Hampshire · England
External Mastic in Greywell
External mastic for Greywell, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Cracked joints where brick meets render or frames
- Plants rooting in failed movement joints
- Panel joints letting water in
What we do, step by step
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to several days, depending on the building in most cases. In a small place like Greywell, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- 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.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Let us know about parking restrictions
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
Get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Related advice
External mastic for homes and businesses in Greywell
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing and we use one wherever it does. We are often asked to deal with weathered mastic that no longer stretches and joints where the bead has come unstuck, across copings & trims, concrete & block and façade panels.
External sealant needs dry, clean surfaces, so work around Greywell is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Greywell (RG29)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
External mastic in Greywell: local notes
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.
If you let a flat or house near Hook station, split movement joints are easy to miss on a rental until damp shows inside. Managing a site like Robert May's School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of St Mary the Virgin include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Greywell is about 6 miles east of Basingstoke, in Hampshire. Wherever you are in the RG29 postcode area, we cover external mastic for homes and businesses. Greywell is one of 683 towns and villages in Hampshire where we work for external mastic. For nearby work, see our Reading page.
We cover every part of the RG29 postcode area for external mastic. Local streets include The Street, Hook Road and Dorchester Way, all of which we cover. Close by, we work in Warnborough Green (1 mile north-east), North Warnborough (1 mile east), Up Nately (1 mile north-west), Nately Scures (1 mile north-west) and Hook Common (1 mile north). Further out, we also cover Basingstoke (6 miles west), Farnborough (9 miles east), Fleet (6 miles east), Aldershot (9 miles east), Alton (8 miles south) and Yateley (8 miles north-east).
Near you in Greywell
In Greywell, that means homes and buildings near Fox And Goose Public House, among other places. The closest station to Greywell is Hook station, about 1.4 miles north. Other landmarks nearby include West Green House Agricultural Museum (3.4 miles north-east) and Odiham Castle (less than half a mile north-east). Not far away are Tundry Hill and The Mill Field.
Common questions in Greywell
Can you help a landlord with a rental near Hook station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Is Greywell in your area for external mastic?
Yes. We work across London and the South East, and Greywell is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear quote.
How long before the joint can be used?
Different products cure at different speeds, so please follow the time we give you.
Where is Mr Mastic based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Can you quote for more than one area?
Yes. More than one area can go on one quote.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured for the work.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Check external joints each spring
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
- Get split or bare joints resealed while the damage is small
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.
Why it’s worth doing now in Greywell
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Where a wall is exposed, as many are in small places like Greywell, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
What you get with us
- Approved under the ARBOMaster scheme
- You choose the colour before work begins
- 4.9 on Google from 180+ five-star reviews
- Experience in homes, commercial sites and hotels
Take a look at how sealant jobs are priced or customer reviews.
Also near Greywell
What else we do in Greywell
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
What affects the quote in Greywell
The quote reflects the job in front of us. We take into account:
- How many areas need sealing
- The product the joint needs
- Whether old sealant or filler has to be cut out
- The number and length of the joints
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
What to tell us for a quote
You don’t need to know the technical terms. Just tell us:
- Roughly how big the job is
- Whether it has been sealed before
- Pictures of the joints, sent by email
- Where the job is, and your postcode
We don’t publish a price list, because every job is different. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or email us.
Surface by surface
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out.