Hertfordshire · England
Sand Mastic in Roe Green
Sand mastic across Roe Green and nearby, with old sealant always removed completely.
- Old cement repairs round a window that have failed
- A silicone bead on a sash window that spoils the look
- Mastic worn away on windows facing the weather
When to call us in Roe Green
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint, and they normally need raking out.
It’s worth asking for a quote if you see:
- Patchy fillers round a sash window
- Mastic worn away on windows facing the weather
- Window mastic to renew ahead of painting
- Mastic dropping out of the joint
Managing a site like Sandon Junior Mixed and Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- How long the guarantee is
- How the surfaces are prepared before sealing
- What the cure time is
- How hidden problems are handled
About our sand mastic in Roe Green
We renew sand mastic around sash windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you’re dealing with mastic worn away on windows facing the weather and tired mastic found when preparing windows for paint, we can help, on period & listed homes, sash and case windows and brick reveals alike.
Homes in small places like Roe Green often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
We stand behind the work with a 12-month guarantee, so you are covered after we’ve gone.
- Place
- Roe Green (SG9)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- How many rooms, windows or areas are involved
- When we can work, for business premises
- The size of the job
- How easy the joints are to reach
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
What to tell us when you ask for a quote:
- The type of property
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Common questions in Roe Green
Can you help a landlord with a rental near Ashwell & Morden station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Is Roe Green within the area you cover?
Yes. Roe Green is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
What is sand mastic?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and finished to sit neatly against the masonry.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They’ll tell you if consent is needed.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Where do you work from?
We’re based in Crawley, and we work across South East England, London and Scotland.
How long does sand mastic take to harden?
It forms a skin fairly soon and it hardens fully over a longer time. The weather and joint depth both affect it.
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that need overhauling
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before you book.
What we seal
- Sash and case windows
- Stone surrounds
- Timber door frames
- Brick reveals
- Period & listed homes
- Tenement windows
Sand mastic in Roe Green: local notes
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of All Saints, 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 Ashwell & Morden station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Roe Green is in Hertfordshire. Wherever you are in the SG9 postcode area, our applicators can take on sand mastic. Our area takes in 381 places across Hertfordshire, large and small. We also work in Chelmsford, about 30 miles from Roe Green.
We work across SG9 for sand mastic and the streets around it. Neighbouring places we cover for sand mastic include Sandon (1 mile north-east), Green End (1 mile east), Rushden (1 mile south-west), Buckland (3 miles east) and Chipping (3 miles south-east). Within a short drive, we also cover Stevenage (7 miles south-west), Bishop's Stortford (13 miles south-east), Welwyn Garden City (14 miles south), Hitchin (8 miles west), Hertford (13 miles south) and Letchworth (6 miles west).
Landmarks near Roe Green
The closest station to Roe Green is Ashwell & Morden station, roughly 3.2 miles north of the centre. Well-known places in the area include Clothall Castle (3.1 miles south-west). The countryside around Roe Green includes Hawkins Wood.
Different surfaces, different methods
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
More services for Roe Green
Can I do it myself?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
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, then guaranteed for a year.
Landlords, agents and businesses in Roe Green
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
How the visit works
Good joint work is mostly preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours per window, depending on the condition of the joints. Somewhere as small as Roe Green, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Mention any parking rules near the property
- Let us know about stairs, lifts or work at height
Getting a quote
For sand mastic in Roe Green, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.