Southampton · England
External & façade joints in Shirley, Southampton
Problem with your movement joints in Shirley? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Joints with sealant missing in places
- Sealant that has lost its bond to the brick or render
- Moss and dirt in joints with no sealant left
External mastic in Shirley, done properly
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We strip the joint back and start again. We work on concrete & block, joints between brick and frames and copings & trims, and the jobs we see most are plants rooting in failed movement joints and gaps where render, brick and frames meet.
Houses in smaller places like Shirley can stand more in the open than those in a built-up town, and walls and rooflines facing the weather take the worst of it. That’s where gutter joints and wall joints tend to fail first.
All our work is covered by a 12-month guarantee, wherever you are in Southampton.
- Place
- Shirley (SO15, SO16, SO17)
- Region
- Southampton
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Landlord and commercial work in Shirley
We work for landlords and agents as well as householders. Sealant work between tenants keeps a property looking cared for.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Places near Shirley
More services for Shirley
Questions from Shirley
Do you cover smaller places like Shirley?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Does living near the coast affect external mastic in Shirley?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you.
Where are you based?
Mr Mastic is based in Crawley. We cover Shirley and the rest of Southampton.
When will the joints need doing again?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
How long does external mastic take?
A typical job takes a few hours for a handful of joints, longer for a whole elevation, including the preparation. We’ll confirm how long when we quote.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
What happens if it’s left?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. In an older home around Shirley, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What you get with us
- Experience in homes, commercial sites and hotels
- Sealant colour chosen to suit
- 180+ five-star Google reviews
- White, clear, grey or coloured to suit, where the product allows
Read our cost guide or our reviews.
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on the building, and the area is left clean. Parking around Shirley is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Mention any tricky access
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Advice
What affects the cost of external mastic
Call for a quick quote. What matters most is:
- The product the joint needs
- The size of the job
- The old material and how stubborn it is
- Any mould that needs treating
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts.
What to tell us for a quote
You don’t need to know the technical terms. Just tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- The type of property
- Pictures of the joints, sent by email
Every job is quoted individually. Simply phone 0345 464 0079 or drop us an email and describe the job.
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Avoid pressure-washing directly into sealant joints
- Check the sealant is paintable before painting near it
- Keep movement joints as flexible joints, not mortar
- Tell anyone working on the walls about the movement joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
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.
External mastic in Shirley: local notes
Shirley is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. 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.
For landlords with property near Millbrook (Hants) station, split movement joints are easy to miss on a rental until damp shows inside. Homes close to Shirley Parish Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. Managing a site like Wordsworth Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Shirley is about 2 miles west of Southampton, in Southampton. We provide external mastic to householders, landlords and businesses in Shirley and the surrounding area. Across Southampton, we cover 40 places, and Shirley is one of them.
Here we cover the SO15, SO16 and SO17 postcode area for external mastic. That includes homes and businesses on May Road, Dyer Road and York Road. With the A3057 close by, Shirley is simple for us to get to for external mastic. Other places close to Shirley include Regents Park (1 mile west), Freemantle (1 mile south), Millbrook (1 mile south-west), Coxford (1 mile north-west) and Maybush (1 mile north-west). Within a short drive, we also cover Townhill Park (3 miles east), Midanbury (3 miles east), Thornhill (4 miles east), Chartwell Green (4 miles east), Harefield (4 miles east) and Itchen (3 miles south-east). Shirley is among the bigger towns we cover in Southampton.
Near you in Shirley
Around Shirley, our work takes us to homes and buildings near The Crown Public House, St James' Park and Regents Park Community College. Shirley’s nearest station is Millbrook (Hants) station, about 0.7 miles south. Nearby you’ll also find Netley Castle (4.4 miles south-east) and Foresters Museum & Archive (1 mile south-east). For a walk, there’s Testwood Lakes.
Different surfaces, different methods
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it so the sealant is not too deep.