Hampshire · England
External Mastic in Rowlands Castle
Problem with your movement joints in Rowlands Castle? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Rigid filler in a joint that should flex
- Brick movement joints where the sealant has split
- Joints where the bead has come unstuck
About our external mastic in Rowlands Castle
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. We work on façade panels, brickwork movement joints and concrete & block, and people most often call us about gaps where render, brick and frames meet and old sealant gone brittle and cracked.
In and around Rowlands Castle, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Rowlands Castle (PO9)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Rowlands Castle
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
People generally contact us when they notice one of these:
- Brick movement joints where the sealant has split
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
- Failed seals between different materials
For landlords with property near Rowlands Castle station, split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- Whether they’re fully insured
- Is the old sealant removed completely?
- What happens if the job turns out different
- How the joint is cleaned and prepared
Also near Rowlands Castle
Also in Rowlands Castle
Walls and rooflines in Rowlands Castle
Rowlands Castle is close to 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. With historic houses such as Warblington Castle (about 3 miles south) nearby, there’s older building stock in the area around Rowlands Castle as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Schools such as Havant Academy are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. In the older streets around The Church on the Green, an extension built onto an older house moves differently, and the joint between them takes the strain.
Rowlands Castle is about 2 miles north-east of Havant, in Hampshire. Homes, rented property, offices and hotels in Rowlands Castle can book us for external mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 683 places across Hampshire, from the larger towns to small villages. You can also see our page for Portsmouth, about 7 miles away.
Here we cover the PO9 postcode area for external mastic. We cover properties on Stansted Close, College Close and Redhill Road. Neighbouring places we cover for external mastic include Durrants (1 mile south), Leigh Park (2 miles south-west), Havant (2 miles south-west), Denvilles (2 miles south) and Westbourne (2 miles south-east). Within a short drive, we also cover Gosport (10 miles south-west), Fareham (10 miles west), Hedge End (15 miles west), Waterlooville (3 miles west), Petersfield (8 miles north) and Purbrook (3 miles south-west).
Local landmarks in Rowlands Castle
Locally, jobs take us to homes and businesses close to Robin Hood Inn. Rowlands Castle has its own railway station: Rowlands Castle station. Well-known places in the area include Havant War Memorial Hospital (2.6 miles south-west) and Havant Museum (2.7 miles south). For a walk, there’s Compton Down and Brook Meadow (Emsworth).
Why deal with it now?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. In a smaller place like Rowlands Castle, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
What you get with us
- White, clear, grey or coloured to suit, where the product allows
- Colour agreed with you before any work starts
- An ARBOMaster approved applicator
- Fully insured
Read our cost guide or customer reviews.
How we quote for external mastic
We do not publish a price list, because jobs vary so much. What we look at:
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
- The type of sealant required
- Any working-time requirements on site
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Helping us quote
To make quoting easier, let us know:
- Pictures of the joints, sent by email
- The problem you’ve noticed
- Where the job is, and your postcode
- The type of property
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
How it works
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a job in Rowlands Castle, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Mention any tricky access
- Let us know if you’ve seen damp or leaks
- Let us know about parking restrictions
Get a quote
There’s no standard price list. Instead, we give you a clear quote for your job. To get started, phone 0345 464 0079 or email us.
Read more
Your questions about external mastic in Rowlands Castle
Do you work for landlords with property near Rowlands Castle station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you cover smaller places like Rowlands Castle?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How long will you be here?
That depends on how much there is to do, but most jobs take anything from a few hours to several days, depending on the building. We’ll give you a better idea when we quote.
Where do you work from?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Do you use backing rod?
That is backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
Do the sealants smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Are you insured?
Yes. We’re fully insured.
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Letting agents and landlords in Rowlands Castle can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Deal with leaking gutters that soak the joints below
- Look over the joints every year, ideally after winter
- Do not let climbing plants root in the sealant
- Leave the joints unpainted unless we have said otherwise
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
When something else is needed
To be straight with you, there are a few things sealant will not fix:
- Render that’s blown, hollow or coming away
- Cracks in the bricks or render themselves, away from the joints
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Rowlands Castle
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Concrete & block
- Joints between brick and frames
- Copings & trims