Oxfordshire · England
Purley on Thames External Mastic
Movement joints in Purley on Thames need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Old sealant gone brittle and cracked
- Cracked joints where brick meets render or frames
- Weeds or debris growing in open joints
External mastic for homes and businesses in Purley on Thames
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. Typical jobs include movement joints filled with mortar instead of sealant and brick movement joints where the sealant has split, across concrete & block, render & cladding joints and copings & trims.
In a smaller place like Purley on Thames, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. That’s where gutter joints and wall joints tend to fail first.
All of our work is guaranteed for twelve months.
- Where
- Purley on Thames (RG8, RG31, RG4)
- Region
- Oxfordshire
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Signs you need external mastic in Purley on Thames
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Look out for any of the following:
- Plants rooting in failed movement joints
- Hard, crazed mastic that has stopped moving
- Sealant that has lost its bond to the brick or render
- Failed seals between different materials
Letting a property close to Tilehurst station? Then split movement joints are easy to miss on a rental until damp shows inside.
Before you book anyone
- What insurance they hold
- Which sealant they’ll use, and why
- Who turns up on the day
- What happens if they find a problem under the old sealant
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Purley on Thames and across Oxfordshire. We can quote a run of properties together, and we’re fully insured.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Avoid pressure-washing directly into sealant joints
- Don’t let climbing plants root in the sealant
- Get split or bare joints resealed while the damage is small
- Look over the joints every year, ideally after winter
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
What we cannot put right
In fairness, there are a few things sealant won’t fix:
- Loose or hollow render, which needs re-rendering
- Adding movement joints to masonry that has none
- Cracked brickwork or render that needs a builder or plasterer
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Where we work in Purley on Thames
- Façade panels
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
External mastic in Purley on Thames: local notes
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Mapledurham House (about 0.6 miles north-east) are a reminder that the area around Purley on Thames has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Homes close to Church of St Mary include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. If you look after a building such as Purley CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Purley on Thames is about 3 miles west of Caversham, in Oxfordshire. Purley on Thames gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 443 places in Oxfordshire are on our list, from the larger towns to small villages.
All of RG8, RG31 and RG4 is covered for external mastic. Whether your property is on Glebe Road, Hazel Road and Menpes Road or a nearby road, our applicators can take on the job. Close by, we work in Mapledurham (1 mile north-east), Tilehurst (1 mile south), Sulham (1 mile south-west), Little Heath (2 miles south) and Trench Green (2 miles north-east). Larger places within reach include Didcot (12 miles north-west), Henley-on-Thames (7 miles north-east), Benson (10 miles north), Wallingford (9 miles north-west), Great Western Park (13 miles north-west) and Watlington (11 miles north).
Landmarks near Purley on Thames
Locally, jobs take us to homes and businesses close to Denefield School, Round Copse and Roebuck pub and the streets around them. The nearest railway station is Tilehurst station, roughly 1 mile south-east. Nearby you’ll also find Battle Hospital (2.6 miles south-east) and Royal Berkshire Regiment Museum (2.4 miles south-east). For a walk, there’s Hosehill Lake and Moor Copse Nature Reserve.
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours for a handful of joints, longer for a whole elevation from start to finish. In a smaller place like Purley on Thames, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- 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
- Clear the area around the work
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Read more
Purley on Thames questions
Can you help a landlord with a rental near Tilehurst station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Is Purley on Thames in your area for external mastic?
Yes, Purley on Thames is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
Do you use backing rod?
That is backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Purley on Thames.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is usually more efficient.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
What affects the quote in Purley on Thames
Some jobs are bigger than they look, and some smaller. The main factors:
- Whether there’s mould to deal with
- Working hours on commercial sites
- Which sealant suits the joint
- Access and height
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or drop us an email and we’ll talk you through it.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- Photos by email, if that is easy
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
There’s no standard price list. Instead, we send you a clear quote for your job. To arrange one, ring 0345 464 0079 or drop us an email.
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.