Hampshire · England
Romsey External Mastic
External mastic in Romsey from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Failed sealant between panels on a façade
- Weeds or debris growing in open joints
- Cracked joints where brick meets render or frames
Questions from Romsey
Do you cover Romsey for external mastic?
Yes, Romsey is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
Is there a guarantee on external mastic in Romsey?
All our work, in Romsey and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
How do you reach high-level joints?
It depends on the height and the site. Ground-floor joints are simple; for higher work, tell us about the building and we will confirm what’s needed.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
When will the joints need doing again?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Every job carries our 12-month guarantee.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
What information do you need?
Just the basics: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or drop us an email.
About our external mastic in Romsey
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. If you’re dealing with rain getting behind render or cladding at a joint and panel joints letting water in, we can help, on concrete & block, render & cladding joints and joints between brick and frames alike.
Romsey mixes older houses and their gutters with newer estates of brick, render and uPVC trims. Gutter joints, fascia trims and the movement joints in newer brickwork all need sealant that can flex.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Romsey (SO51)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for external mastic
You’ll get a clear quote before any work starts. It’s based on:
- Any mould that needs treating
- Working hours on commercial sites
- Whether the work is at height
- The number and length of the joints
Doing several joints on one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
What we need to know
To make quoting easier, please include:
- Access, such as stairs, a lift or height
- A few photos by email, if you can
- The type of property
- The address or postcode of the job
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or drop us an email.
Also in Romsey
For landlords and businesses
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together, and we’re fully insured.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Do you need external mastic in Romsey?
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
The problems people usually mention when they call are:
- Water getting into walls through failed joints
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
- Rigid filler in a joint that should flex
Schools such as Romsey Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- Whether they’re fully insured
- How much experience the applicator has
- Whether all the old sealant comes out first
- How the colour is chosen
How the job changes by surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
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.
What we do, step by step
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes anything from a few hours to several days, depending on the building, depending on the amount of work. Parking in a town like Romsey is usually straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- 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
- Clear the area around the work
- Mention any tricky access
- Mention any parking rules near the property
How to get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved and give you a clear quote.
Related advice
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
How to look after the new joints
So the new joints stay in good condition:
- Walk round the building once a year and look at the joints
- Ask before painting over external sealant
- Get split or bare joints resealed while the damage is small
- Avoid pressure-washing directly into sealant joints
Do not paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants are not designed to be painted and spoil the finish.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Walls and rooflines in Romsey
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Mottisfont Abbey (about 4 miles north-west) nearby, there’s older building stock in the area around Romsey as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Letting a property close to Romsey station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to St Swithun's Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Romsey is about 6 miles west of Eastleigh, in Hampshire. If you need external mastic in Romsey, it’s easy to get a quote: please call 0345 464 0079 or email us. We’re based in Crawley and cover Hampshire, Romsey included. Our Hampshire coverage runs to 683 places, Romsey among them. There’s also a page for Southampton, about 6 miles away.
All of SO51 is covered for external mastic. Whether your property is on Station Road, Corn Market and Ashley Meadows or anywhere close by, our applicators can take on the job. Being close to the A27 and A3057, Romsey is simple for us to get to. We also cover North Baddesley (2 miles south-east), Toothill (2 miles south), Ashfield (2 miles south), Lee (2 miles south) and Upton (3 miles south). Larger places within reach include Winchester (8 miles north-east), Eastleigh (6 miles east), Andover (15 miles north), Totton (5 miles south), Chandler's Ford (4 miles east) and Hedge End (9 miles south-east).
Landmarks near Romsey
Typical jobs here are in homes near The Mountbatten School, Bishop Blaize Public House and The Romsey School, among other places. The closest station to Romsey is Romsey station, about 0.5 miles west. Nearby you will also find Romsey Community Hospital (within half a mile south) and King Johns House (0.8 miles west). Green spaces nearby include Emer Bog and Baddesley Common.