Windsor and Maidenhead · England
Frogmill Sand Mastic
We cover Frogmill for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Old cement repairs round a window that have failed
- Old sand mastic that has cracked, crumbled or fallen out
- A silicone bead on a sash window that spoils the look
How we handle sand mastic in Frogmill
Traditional burnt sand mastic blends with stone and brick surrounds. It suits period and listed homes where a modern sealant bead would stand out. Typical jobs include crumbling sand mastic round a window and patchy fillers round a sash window, across timber door frames, sash and case windows and stone surrounds.
Homes in small places like Frogmill often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Whatever the size of the job, you get the same one-year guarantee.
- Where
- Frogmill (SL6)
- Wider area
- Windsor and Maidenhead
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in Frogmill
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
When something else is needed
New sealant can’t fix everything, and we will tell you before work begins. Sealant will not put right:
- Broken panes
- Rotten sashes, sills or window boxes (a joiner’s job)
- Whether work needs listed building consent
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before you book.
What we seal
- Timber door frames
- Tenement windows
- Stone surrounds
- Brick reveals
- Period & listed homes
- Sash and case windows
Do you need sand mastic in Frogmill?
Timber swells and shrinks with the weather. The movement cracks the mastic little by little.
People usually contact us after spotting something like this:
- Old sand mastic that has cracked, crumbled or fallen out
- Tired mastic found when preparing windows for paint
- Silicone on a period window that looks wrong
- Gaps where the frame meets the masonry
In the older streets around Church of St Peter and St Paul, the joint between an old wall and a newer frame is generally the first place rain gets in.
What to look for in a quote
- What product goes in the joint
- Which colour the sealant will be
- Whether VAT is included
- What preparation is included
Frogmill questions
Can you do sand mastic in Frogmill?
Yes, Frogmill is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Henley-On-Thames station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
What information do you need?
Let us know what needs doing and where, with photos by email if possible. We’ll ask anything else we need to know.
When will the new mastic be hard?
It skins over fairly quickly but takes longer to harden fully. We will tell you what to expect for your job.
Do you guarantee sand mastic work?
Every job comes with our 12-month guarantee.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Places near Frogmill
Other services in Frogmill
Looking after it afterwards
A little care helps the new joints last. We recommend:
- Sort the mastic before the decorators arrive
- Don’t paint over the new mastic
- Take care around the mastic when scraping paint
- Check with your local planning authority if your home is listed
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
The process
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before we start. Most jobs take a few hours per window, depending on the condition of the joints. In a small place like Frogmill, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- Mention if the joints have been sealed before
Ask for a quote
We do not publish a price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Advice
Quotes for sand mastic in Frogmill
Some jobs are bigger than they look, and some smaller. The main factors:
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- The type of sealant required
- Mould in or behind the old joints
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email and we’ll talk you through it.
What we need to know
To help us quote quickly, please include:
- Pictures of the joints, sent by email
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- Roughly how big the job is
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs 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. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Sand mastic in Frogmill: local notes
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. Historic houses like Harleyford Manor (about 1 mile north-east) are a reminder that the area around Frogmill has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like Danesfield School? Then its window and door frames need their mastic kept sound, just like a home’s. For landlords with property near Henley-On-Thames station, any sash windows need sound mastic to keep draughts and rain out.
Frogmill is about 3 miles south-west of Marlow, in Windsor and Maidenhead. Wherever you are in the SL6 postcode area, we cover sand mastic for homes and businesses. Across Windsor and Maidenhead, we cover 57 places, Frogmill among them. For nearby work, see our Reading page, about 9 miles away.
Here we cover the SL6 postcode area for sand mastic. Neighbouring places we cover for sand mastic include Medmenham (1 mile north-west), Hurley (1 mile east), Danesfield (1 mile north), Bockmer End (1 mile north) and Cockpole Green (2 miles south-west). Further out, we also cover Maidenhead (4 miles east), Windsor (10 miles south-east), Boyn Hill (5 miles south-east), North Ascot (11 miles south-east), Cookham (4 miles east) and Furze Platt (4 miles east).
What’s near Frogmill
We work in homes and buildings around Black Boys Inn, among other places. Frogmill’s nearest station is Henley-On-Thames station, about 3.1 miles west. Nearby you will also find Marlow Community Hospital (3.2 miles north-east) and Marlow Museum (2.7 miles north-east). For a walk, there’s Hurley Chalk Pit and Weycock Hill.