Kent · England
Sand Mastic in Highstreet
Professional sand mastic in and around Highstreet, with old sealant always removed completely and a 12-month guarantee.
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
Questions from Highstreet
Do you work for landlords with property near Whitstable station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Is Highstreet within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Highstreet and the rest of Kent, along with the rest of our area.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we are using.
Can you match the sealant colour?
Normally, yes. Sealants come in white, clear, grey and other colours, and we agree the colour with you before any work starts.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
How we handle sand mastic in Highstreet
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. Common call-outs are for draughty sash windows at the surround and failed mastic on an exposed elevation, on stone surrounds, brick reveals and sash and case windows.
In a village or hamlet like Highstreet, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Place
- Highstreet (ME13)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What happens if it’s left?
New mastic over crumbling mastic will not hold. Raking out and preparing the joint gives it a sound base so the new work lasts. Where a wall is exposed, as many are in small places like Highstreet, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
Why book with us
- Quality sealants from Arbo and Everbuild
- Anti-fungal sanitary silicone in wet areas
- Approved under the ARBOMaster scheme
- Neat joints and a tidy finish
Also in Highstreet
DIY versus a professional finish
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The process
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself normally takes a few hours for a single window, longer for several, depending on the size of the job. In a small place like Highstreet, access is generally 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.
- 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.
Preparing for the visit
- Tell us about any water getting in
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
Ask for a quote
If you are in Highstreet and need sand mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Advice
Sand mastic in Highstreet: local notes
Highstreet is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Whitstable station, any sash windows need sound mastic to keep draughts and rain out.
Highstreet is about 3 miles south-west of Whitstable, in Kent. Across the ME13 area, we cover sand mastic for homes and businesses. Across Kent, we cover 922 places, and Highstreet is one of them. Our Chelmsford page covers work nearby (36 miles or so).
Every address in ME13 is covered for sand mastic. If you need sand mastic at a property on Thanet Way and Highstreet Road or anywhere close by, our applicators can take on the job. Other places close to Highstreet include Waterham (1 mile west), Dargate (1 mile south-west), Seasalter (1 mile north), Hernhill (2 miles south-west) and Slutshole (2 miles south-west). Larger places within reach include Ashford (14 miles south), Canterbury (5 miles south-east), Sittingbourne (11 miles west), Whitstable (3 miles north-east), Faversham (4 miles west) and Herne Bay (7 miles north-east).
Around Highstreet
We work in homes and buildings around Foxes Cross Bottom, among other places. The nearest railway station is Whitstable station, about 3 miles north-east of the centre. Well-known places in the area include Whitstable and Tankerton Hospital (3.6 miles north-east) and Tankerton Castle (3.3 miles north-east). Green spaces nearby include Blean Woods RSPB Reserve.
What we can’t put right
In fairness, there are a few things sealant won’t fix:
- Cracked or broken glass
- Masonry that needs repairing
- Decisions on consent for listed homes
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
What we seal
- Stone surrounds
- Timber door frames
- Sash and case windows
- Brick reveals
- Tenement windows
- Period & listed homes
Aftercare tips
Looking after new joints is easy:
- Avoid patching sand mastic with silicone
- Ask the planning authority about consent for listed or conservation-area homes
- Ask a joiner to look at soft timber first
- Leave the new mastic unpainted
Leave the new mastic alone while it firms up. It skins over quickly but needs longer to fully harden.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Common problems we fix in Highstreet
Rain on the window surround works into any crack and loosens it further. Exposed elevations normally fail first.
People usually contact us when they notice one of these:
- Crumbling sand mastic round a window
- Draughty sash windows at the surround
- Cracked mastic round a front door frame
- Tired mastic found when preparing windows for paint
In and around Highstreet, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Comparing quotes
- Whether all the old sealant comes out first
- How hidden problems are handled
- How the surfaces are prepared before sealing
- What the quote includes, VAT included or not
How the job changes by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.