Expansion joint sealing in Crosspost
Expansion and movement joint sealing in walls, decks and floors in Crosspost and across West Sussex. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Water dripping through deck or ramp joints
- Rain penetration at brick or block movement joints
- Sealant peeling off one face of the joint
Expansion joint sealing near Crosspost
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Questions we’re asked in Crosspost
Will you take on work at estates like Crosspot Industrial Estate, close to Crosspost?
Yes. Our area takes in Crosspost and its surroundings, with estates and business parks such as Crosspot Industrial Estate included. To start, just phone 01277 525 020 or send photos by email with the unit, the joints involved and your access times.
Can you take on a job at a hospital such as The Dene Hospital?
Yes. We work in healthcare settings as well as offices and schools. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.
Do your applicators hold CSCS cards?
Yes. Our applicators hold CSCS cards, which many sites require.
What guarantee do you give on joint sealing?
It’s backed by our 12-month guarantee. Tell us straight away if a joint we sealed gives trouble in that time.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Can staff carry on working while you are here?
Typically, yes. We phase the work so most of the building stays in use, with each area protected and signed.
Is colour matching possible?
That depends on the product specified. Some ranges are wide, others limited, so we’ll confirm the colours available for the specified product with the quote.
How we handle expansion joint sealing in Crosspost
Joints in car park decks and ramps are among the hardest-working in any building. Tyres load the edges, and de-icing salts and water work into any gap. A sealant suited to traffic and the expected movement goes in, phasing bays so the car park can stay in use. If you have damp inside where a wall movement joint has failed and sealant peeling off one face of the joint, we can put it right. Whoever orders the work in Crosspost, the brief is typically the same: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
In and around smaller places like Crosspost, the concrete floors we see are often in converted farm buildings, small workshops and storage units. Whether it’s a farm store turned workshop or a storage unit, the joints need a product that suits the traffic.
Every job we finish is backed by a 12-month workmanship guarantee. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Location
- Crosspost (RH17)
- Region
- West Sussex
- Guarantee
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Places near Crosspost
More services for Crosspost
Maintenance after handover
Cleaning and maintenance staff play a part too. Pass these on to them:
- Record the sealant used and the date in the O&M file
- Reopen bays and walkways only after the stated cure time
- Plan racking layouts so feet don’t land on a joint
- Include every elevation and deck joint in periodic inspections
Keep wheels, feet and water off new joints until the sealant has cured. How long that takes depends on the product, the temperature and the depth of the joint and we will tell you when each bay or area can reopen. Keeping the area coned off until then avoids tyre marks and damage.
A failed deck joint lets water straight through to the level below. That water often carries de-icing salts with it and it can affect the structure over time. Resealing early limits the damage.
Doing it in-house
Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
Some joints are best left to specialists: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong normally costs more in the end than doing them right.
Leave it or put it right?
Sealing over a failed movement joint is a common shortcut. A bead over the old seal can’t bond or flex, so it fails quickly. Full removal and preparation is in every quote. For buildings around smaller places like Crosspost, water damage can go unnoticed for longer, especially where a building isn’t used daily, so a failed joint can leak for a while before anyone sees it. Renewing joints in good time avoids the problem.
The product called for affects the cost, as does the preparation each joint needs, such as cutting out, priming or new backing rod. Access, phasing and site rules also count.
Why us?
- Sealing commercial buildings since 2005
- Public liability insurance in place
- Work carried out by CSCS-carded applicators
- CHAS accredited
Read what affects the cost and our accreditations.
Floors, slabs and movement joints in Crosspost
Less than 3 miles from Crosspost there are at least three named estates and business parks. That puts plenty of warehouse floors, service yards and car parks close by, all with joints under traffic. Rainfall across the South East, Crosspost included, is lower than in many parts of the UK. External slab and deck joints still need a dry, clean joint to seal, while winter salting gets into any joint left open.
Across sites such as Ricebridge Industrial Estate, which lies south-east of Crosspost, floor and movement joints can be sealed in phases so units keep working. Large sites such as The Dene Hospital (2.5 miles south-east of Crosspost) have car parks, service roads and long elevations with movement joints in brick and panels. Schools like Bolney CofE Primary School often have long brick elevations with movement joints that age quietly.
Crosspost is about 4 miles north-west of Burgess Hill, in West Sussex. We cover Crosspost and the rest of West Sussex, with the same fixed quotes and 12-month guarantee as everywhere else. Crosspost is one of 373 places in West Sussex on our list. Sites around Brighton have their own page, about 11 miles away.
Postcode districts covered here: RH17. Streets here include Cowfold Road and Chapel Road. Sites close to Crosspost are covered too, including Bolney (1 mile north-east), Twineham Green (1 mile south), Twineham (2 miles south), Wineham (2 miles south-west) and Kent Street (2 miles west). Nearby towns on our patch include Crawley (9 miles north), Horsham (7 miles north-west), Worthing (14 miles south-west), Haywards Heath (5 miles east), Burgess Hill (4 miles south-east) and East Grinstead (13 miles north-east).
Near you in Crosspost
The closest station to Crosspost is Wivelsfield station, roughly 4.2 miles east of the centre. A little further out are The Dene Hospital (2.5 miles south-east) and Cuckfield Museum (3.2 miles north-east). Not far away are Blunts Wood and Paiges Meadow.
Our process
We bring the products specified for the job, along with primers and backing rod. Any old material is cut back to clean, sound faces, primer goes on where the manufacturer specifies it, and each bead is tooled to a neat concave finish. Jobs in and around smaller places like Crosspost are normally planned as a single visit, so photos and measurements up front really help. Then the right materials arrive with us.
- Photos, joint lengths and drawings come to us, or we visit.
- We compare each joint’s width with the movement and the sealant’s capability and tell you if the design looks wrong for the movement.
- Old sealant and debris are cut out of every joint.
- Any broken arrises or friable edges are flagged before work goes further.
- The right sealant goes in at the right depth, bonded to the two sides only.
- Areas reopen once cured, and the work carries our 12-month guarantee.
Before we start on site
- Arrange parking or a loading space
- Send any specification or drawings in advance
- Warn occupants and staff about the work
Ask for a quote
For a fixed quote, call 01277 525 020 or send details through our quote form. Our quote form is another easy route.
Read more
Different surfaces, different methods
Car park decks and ramps
Water coming through deck joints is the usual first sign. We strip the old seal, prepare the edges and seal again, and we will tell you if any edges need repairing first.
Brickwork and blockwork joints
Brick and block edges need careful preparation. We clean them back to sound material and prime where the manufacturer specifies, then seal and tool the joint.
What sets the cost
The price varies from site to site. It mainly depends on:
- Whether the work must be split into stages
- Induction, permit and paperwork requirements
- How accessible the joints are
- Joint width, depth and condition
Every site prices differently: joint size, product, access and site hours all play a part. A fixed quote follows once we understand the job.
Before you send an enquiry
It doesn’t need to be a full survey. A few details are enough to get going:
- Your programme or deadline
- Whether an asbestos survey exists
- Whether the building will be occupied during the work
- Anything awkward about access or site hours
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to give us a call on 01277 525 020 or use the quote form with what you know.