West Sussex · England
Sand mastic for sash & case windows in Furnace Wood, West Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Furnace Wood and across West Sussex. Fully insured, ARBOMaster approved and guaranteed for a year.
- Draughts and rain around sash boxes
- Open joints round the window box
- Cement or filler used on old window joints that has cracked
Sand mastic in Furnace Wood
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. We work on tenement windows, brick reveals and timber door frames, and the jobs we see most are cracked mastic round a front door frame and draughts and rain around sash boxes.
Mastic can only go onto a dry, clean joint, so window work in Furnace Wood is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Furnace Wood (RH19)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
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.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Towns and villages near Furnace Wood
Other services in Furnace Wood
The process
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it generally takes a few hours per window, depending on the condition of the joints. For a village or hamlet like Furnace Wood, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Move anything stored near the joints
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
Ask for a quote
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or drop us an email and describe the job and send pictures if you have them.
Read more
Windows and doors in Furnace Wood
With historic houses such as Saint Hill Manor (about 3 miles south-east) nearby, there’s older building stock in the area around Furnace Wood as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Felbridge Primary School, the mastic around its windows and doors needs looking after like any other building’s. Historic houses such as Saint Hill Manor, about 3 miles south-east, show how far back building around Furnace Wood goes, and older homes nearby need a sealant that suits their walls. For landlords with property near East Grinstead station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Furnace Wood is about 3 miles west of East Grinstead, in West Sussex. Jobs in Furnace Wood get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across West Sussex, we cover 371 places, Furnace Wood among them. We also work in Crawley, about 6 miles from Furnace Wood.
Postcode districts we cover here for sand mastic: RH19. You will find streets such as Lake View Road, Felcot Road and Furnace Farm Road, all of which we cover. Other places close to Furnace Wood include Domewood (1 mile north-west), Snow Hill (1 mile west), Felbridge (1 mile east), Crawley Down (1 mile south) and Newchapel (2 miles north-east). Within a short drive, we also cover Crawley (6 miles west), Horsham (12 miles south-west), Haywards Heath (10 miles south), Burgess Hill (13 miles south), East Grinstead (3 miles east) and Broadfield (7 miles south-west).
Near you in Furnace Wood
Around Furnace Wood, our work takes us to homes and buildings near Imberhorne School, among other places. Furnace Wood’s nearest station is East Grinstead station, roughly 2.5 miles south-east of the centre. A little further out are Effingham Park Motor Museum (0.9 miles west) and Queen Victoria Hospital (3.1 miles east). Green spaces nearby include Hedgecourt Lake.
What happens if it’s left?
If you are redecorating, renew the mastic first. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. Where a wall is exposed, as many are in small places like Furnace Wood, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Why us?
- Quality sealants from Arbo and Everbuild
- ARBOMaster approved applicator
- Fully insured
- Domestic, commercial and hotel work
Take a look at how sealant jobs are priced or our reviews.
How the job changes by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we will confirm access.
Furnace Wood: your questions answered
Do you work for landlords with property near East Grinstead station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can be quoted together. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Is Furnace Wood 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.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Where is Mr Mastic based?
We are based in Crawley, West Sussex, and we work across South East England, London and Scotland.
How long will you be here?
As a guide, most jobs take anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer, and we’ll say how long yours will take.
Can sand mastic be painted?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Get any rot dealt with first
- Look over the window mastic once a year
- Find out about consent before window work on a listed home
- Go gently near the mastic when preparing windows
Do not touch or press the mastic while it hardens. It skins over quickly but needs longer to fully harden.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
Landlords, agents and businesses in Furnace Wood
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Letting agents and landlords in Furnace Wood can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Broken panes
- Damaged stone surrounds
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before booking.
Surfaces we seal
- Timber door frames
- Stone surrounds
- Sash and case windows
- Tenement windows
- Period & listed homes
- Brick reveals