Hampshire · England
Clayhall External Mastic
Movement joints in Clayhall need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Cracked joints where brick meets render or frames
- Sealant pulling away from one side of the joint
- Rain getting behind render or cladding at a joint
Common problems we fix in Clayhall
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Signs it’s time to call us include:
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
- Cracked joints where brick meets render or frames
- Rain getting behind render or cladding at a joint
If you live in an older home near St Francis, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What to look for in a quote
- Which colour the sealant will be
- How long to leave it before use
- Is the old sealant removed completely?
- Which sealant they’ll use, and why
External mastic in Clayhall
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 joint doesn’t stand out. Common call-outs are for gaps where render, brick and frames meet and hard, crazed mastic that has stopped moving, across joints between brick and frames, brickwork movement joints and render & cladding joints.
Homes around Clayhall range from older cottages to newer houses, with walls and rooflines of every type. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Where
- Clayhall (PO12)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Clayhall
More services for Clayhall
What affects the quote in Clayhall
There’s no set price list. The quote depends on:
- The product the joint needs
- When we can work, for business premises
- Whether there’s mould to deal with
- How many rooms, windows or areas are involved
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The address or postcode of the job
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
- The rough size of the job
If you’re in Clayhall and need external mastic, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
FAQs for Clayhall
I let a flat near Portsmouth Harbour station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners. You can phone 0345 464 0079 or email us with the details for a clear quote.
Does the coastal weather in Clayhall affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Do you work at height?
That depends on the building and the joints. Where joints can be reached safely, we will do them. Give us some details and we’ll confirm the access.
How long before the joint can be used?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Can you seal over the old sealant?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
Can you seal joints between two different materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints, and we clear up when we are done.
What we do, step by step
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself usually takes anything from a few hours to several days, depending on the building, depending on the size of the job. In a smaller place like Clayhall, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- 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
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
- Keep children and pets away from the work area
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, ring 0345 464 0079 or send us an email.
Related advice
When something else is needed
Before booking, it’s worth knowing the limits:
- Cracked brickwork or render that needs a builder or plasterer
- Loose or hollow render, which needs re-rendering
- Structural movement, which needs a surveyor or engineer
If you are not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Concrete & block
- Brickwork movement joints
Clayhall buildings and the weather
Clayhall 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Portsmouth Harbour station, split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Haselworth Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Clayhall is about 2 miles south-east of Gosport, in Hampshire. From the centre of Clayhall to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Clayhall is one of 683 places in Hampshire where we work.
We work across the PO12 postcode area for external mastic and the streets around it. You’ll find streets such as The Lane, Old Road and Fort Road. If you are just outside Clayhall, we cover Haslar (1 mile south-east), Alverstoke (1 mile west), Portsmouth Point (1 mile north-east), Privett (1 mile north-west) and Portsea (2 miles north-east). Within a short drive, we also cover Havant (8 miles north-east), Fareham (6 miles north-west), Horndean (10 miles north-east), Hedge End (12 miles north-west), Waterlooville (8 miles north-east) and Purbrook (7 miles north-east).
Near you in Clayhall
Typical jobs here are in homes near Bay House School, The Fighting Cocks pub and St Vincent College, among other places. The closest station to Clayhall is Portsmouth Harbour station, about 1.4 miles north-east. Well-known places in the area include Gosport War Memorial Hospital (1 mile north-west) and Search (0.9 miles north). Not far away are West of the River Alver.
What the job involves on each surface
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one.
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. We reseal them with a sealant suited to the panel material.
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Leave the joints unpainted unless we’ve said otherwise
- Get split or bare joints resealed while the damage is small
- Clear growth from the base of walls and joints
- Avoid pressure-washing directly into sealant joints
Keep pressure washers away from the sealant. High-pressure water can lift the edges and let water in behind.
Once a joint can’t move, the wall finds another way, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Work for landlords, hotels and businesses
Landlords and agents in Clayhall can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.