West Berkshire · England
External Mastic in Ashmansworth
External mastic for Ashmansworth, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
- Damp patches traced to an open external joint
How we handle external mastic in Ashmansworth
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. We work on copings & trims, concrete & block and render & cladding joints, and the jobs we see most are failed seals between different materials and movement joints filled with mortar instead of sealant.
Outside joints can only be sealed when they’re dry, so work in Ashmansworth is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Big or small, it’s backed by our one-year guarantee.
- Where
- Ashmansworth (RG20)
- Wider area
- West Berkshire
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
Before booking, it’s worth knowing the limits too:
- Rising or penetrating damp from elsewhere in the wall
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Leave the joints unpainted unless we’ve said otherwise
- Make sure movement joints are not pointed over
- Check external joints each spring
- Avoid pressure-washing directly into sealant joints
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
Nearby places to Ashmansworth
Also in Ashmansworth
What affects the cost of external mastic
The price is agreed before any work begins. It takes into account:
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- Any working-time requirements on site
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Asking for a quote
What to tell us when you ask for a quote:
- Where the job is, and your postcode
- The rough size of the job
- Access, such as stairs, a lift or height
- Whether it has been sealed before
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 email photos if that is easy.
Surface by surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it and keep the sealant to the right depth.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible in all weathers.
Ashmansworth buildings and the weather
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Highclere Castle (about 1.9 miles north-east) are a reminder that the area around Ashmansworth 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.
If you live in an older home near Church of St James, an extension built onto an older house moves differently, and the joint between them takes the strain. In and around Ashmansworth, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Ashmansworth is about 7 miles south-west of Newbury, in West Berkshire. Our applicators cover external mastic for homeowners, landlords and businesses in Ashmansworth, as part of our work across West Berkshire. Our West Berkshire coverage runs to 155 places, and Ashmansworth is one of them. We also work in Reading, about 21 miles from Ashmansworth.
All of RG20 is within our area for external mastic. We also cover Test Valley (1 mile west), Vernham Street (4 miles west), Hell Corner (5 miles north-west), Upper Green (5 miles north-west) and Inkpen Common (5 miles north-west). Within a short drive, we also cover Newbury (7 miles north-east), Thatcham (9 miles north-east), Speenhamland (7 miles north-east), Hungerford (8 miles north-west), Lambourn (14 miles north) and Shaw (7 miles north-east).
Landmarks near Ashmansworth
The countryside around Ashmansworth includes Sidown Hill.
What happens on the day
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. It usually takes a few hours to a few days, depending on the length of joint and the access. In a small place like Ashmansworth, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- 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.
Before we arrive
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
To get a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear price before any work starts.
Read more
Your questions about external mastic in Ashmansworth
Is Ashmansworth in your area for external mastic?
Yes, Ashmansworth is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to Ashmansworth?
Yes, Ashmansworth is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Are you ARBOMaster approved?
Yes. We’re an ARBOMaster approved applicator.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
How do you reach high-level joints?
It depends on the building. Tell us the height, the number of joints and what’s below them and we’ll confirm how they can be reached safely.
Is there a guarantee?
Yes. All our work carries our one-year guarantee.
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.
Will the old sealant be removed?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Should I try it myself first?
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 doesn’t work out, we can still put it right.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Why deal with it now?
Sealing over the top of old mastic does not hold for long. The new layer cannot bond properly to old, weathered material, so we always take the old sealant out. Where a wall is exposed, as many are in small places like Ashmansworth, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- A sealant colour to suit the surroundings
- Any old sealant cut out fully, not covered over
- Rated 4.9 stars on Google
- 20+ years of sealant experience