West Sussex · England
Window Mastic in Furnace Green
Professional window mastic in and around Furnace Green, with every bit of old sealant taken out first and a 12-month guarantee.
- Cold air getting in at the frame edge
- Mastic that is falling out in pieces
- Cracked or shrunken mastic around the frame
Window mastic for homes and businesses in Furnace Green
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty. Where the air is getting in through the window itself, we’ll say so. Typical jobs include cracked sealant at the sill ends and mastic that’s falling out in pieces, across uPVC windows, patio & French doors and window sills.
In smaller places like Furnace Green, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
All our work comes with a one-year guarantee.
- Location
- Furnace Green (RH10)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
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.
Landlord and commercial work in Furnace Green
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Honest limits
To be straight with you, there are a few things sealant won’t fix:
- A frame that has rotted at the joint
- Damp coming through the wall itself rather than the frame joint
- A sash or casement that will not close properly
If in doubt, ring 0345 464 0079 or email us and we will say what we think before you book.
Surfaces we seal
- uPVC windows
- Composite doors
- Patio & French doors
- Window sills
- Timber windows & doors
- Aluminium frames
How it works
We keep the work tidy and contained to the joints we are treating, so you can carry on as normal. Expect the work to take anything from an hour or two to a full day, depending on how many frames there are, and we explain the cure time before we leave. For a job in Furnace Green, 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 check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Advice
What happens if it’s left?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. In a smaller place like Furnace Green, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
The cost depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts.
Why Furnace Green clients choose us
- Fully insured
- A choice of colours where the product allows
- Colour agreed with you before any work starts
- Every job guaranteed for a year
Take a look at what affects the cost or customer reviews.
When to call us in Furnace Green
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
People normally contact us after spotting something like this:
- Black, perished sealant on frames
- Cracked sealant at the sill ends
- Draughts coming in around windows and doors
- Damp patches on the reveal after heavy rain
For site and facilities teams at buildings such as Brook Infant School, its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- How the joint is cleaned and prepared
- The length of the guarantee
- Whether they seal over old material or remove it
- How the colour is chosen
Windows and doors in Furnace Green
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. Crawley, which Furnace Green is part of, is one of England’s post-war new towns. With many homes from the post-war decades, replacement windows and doors are common. That mastic ages as well, and sills and frame heads are where leaks start.
If you live in an older home near St Andrew's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Three Bridges station, renewing tired window mastic between tenants heads off draught and damp complaints.
Furnace Green is about 2 miles south-east of Crawley, in West Sussex. From the centre of Furnace Green to the outskirts, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Furnace Green is one of 371 towns and villages in West Sussex we cover for window mastic.
Jobs for window mastic in RH10 is quoted and booked the same way as anywhere else. Streets in the area include Marion Road, Holder Road and Bolton Road. We also cover the places around Furnace Green: 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). We also work in nearby towns such as 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).
Near you in Furnace Green
Typical jobs here are in homes near Oriel High School, The Charcoal Burner pub and Tilgate Park and the streets around them. For rail, the closest station is Three Bridges station, roughly 1.2 miles north. A little further out are Crawley Museum (1.8 miles north-west) and Crawley Hospital (2 miles north-west). The countryside around Furnace Green includes Tilgate Lake.
Furnace Green: your questions answered
Should the sealant in an older Furnace Green home be renewed?
Often, yes: cracked, shrunken or mouldy sealant has done its job. The key is cutting all the old sealant out, as new sealant won’t bond to it.
I let a flat near Three Bridges station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Can you quote for more than one area?
Of course. Doing several areas at once is usually more efficient, so mention them when you ask for a quote.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses.
How do I get a quote for window mastic in Furnace Green?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used.
Do you come to Furnace Green?
Yes, we do. Our applicators work in Furnace Green.
Aftercare tips
To keep the joints looking good and working properly:
- Keep paint off silicone joints
- Clean frames with a soft cloth and soapy water
- Ventilate rooms so frames don’t stay wet inside
- Look round the frames every year or so
Have a look at the joints once a year, ideally after winter. Small splits are simple to catch before they leak.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.