Oxfordshire · England
External Mastic in Great Western Park
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Great Western Park. Fully insured, ARBOMaster approved and guaranteed for a year.
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
- Joints with sealant missing in places
About our external mastic in Great Western Park
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. If you have failed sealant between panels on a façade and weeds or debris growing in open joints, we can help, on joints between brick and frames, brickwork movement joints and façade panels alike.
In a smaller place like Great Western Park, 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.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Great Western Park (OX11)
- Wider area
- Oxfordshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
External mastic in Great Western Park: local notes
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 Clifton Hampden Manor (about 4.4 miles north-east) nearby, there’s older building stock in the area around Great Western Park as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For site and facilities teams at buildings such as GEMS Didcot Primary Academy, its movement joints, gutters and trims need looking after like any other building’s. If you live in an older home near Church of St Matthew, an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near Didcot Parkway station, outside joints that have cracked can let damp into a rental, so check them between lets.
Great Western Park is about 1 mile west of Didcot, in Oxfordshire. Homes, rented property, offices and hotels in Great Western Park can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Great Western Park is one of 443 places in Oxfordshire we cover. Oxford is on our list too, around 10 miles away.
Our applicators cover all of OX11 for external mastic. You will find streets such as Holly Lane, Maple Road and Slade Road. Nearby, we also carry out external mastic in Didcot (1 mile east), Milton (2 miles north-west), Sutton Courtenay (2 miles north), Appleford-on-Thames (3 miles north-east) and Culham (3 miles north). We also work in nearby towns such as Oxford (10 miles north), Abingdon-on-Thames (5 miles north), Wantage (7 miles west), Grove (7 miles west), Faringdon (14 miles west) and Kidlington (15 miles north).
Near you in Great Western Park
Typical jobs here are in homes near The Wheatsheaf pub, UTC Oxfordshire and UTC Oxfordshire. For rail, the closest station is Didcot Parkway station, about 1.3 miles east of the centre. Well-known places in the area include Atlas Computer Laboratory (2.8 miles south-west) and Abingdon Community Hospital (4.7 miles north). Open spaces near Great Western Park include Churn Hill and Mowbray Fields.
Leave it or put it right?
Water gets in through a failed movement joint. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Homes in smaller places like Great Western Park can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost depends on the amount of work, how much old material has to come out and access to the work. We give a clear quote before work begins.
Why choose Mr Mastic in Great Western Park
- Fully insured
- Any old sealant cut out fully, not covered over
- 4.9 on Google from 180+ five-star reviews
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide or customer reviews.
Common questions in Great Western Park
Will you come out to Great Western Park?
Yes. Great Western Park is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Great Western Park for external mastic?
Yes, Great Western Park is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
How long does external mastic take?
That depends on how much there is to do, but as a guide it takes a few hours to a few days, depending on the length of joint and the access. We’ll give you a better idea when we quote.
Can tenants book the work?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
What colours does the sealant come in?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render.
Is there a guarantee?
Yes. There’s a 12-month guarantee on every job, wherever you are.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
Should I point up the gap in my brickwork?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. We will reseal it with a flexible sealant.
Surface by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod in a colour to suit the brick.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible year round.
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Ask before painting over external sealant
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
- Avoid pressure-washing directly into sealant joints
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
Also near Great Western Park
What else we do in Great Western Park
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours to a few days, depending on the length of joint and the access, depending on the amount of work. For a job in Great Western Park, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- 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.
Before we arrive
- Tell us if parking is tricky
- Mention any leaks or damp you’ve noticed
- Mention if the joints have been sealed before
Getting a quote
If you are in Great Western Park and need external mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Read more
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Loose or hollow render, which needs re-rendering
- Rising or penetrating damp from elsewhere in the wall
- Movement that’s more than a sealant joint can take
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Where we work in Great Western Park
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Concrete & block
- Façade panels
- Brickwork movement joints
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
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 fails, we can still redo it.