Furnace Green mastic sealing
Mastic sealing for Furnace Green, from a contractor working since 2005. Fully insured and CHAS accredited.
- The same joint failures repeated across a portfolio
- Cracked, hardened mastic round windows on a block
- Old repairs sealed over failed mastic
Mastic sealing across Furnace Green
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
How we handle mastic sealing in Furnace Green
Mastic Doctor has sealed joints on commercial and residential blocks since 2005. Every applicator holds a CSCS card, and the work is backed by public liability insurance. Resealed mastic joints in Furnace Green carry our 12-month guarantee. Most enquiries involve draughts at frames across a block and damaged joints in communal entrances and corridors, on communal kitchens and washrooms, balcony and threshold joints and external wall and movement joints. For commercial sealant work in Furnace Green, you deal with one contact from quote to sign-off, whether it’s one building or several.
Owners with buildings around smaller places like Furnace Green often group mastic work so one visit covers several properties. Send the addresses and photographs and we’ll quote for all of them together.
We sign every job off with a 12-month guarantee. It’s a plain promise: if the work we did fails within twelve months, we return to fix it.
- Location
- Furnace Green (RH10)
- Region
- West Sussex
- Cover
- 12 months on every job
- Quote
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Updated
- 3 November 2026
Keeping the joints sound
Your facilities or cleaning team can help the joints last. Share these points with them:
- Check sealant joints during planned building inspections
- Reduce knocks to communal area joints
- Prioritise elevations facing the weather
- Plan resealing building by building rather than complaint by complaint
Where a paintable product was specified, it can be painted after curing. Non-paintable silicone shouldn’t be painted over unless told otherwise.
Planned resealing is easier to budget than emergency repairs. We can quote buildings in priority order and work down the list.
Cost factors for mastic joints
To price the job, we consider:
- Induction, permit and paperwork requirements
- Any access equipment needed
- The size and state of each joint
- Distance, for remote addresses
Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Mention the access as part of your enquiry.
What to include in your enquiry
We can often quote from photographs and a few details. Please tell us:
- Access details, including height
- What the building is and how it’s used
- A wide shot and a close-up of the area
- The site address and postcode
The quickest route to a quote is a few photos and the site postcode. Send them through the quote form, or give us a call on 01277 525 020 or email a schedule or drawings if you’d rather talk the job through.
Different surfaces, different methods
Window and door perimeters on blocks
On most blocks, the frame-to-wall joint is where failure shows first. We remove the failed mastic, prepare the faces, add backing rod if the joint is deep and reseal.
External movement joints
Failed sealant is removed, backing rod inserted to control depth and the joint resealed with a grade whose movement class fits.
Places near Furnace Green
What else we do in Furnace Green
Common problems we fix in Furnace Green
Many failed joints were sealed without backing rod, so the mastic is glued to the joint bottom too. It can’t stretch properly and splits as the building moves.
Look out for the following:
- The same joint failures repeated across a portfolio
- Repeated reactive repairs to the same buildings
- Movement joints with sealant missing
- A mix of products and colours from past repairs
Churches, halls and community buildings such as St Andrew's Church are looked after by trustees and committees like any other owner, and their frames, doors and external joints need mastic renewed in time.
Before you book anyone
- Are they CHAS accredited or on Constructionline?
- How the existing material will be dealt with
- Can the work be phased to keep areas open?
- What level of public liability insurance do they hold?
Mastic sealing around Furnace Green: points for this area
Rainfall across the South East, Furnace Green included, is lower than in many parts of the UK. Even so, frame mastic only goes on in dry, workable conditions, and the sunniest, most exposed sides of a building normally need attention first. Furnace Green has three care or nursing homes no more than 2 miles away. For owners and operators of care buildings, window perimeters and external joints are best renewed in planned phases around residents.
For agents with blocks near Three Bridges station, 1.2 miles north of Furnace Green, a block-wide mastic programme deals with frames, balconies and entrances in one go. For a school such as Brook Infant School, perimeter mastic on windows and doors is a holiday job.
Furnace Green is about 2 miles south-east of Crawley, in West Sussex. We cover Furnace Green, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. Furnace Green is one of 373 places we cover in West Sussex for mastic joints. We also cover Brighton, around 18 miles from Furnace Green.
If you need mastic sealing in RH10, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. For a building on Marion Road, Holder Road and Bolton Road or nearby, we can quote for mastic joints. Nearby places we also cover include 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) for mastic joints. Nearby towns on our patch include 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).
Around Furnace Green
Locally, jobs take us to sites close to Oriel High School, The Charcoal Burner pub and Tilgate Park, among other places. The nearest railway station is Three Bridges station, roughly 1.2 miles north. Other landmarks nearby include Crawley Museum (1.8 miles north-west) and Crawley Hospital (2 miles north-west). For a walk, there’s Tilgate Lake.
Your questions answered
Is a smaller place like Furnace Green outside your area?
Not at all: smaller places are covered as well as towns. We cover Greater London and the counties of the South East. We plan jobs in smaller places so return trips are kept to a minimum.
Do you cover business parks and estates near Furnace Green, such as Maidenbower Business Park?
Yes, sites like Maidenbower Business Park are within our area, along with the rest of Furnace Green. Photos and a short description are enough for a first look.
Do you need to see the site first?
That depends on the size and complexity of the job. Simple work can often be priced from photos, and bigger or more complex jobs normally get a visit.
How do you reach windows on upper floors?
It depends on the building. We agree access with you at quote stage so the fixed quote reflects it.
Is mastic sealing guaranteed?
Our workmanship carries a 12-month guarantee and we hold public liability insurance.
What do you charge?
There isn’t a price list, as every site differs. With photographs or drawings, we can give you a fixed quote.
Which sealant will you use?
Where there’s a specification, we use the product it names. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.
For managing agents and facilities managers
Whether you are a managing agent, a property factor or an owner’s representative: send the details, accept a fixed quote, and we carry out and guarantee the work. Keys, access and contacts can be agreed in advance.
If you look after buildings for someone else, clear figures and clear communication matter. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative, plus a 12-month guarantee.
On site: what to expect
When we get to site, we sign in, go through any site induction and check how permits are handled. Floors, finishes and fittings next to the joints are covered before any cutting starts, and the work normally takes a day or two for a single block, longer for an estate programme. For a site in Furnace Green, we plan so the whole job is done in one go where possible. Photos with rough sizes let us arrive with everything needed.
- We check the asbestos register for older buildings and look at the joints.
- A fixed quote covers the joints, products and order of work.
- Failed mastic is removed completely.
- Joint faces are cleaned, backed and resealed.
- We finish each building before moving to the next.
Preparing the site
- Move anything stored against the joints
- Tell us your opening times and when work is allowed
- Point out any areas we must not close
Request a quote
Send us photos, drawings or a joint schedule are often enough for a fixed quote. Where a site visit makes more sense, we’ll arrange one.