West Sussex · England
Selsfield Common External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Selsfield Common, with a 12-month guarantee on every job. Call for a quick quote.
- Failed sealant between panels on a façade
- Hard, crazed mastic that has stopped moving
- Rain getting behind render or cladding at a joint
External mastic in Selsfield Common
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. We work on joints between brick and frames, copings & trims and render & cladding joints, and people most often call us about failed seals between different materials and weathered mastic that no longer stretches.
Outside joints can only be sealed when they’re dry, so work in Selsfield Common is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
All of our work is guaranteed for twelve months, in Selsfield Common and everywhere else we cover.
- Where
- Selsfield Common (RH19)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
When it is not the sealant
Sealant isn’t the answer to every problem, and we will tell you before work begins. It will not solve:
- Loose or hollow render, which needs re-rendering
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cutting new joints into brickwork, which is building work rather than sealant work
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in Selsfield Common
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Copings & trims
- Render & cladding joints
Places near Selsfield Common
What else we do in Selsfield Common
What we do, step by step
On the day, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before work begins. The work usually takes anything from a few hours to several days, depending on the building. Somewhere as small as Selsfield Common, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Read more
How the job changes by surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best in all weathers.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Act on the first splits you see
- Deal with leaking gutters that soak the joints below
- Ask before painting over external sealant
- Show decorators and builders where the movement joints are
Have a quick look at the joints each spring. 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 with no damage behind it to deal with.
Why it’s worth doing now in Selsfield Common
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, rather than the wall around it. Around Selsfield Common, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why choose Mr Mastic in Selsfield Common
- Sanitary silicone with an anti-fungal additive in wet areas
- Domestic, commercial and hotel work
- Over 20 years’ experience
- A sealant colour to suit the surroundings
Take a look at what affects the cost and our reviews.
What we’re called out for in Selsfield Common
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.
Signs it’s time to call us include:
- Joints with sealant missing in places
- Moss and dirt in joints with no sealant left
- Leaking joints around cladding and façade panels
- Sealant pulling away from one side of the joint
For site and facilities teams at buildings such as Turners Hill CofE Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- How much experience the applicator has
- What guarantee comes with the work
- Are they insured?
- Whether you can choose the colour
Selsfield Common: your questions answered
Do you work for landlords with property near East Grinstead station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Can you do external mastic in Selsfield Common?
Yes, Selsfield Common is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear quote.
Do you take out the old sealant first?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Where are you based?
We work from Crawley. Our applicators cover Selsfield Common.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint cannot move, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
Walls and rooflines in Selsfield Common
With historic houses such as Gravetye Manor (about 0.8 miles east) nearby, there’s older building stock in the area around Selsfield Common as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near East Grinstead station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Church of St Leonard include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Selsfield Common is about 4 miles south-west of East Grinstead, in West Sussex. Across the RH19 area, we cover external mastic for homes and businesses. Selsfield Common is one of 371 places in West Sussex we cover.
Postcode districts we cover here for external mastic: RH19. Selsfield Common is on the B2028, which makes it straightforward to reach with everything needed for external mastic. Other places close to Selsfield Common include West Hoathly (1 mile south-east), Sharpthorne (2 miles south-east), Little London (2 miles south), Highbrook (3 miles south) and Ardingly (3 miles south). We also work in nearby towns such as Crawley (5 miles west), Horsham (11 miles west), Haywards Heath (6 miles south), Burgess Hill (10 miles south), East Grinstead (4 miles north-east) and Broadfield (6 miles west).
Local landmarks in Selsfield Common
We work in homes and buildings around The Crown Public House, among other places. For rail, the closest station is East Grinstead station, about 3.5 miles north-east of the centre. Well-known places in the area include Queen Victoria Hospital (4.5 miles north-east) and Waterbury Castle (4 miles south-east). Not far away are Hedgecourt Lake.