Hertfordshire · England
External Mastic in Maple Cross
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Maple Cross and across Hertfordshire. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
- Old sealant gone brittle and cracked
External mastic in Maple Cross
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. Typical jobs include leaking joints around cladding and façade panels and damp patches traced to an open external joint, on render & cladding joints, copings & trims and façade panels.
Older homes in small places like Maple Cross may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water normally gets in.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Where
- Maple Cross (WD3)
- Region
- Hertfordshire
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render, so the damage spreads beyond the joint. Around Maple Cross, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- We are fully insured
- 4.9 on Google from 180+ five-star reviews
- We never seal over old sealant
- Sealant colour chosen to suit
Read our cost guide and what customers say.
Nearby places to Maple Cross
More services for Maple Cross
Signs you need external mastic in Maple Cross
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall.
These are the problems we are asked about most:
- Cracked joints where brick meets render or frames
- Weathered mastic that no longer stretches
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
If you look after a building such as Maple Cross Junior Mixed Infant and Nursery School, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- Who turns up on the day
- What product goes in the joint
- How hidden problems are handled
- Whether all the old sealant comes out first
Quotes for external mastic in Maple Cross
We do not publish a price list. The quote depends on:
- When we can work, for business premises
- How easy the joints are to reach
- The product the joint needs
- The old material and how stubborn it is
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- If someone has resealed it before
- Where the job is, and your postcode
- How we’d reach the joints
- A few pictures by email, if you can
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Outside joints around Maple Cross
Historic houses like Chenies Manor House (about 3.7 miles north) are a reminder that the area around Maple Cross has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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 St Thomas of Canterbury, old and new materials meet at the roofline and walls, which is where sealant earns its keep. If you let a flat or house near Rickmansworth station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Maple Cross is about 2 miles south-west of Rickmansworth, in Hertfordshire. For external mastic in and around Maple Cross, please phone 0345 464 0079 or drop us an email for a quick quote. We cover Hertfordshire from our Crawley base. Our Hertfordshire coverage runs to 381 places, Maple Cross among them. For nearby work, see our London page.
Here we cover the WD3 postcode area for external mastic. External mastic is available to properties on Pinchfield, Tichborne and Woodwicks. Nearby, we also carry out external mastic in West Hyde (1 mile south), Horn Hill (1 mile west), Heronsgate (1 mile north), Chalfont Common (2 miles west) and Chalfont St Peter (2 miles south-west). We also work in nearby towns such as Watford (6 miles north-east), Hemel Hempstead (9 miles north), St Albans (12 miles north-east), Harpenden (15 miles north-east), Borehamwood (11 miles east) and Berkhamsted (10 miles north).
Local landmarks in Maple Cross
We work in homes and buildings around The Dumb Bell pub and Rickmansworth Aquadrome and the streets around them. For rail, the closest station is Rickmansworth station, roughly 2.2 miles north-east of the centre. Other landmarks nearby include Chiltern Open Air Museum (1.6 miles north-west) and Harefield Hospital (1.7 miles south-east). For a walk, there’s Lynsters Lake and Northmoor Hill Wood.
DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Maple Cross: your questions answered
Do you cover Maple Cross for external mastic?
Yes, Maple Cross is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Do you cover smaller places like Maple Cross?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Are you insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
How long will you be here?
Typically it takes anything from a few hours to several days, depending on the building. Bigger jobs take longer, and we’ll tell you how long to expect.
Can you quote for more than one area?
Yes, we can. More than one area can go on one quote.
What is backing rod for?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. Then call 0345 464 0079 or email us.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces with primer where required.
For landlords and businesses
Landlords and letting agents in Maple Cross can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The work normally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. Somewhere as small as Maple Cross, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Mention any leaks or damp you’ve noticed
- Mention any sign-in or site rules at work premises
Ask for a quote
For external mastic in Maple Cross, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Related advice
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Show decorators and builders where the movement joints are
- Look over the joints every year, ideally after winter
- Fix overflowing gutters above sealed joints
- Have failed joints looked at early
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.