Reading · England
Horncastle Sand Mastic
We cover Horncastle for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Open joints round the window box
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
Keeping the joints in good condition
So the new joints stay in good condition:
- Check with your local planning authority if your home is listed
- Have rotten timber repaired before new mastic goes in
- Avoid patching sand mastic with silicone
- Take care around the mastic when scraping paint
Keep gutters and sills clear so water runs away from the 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.
About our sand mastic in Horncastle
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. If you have patchy fillers round a sash window and modern sealant on a period surround, we can help, on sash and case windows, stone surrounds and brick reveals alike.
Houses in smaller places like Horncastle can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Where
- Horncastle (RG30, RG31)
- Region
- Reading
- Cover
- One year on every job
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and finishes neatly against the masonry. In an older home around Horncastle, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
Why Horncastle customers choose us
- We are fully insured
- Approved under the ARBOMaster scheme
- We never seal over old sealant
- Rated 4.9 stars on Google
Read what affects the cost and our reviews.
Common questions in Horncastle
Is Horncastle in your area for sand mastic?
Yes. Our work covers London and the South East, and Horncastle is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Can you help a landlord with a rental near Reading West station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Which is right for my windows, sand mastic or modern sealant?
That depends on your windows. Period windows in stone or brick generally suit sand mastic and newer frames generally get a flexible sealant.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
What sealant 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.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints.
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
When it isn’t the sealant
We’d rather tell you now than do work that won’t last, so these are the limits:
- Damaged stone surrounds
- Sashes that need overhauling
- Putty and glazing repairs
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Tenement windows
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Brick reveals
- Timber door frames
Nearby places to Horncastle
More services for Horncastle
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
What affects the cost of sand mastic
Every job gets its own quote. This is what makes a difference:
- The number and length of the joints
- Mould in or behind the old joints
- How many areas need sealing
- How easy the joints are to reach
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Helping us quote
Before you ask for a quote, have a think about:
- The type of property
- How we’d reach the joints
- Photos by email, if that is easy
- The problem you’ve noticed
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job.
Horncastle homes and the weather
Historic houses like Mapledurham House (about 2.8 miles north) are a reminder that the area around Horncastle 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. 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.
Letting a property close to Reading West station? Then any sash windows need sound mastic to keep draughts and rain out. If you live in an older home near Church of St Michael, the joint between an old wall and a newer frame is normally the first place rain gets in. Managing a site like Kennet Valley Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Horncastle is about 2 miles west of Reading, in Reading. Our applicators cover sand mastic for homes and businesses in Horncastle and the surrounding area, as part of our work across Reading. We cover 34 towns and villages across Reading.
All of RG30 and RG31 is within our area for sand mastic. If you need sand mastic at a property on Low Lane, Usk Road and Mill Lane or a nearby road, we can help. Nearby, we also carry out sand mastic in Fords Farm (1 mile south), Southcote (1 mile east), Tilehurst Within (1 mile north), Beansheaf Farm (1 mile south-west) and Burghfield Bridge (1 mile south). Further out, we also cover Caversham (3 miles north-east), Shinfield (4 miles south-east), Arborfield Garrison (7 miles south-east), Caversham Heights (3 miles north-east), Whitley Wood (3 miles south-east) and Sonning Common (5 miles north). Horncastle is among the bigger towns we cover in Reading.
What’s near Horncastle
In Horncastle, that means homes and buildings near Elvian School, Prospect School and Calcot Park and the streets around them. For rail, the closest station is Reading West station, about 1.6 miles north-east of the centre. Well-known places in the area include Battle Hospital (1.5 miles north-east) and Broad Street Mall (2.2 miles east). For a walk, there’s Fobney Island Wetland Reserve and South Lake.
The process
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. It usually takes anything from a few hours to a full day, depending on how many windows. For a job in Horncastle, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since 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.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Clear items away from the joints we are working on
- For business premises, tell us about site rules or sign-in
- Tell us if parking is tricky
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.