Wokingham · England
Knowl Hill Sand Mastic
Sand mastic for Knowl Hill and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Draughts and rain around sash boxes
- Patchy fillers round a sash window
- Weathered mastic on the most exposed windows
Leave it or put it right?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and blends with the stone or brick. Older cottages and farmhouses around Knowl Hill can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
The cost reflects the work involved, not guesswork. That is why we ask about the job first and agree the price before starting.
What you get with us
- Full insurance on every job
- Anti-fungal sanitary silicone in wet areas
- Any old sealant cut out fully, not covered over
- Trusted Arbo and Everbuild sealants
See what affects the cost and customer reviews.
Sand mastic in Knowl Hill
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 and built up by hand. On older homes, it suits the building far better than silicone. We are often asked to deal with modern sealant on a period surround and mastic that needs renewing before redecorating, on stone surrounds, tenement windows and timber door frames.
Somewhere as small as Knowl Hill, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Knowl Hill (RG10)
- Wider area
- Wokingham
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Also near Knowl Hill
More services for Knowl Hill
Frames and glazing around Knowl Hill
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 Harleyford Manor (about 3 miles north) are a reminder that the area around Knowl Hill 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’s traditional sand mastic.
Homes close to Saint Peter include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near Wargrave station, any sash windows need sound mastic to keep draughts and rain out. Managing a site like Knowl Hill Church of England Primary Academy? Then larger buildings have plenty of frames, and the mastic around each one ages.
Knowl Hill is about 4 miles west of Maidenhead, in Wokingham. From the centre of Knowl Hill to the outskirts, we cover sand mastic for every kind of property. Knowl Hill is one of 35 towns and villages in Wokingham we cover. Our Reading page covers work nearby, about 8 miles away.
Jobs for sand mastic in RG10 is quoted and booked the same way as anywhere else. We cover properties on Star Lane, Choseley Road and Choseley Close and the roads around them. Other places close to Knowl Hill include Warren Row (1 mile north-west), Cold Harbour (1 mile south-east), Bowsey Hill (1 mile west), Cockpole Green (2 miles north-west) and Wargrave (2 miles west). We also work in nearby towns such as Reading (8 miles south-west), Wokingham (7 miles south), Woodley (5 miles south-west), Earley (7 miles south-west), Crowthorne (9 miles south) and Lower Earley (7 miles south-west).
Landmarks near Knowl Hill
Around Knowl Hill, our work takes us to homes and buildings near Seven Stars Public House And Attached Stables, among other places. For rail, the closest station is Wargrave station, roughly 2.7 miles west. Other landmarks nearby include Frazer Nash Archives (3.6 miles west) and St Mark's Hospital (3.3 miles east). Green spaces nearby include Weycock Hill and Hurley Chalk Pit.
What we do, step by step
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a few hours per window, depending on the condition of the joints. In a small place like Knowl Hill, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Mention any sign-in or site rules at work premises
- Tell us if parking is tricky
- Keep pets and children clear of the area while we work
Get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you are ready, phone 0345 464 0079 or email us.
Related advice
DIY versus a professional finish
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.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Different surfaces, different methods
Tenement and terrace windows
Where a building is shared, window work may involve neighbours, so check who is responsible first.
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Keeping the joints in good condition
So the new joints stay in good condition:
- Avoid patching sand mastic with silicone
- Look over the window mastic once a year
- Sort the mastic before the decorators arrive
- Find out about consent before window work on a listed home
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
What affects the cost of sand mastic
We don’t publish a price list. What we look at:
- Any mould that needs treating
- The old material and how stubborn it is
- Which sealant suits the joint
- Access and height
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- A few photos by email, if you can
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.
For landlords and businesses
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
If you manage several properties in or around Knowl Hill, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Knowl Hill questions
Is Knowl Hill in your area for sand mastic?
Yes, Knowl Hill is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Is Knowl Hill within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you guarantee sand mastic work?
Every job comes with our 12-month guarantee, and we’re fully insured.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
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.
When will the new mastic be hard?
Not straight away. It skins first and hardens fully later and we will give you an idea for your job.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.