Crosspost mastic sealing
Commercial sealant work in Crosspost for contractors, FMs and building owners: mastic sealing for building owners, managing agents and housing associations, with a fixed quote first.
- The same joint failures repeated across a portfolio
- Cracked, hardened mastic round windows on a block
- Communal area joints that look neglected
Mastic sealing for businesses in Crosspost
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Common problems we fix in Crosspost
In communal areas, joints take knocks from bins, bikes, buggies and deliveries, and low-level joints get damaged. Cleaning products add to the wear.
What tends to prompt an enquiry:
- Damp patches beside frames
- The same joint failures repeated across a portfolio
- Failed external movement joints
- Repeated reactive repairs to the same buildings
For a school such as Bolney CofE Primary School, perimeter mastic on windows and doors is a holiday job.
Questions to ask before you book
- How they handle RAMS and site documents
- Their public liability cover
- Whether old or failed sealant will be cut out, not overlaid
- Can the work be phased to keep areas open?
About our mastic sealing in Crosspost
Blocks are lived in, so access and disruption have to be thought through. Dates, areas and the order of work are agreed with you in advance so you can let residents know what is happening. Communal entrances and stairs stay usable while we work. We work on shopfronts below residential blocks, balcony and threshold joints and communal kitchens and washrooms, and what we’re called in for most is water getting in round frames after rain and old repairs sealed over failed mastic. Most enquiries from Crosspost start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.
Around smaller places like Crosspost, older walls fitted with newer windows are a familiar sight. The mastic needs to suit an irregular masonry face and the look of the building.
Building owners and contractors get the same cover: a 12-month guarantee on our workmanship. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.
- Location
- Crosspost (RH17)
- Wider area
- West Sussex
- Cover
- A 12-month guarantee
- Price
- A fixed quote before we start
- Phone
- 01277 525 020
- Updated
- 3 November 2026
FAQs: Crosspost
Is Crosspost too far out for you?
Not at all: smaller places are covered as well as towns. We work across Greater London and the South East. Good photographs up front let us bring everything on the first visit.
Will you take on a block within reach of Wivelsfield station?
Yes, and several blocks can go on one quote. Give us the building’s details and say how residents are notified, and we will quote and plan to suit.
How long will the new sealant last?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Sealant joints are maintenance items, so inspect them regularly.
Can you follow the specification on our project?
Yes. Include it with the drawings when you ask for a quote, and the quote will be based on it, flagging anything that needs clarifying.
Do you check for asbestos in old sealant?
In older buildings, old mastic can contain asbestos. We check the asbestos register or survey before disturbing it and suspect material is tested first.
How many days will you need on site?
It depends on the scope, though a typical visit usually takes a day or two for a single block, longer for an estate programme. Larger or phased jobs take longer, and we’ll give you a timescale with the quote.
Do you seal on top of existing sealant?
No, never. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.
Why it’s worth doing now in Crosspost
Mixed repairs by different contractors leave a patchwork of products and colours. A block-wide reseal gives one product, one colour and one guarantee. Around Crosspost, it’s better to renew all the failing joints at once. Send photos of each area and we’ll quote for the lot.
There’s no price list, since every building and every scope is different. For a fixed figure, call for a quote and we’ll price your job on its own details.
What you get with us
- Matching to RAL references, product permitting
- 12 months’ guarantee on every job
- Joints cleaned back to sound surfaces
- A Constructionline member, so easy to vet
Read what affects the cost and how we’re accredited.
For owners and agents in Crosspost
The South East is one of the drier parts of the UK. Even so, frame mastic only goes on in dry, workable conditions, and the sunniest, most exposed sides of a building typically need attention first. Central London is about 36 miles from Crosspost. Commuter-belt towns tend to have plenty of managed blocks near stations and town centres.
If you are responsible for a building such as St Mary Magdalene's Church, frame and door mastic needs the same attention as any other property. For owners of several units at places like Crosspot Industrial Estate (less than half a mile south of Crosspost), one programme can deal with frame and external mastic across the lot.
Crosspost is about 4 miles north-west of Burgess Hill, in West Sussex. Businesses, contractors and managing agents in Crosspost can call on us for mastic joints. 373 places across West Sussex fall within our area, including Crosspost. We also cover Brighton, around 11 miles from Crosspost.
Work on mastic joints is covered throughout RH17. Among the streets we cover are Cowfold Road and Chapel Road. Just outside Crosspost, we also work in 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). Bigger towns within reach 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).
Local landmarks in Crosspost
For rail, the closest station is Wivelsfield station, roughly 4.2 miles east of the centre. Other landmarks nearby include The Dene Hospital (2.5 miles south-east) and Cuckfield Museum (3.2 miles north-east). Open spaces near Crosspost include Blunts Wood and Paiges Meadow.
What we can’t put right
Not every problem is a sealant problem, and we’re upfront when that’s the case. These need a different solution:
- Failed window or door frames, which need a window contractor
- Materials that need asbestos testing before work
- Roof leaks, gutters or failed flashings that aren’t sealant joints
If in doubt, give us a call on 01277 525 020 or use the quote form and we’ll say what we think.
Surfaces we seal
- Balcony and threshold joints
- Communal kitchens and washrooms
- Shopfronts below residential blocks
- Communal entrances and stairwells
- Window and door perimeters on blocks
- External wall and movement joints
Different surfaces, different methods
Planned maintenance
Adding mastic to planned maintenance avoids reactive repairs and spreads the work.
Tenement and older buildings
Older mastic can contain asbestos and the register is checked before anything is disturbed. Suspect material is tested before work continues.
Diagnose, treat, sign off
On arrival, we report to your site contact and complete whatever induction the building runs. Floors, finishes and fittings next to the joints are covered before anything is cut or cleaned, and the work usually takes a few days for most blocks, with larger programmes scheduled building by building. For work around Crosspost, we aim to finish in one visit, so photos and measurements up front really help. That way the right products come on the day.
- A building-by-building inspection lists the failed joints.
- You get a fixed quote, per block or for the whole programme.
- Dates and areas are agreed so occupiers can be told.
- Failed sealant is removed and the faces prepared.
- Joints are resealed and tooled.
- Each building is checked and signed off with the 12-month guarantee.
What we need from you
- Tell us which areas need to stay in use
- Tell us your opening times and when work is allowed
- Point out parking and an unloading spot
Quotes
Photos, drawings or a schedule of the joints and a fixed quote comes back to you. Where a site visit makes more sense, we’ll arrange one.
Related advice
Cost factors for mastic joints
What shapes the price:
- The total length or number of joints
- Any access equipment needed
- Travel to remote or island sites
- Whether old sealant has to be cut out first
The work involved drives the cost: stripping out, preparation, sealing, access and phasing. Call for a fixed quote and we will explain how it’s made up.
Before you send an enquiry
A good diagnosis starts with the right details. Tell us:
- Any specification or named product
- Your programme or deadline
- A wide shot and a close-up of the area
- Whether the building will be occupied during the work
Need a figure for a tender or a budget? We’ll quote against your scope and drawings that you can work with. If you have questions first, ring 01277 525 020 or send details through our quote form.