Hampshire · England
Sand Mastic in Forton
We cover Forton for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Wind and rain getting in round a sash window
- A silicone bead on a sash window that spoils the look
- Gaps where the frame meets the masonry
Sand mastic in Forton
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties, where modern sealant can look out of place. If you have mastic worn away on windows facing the weather and gaps between timber frames and stone or brick, we can help.
Houses in smaller places like Forton can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Forton (PO12, PO13)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Stone surrounds
The stone is treated with care when the old mastic comes out.
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is normally favoured.
Forton questions
Can you help a landlord with a rental near Portsmouth Harbour station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Is sand mastic in a coastal place like Forton any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will advise.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
How long does sand mastic take to go off?
Not straight away. The skin forms first, and the full set comes later and we’ll give you an idea for your job.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Do you come to Forton?
Yes. We work in Forton. To book, ring 0345 464 0079 or drop us an email.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Decayed frames that need repair
- Broken panes
- Decisions on consent for listed homes
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Stone surrounds
- Timber door frames
- Brick reveals
- Tenement windows
- Period & listed homes
- Sash and case windows
Frames and glazing around Forton
Forton is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around St John the Evangelist, the joint between an old wall and a newer frame is normally the first place rain gets in. If you look after a building such as St Mary's Catholic Primary School, its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Portsmouth Harbour station? Then any sash windows need sound mastic to keep draughts and rain out.
Forton is about 1 mile south-east of Gosport, in Hampshire. For sand mastic in and around Forton, please phone 0345 464 0079 or drop us an email for a quick quote. We are based in Crawley and cover Hampshire, Forton included. Our area takes in 683 places across Hampshire, from the larger towns to small villages.
Work in PO12 and PO13 is quoted and booked the same way as anywhere else. Whether your property is on Lee Road, Ford Road and Lees Lane or a nearby road, our applicators can take on the job. Other places close to Forton include Gosport (1 mile north-west), Priddy's Hard (1 mile north-east), Elson (1 mile north), Bridgemary (2 miles north-west) and Rowner (2 miles north-west). Larger places within reach include Havant (8 miles north-east), Eastleigh (15 miles north-west), Fareham (4 miles north-west), Horndean (9 miles north-east), Hedge End (11 miles north-west) and Waterlooville (7 miles north-east).
Around Forton
Typical jobs here are in homes near The Trafalgar pub, Brune Park Community School and St Vincent College. The nearest railway station is Portsmouth Harbour station, roughly 1.5 miles east. A little further out are Portchester Castle (2.8 miles north-east) and Gosport War Memorial Hospital (0.6 miles south-west). Open spaces near Forton include West of the River Alver and Portsdown Hill.
The process
When we arrive, we look over the joints with you first. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a single window, longer for several. For a job in Forton, 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 each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Tell us about any water getting in
- Tell us if parking is tricky
- Clear items away from the joints we are working on
Get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved and give you a clear price.
Advice
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Some sealant jobs are within reach of a careful DIYer, 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.
What affects the cost of sand mastic
There’s no set price list, because no two jobs are the same. What we look at:
- Any working-time requirements on site
- The old material and how stubborn it is
- Any mould that needs treating
- The amount of work
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- How many joints, rooms or windows are involved
- If someone has resealed it before
- Whether it’s a home or a business
- Where the property is
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, phone 0345 464 0079 or drop us an email.
Why act early in Forton
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new mastic stays put. In an older home around Forton, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Why book with us
- We never seal over old sealant
- Domestic, commercial and hotel work
- Every job guaranteed for a year
- Arbo and Everbuild products
Read how sealant jobs are priced and customer reviews.