Greater London · England
Sand mastic for sash & case windows in Rise Park, Greater London
Professional sand mastic in and around Rise Park, with every bit of old sealant taken out first and a one-year guarantee.
- Mastic worn away on windows facing the weather
- Silicone on a period window that looks wrong
- Open joints round the window box
Sand mastic in Rise Park
Silicone on a period window often looks wrong and doesn’t suit the building. Sand mastic is the traditional choice, and we can replace one with the other. If you are dealing with old sand mastic that has cracked, crumbled or fallen out and wind and rain getting in round a sash window, we can help, on tenement windows, stone surrounds and sash and case windows alike.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
Big or small, you get the same 12-month guarantee.
- Where
- Rise Park (RM1, RM5, RM2)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Brick reveals
Loose mastic comes out and deep gaps are packed before the new mastic goes in.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
FAQs for Rise Park
I let a flat near Gidea Park station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Is parking a problem for a job in Rise Park?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Is consent needed for window work on a listed home?
Checking first is sensible. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
When will the new mastic be hard?
Not right away. The skin forms first, and the full set comes later, and we’ll tell you what to expect.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme.
What happens if it’s left?
New mastic over crumbling mastic will not hold. We remove the loose material first so the new work lasts. In a flat in Rise Park, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why us?
- Homes, businesses and hotels
- Rated 4.9 stars on Google
- Tidy, careful work
- 20+ years of sealant experience
Should I try it myself first?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
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.
Honest limits
Before you book, it’s worth knowing the limits:
- Damaged stone surrounds
- Broken panes
- Timber that has rotted
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Brick reveals
- Tenement windows
- Period & listed homes
- Stone surrounds
- Timber door frames
- Sash and case windows
Common problems we fix in Rise Park
Paint, silicone or cement used over old mastic causes problems. They do not move with the timber, and they normally need raking out.
The problems people usually mention when they call are:
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
Letting a property close to Gidea Park station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Comparing quotes
- Which colour the sealant will be
- Whether they’re fully insured
- Whether the sealant suits the joint
- How much experience the applicator has
Aftercare tips
So the new joints stay in good condition:
- Don’t paint over the new mastic
- Look over the window mastic once a year
- Ask a joiner to look at soft timber first
- Don’t run silicone over sand mastic
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
What happens on the day
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Rise Park. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Mention if the joints have been sealed before
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
Getting a quote
Need a quote? Please call 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear price before any work starts.
Related advice
Also near Rise Park
Also in Rise Park
Frames and glazing around Rise Park
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
For an older house near a landmark such as St James, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Rise Park can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Rise Park is about 1 mile north of Romford, in Greater London. Every kind of property in Rise Park is covered for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. Across Greater London, we cover 764 places, and Rise Park is one of them. There’s also a page for London, roughly 14 miles from Rise Park.
Here we cover the RM1, RM5 and RM2 postcode area for sand mastic. Whether your property is on Brook Road, Havering Road and Heather Avenue or a nearby road, our applicators can take on the job. We also cover the places around Rise Park: Collier Row (1 mile south-west), Romford (1 mile south), Marks Gate (2 miles west), Rush Green (2 miles south) and Chadwell Heath (2 miles south-west). Further out, we also cover London (14 miles south-west), Marylebone (15 miles west), St Pancras (14 miles west), Shoreditch (12 miles south-west), Walthamstow (9 miles west) and Hoxton (12 miles west).
Around Rise Park
We work in homes and buildings around The Ship Public House, Raphael Park and Marshalls Park Academy and the streets around them. The closest station to Rise Park is Gidea Park station, about 1.4 miles south-east of the centre. Other landmarks nearby include Harold Wood Hospital (1.8 miles east) and Upminster Tithe Barn Museum of Nostalgia (3.7 miles south-east). Green spaces nearby include Bedfords Park.