Oxfordshire · England
Stonor External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Stonor. Fully insured, ARBOMaster approved and guaranteed for a year.
- Plants rooting in failed movement joints
- Joints where the bead has come unstuck
- Water getting into walls through failed joints
External mastic in Stonor
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. We work on copings & trims, concrete & block and façade panels, and the jobs we see most are weeds or debris growing in open joints and old sealant gone brittle and cracked.
Somewhere as small as Stonor, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Stonor (RG9)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of external mastic
We do not publish a price list, because jobs vary so much. The quote depends on:
- Access and height
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- Which sealant suits the joint
Combining jobs into one visit usually makes better use of the time than several visits. You will get one clear quote for the whole job.
What we need to know
When you contact us, it’s useful to know:
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- Roughly how big the job is
- Whether it has been sealed before
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we’ll take it from there.
Outside joints around Stonor
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Stonor Park (about 0.5 miles south-east) nearby, there’s older building stock in the area around Stonor as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you live in an older home near Pishill Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Stonor is about 5 miles north of Henley-on-Thames, in Oxfordshire. Every kind of property in Stonor can book us for external mastic. Every job comes with our one-year guarantee. Stonor is one of 443 places in Oxfordshire we cover for external mastic. Our Reading page covers work nearby (11 miles or so).
Every address in RG9 is covered for external mastic. Neighbouring places we cover for external mastic include Turville Heath (1 mile north-east), Northend (2 miles north), Christmas Common (2 miles north-west), Cookley Green (3 miles west) and Howe Hill (3 miles north-west). Further out, we also cover Didcot (13 miles west), Thame (10 miles north), Henley-on-Thames (5 miles south), Benson (7 miles west), Chinnor (7 miles north) and Tilehurst (11 miles south-west).
Local landmarks in Stonor
In Stonor, that means homes and buildings near The Crown Inn Public House. For a walk, there’s Warburg Nature Reserve and Bald Hill.
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Nearby places to Stonor
More services for Stonor
How it works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as Stonor, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- 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 stairs, lifts or work at height
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
Getting a quote
If you are in Stonor and need external mastic, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before we start.
Related advice
Do you need external mastic in Stonor?
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, and it tears off the sides.
Any of these means the joints need attention:
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Old sealant gone brittle and cracked
- Brick movement joints where the sealant has split
In and around Stonor, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- Are they insured?
- How the joint is cleaned and prepared
- Which sealant they’ll use, and why
- What the quote includes, VAT included or not
What sealant work cannot fix
We will not take on work that won’t last, so these are the limits:
- Movement that’s more than a sealant joint can take
- Cracking across the wall rather than at a joint
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Joints and surfaces we work on
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Façade panels
- Brickwork movement joints
- Concrete & block
Why deal with it now?
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost near the open joint, so the problem grows beyond the joint itself. Where a wall is exposed, as many are in small places like Stonor, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why book with us
- Sanitary silicone with an anti-fungal additive in wet areas
- We agree the colour with you first
- 4.9 on Google from 180+ five-star reviews
- We leave the area clean and tidy
See our cost guide or our reviews.
For landlords and businesses
Letting agents and landlords in Stonor can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Stonor: your questions answered
What guarantee comes with external mastic in Stonor?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you cover Stonor for external mastic?
Yes. Our work covers London and the South East, and Stonor is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme.
Can you match the colour of my brickwork?
We choose a sealant colour to suit the brick, stone or render. There’s a wide choice of exterior colours.
How do I get a quote for external mastic in Stonor?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before any work starts.
How long does external mastic last?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Every job carries our one-year guarantee.