West Sussex · England
Gay Street External Mastic
Problem with your movement joints in Gay Street? We cut out the old, prepare the joints and apply the right sealant.
- Panel joints letting water in
- Rigid filler in a joint that should flex
- Water getting into walls through failed joints
External mastic in Gay Street
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two. Typical jobs include rain getting behind render or cladding at a joint and movement joints with cracked, split or missing sealant, on joints between brick and frames, render & cladding joints and brickwork movement joints.
Around Gay Street, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
Big or small, you get the same one-year guarantee in Gay Street and across West Sussex.
- Where
- Gay Street (RH20)
- Region
- West Sussex
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Signs you need external mastic in Gay Street
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Signs it’s time to call us include:
- Brick movement joints where the sealant has split
- Panel joints letting water in
- Joints where the bead has come unstuck
- Moss and dirt in joints with no sealant left
Rented homes near Pulborough station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- Who turns up on the day
- What the quote includes, VAT included or not
- What happens if the job turns out different
- Which colour the sealant will be
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost, so the problem grows beyond the joint itself. Where a wall is exposed, as many are in small places like Gay Street, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Combining jobs into one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Why Gay Street clients choose us
- Over 20 years’ experience
- Any old sealant cut out fully, not covered over
- Rated 4.9 stars on Google
- Quality sealants from Arbo and Everbuild
Read what affects the cost and our reviews.
Places near Gay Street
Other services in Gay Street
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Keep movement joints as flexible joints, not mortar
- Tell anyone working on the walls about the movement joints
- Get split or bare joints resealed while the damage is small
- Avoid pressure-washing directly into sealant joints
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Gay Street questions
Can you do external mastic in Gay Street?
Yes. We work across London and the South East, and Gay Street is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Is Gay Street within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
Are you fully insured?
Yes, we are fully insured.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back, so the joint can move.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme.
Do you remove the old sealant?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
What information do you need?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply phone 0345 464 0079 or drop us an email.
Gay Street buildings and 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. Historic houses like Old Place Manor (about 2.4 miles south-west) are a reminder that the area around Gay Street has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Historic houses such as Old Place Manor, about 2.4 miles south-west, show how far back building around Gay Street goes.
Gay Street is about 9 miles south-west of Horsham, in West Sussex. Homes, rented property, offices and hotels in Gay Street can book us for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Across West Sussex, we cover 371 places, Gay Street among them. There’s also a page for Crawley, roughly 15 miles from Gay Street.
We cover every part of the RH20 postcode area for external mastic and the streets around it. Other places close to Gay Street include North Heath (1 mile north-west), Nutbourne (1 mile south), Broomershill (1 mile south-west), West Chiltington (2 miles south) and Codmore Hill (2 miles west). Larger places within reach include Crawley (15 miles north-east), Horsham (9 miles north-east), Worthing (11 miles south), Burgess Hill (15 miles east), Littlehampton (12 miles south) and Shoreham-by-Sea (13 miles south-east).
Landmarks near Gay Street
For rail, the closest station is Pulborough station, roughly 2.7 miles south-west. Not far away are The Mens.
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Cracked brickwork or render that needs a builder or plasterer
- Damp that is not coming from the joint
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
How it works
At the end, we look at the finished work together and explain the cure time. The visit itself usually takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. Somewhere as small as Gay Street, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
Getting a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.
Advice
What affects the quote in Gay Street
Jobs vary more than people expect. What affects the quote:
- How many areas need sealing
- Any mould that needs treating
- Any working-time requirements on site
- The product the joint needs
The cost depends on the amount of work, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- What’s wrong with the joints now
- The type of property
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
If you are in Gay Street and need external mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.