Hertfordshire · England
External Mastic in Rickmansworth
External mastic for Rickmansworth, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints pointed up with cement by mistake
- Old sealant gone brittle and cracked
- Water getting into walls through failed joints
External mastic in Rickmansworth: local notes
Historic houses like Chenies Manor House (about 3.7 miles north-west) are a reminder that the area around Rickmansworth has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. 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.
Letting a property close to Rickmansworth station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. In the older streets around Church of St Mary, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Rickmansworth is about 3 miles south-west of Watford, in Hertfordshire. We carry out external mastic for homes and businesses in Rickmansworth. Our Hertfordshire coverage runs to 381 places, and Rickmansworth is one of them. You can also see our page for London, roughly 19 miles from Rickmansworth.
Here we cover the WD3 and WD18 postcode area for external mastic. If you need external mastic at a property on High Street, Station Road and London Road or anywhere close by, we can help. Main roads around Rickmansworth include the A404 and A412, which makes travel easy. Other places close to Rickmansworth include Batchworth (1 mile south), Chorleywood West (1 mile north-west), Croxley Green (1 mile north-east), Mill End (1 mile west) and Woodcock Hill (1 mile south). Within a short drive, we also cover Watford (3 miles north-east), Hemel Hempstead (8 miles north), St Albans (10 miles north-east), Harpenden (13 miles north), Hatfield (13 miles north-east) and Borehamwood (8 miles east).
Around Rickmansworth
We work in homes and buildings around Rickmansworth Park Junior Mixed and Infant School, Rickmansworth Park and The Coach And Horses Public House, among other places. Rickmansworth has its own railway station: Rickmansworth station. Well-known places in the area include Chiltern Open Air Museum (3.2 miles west) and Charter Place (3.2 miles east). Green spaces nearby include Chorleywood Common and Tumbling Bay.
External mastic in Rickmansworth
For buildings in Rickmansworth, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. If you’re dealing with movement joints filled with mortar instead of sealant and movement joints with cracked, split or missing sealant, we can put it right.
Garage door frames, porches and roofline trims are all part of external work in a town like Rickmansworth. Each joint between different materials moves in its own way, so the sealant has to cope with that.
All our work comes with our one-year guarantee, wherever you are in Hertfordshire.
- Location
- Rickmansworth (WD3, WD18)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- The product the joint needs
- How easy the joints are to reach
- How many areas need sealing
- How much old sealant there is and how hard it is to remove
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Helping us quote
To make quoting easier, let us know:
- Photos by email, if that’s easy
- Whether it’s a home or a business
- The address or postcode of the job
- How many joints, rooms or windows are involved
For external mastic in Rickmansworth, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before any work starts.
Rickmansworth questions
Is Rickmansworth in your area for external mastic?
Yes, Rickmansworth is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
I let a flat near Rickmansworth station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Can I do it myself?
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.
What colours does the sealant come in?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before any work starts, matched as closely as the range allows.
When will the joints need doing again?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away and have them redone then.
What information do you need?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and you’ll get one quote.
Can you reach joints on upper floors?
Each building is different. Tell us the height, the number of joints and what’s below them and we will confirm how they can be reached safely.
Common problems we fix in Rickmansworth
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
Any of these means the joints need attention:
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
- Hard, crazed mastic that has stopped moving
- Leaking joints around cladding and façade panels
Schools such as Saint Joan of Arc Catholic School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- Are they insured?
- How much experience the applicator has
- Which sealant they’ll use, and why
- How the joint is cleaned and prepared
Why it’s worth doing now in Rickmansworth
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Black mould and gaps in sealant don’t fix themselves, and in a busy household in Rickmansworth they spread with every shower and every downpour. Replacing the sealant now is the simplest fix.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Why Rickmansworth clients choose us
- Anti-fungal silicone where joints get wet
- Arbo and Everbuild products
- Domestic, commercial and hotel work
- White, clear, grey or another colour, product permitting
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Surface by surface
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so neither cracks the other.
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Keep soil, plants and ivy away from the joints
- Deal with leaking gutters that soak the joints below
- Wash walls gently around the sealant
- Look over the joints every year, ideally after winter
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
Also near Rickmansworth
Other services in Rickmansworth
What happens on the day
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours to a few days, depending on the length of joint and the access. For a job in Rickmansworth, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Clear items away from the joints we are working on
- Where the joints are inside, avoid wetting them before we arrive
- For business premises, tell us about site rules or sign-in
Ask for a quote
Want a quote for external mastic? Please ring 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear quote before we start.