Oxfordshire · England
External Mastic in Catslip
External mastic across Catslip and nearby, with every bit of old sealant taken out first.
- Rigid filler in a joint that should flex
- Damp patches traced to an open external joint
- Joints where the bead has come unstuck
Catslip questions
Do you cover Catslip for external mastic?
Yes, Catslip is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Do you work for landlords with property near Henley-On-Thames station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
What should I tell you?
Let us know what needs doing and where. If we need more, we will ask.
When will the joints need doing again?
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. Our work comes with a 12-month guarantee.
What’s an expansion joint in brickwork?
A vertical gap in a long brick wall is normally a movement joint. It lets the bricks expand without cracking.
External mastic for homes and businesses in Catslip
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a matching colour. If you have failed seals between different materials and plants rooting in failed movement joints, we can help, whatever the surface.
Around Catslip, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
All of our work is guaranteed for twelve months.
- Place
- Catslip (RG9)
- Wider area
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
To keep the joints looking good and working properly:
- Never let anyone fill a movement joint with mortar
- Have failed joints looked at early
- Walk round the building once a year and look at the joints
- Clear growth from the base of walls and joints
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Landlords, agents and businesses in Catslip
We also work for property managers and facilities teams. We can quote a run of properties together.
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
When something else is needed
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Structural movement, which needs a surveyor or engineer
- Cracked brickwork or render that needs a builder or plasterer
- Adding movement joints to masonry that has none
If you’re not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
Where we work in Catslip
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels
What happens on the day
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take a few hours to a few days, depending on the length of joint and the access. In a small place like Catslip, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
- Keep children and pets away from the work area
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work.
Read more
What the job involves on each surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so its sealant has to stay flexible.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Nearby places to Catslip
Also in Catslip
Outside joints around Catslip
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Greys Court (about 2.2 miles south-east) are a reminder that the area around Catslip 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.
Rented homes near Henley-On-Thames station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. Managing a site like Nettlebed Community School? Then larger buildings have long runs of movement joint that eventually need resealing.
Catslip is about 7 miles north of Caversham, in Oxfordshire. From the centre of Catslip to the outskirts, we cover external mastic for every kind of property. Catslip is one of 443 towns and villages in Oxfordshire where we work for external mastic. Reading is on our list too, around 9 miles away.
Every address in RG9 is within our area for external mastic. We also cover the places around Catslip: Nettlebed (1 mile north-west), Highmoor (1 mile south-west), Highmoor Cross (1 mile south), Bix (2 miles south-east) and Middle Assendon (2 miles east). Larger places within reach include Didcot (12 miles west), Abingdon-on-Thames (15 miles north-west), Thame (12 miles north), Henley-on-Thames (4 miles south-east), Benson (6 miles north-west) and Chinnor (9 miles north).
Near you in Catslip
Around Catslip, our work takes us to homes and buildings near The Sun Inn Public House. Catslip’s nearest station is Henley-On-Thames station, roughly 4.4 miles south-east. Green spaces nearby include Warburg Nature Reserve.
Common problems we fix in Catslip
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
Any of these means the joints need attention:
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
- Movement joints filled with mortar instead of sealant
- Water getting into walls through failed joints
If you live in an older home near Church of St Bartholomew, an extension built onto an older house moves differently, and the joint between them takes the strain.
Comparing quotes
- How much experience the applicator has
- Whether they seal over old material or remove it
- What happens if the job turns out different
- Is VAT in the price?
Quotes for external mastic in Catslip
For a quick quote, just ask. The main things that affect it are:
- Whether the work is at height
- The type of sealant required
- Working hours on commercial sites
- The number and length of the joints
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email and we will talk you through it.
What to tell us for a quote
When you call or email, it’s useful to know:
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.