Hampshire · England
Lower Slackstead Sand Mastic
Sand mastic across Lower Slackstead and nearby, with old sealant always removed completely.
- Wind and rain getting in round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
- Old cement repairs round a window that have failed
When it is not the sealant
It helps to know what we can’t do:
- Masonry that needs repairing
- Sash cords, weights and draught-proofing of the sashes
- Cracked or broken glass
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Period & listed homes
- Stone surrounds
- Timber door frames
- Brick reveals
- Tenement windows
- Sash and case windows
About our sand mastic in Lower Slackstead
A silicone bead around a sash window can look out of place and is not always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. If you’re dealing with failed mastic on an exposed elevation and old sand mastic that has cracked, crumbled or fallen out, we can help, whatever the surface.
Somewhere as small as Lower Slackstead, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Location
- Lower Slackstead (SO51)
- Region
- Hampshire
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We cut it out and start again.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Leave it or put it right?
New mastic over crumbling mastic will not hold. We remove the loose material first so the new mastic stays put. Around Lower Slackstead, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Why us?
- A 12-month guarantee on all work
- Any old sealant cut out fully, not covered over
- Arbo and Everbuild products
- Fully insured
See our cost guide or customer reviews.
What sand mastic looks like in Lower Slackstead
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. With historic houses such as Mottisfont Abbey (about 4.3 miles west) nearby, there’s older building stock in the area around Lower Slackstead as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Rented homes near Romsey station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Lower Slackstead is about 3 miles north-east of Romsey, in Hampshire. For sand mastic in and around Lower Slackstead, please ring 0345 464 0079 or email us for a quick quote. We cover Hampshire from our Crawley base, Lower Slackstead included. Across Hampshire, we cover 683 places, and Lower Slackstead is one of them. We also work in Southampton, around 8 miles away.
Our applicators cover all of the SO51 postcode area for sand mastic and the streets around it. Neighbouring places we cover for sand mastic include Knapp (1 mile south-east), Braishfield (1 mile west), Ampfield (1 mile south), Gosport (2 miles south) and Crampmoor (2 miles south-west). We also work in nearby towns such as Winchester (6 miles north-east), Eastleigh (6 miles south-east), Andover (13 miles north), Totton (8 miles south), Chandler's Ford (4 miles south-east) and Hedge End (10 miles south-east).
Around Lower Slackstead
Lower Slackstead’s nearest station is Romsey station, about 3.3 miles south-west of the centre. Well-known places in the area include King Johns House (3.7 miles south-west) and Romsey Community Hospital (3 miles south-west). Green spaces nearby include Emer Bog and Baddesley Common.
What the job involves on each surface
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Go gently near the mastic when preparing windows
- Keep modern sealant off the mastic
- Inspect the joints round the windows every year or so
- Plan mastic work ahead of painting
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Questions from Lower Slackstead
Can you help a landlord with a rental near Romsey 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’ll give you a fixed price before we start.
Do you cover Lower Slackstead for sand mastic?
Yes. Our work covers London and the South East, and Lower Slackstead is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
Can you replace silicone on a period window with sand mastic?
Often, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Lower Slackstead and the rest of Hampshire, along with the rest of our area.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme.
Do I need permission for sand mastic on a listed building?
Check with your local planning authority. They’ll tell you if consent is needed.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access.
How the visit works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for a single window, longer for several. In a small place like Lower Slackstead, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We pack any deep gaps so the mastic sits at the right depth.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Move anything stored near the joints
- For business premises, tell us about site rules or sign-in
- Let us know if you’ve seen damp or leaks
How to get a quote
Getting a quote is simple: let us know what needs doing and where. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
Related advice
Other services in Lower Slackstead
When to call us in Lower Slackstead
Some old mastic was never deep enough. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Look out for these signs:
- Gaps between timber frames and stone or brick
- Weathered mastic on the most exposed windows
- Mastic dropping out of the joint
- A silicone bead on a sash window that spoils the look
If you live in an older home near Church of All Saints, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What your quote should include
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
- What the cure time is