Medway · England
Sand Mastic in Borstal
Specialist sand mastic for Borstal: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Silicone on a period window that looks wrong
- Crumbling sand mastic round a window
- Tired mastic found when preparing windows for paint
About our sand mastic in Borstal
Sand mastic suits most period window surrounds. Newer frames usually get a flexible sealant instead and we’ll explain which is best for yours. Common call-outs are for mastic worn away on windows facing the weather and gaps where the frame meets the masonry, across period & listed homes, timber door frames and sash and case windows.
Many houses in smaller places like Borstal have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows.
A 12-month guarantee comes as standard.
- Place
- Borstal (ME1, ME2)
- Region
- Medway
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
So the new joints stay in good condition:
- Ask the planning authority about consent for listed or conservation-area homes
- Get any rot dealt with first
- Renew mastic before redecorating the windows
- Keep modern sealant off the mastic
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Quotes for sand mastic in Borstal
Jobs vary more than people expect. What affects the quote:
- How many areas need sealing
- Which sealant suits the joint
- Whether there’s mould to deal with
- Working hours on commercial sites
What it costs depends on how much there is to do, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The address or postcode of the job
- If someone has resealed it before
- Pictures of the joints, sent by email
- The type of property
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or drop us an email.
Landlord and commercial work in Borstal
Housing providers, facilities teams and property managers book us too in Borstal and across Medway. We can quote a run of properties together, and we’re fully insured.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Borstal: your questions answered
Is Borstal within the area you cover?
Yes. Borstal is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you work for landlords with property near Cuxton station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. You can call 0345 464 0079 or email us with the details for a clear quote.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
What does sand mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will talk you through it.
What the job involves on each surface
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Signs you need sand mastic in Borstal
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint.
Common reasons people contact us are:
- Gaps between timber frames and stone or brick
- Old cement repairs round a window that have failed
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
If you live in an older home near St Matthew's, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before you book anyone
- Which sealant they’ll use, and why
- Whether all the old sealant comes out first
- The length of the guarantee
- What preparation is included
Frames and glazing around Borstal
With historic houses such as Temple Manor (about 1 mile north) nearby, there’s older building stock in the area around Borstal as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Managing a site like St William of Perth Roman Catholic Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Cuxton station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Borstal is about 1 mile south-west of Rochester, in Medway. Anywhere in ME1, we can carry out sand mastic at your property. Our area takes in 68 places across Medway, from the larger towns to small villages. We also work in Chelmsford, around 25 miles away.
All of ME1 and ME2 is covered for sand mastic, from the main roads to the quietest streets. That includes homes and businesses on Hill Road, Manor Lane and Mount Road and the roads around them. Borstal sits on or near the M2. Other places close to Borstal include Rochester (1 mile north-east), Strood (1 mile north), Cuxton (1 mile west), North Halling (2 miles west) and Wouldham (2 miles south-west). Further out, we also cover Gillingham (4 miles east), Rainham (5 miles east), Park Wood (5 miles east), Lordswood (4 miles south-east), Twydall (4 miles east) and Hoo St Werburgh (5 miles north-east).
Landmarks near Borstal
We work in homes and buildings around Sir Joseph Williamson's Mathematical School, Former Ordnance Store At Chatham Gun Wharf and St John Fisher RC Comprehensive School, among other places. Borstal’s nearest station is Cuxton station, about 1 mile west. Well-known places in the area include Six Poor Travellers House (1.3 miles north-east) and Rochester Castle (1.3 miles north-east). Not far away are Blue Bell Hill and Ranscombe Farm.
Why it’s worth doing now in Borstal
Draughts round a sash window aren’t always the sashes. Gaps between the frame and the wall can be just as bad and new mastic seals them. In an older home around Borstal, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What you get with us
- Arbo and Everbuild products
- 4.9 on Google from 180+ five-star reviews
- Neat joints and a tidy finish
- Domestic, commercial and hotel work
Take a look at how sealant jobs are priced or what customers say.
What happens on the day
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours per window, depending on the condition of the joints. For a job in Borstal, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Move anything stored near the joints
- For business premises, tell us about site rules or sign-in
- Let us know about stairs, lifts or work at height
Getting a quote
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.