West Sussex · England
Hassocks External Mastic
Professional external mastic in and around Hassocks, with old sealant always removed completely and a 12-month guarantee.
- Old sealant gone brittle and cracked
- Joints pointed up with cement by mistake
- Movement joints with cracked, split or missing sealant
External mastic for homes and businesses in Hassocks
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall. We work on render & cladding joints, concrete & block and façade panels, and the jobs we see most are plants rooting in failed movement joints and failed sealant between panels on a façade.
In a smaller place like Hassocks, some homes face open ground, and walls and rooflines facing the weather take the worst of it. That’s where gutter joints and wall joints tend to fail first.
There’s a 12-month guarantee on every job.
- Where
- Hassocks (BN6)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out and protects the render itself.
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on the amount of work. For a job in Hassocks, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Move anything stored near the joints
- On commercial sites, let us know about site rules
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you are ready, call 0345 464 0079 or send us an email.
Read more
Towns and villages near Hassocks
Other services in Hassocks
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Why it’s worth doing now in Hassocks
Running new sealant over the old bead rarely lasts. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. Homes in smaller places like Hassocks can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why choose Mr Mastic in Hassocks
- Anti-fungal sanitary silicone in wet areas
- We agree the colour with you first
- Tidy, careful work
- 20+ years of sealant experience
Take a look at how sealant jobs are priced or what customers say.
Quotes for external mastic in Hassocks
Your quote is based on your job. We look at:
- The product the joint needs
- The number of rooms or windows
- When we can work, for business premises
- How much there is to do
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start.
Helping us quote
There’s no need for technical detail. Just tell us:
- The address or postcode of the job
- Photos by email, if that is easy
- If someone has resealed it before
- How many joints, rooms or windows are involved
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
FAQs for Hassocks
Is Hassocks within the area you cover?
Yes, Hassocks is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you do external mastic in Hassocks?
Yes, Hassocks is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
How long will you be here?
Typically it takes a few hours to a few days, depending on the length of joint and the access. Larger jobs naturally take longer, and we’ll tell you how long to expect.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Is it messy?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Landlords, agents and businesses in Hassocks
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Aftercare tips
A little care helps the new joints last. We recommend:
- Check the sealant is paintable before painting near it
- Avoid pressure-washing directly into sealant joints
- Deal with leaking gutters that soak the joints below
- Keep movement joints as flexible joints, not mortar
Do not paint over the new sealant unless we have said the product is paintable. Many exterior sealants aren’t designed to be painted, and paint can crack as the joint moves.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
External mastic in Hassocks: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Hassocks Infant School? Then its movement joints, gutters and trims need looking after like any other building’s. Letting a property close to Hassocks station? Then split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as St Francis of Assisi, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Hassocks is about 2 miles south of Burgess Hill, in West Sussex. Jobs in Hassocks get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 371 places across West Sussex. We also work in Brighton, about 7 miles from Hassocks.
Postcode districts we cover here for external mastic: BN6. That includes homes and businesses on London Road, Semley Road and Farm Close and the roads around them. Nearby, we also carry out external mastic in Keymer (1 mile east), Hurst Wickham (1 mile north-west), Clayton (1 mile south), Hurstpierpoint (1 mile north-west) and Ditchling (1 mile east). Further out, we also cover Crawley (13 miles north), Horsham (12 miles north-west), Worthing (13 miles south-west), Haywards Heath (5 miles north-east), East Grinstead (15 miles north-east) and Shoreham-by-Sea (8 miles south-west).
Landmarks near Hassocks
Typical jobs here are in homes near Downlands Community School and The Hassocks pub. Hassocks has its own railway station: Hassocks station. Other landmarks nearby include The Budding Foundation Museum of Gardening (within half a mile south-west) and Clayton Castle (1.2 miles south). Green spaces nearby include Bedelands Farm Nature Reserve and Wolstonbury Hill.