Hertfordshire · England
External & façade joints in Loudwater, Hertfordshire
Movement joints in Loudwater need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Damp patches traced to an open external joint
- Joints with sealant missing in places
- Panel joints letting water in
The process
We keep the work tidy and contained to the area we are working on. The job normally takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Somewhere as small as Loudwater, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- On commercial sites, let us know about site rules
- For indoor joints, keep the area dry beforehand if you can
- Let us know about parking restrictions
How to get a quote
For external mastic in Loudwater, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before any work starts.
Related advice
External mastic in Loudwater
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what access is needed. Common call-outs are for cracked joints where brick meets render or frames and plants rooting in failed movement joints, on brickwork movement joints, joints between brick and frames and copings & trims.
Somewhere as small as Loudwater, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
There’s a 12-month guarantee on every job.
- Location
- Loudwater (WD3)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
What the job involves on each surface
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. A primer goes on where the product requires one before sealing.
Places near Loudwater
More services for Loudwater
What affects the cost of external mastic
We don’t publish a price list. The quote depends on:
- Access and height
- How much old sealant there is and how hard it is to remove
- Any working-time requirements on site
- The number and length of the joints
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and give you a clear price before work begins.
What to tell us for a quote
When you call or email, it’s useful to know:
- Roughly how big the job is
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.
Your questions about external mastic in Loudwater
Do you cover Loudwater for external mastic?
Yes, Loudwater is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear price.
Do you work for landlords with property near Rickmansworth station?
Yes. We work for landlords and letting agents as well as homeowners. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Can a movement joint be filled with mortar?
No. Cement or mortar can’t stretch and the joint fails. If it has already been filled, we can usually cut it out and reseal it.
How long before the joint can be used?
Cure times vary by product. Before we leave, we will tell you the cure time.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
How long does external mastic take?
That depends on how much there is to do, but as a guide it takes anything from a few hours to several days, depending on the building. We’ll tell you when we quote.
Can you reach joints on upper floors?
It depends on the building. Where joints can be reached safely, we’ll do them. Tell us about the building and we’ll confirm what access is needed.
For landlords and businesses
If you manage several properties in or around Loudwater, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Show decorators and builders where the movement joints are
- Walk round the building once a year and look at the joints
- Keep water from gutters off the wall
- Wash walls gently around the sealant
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
When to call us in Loudwater
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
Common reasons people contact us are:
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
- Cracked joints where brick meets render or frames
- Brick movement joints where the sealant has split
For landlords with property near Rickmansworth station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Before booking anyone
- How the colour is chosen
- How the surfaces are prepared before sealing
- Are they insured?
- Which sealant they’ll use, and why
Walls and rooflines in Loudwater
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Chenies Manor House (about 2.5 miles north-west) nearby, there’s older building stock in the area around Loudwater as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
In the older streets around Christ Church, older walls, gutters and the joints where extensions meet them need a flexible sealant. For site and facilities teams at buildings such as Christ Church Chorleywood CofE School, its movement joints, gutters and trims need looking after like any other building’s.
Loudwater is about 1 mile north-east of Chorleywood, in Hertfordshire. From the centre of Loudwater to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Hertfordshire coverage runs to 381 places, and Loudwater is one of them. For nearby work, see our London page, about 20 miles away.
Here we cover the WD3 postcode area for external mastic. Whether your property is on Chess Lane, Bridle Lane and Sarratt Lane or anywhere close by, we can help. Close by, we work in Chorleywood West (1 mile south), Micklefield Green (1 mile north), Rickmansworth (1 mile south-east), Mill End (2 miles south) and Chandler's Cross (2 miles north-east). Within a short drive, we also cover Watford (4 miles east), Hemel Hempstead (7 miles north), St Albans (9 miles north-east), Harpenden (12 miles north-east), Hatfield (13 miles north-east) and Borehamwood (9 miles east).
Around Loudwater
Around Loudwater, our work takes us to homes and buildings near Saint Joan of Arc Catholic School, Rickmansworth Park and York House School, among other places. For rail, the closest station is Rickmansworth station, about 1.2 miles south. Well-known places in the area include Bishops Wood Hospital (3.2 miles south-east) and Chiltern Open Air Museum (3 miles south-west). Open spaces near Loudwater include Tumbling Bay and Chorleywood Common.