Wokingham · England
Waltham St Lawrence Sand Mastic
Sand mastic across Waltham St Lawrence and nearby, with old sealant always removed completely and a 12-month guarantee.
- Gaps round a timber door in stone or brick
- Silicone on a period window that looks wrong
- Draughts and rain around sash boxes
What affects the cost of sand mastic
Your quote is based on your job. We look at:
- The product the joint needs
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
Doing several joints on one visit generally makes better use of the time than several visits. We will send you a clear quote for the lot.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- The address or postcode of the job
- The problem you’ve noticed
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work.
Sand mastic in Waltham St Lawrence, done properly
On many period windows, sand mastic looks right and suits the building. Newer frames normally get a flexible sealant instead and we’ll explain which is best for yours. If you’re dealing with failed mastic on an exposed elevation and wind and rain getting in round a sash window, we can put it right, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Waltham St Lawrence is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Every job is covered by our one-year guarantee.
- Location
- Waltham St Lawrence (RG10)
- Region
- Wokingham
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Waltham St Lawrence: your questions answered
Is Waltham St Lawrence in your area for sand mastic?
Yes, Waltham St Lawrence is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
Is Waltham St Lawrence within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Where do you work from?
We are based in Crawley, and we work across South East England, London and Scotland.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we will advise.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
When to call us in Waltham St Lawrence
Age is the main cause. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
Most people get in touch after spotting one of these:
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
- Crumbling sand mastic round a window
- Tired mastic found when preparing windows for paint
If you live in an older home near Church of St Lawrence, the joint between an old wall and a newer frame is usually the first place rain gets in.
What to look for in a quote
- Are they insured?
- How long the guarantee is
- Whether they seal over old material or remove it
- What the quote includes, VAT included or not
Different surfaces, different methods
Timber door frames
Door frames get knocked and soaked and the mastic can crack early. We rake it out and renew it.
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Why act early in Waltham St Lawrence
Draughts round a sash window aren’t always the sashes. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Older cottages and farmhouses around Waltham St Lawrence can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the size of the job, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why Waltham St Lawrence clients choose us
- ARBOMaster approved applicator
- Sanitary silicone with an anti-fungal additive in wet areas
- Rated 4.9 stars on Google
- Domestic, commercial and hotel work
See our cost guide and what customers say.
Waltham St Lawrence homes and the weather
With historic houses such as Harleyford Manor (about 4.7 miles north) nearby, there’s older building stock in the area around Waltham St Lawrence as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like Waltham St Lawrence Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. If you let a flat or house near Twyford station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Waltham St Lawrence is about 4 miles south-west of Maidenhead, in Wokingham. For sand mastic in and around Waltham St Lawrence, please ring 0345 464 0079 or send us an email for a quick quote. We cover Wokingham from our Crawley base, Waltham St Lawrence included. Waltham St Lawrence is one of 35 towns and villages in Wokingham where we work for sand mastic. There’s also a page for Reading, about 8 miles away.
We work across RG10 for sand mastic. Streets in the area include The Street, Halls Lane and Broadmoor Road. We also cover the places around Waltham St Lawrence: Kiln Green (1 mile north-west), Shurlock Row (1 mile south), Hungerford (1 mile south), The Holt (2 miles north-west) and Hare Hatch (2 miles west). Further out, we also cover Reading (8 miles west), Wokingham (6 miles south), Woodley (4 miles south-west), Earley (7 miles south-west), Crowthorne (8 miles south) and Lower Earley (6 miles south-west).
Landmarks near Waltham St Lawrence
The nearest railway station is Twyford station, roughly 2.6 miles west of the centre. Well-known places in the area include St Mark's Hospital (3.8 miles north-east). Open spaces near Waltham St Lawrence include Hurley Chalk Pit and Weycock Hill.
How it works
Every visit runs the same way: we look at the joints together, protect the area around them, do the work and tidy away. It usually takes a few hours for a single window, longer for several. Somewhere as small as Waltham St Lawrence, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- 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.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Try not to wet indoor joints just before the visit
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
How to get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
Related advice
For landlords and businesses
We work for letting agents and landlords as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Towns and villages near Waltham St Lawrence
Other services in Waltham St Lawrence
DIY versus a professional finish
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.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.