West Berkshire · England
Sand mastic for sash & case windows in Mortimer, West Berkshire
Sand mastic in Mortimer from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- A silicone bead on a sash window that spoils the look
- Cement or filler used on old window joints that has cracked
- Mastic round period door frames that has failed
About our sand mastic in Mortimer
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. If you have open joints round the window box and gaps round a timber door in stone or brick, we can help, on period & listed homes, tenement windows and stone surrounds alike.
Around Mortimer, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
We stand behind the work with a one-year guarantee.
- Where
- Mortimer (RG7)
- Wider area
- West Berkshire
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Mortimer
Previous repairs in cement or silicone often trap water or crack away. They don’t suit the joint and we normally remove them.
It’s worth asking for a quote if you see:
- Gaps where the frame meets the masonry
- Modern sealant on a period surround
- Mastic round period door frames that has failed
- Draughts and rain around sash boxes
Managing a site like Mortimer St John's C.E. Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- When the joint can take water or movement
- Is the old sealant removed completely?
- How hidden problems are handled
- Whether the sealant suits the joint
Why it’s worth doing now in Mortimer
Filling over old, loose mastic does not last. Raking out and preparing the joint gives it a sound base so the new work lasts. Homes in smaller places like Mortimer can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why book with us
- More than 20 years in sealant work
- Fully insured
- Domestic, commercial and hotel work
- Rated 4.9 stars on Google
Read what affects the cost and what customers say.
What sand mastic looks like in Mortimer
Historic houses like Stratfield Saye House (about 3.6 miles south-east) are a reminder that the area around Mortimer has older buildings as well as new. 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.
Homes close to Mortimer Methodist Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Mortimer station, any sash windows need sound mastic to keep draughts and rain out.
Mortimer is about 4 miles north-east of Tadley, in West Berkshire. Mortimer gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Our West Berkshire coverage runs to 155 places, and Mortimer is one of them. For nearby work, see our Reading page (6 miles or so).
Work in RG7 works the same way as everywhere else we cover. Whether your property is on The Street, Croft Road and Leigh Field or anywhere close by, we can help. If you are just outside Mortimer, we cover Stratfield Mortimer (1 mile east), Mortimer West End (1 mile south-west), Goddard's Green (2 miles north-east), Burghfield Common (2 miles north) and Wokefield (2 miles north-east). Larger places within reach include Newbury (11 miles west), Thatcham (8 miles west), Speenhamland (11 miles west), Spencers Wood (4 miles east), Calcot (5 miles north) and Shaw (11 miles west).
What’s near Mortimer
In Mortimer, that means homes and buildings near The Willink School, The Willink School and Padworth Common Local Nature Reserve, among other places. For rail, the closest station is Mortimer station, roughly 1.4 miles east of the centre. Other landmarks nearby include Calleva Museum (2 miles south-west) and Beaumys Castle (3.7 miles east). Green spaces nearby include Hosehill Lake.
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Ask the planning authority about consent for listed or conservation-area homes
- Go gently near the mastic when preparing windows
- Sort the mastic before the decorators arrive
- Avoid patching sand mastic with silicone
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
Landlords, agents and businesses in Mortimer
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
If you manage several properties in or around Mortimer, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
How the job changes by surface
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we will confirm access.
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
FAQs for Mortimer
I let a flat near Mortimer station. Can you help?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Can you do sand mastic in Mortimer?
Yes. Our work covers London and the South East, and Mortimer is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. All the old silicone is removed first so the mastic beds in well.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
When will the new mastic be hard?
The surface skins quite quickly and it hardens fully over a longer time. Timing depends on the weather and the joint.
Do you have insurance?
Yes, we are fully insured.
How do I get a quote for sand mastic in Mortimer?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes anything from a few hours to a full day, depending on how many windows. Parking around Mortimer is generally 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.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any water getting in
- Let us know about stairs, lifts or work at height
Ask for a quote
Need a quote? Please call 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before work begins.