Hampshire · England
Stroud External Mastic
Problem with your movement joints in Stroud? We cut out the old, prepare the joints and apply the right sealant.
- Weeds or debris growing in open joints
- Gaps where render, brick and frames meet
- Weathered mastic that no longer stretches
About our external mastic in Stroud
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We work on render & cladding joints, copings & trims and façade panels, and people most often call us about panel joints letting water in and gaps where render, brick and frames meet.
Outside joints can only be sealed when they’re dry, so work in Stroud is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Stroud (GU32)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in Stroud
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
The process
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to several days, depending on the building. Somewhere as small as Stroud, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Clear the area around the work
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
Advice
Common problems we fix in Stroud
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
The most common problems we see are:
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
- Sealant that has lost its bond to the brick or render
- Moss and dirt in joints with no sealant left
For an older house near a landmark such as Stroud Mission Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Comparing quotes
- What happens if they find a problem under the old sealant
- How the joint is cleaned and prepared
- What product goes in the joint
- What the cure time is
What external mastic looks like in Stroud
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Petersfield station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as Langrish Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Stroud is about 2 miles west of Petersfield, in Hampshire. Wherever you are in the GU32 postcode area, our applicators can take on external mastic. Stroud is one of 683 places in Hampshire where we work for external mastic. Portsmouth is on our list too, about 15 miles from Stroud.
We work across the GU32 postcode area for external mastic. Whether your property is on Winchester Road, Stroudfields and Ramsdean Road or a nearby road, we can help. We also cover the places around Stroud: Langrish (1 mile west), Petersfield (2 miles east), Froxfield Green (2 miles north-west), Steep (2 miles north-east) and High Cross (2 miles north). Further out, we also cover Winchester (15 miles west), Havant (10 miles south), Fareham (15 miles south-west), Horndean (7 miles south), Alton (10 miles north) and Waterlooville (9 miles south).
Landmarks near Stroud
Locally, jobs take us to homes and businesses close to The Petersfield School, Morton House School and Seven Stars pub. For rail, the closest station is Petersfield station, roughly 1.3 miles east. Other landmarks nearby include Petersfield Community Hospital (1.3 miles east) and Clanfield Earthwork (4.2 miles south). Open spaces near Stroud include Liss Riverside Railway Walk South and Pidham Hill.
DIY versus a professional finish
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Quotes for external mastic in Stroud
There’s no set price list, because jobs vary so much. What we look at:
- The amount of work
- Whether old sealant or filler has to be cut out
- The type of sealant required
- Access and height
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
What to tell us for a quote
When you contact us, these details help:
- A few photos by email, if you can
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you are ready, phone 0345 464 0079 or drop us an email.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Keep soil, plants and ivy away from the joints
- Deal with leaking gutters that soak the joints below
- Make sure movement joints aren’t pointed over
- Check the sealant is paintable before painting near it
Do not paint over the new sealant unless we’ve said the product is paintable. 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.
Your questions about external mastic in Stroud
Will you come out to Stroud?
Yes, Stroud is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you do external mastic in Stroud?
Yes, Stroud is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Do you work for letting agents?
Yes, regularly. We can quote for several properties at once.
Can you reach joints on upper floors?
Each building is different. Tell us the height, the number of joints and what’s below them.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose, and the wall may crack nearby. A flexible sealant is the right fill.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Where is Mr Mastic based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Also near Stroud
Also in Stroud
When it is not the sealant
To be straight with you, some problems need a different trade:
- Subsidence or other structural problems
- Adding movement joints to masonry that has none
- Damp that isn’t coming from the joint
If in doubt, call 0345 464 0079 or send us an email and we will say what we think before booking.
What we seal
- Façade panels
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
- Concrete & block