Hampshire · England
Firgo Sand Mastic
Window and door surrounds in Firgo need attention? We cut out the old, prepare the joints and apply the right sealant.
- Old cement repairs round a window that have failed
- Open joints round the window box
- Mastic dropping out of the joint
Landlord and commercial work in Firgo
We also work for property managers and facilities teams. Several sites can go on one quote.
Landlords and agents in Firgo can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Sand mastic in Firgo
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on tenement windows, timber door frames and sash and case windows, and the jobs we see most are mastic that needs renewing before redecorating and gaps between timber frames and stone or brick.
Around Firgo, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
All of our work is guaranteed for twelve months.
- Location
- Firgo (RG28)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Also near Firgo
What else we do in Firgo
When something else is needed
To be straight with you, there are a few things sealant won’t fix:
- Broken panes
- Masonry that needs repairing
- Sash cords, weights and draught-proofing of the sashes
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
What we seal
- Sash and case windows
- Period & listed homes
- Brick reveals
- Timber door frames
- Tenement windows
- Stone surrounds
How the visit works
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours for a single window, longer for several. In a small place like Firgo, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Tell us if parking is tricky
- Let us know about stairs, lifts or work at height
- Keep children and pets away from the work area
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Just ring 0345 464 0079 or drop us an email with the details.
Related advice
Signs you need sand mastic in Firgo
Paint, silicone or cement used over old mastic causes problems. They don’t suit the joint and we normally remove them.
Signs it’s time to call us include:
- Mastic that needs renewing before redecorating
- Gaps between timber frames and stone or brick
- Mastic dropping out of the joint
- Draughty sash windows at the surround
If you let a flat or house near Whitchurch (Hampshire) station, any sash windows need sound mastic to keep draughts and rain out.
Comparing quotes
- Are they insured?
- Whether all the old sealant comes out first
- How much experience the applicator has
- How long the guarantee is
Firgo questions
Is Firgo within the area you cover?
Yes. Firgo is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you do sand mastic in Firgo?
Yes, Firgo is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we will give you a clear quote.
When will the new mastic be hard?
The surface skins quite quickly and it hardens fully over a longer time. Timing depends on the weather and the joint.
Where is Mr Mastic based?
We work from Crawley. We cover Firgo and the rest of Hampshire.
Should I use sand mastic or silicone?
We will help you decide. Period homes often look best with sand mastic, and modern sealants suit newer frames.
What exactly is sand mastic?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Can old silicone round a sash window be swapped for sand mastic?
Yes. We remove the silicone and clean the joint, then point it with sand mastic.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
What happens if it’s left?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. In a small place like Firgo, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
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. We take all of that into account in your quote.
Why choose Mr Mastic in Firgo
- Full insurance on every job
- Sanitary silicone with an anti-fungal additive in wet areas
- Homes, businesses and hotels
- Any old sealant cut out fully, not covered over
Take a look at our cost guide and customer reviews.
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
What sand mastic looks like in Firgo
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around Church of St Mary, the joint between an old wall and a newer frame is generally the first place rain gets in. For site and facilities teams at buildings such as Testbourne Community School, the mastic around its windows and doors needs looking after like any other building’s.
Firgo is about 6 miles east of Andover, in Hampshire. Across the RG28 area, we can carry out sand mastic at your property. Our area takes in 683 places across Hampshire, large and small. You can also see our page for Southampton, about 20 miles away.
Every address in RG28 is covered for sand mastic. Other places close to Firgo include Hurstbourne Priors (2 miles north-west), Whitchurch (2 miles north), Wells-in-the-Field (2 miles north-east), Freefolk (3 miles north-east) and Cole Henley (4 miles north). Further out, we also cover Basingstoke (11 miles north-east), Winchester (10 miles south), Andover (6 miles west), Chandler's Ford (15 miles south), Tadley (13 miles north-east) and Hyde (9 miles south).
Landmarks near Firgo
The nearest railway station is Whitchurch (Hampshire) station, about 2.4 miles north of the centre.
What affects the cost of sand mastic
Jobs vary more than people expect. The main factors:
- The size of the job
- Whether old sealant or filler has to be cut out
- Access and height
- The number of rooms or windows
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
What to tell us for a quote
To help us quote quickly, let us know:
- Where the property is
- What’s wrong with the joints now
- The type of property
- Photos by email, if that’s easy
Asking for a quote is easy: let us know the job and the location. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.