Hertfordshire · England
Sand mastic for sash & case windows in Adeyfield, Hertfordshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Adeyfield, backed by a one-year guarantee. Ask us for a quote.
- Cement or filler used on old window joints that has cracked
- Gaps round a timber door in stone or brick
- Draughty sash windows at the surround
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
About our sand mastic in Adeyfield
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you have gaps between timber frames and stone or brick and crumbling sand mastic round a window, we can help.
Houses in smaller places like Adeyfield 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.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Adeyfield (HP2, HP3)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
Landlords and letting agents in Adeyfield can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Surface by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside so we finish it carefully.
Timber door frames
Sand mastic is used round timber door frames too. The method is the same as for windows.
Common questions in Adeyfield
Will you come out to Adeyfield?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Apsley station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Do you take out the old sealant first?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Is consent needed for window work on a listed home?
Yes, it’s worth checking. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. Indoors, that usually means someone at home.
Do you hold any approvals?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Are you insured?
Yes, we’re fully insured for domestic and commercial work.
How long will you be here?
A typical job takes a few hours per window, depending on the condition of the joints, including the preparation. We’ll confirm how long when we quote.
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Make sure water runs off the sill
- Have rotten timber repaired before new mastic goes in
- Ask the planning authority about consent for listed or conservation-area homes
- Plan mastic work ahead of painting
Leave the new mastic alone while it firms up. It forms a skin fairly soon but needs longer to fully harden.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
How it works
On the day, we look over the joints with you first. Surfaces next to the work are protected before any work begins. Most jobs take a few hours for a single window, longer for several. For a job in Adeyfield, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we’re working on
- On commercial sites, let us know about site rules
Ask for a quote
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.
Read more
What happens if it’s left?
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Homes in smaller places like Adeyfield can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
What you get with us
- Every job guaranteed for a year
- Sanitary silicone with an anti-fungal additive in wet areas
- Homes, businesses and hotels
- Over 20 years’ experience
Take a look at how sealant jobs are priced and customer reviews.
Frames and glazing around Adeyfield
Historic houses like Batchwood Hall (about 4.2 miles east) are a reminder that the area around Adeyfield 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. Hemel Hempstead, which Adeyfield is part of, is one of England’s post-war new towns. With many homes from the post-war decades, replacement windows and doors are common. The mastic around replacement frames ages too, and gaps at sills and frame heads are where water gets in.
In the older streets around St Barnabas, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Apsley station? Then any sash windows need sound mastic to keep draughts and rain out.
Adeyfield is about 1 mile north-east of Hemel Hempstead, in Hertfordshire. Our applicators cover sand mastic for homeowners, landlords and businesses in Adeyfield and nearby. Across Hertfordshire, we cover 381 places, and Adeyfield is one of them. For nearby work, see our London page.
Work in HP2 and HP3 is quoted and booked the same way as anywhere else. You’ll find streets such as Tudor Road, Hardy Road and Great Road, and we cover them all. Adeyfield is on the A414, which makes it straightforward to reach. Close by, we work in Hemel Hempstead (1 mile south-west), Highfield (1 mile north-west), Grovehill (1 mile west), Woodhall Farm (1 mile west) and Leverstock Green (1 mile south-east). Further out, we also cover Watford (7 miles south), St Albans (5 miles east), Welwyn Garden City (11 miles east), Harpenden (6 miles north-east), Hitchin (15 miles north-east) and Hatfield (9 miles east).
Local landmarks in Adeyfield
Locally, jobs take us to homes and businesses close to Adeyfield School, Gadebridge Park and Rose And Crown Public House. The closest station to Adeyfield is Apsley station, about 1.7 miles south. A little further out are Hemel Hempstead Hospital (0.9 miles south-west) and Redbourn Museum (3.6 miles north-east). Open spaces near Adeyfield include Long Deans and Verulamium Lake.
Nearby places to Adeyfield
What else we do in Adeyfield
What we’re called out for in Adeyfield
Timber frames move with the seasons. The movement cracks the mastic over time.
Signs it’s time to call us include:
- Open joints round the window box
- A silicone bead on a sash window that spoils the look
- Tired mastic found when preparing windows for paint
- Failed mastic on an exposed elevation
Managing a site like Hobletts Manor Infants' School? Then its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- Are they insured?
- What happens if the job turns out different
- Whether they seal over old material or remove it
- What preparation is included