small places like Grove Hill may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
Your job is guaranteed for a year, as with all our work.
- Where
- Grove Hill (BN27)
- Region
- East Sussex
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant.
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Questions from Grove Hill
Is Grove Hill in your area for external mastic?
Yes. We work across London and the South East, and Grove Hill is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we will give you a clear price.
Is there a guarantee on external mastic in Grove Hill?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Should I point up the gap in my brickwork?
No, not if it’s a movement joint. Pointing it stops it working and can lead to cracking. A flexible sealant is the right fill.
Can you seal joints between two different materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Can landlords and businesses book you?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. In a small place like Grove Hill, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Mention any tricky access
- Mention any parking rules near the property
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.
Read more
Walls and rooflines in Grove Hill
Historic houses like Horselunges Manor (about 1.9 miles south-west) are a reminder that the area around Grove Hill 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. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Historic houses such as Horselunges Manor, about 1.9 miles south-west, show how far back building around Grove Hill goes, and older homes nearby need a sealant that suits their walls.
Grove Hill is about 3 miles north of Hailsham, in East Sussex. Whether you are in the middle of Grove Hill or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Grove Hill is one of 289 towns and villages in East Sussex where we work for external mastic. There’s also a page for Brighton, about 18 miles away.
Every address in BN27 is covered for external mastic. We also cover Vines Cross (2 miles north), Burlow (2 miles north-west), Horam (2 miles north-west), Warbleton (2 miles north) and Gun Hill (2 miles west). Further out, we also cover Eastbourne (8 miles south), Hastings (13 miles east), Bexhill-on-Sea (9 miles south-east), Seaford (12 miles south-west), Lewes (12 miles west) and Hailsham (3 miles south).
Landmarks near Grove Hill
A little further out are Herstmonceux Castle (3.7 miles south-east) and Sussex Farm Museum (2.4 miles north-west). Green spaces nearby include Selwyns Wood.
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
Why it’s worth doing now in Grove Hill
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. In a small place like Grove Hill, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why us?
- Every job guaranteed for a year
- Colour agreed with you before any work starts
- Arbo and Everbuild products
- A sealant colour to suit the surroundings
Quotes for external mastic in Grove Hill
Call for a quick quote. What matters most is:
- The number of rooms or windows
- Access and height
- Working hours on commercial sites
- Any mould that needs treating
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts.
What we need to know
What to tell us when you ask for a quote:
- If someone has resealed it before
- Whether it’s a home or a business
- The problem you’ve noticed
- Pictures of the joints, sent by email
We quote each job on its own. Simply phone 0345 464 0079 or email us and describe the job and send photos if you have them.
Looking after it afterwards
A little care helps the new joints last. We recommend:
- Never let anyone fill a movement joint with mortar
- Walk round the building once a year and look at the joints
- Point out the joints to other trades
- Ask before painting over external sealant
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.
Also near Grove Hill
What else we do in Grove Hill
Signs you need external mastic in Grove Hill
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
If you can see any of these, it’s time to have the joints looked at:
- Sealant that has lost its bond to the brick or render
- Movement joints filled with mortar instead of sealant
- Damp patches traced to an open external joint
- Weeds or debris growing in open joints
In and around Grove Hill, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- Whether the sealant suits the joint
- Is VAT in the price?
- How long the guarantee is
- How hidden problems are handled