West Sussex · England
Furnace Green External Mastic
We cover Furnace Green for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Sealant that has lost its bond to the brick or render
- Joints with sealant missing in places
- Weathered mastic that no longer stretches
External mastic for homes and businesses in Furnace Green
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. We work on render & cladding joints, joints between brick and frames and copings & trims, and common reasons people get in touch are joints where the bead has come unstuck and movement joints with cracked, split or missing sealant.
Houses in smaller places like Furnace Green can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are generally the first to go.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Furnace Green (RH10)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
All our tools and materials come with us in the van. Once we have agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. A visit to Furnace Green is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
- Let us know about parking restrictions
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved before giving you a price.
Related advice
What external mastic looks like in Furnace Green
With historic houses such as Tyes Place (about 4.3 miles south) nearby, there’s older building stock in the area around Furnace Green 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to St Andrew's Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. Managing a site like Brook Infant School? Then larger buildings have long runs of movement joint that eventually need resealing.
Furnace Green is about 2 miles south-east of Crawley, in West Sussex. Homes, rented property, offices and hotels in Furnace Green is covered for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. 371 places in West Sussex are on our list, from the larger towns to small villages.
Every address in RH10 is covered for external mastic, from the main roads to the quietest streets. Local streets include Marion Road, Holder Road and Bolton Road, and we cover them all. If you are just outside Furnace Green, we cover Pease Pottage (2 miles south-west), Worth Abbey (2 miles east), Balcombe Lane (2 miles south-east), Balcombe (3 miles south-east) and Staplefield (4 miles south). Further out, we also cover Horsham (7 miles west), Haywards Heath (7 miles south), Burgess Hill (10 miles south), East Grinstead (7 miles east), Billingshurst (14 miles south-west) and Bewbush (3 miles west).
Landmarks near Furnace Green
Around Furnace Green, our work takes us to homes and buildings near Oriel High School, The Charcoal Burner pub and Tilgate Park, among other places. The closest station to Furnace Green is Three Bridges station, about 1.2 miles north of the centre. A little further out are Crawley Museum (1.8 miles north-west) and Crawley Hospital (2 miles north-west). Not far away are Tilgate Lake.
Do you need external mastic in Furnace Green?
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
It’s worth asking for a quote if you see:
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
- Failed sealant between panels on a façade
- Joints where the bead has come unstuck
For landlords with property near Three Bridges station, outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
- How long the guarantee is
- Which colour the sealant will be
Landlord and commercial work in Furnace Green
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
If you manage several properties in or around Furnace Green, several properties can be quoted together. Just tell us the addresses and what each one needs.
What affects the quote in Furnace Green
For a quick quote, just ask. The main things that affect it are:
- Whether there’s mould to deal with
- The type of sealant required
- How many areas need sealing
- The old material and how stubborn it is
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Where the job is, and your postcode
- The rough size of the job
- Pictures of the joints, sent by email
- If it’s domestic, commercial or a hotel
For external mastic in Furnace Green, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
Why deal with it now?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last, so it pays to do it properly once. In an older home around Furnace Green, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
Doing several joints on one visit generally makes better use of the time than several visits. You’ll get one clear quote for the whole job.
Why choose Mr Mastic in Furnace Green
- Quality sealants from Arbo and Everbuild
- Anti-fungal sanitary silicone in wet areas
- Every job guaranteed for a year
- Experience in homes, commercial sites and hotels
What the job involves on each surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it so the sealant is not too deep.
Towns and villages near Furnace Green
More services for Furnace Green
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Common questions in Furnace Green
Can you help a landlord with a rental near Three Bridges station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Is Furnace Green within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint.
Is there a guarantee?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
Can you reach joints on upper floors?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
When will the joints need doing again?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Are you fully insured?
Yes. We are fully insured for every job we do.
How long does the job take?
Typically it takes anything from a few hours to several days, depending on the building. Larger jobs naturally take longer.