Hampshire · England
Cadnam Sand Mastic
Sand mastic for Cadnam, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Tired mastic found when preparing windows for paint
- Modern sealant on a period surround
- Draughty sash windows at the surround
Signs you need sand mastic in Cadnam
Paint, silicone or cement used over old mastic causes problems. They do not move with the timber and we normally remove them.
Any of these means the joints need attention:
- Draughty sash windows at the surround
- Gaps where the frame meets the masonry
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
Letting a property close to Ashurst New Forest station? Then any sash windows need sound mastic to keep draughts and rain out.
What to look for in a quote
- How long the guarantee is
- What preparation is included
- Who does the work, and how experienced they are
- When the joint can take water or movement
About our sand mastic in Cadnam
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 period homes, it looks right where silicone wouldn’t. We work on period & listed homes, sash and case windows and brick reveals, and people most often call us about cement or filler used on old window joints that has cracked and old sand mastic that has cracked, crumbled or fallen out.
Mastic can only go onto a dry, clean joint, so window work in Cadnam is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Cadnam (SO40)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Cadnam
Your quote is based on your job. We look at:
- The product the joint needs
- Any mould that needs treating
- The number of rooms or windows
- Whether the work is at height
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Helping us quote
When you call or email, it’s useful to know:
- Roughly how big the job is
- Whether it has been sealed before
- Whether it’s a home or a business
- A few pictures by email, if you can
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
Leave it or put it right?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad and new mastic seals them. Older cottages and farmhouses around Cadnam can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts.
Why us?
- Homes, businesses and hotels
- We never seal over old sealant
- Neat joints and a tidy finish
- An ARBOMaster approved applicator
Take a look at what affects the cost and our reviews.
Windows and doors in Cadnam
Historic houses like Landford Manor (about 4.6 miles north-west) are a reminder that the area around Cadnam has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like Bartley Church of England Junior School? Then larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as Church of St Mary, the joint between an old wall and a newer frame is usually the first place rain gets in.
Cadnam is about 3 miles west of Totton, in Hampshire. Cadnam gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Our Hampshire coverage runs to 683 places, Cadnam among them. There’s also a page for Southampton, about 8 miles away.
We work across SO40 for sand mastic. Sand mastic is available to properties on Old Lyndhurst Road, White Hart Lane and Southampton Road. We also cover Wittensford (1 mile west), Bartley (1 mile south-east), Copythorne (1 mile north-east), Newbridge (1 mile north) and Winsor (1 mile east). Further out, we also cover Winchester (15 miles north-east), Eastleigh (11 miles east), Totton (3 miles east), Chandler's Ford (9 miles north-east), Hedge End (12 miles east) and Lymington (11 miles south).
Near you in Cadnam
Around Cadnam, our work takes us to homes and buildings near The White Hart pub and the streets around them. For rail, the closest station is Ashurst New Forest station, roughly 3.1 miles south-east of the centre. Nearby you’ll also find Tatchbury Mount Hospital (2.2 miles east) and National Dairy Museum (3.6 miles south-east). For a walk, there’s Copythorne Common.
When it isn’t the sealant
In fairness, some problems need a different trade:
- Sashes that rattle, stick or won’t open
- Rotten sashes, sills or window boxes (a joiner’s job)
- Putty and glazing repairs
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.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Tenement windows
- Timber door frames
- Brick reveals
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Ask us before painting near the mastic
- Plan mastic work ahead of painting
- Don’t run silicone over sand mastic
- Clear gutters so water doesn’t pour onto the windows
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
What happens on the day
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to a full day, depending on how many windows from start to finish. For a village or hamlet like Cadnam, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Tell us if parking is tricky
- Mention any tricky access
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Simply call 0345 464 0079 or send us an email and describe the job.
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Cadnam questions
Do you work for landlords with property near Ashurst New Forest station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Will you come out to Cadnam?
Yes, Cadnam is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you match the sealant colour?
Yes. Sealants come in white, clear, grey and other colours, and we agree the colour with you before we start.
What guarantee comes with the work?
Every job comes with our 12-month guarantee, and we are fully insured.
Where are you based?
We work from Crawley. We cover Cadnam and the rest of Hampshire, along with the rest of our area.
Should I use sand mastic or silicone?
Sand mastic usually suits period timber windows best. On modern frames, we’d normally use a flexible sealant.
When will the new mastic be hard?
Not right away. The skin forms first, and the full set comes later, and we will tell you what to expect.
Can you do several jobs on one visit?
Yes. Just list everything you need and you will get one quote.
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.