Isle of Wight · England
External & façade joints in Merstone, Isle of Wight
Professional external mastic in and around Merstone, with old sealant always removed completely.
- Movement joints filled with mortar instead of sealant
- Weeds or debris growing in open joints
- Old sealant gone brittle and cracked
External mastic in Merstone
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing, and we don’t skip that step. Common call-outs are for brick movement joints where the sealant has split and movement joints filled with mortar instead of sealant, on copings & trims, render & cladding joints and concrete & block.
In a village or hamlet like Merstone, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
All of our work is guaranteed for twelve months.
- Place
- Merstone (PO30)
- Region
- Isle of Wight
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
- Don’t let climbing plants root in the sealant
- Check external joints each spring
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Small splits are the time to act. At that stage it’s a simple cut out and reseal before water has had years to get in.
When something else is needed
Sealant is not the answer to every problem, and we’d rather say so up front. It won’t solve:
- Cracking across the wall rather than at a joint
- Loose or hollow render, which needs re-rendering
- Movement that’s more than a sealant joint can take
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Surfaces we seal
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Copings & trims
Towns and villages near Merstone
More services for Merstone
Do you need external mastic in Merstone?
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Keep an eye out for these signs:
- Joints pointed up with cement by mistake
- Joints with sealant missing in places
- Failed seals between different materials
- Sealant pulling away from one side of the joint
Historic houses such as Arreton Manor, about 1.1 miles north, show how far back building around Merstone goes.
Before booking anyone
- Whether all the old sealant comes out first
- The length of the guarantee
- Whether the sealant suits the joint
- Are they insured?
Landlords, agents and businesses in Merstone
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Should I try it myself first?
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.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Outside joints around Merstone
With historic houses such as Arreton Manor (about 1.1 miles north) nearby, there’s older building stock in the area around Merstone as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. 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.
If you let a flat or house near Shanklin station, outside joints that have cracked can let damp into a rental, so check them between lets.
Merstone is about 3 miles south-east of Newport, in the Isle of Wight. For external mastic in and around Merstone, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover the Isle of Wight from our Crawley base. 125 places in the Isle of Wight are on our list, large and small. For nearby work, see our Portsmouth page, about 13 miles away.
Here we cover the PO30 postcode area for external mastic. Local streets include Merstone Lane, Chapel Lane and Newlands, and we cover them all. We also cover the places around Merstone: Arreton (1 mile north-east), Rookley (1 mile south-west), Hale Common (1 mile south-east), Rookley Green (1 mile south-west) and Blackwater (2 miles north-west). Larger places within reach include Newport (3 miles north-west), Ryde (6 miles north-east), Cowes (7 miles north), Sandown (4 miles east), Shanklin (4 miles south-east) and Ventnor (5 miles south-east). Island and remote addresses take a little more planning, so please mention your location when you ring 0345 464 0079 or drop us an email.
Local landmarks in Merstone
The nearest railway station is Shanklin station, about 3.8 miles south-east of the centre. Nearby you’ll also find Whitecroft Hospital (2.2 miles west) and Carisbrooke Castle (3.1 miles north-west). Not far away are Stenbury Down and Alverstone Mead.
What happens on the day
There isn’t much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes anything from a few hours to several days, depending on the building. Somewhere as small as Merstone, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
- Try not to wet indoor joints just before the visit
Ask for a quote
Want a quote for external mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
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Quotes for external mastic in Merstone
Call for a quick quote. What matters most is:
- When we can work, for business premises
- Mould in or behind the old joints
- The old material and how stubborn it is
- 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 send you a clear quote before any work starts.
Asking for a quote
To help us quote quickly, let us know:
- How we’d reach the joints
- Any previous sealing or DIY work
- Roughly how big the job is
- A few photos by email, if you can
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Questions from Merstone
Can you help a landlord with a rental near Shanklin station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Do you cover smaller places like Merstone?
Yes, Merstone is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
What information do you need?
The location, the problem and the rough size of the job. Photos by email help too.
Can new sealant go over the old?
No, and we never do. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Can you seal joints between render and window frames?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
Do you have insurance?
Yes. Full insurance covers our work.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Merstone.