Reading · England
Sand mastic for sash & case windows in Caversham Heights, Reading
Our applicators work in Caversham Heights on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Open joints round the window box
- Old sand mastic that has cracked, crumbled or fallen out
- A silicone bead on a sash window that spoils the look
How we handle sand mastic in Caversham Heights
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, applied by hand. On period homes, it looks right where silicone wouldn’t. Typical jobs include mastic that needs renewing before redecorating and open joints round the window box, across period & listed homes, tenement windows and brick reveals.
Around Caversham Heights, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows.
Big or small, it’s backed by our 12-month guarantee.
- Where
- Caversham Heights (RG4)
- Wider area
- Reading
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Caversham Heights: your questions answered
Do you cover Caversham Heights for sand mastic?
Yes, Caversham Heights is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Do you cover smaller places like Caversham Heights?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How much does sand mastic cost in Caversham Heights?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before any work starts.
What guarantee comes with the work?
Every job comes with our 12-month guarantee.
Where do you work from?
We are based in Crawley, and we work across South East England, London and Scotland.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic usually suits period timber windows best. On modern frames, we’d normally use a flexible sealant.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Ask your local planning authority whether consent is needed for listed or conservation-area properties.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
DIY sealant or a professional job?
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.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
When something else is needed
A few problems are outside what sealant work can do:
- Putty and glazing repairs
- Planning or listed building consent (your local planning authority decides)
- Sash cords, weights and draught-proofing of the sashes
If you are not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Where we work in Caversham Heights
- Stone surrounds
- Sash and case windows
- Brick reveals
- Timber door frames
- Tenement windows
- Period & listed homes
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Renew mastic before redecorating the windows
- Leave the new mastic unpainted
- Do not run silicone over sand mastic
- Check the mastic when you check the paintwork
Avoid painting over the new mastic, as traditional guidance advises. Ask us before any decorating around it.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Places near Caversham Heights
Also in Caversham Heights
How we quote for sand mastic
For a quick quote, just ask. The main things that affect it are:
- Whether there’s mould to deal with
- The product the joint needs
- How many areas need sealing
- Access and height
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts, so you know where you stand.
What we need to know
To help us quote quickly, please include:
- What’s wrong with the joints now
- Roughly how big the job is
- Any previous sealing or DIY work
- The type of property
We quote each job on its own, so the first step is telling us about yours. Simply ring 0345 464 0079 or drop us an email and describe the job and send pictures if you have them.
When to call us in Caversham Heights
Rain on the window surround works into any crack and loosens it further. Windows facing the weather tend to go first.
Any of these means the joints need attention:
- Draughty sash windows at the surround
- Cement or filler used on old window joints that has cracked
- Mastic worn away on windows facing the weather
- Open joints round the window box
Letting a property close to Reading station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Questions to ask before you book
- Whether you can choose the colour
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- Which sealant they’ll use, and why
What sand mastic looks like in Caversham Heights
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Mapledurham House (about 2.1 miles west) are a reminder that the area around Caversham Heights has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as Caversham Primary School, the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near St. Andrew's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Caversham Heights is about 1 mile west of Caversham, in Reading. From the centre of Caversham Heights to the outskirts, sand mastic is available for homes and businesses alike. Our Reading coverage runs to 34 places, and Caversham Heights is one of them.
All of RG4 is within our area for sand mastic, from the main roads to the quietest streets. We cover properties on River Road, Chazey Road and Albert Road. If you’re just outside Caversham Heights, we cover Caversham (1 mile east), Tokers Green (1 mile north), Emmer Green (1 mile north-east), Lower Caversham (1 mile south-east) and Chalkhouse Green (1 mile north). We also work in nearby towns such as Shinfield (5 miles south), Arborfield Garrison (8 miles south-east), Horncastle (3 miles south-west), Whitley Wood (4 miles south), Sonning Common (3 miles north) and Fords Farm (3 miles south-west). Caversham Heights is among the bigger towns we cover in Reading.
Near you in Caversham Heights
We work in homes and buildings around Hemdean House School, Round Copse and Highdown School and Sixth Form Centre and the streets around them. The nearest railway station is Reading station, about 1.4 miles south-east. Well-known places in the area include Battle Hospital (1.3 miles south) and Royal Berkshire Regiment Museum (1.4 miles south-west). Open spaces near Caversham Heights include Fobney Island Wetland Reserve and Sonning Hill.
What happens on the day
When we arrive, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before we start. The work generally takes anything from a few hours to a full day, depending on how many windows. Parking around Caversham Heights is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- 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.
Before we arrive
- Mention if the joints have been sealed before
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know if you’ve seen damp or leaks
Get a quote
For sand mastic in Caversham Heights, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.