Oxfordshire · England
External & façade joints in Highmoor, Oxfordshire
Sealing brickwork movement joints, render, cladding and façade joints for Highmoor, backed by a 12-month guarantee. Call for a quick quote.
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
- Damp patches traced to an open external joint
External mastic in Highmoor
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. If you have weathered mastic that no longer stretches and failed seals between different materials, we can help, on joints between brick and frames, brickwork movement joints and concrete & block alike.
Outside joints can only be sealed when they’re dry, so work in Highmoor is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Where
- Highmoor (RG9)
- Region
- Oxfordshire
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Highmoor
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
We work for letting agents and landlords as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Do you need external mastic in Highmoor?
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Common reasons people contact us include:
- Water getting into walls through failed joints
- Weeds or debris growing in open joints
- Gaps where render, brick and frames meet
- Joints with sealant missing in places
Letting a property close to Henley-On-Thames station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Questions to ask before booking
- Is VAT in the price?
- Whether all the old sealant comes out first
- How much experience the applicator has
- The length of the guarantee
What the job involves on each surface
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out and helps it last.
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Highmoor: your questions answered
Do you work for landlords with property near Henley-On-Thames station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Will you come out to Highmoor?
Yes. Highmoor is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Can you seal joints between two different materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
Where are you based?
Mr Mastic is based in Crawley. We cover Highmoor and the rest of Oxfordshire.
What should I tell you?
Let us know what needs doing and where, with photos by email if possible. If we need more, we will ask.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Walls and rooflines in Highmoor
Historic houses like Greys Court (about 2 miles south-east) are a reminder that the area around Highmoor has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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.
Managing a site like Stoke Row Church of England School? Then larger buildings have long runs of movement joint that eventually need resealing. Homes close to Church of St Paul include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Highmoor is about 4 miles north-west of Henley-on-Thames, in Oxfordshire. Across the RG9 area, our applicators can take on external mastic. Highmoor is one of 443 places in Oxfordshire we cover. You can also see our page for Reading, about 7 miles away.
Every address in RG9 is covered for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on The Glebe and Holly Close or anywhere close by, our applicators can take on the job. We also cover the places around Highmoor: Highmoor Cross (1 mile south-east), Shepherd's Green (1 mile south-east), Catslip (1 mile north-east), Nettlebed (2 miles north) and Kingwood Common (2 miles south). Larger places within reach include Didcot (11 miles west), Abingdon-on-Thames (15 miles north-west), Thame (13 miles north), Henley-on-Thames (4 miles south-east), Benson (6 miles north-west) and Chinnor (11 miles north).
Local landmarks in Highmoor
Typical jobs here are in homes near The Dog and Duck pub and the streets around them. Highmoor’s nearest station is Henley-On-Thames station, about 4.5 miles east. The countryside around Highmoor includes Warburg Nature Reserve.
What happens on the day
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself generally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. In a small place like Highmoor, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Try not to wet indoor joints just before the visit
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details.
Read more
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Leave the joints unpainted unless we’ve said otherwise
- Clear growth from the base of walls and joints
- Keep water from gutters off the wall
- Tell anyone working on the walls about the movement joints
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage.
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In a small place like Highmoor, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
Why choose Mr Mastic in Highmoor
- We agree the colour with you first
- Approved under the ARBOMaster scheme
- 4.9 on Google from 180+ five-star reviews
- Fully insured