Hampshire · England
Sand mastic for sash & case windows in Clayhall, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Clayhall, with a 12-month guarantee on every job. Ask us for a quote.
- Old cement repairs round a window that have failed
- Gaps where the frame meets the masonry
- Modern sealant on a period surround
Sand mastic in Clayhall
We work across Clayhall renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. We work on stone surrounds, tenement windows and period & listed homes, and people most often call us about weathered mastic on the most exposed windows and open joints round the window box.
In smaller places like Clayhall, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
All of our work is guaranteed for twelve months, in Clayhall and everywhere else we cover.
- Place
- Clayhall (PO12)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Clayhall homes and the weather
Clayhall is within about 1 mile 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. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Haselworth Primary School, larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as St Francis, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Clayhall is about 2 miles south-east of Gosport, in Hampshire. Anywhere in PO12, we can carry out sand mastic at your property. Clayhall is one of 683 towns and villages in Hampshire where we work for sand mastic.
Work in PO12 works the same way as everywhere else we cover. Sand mastic is available to properties on The Lane, Old Road and Fort Road. If you are just outside Clayhall, we cover Haslar (1 mile south-east), Alverstoke (1 mile west), Portsmouth Point (1 mile north-east), Privett (1 mile north-west) and Portsea (2 miles north-east). We also work in nearby towns such as Havant (8 miles north-east), Fareham (6 miles north-west), Horndean (10 miles north-east), Hedge End (12 miles north-west), Waterlooville (8 miles north-east) and Purbrook (7 miles north-east).
Near you in Clayhall
Typical jobs here are in homes near Bay House School, The Fighting Cocks pub and St Vincent College and the streets around them. For rail, the closest station is Portsmouth Harbour station, about 1.4 miles north-east. Nearby you will also find Gosport War Memorial Hospital (1 mile north-west) and Search (0.9 miles north). Not far away are West of the River Alver.
What we can’t put right
Sealant isn’t the answer to every problem, and we’ll tell you before any work starts. Sealant will not put right:
- Timber that has rotted
- Sashes that need overhauling
- Broken panes
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before you book.
What we seal
- Timber door frames
- Period & listed homes
- Sash and case windows
- Brick reveals
- Stone surrounds
- Tenement windows
Why act early in Clayhall
If you’re redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. In a smaller place like Clayhall, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- 12-month guarantee on every job
- Domestic, commercial and hotel work
- Over 20 years’ experience
- We never seal over old sealant
Also near Clayhall
Other services in Clayhall
What we do, step by step
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to a full day, depending on how many windows, including the tidy-up. Parking around Clayhall is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
- Move anything stored near the joints
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Read more
Do you need sand mastic in Clayhall?
Previous repairs in cement or silicone often trap water or crack away. They do not move with the timber, and they normally need raking out.
The problems people normally mention when they call include:
- A silicone bead on a sash window that spoils the look
- Wind and rain getting in round a sash window
- Cracked mastic round a front door frame
- Mastic worn away on windows facing the weather
If you let a flat or house near Portsmouth Harbour station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Questions to ask before you book
- Whether all the old sealant comes out first
- What product goes in the joint
- What the quote includes, VAT included or not
- How the colour is chosen
Work for landlords, hotels and businesses
Landlords and agents in Clayhall can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
What the job involves on each surface
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Questions from Clayhall
Will you come out to Clayhall?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
I let a flat near Portsmouth Harbour station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Where are you based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
What is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s applied by hand and shaped to suit the surround.
What guarantee comes with the work?
There’s a 12-month guarantee on every job.
Which products do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Can you do several jobs on one visit?
Yes. Just list everything you need.
Do you offer different sealant colours?
In most cases you can choose. We will explain which colours are available.
Can I do it myself?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.