West Sussex · England
Rock Window Mastic
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Rock. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Cracked or shrunken mastic around the frame
- Rain getting in at the frame or under the sill
- Gaps between the frame and the inside reveal
Window mastic for homes and businesses in Rock
Frames and walls don’t move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. Common call-outs are for mastic that has split away from the wall and old mastic that has gone black or come away, across aluminium frames, window sills and timber windows & doors.
Around Rock, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Each job carries a 12-month guarantee, large or small.
- Place
- Rock (RH20)
- Region
- West Sussex
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. Around Rock, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start.
Why choose Mr Mastic in Rock
- Arbo and Everbuild products
- We’re fully insured
- Every job guaranteed for a year
- ARBOMaster approved applicator
Read what affects the cost and what customers say.
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Check the mastic once a year
- Avoid blasting the frames with a pressure washer
- Avoid harsh chemicals near the mastic
- Don’t paint over the silicone
Have a look at the joints once a year, ideally after winter. Small splits are simple to catch before they leak.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. A new joint closes it up.
Common questions in Rock
Can you do window mastic in Rock?
Yes. We work across London and the South East, and Rock is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Do you cover smaller places like Rock?
Yes, Rock is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can new sealant go over the old?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Will new mastic stop draughts?
It will if the frame joint is the problem. We find where the air is coming from before we reseal.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
How do I get a quote for window mastic in Rock?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
I’m a tenant. Can you help?
We are happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Will it make a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
What else we do in Rock
What sealant work cannot fix
Before you book, it’s worth knowing the limits:
- Worn gaskets, brush seals or a door that has dropped
- A frame that has rotted at the joint
- Condensation trapped between the panes
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before booking.
Where we work in Rock
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Composite doors
- Window sills
Windows and doors in Rock
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 Parham House (about 3.9 miles west) are a reminder that the area around Rock has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
In the older streets around The Parish Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as St Mary's CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Rock is about 6 miles north of Worthing, in West Sussex. We carry out window mastic for homes and businesses in Rock and the surrounding area. Rock is one of 371 places in West Sussex we cover for window mastic. For nearby work, see our Brighton page.
All of RH20 is within our area for window mastic, from the main roads to the quietest streets. Whether your property is on Old London Road, London Road and Lamorna Close or a nearby road, our applicators can take on the job. Other places close to Rock include Washington (1 mile south), Heath Common (1 mile north-west), Sullington (1 mile west), Warminghurst (2 miles north) and Storrington (2 miles west). Larger places within reach include Horsham (11 miles north), Worthing (6 miles south), Bognor Regis (15 miles south-west), Haywards Heath (15 miles north-east), Burgess Hill (12 miles east) and Littlehampton (9 miles south-west).
Landmarks near Rock
In Rock, that means homes and buildings near Rydon Community College and The Frankland Arms Public House and the streets around them. A little further out are The Storrington And District Museum (1.9 miles west). Open spaces near Rock include Chanctonbury Hill.
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured for the work.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
What the job involves on each surface
Aluminium frames
Aluminium needs a sealant that bonds to coated metal and we avoid acetoxy silicones, which can react with some metals. We use a neutral-cure product.
Composite doors
A composite door generally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
What happens on the day
There’s no need to move everything out, just the space around the work. Everything nearby is protected, and the job takes most of a day for a typical house, less for a few frames for a typical job. In a small place like Rock, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Mention any sign-in or site rules at work premises
- Plan for the work area to be out of bounds to pets and children
- Mention if the joints have been sealed before
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Related advice
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
A DIY attempt does not rule out a professional job. We cut it out and start again.