Hertfordshire · England
External & façade joints in Great Gaddesden, Hertfordshire
We cover Great Gaddesden for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Failed sealant between panels on a façade
- Movement joints filled with mortar instead of sealant
- Cracked joints where brick meets render or frames
External mastic in Great Gaddesden, done properly
Low-level joints can usually be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. We work on concrete & block, copings & trims and brickwork movement joints, and people most often call us about leaking joints around cladding and façade panels and joints with sealant missing in places.
External sealant needs dry, clean surfaces, so work around Great Gaddesden is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Every job is covered by our 12-month guarantee.
- Place
- Great Gaddesden (HP1)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
When we arrive, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Great Gaddesden, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Tell us about any water getting in
- Mention any parking rules near the property
- Let us know about earlier repairs to the joints
Getting a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or email us.
Advice
Landlords, agents and businesses in Great Gaddesden
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
Why act early in Great Gaddesden
Water gets in through a failed movement joint and can run behind render or cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. Around Great Gaddesden, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- Trusted Arbo and Everbuild sealants
- 4.9 on Google from 180+ five-star reviews
- We’re fully insured
- Anti-fungal silicone where joints get wet
Read how sealant jobs are priced and our reviews.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Failed render or damaged cladding panels
- Structural movement, which needs a surveyor or engineer
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Façade panels
What the job involves on each surface
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it.
What we are called out for in Great Gaddesden
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
If you can see any of these, it’s time to have the joints looked at:
- Joints pointed up with cement by mistake
- Gaps where render, brick and frames meet
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
For landlords with property near Berkhamsted station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What to look for in a quote
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
- How long the guarantee is
- What the quote includes, VAT included or not
Also near Great Gaddesden
What else we do in Great Gaddesden
Outside joints around Great Gaddesden
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Great Gaddesden Church of England Primary School, larger buildings have long runs of movement joint that eventually need resealing. If you live in an older home near Church of St John the Baptist, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Great Gaddesden is about 3 miles north-west of Hemel Hempstead, in Hertfordshire. For external mastic in and around Great Gaddesden, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We are based in Crawley and cover Hertfordshire, Great Gaddesden included. Great Gaddesden is one of 381 towns and villages in Hertfordshire where we work for external mastic. There’s also a page for London, about 27 miles away.
Here we cover the HP1 postcode area for external mastic. External mastic is available to properties on Church Meadow, Piper's Hill and Dagnall Road. Neighbouring places we cover for external mastic include Nettleden (1 mile south-west), Frithsden (1 mile south-west), Potten End (2 miles south-west), Fields End (2 miles south) and Ashridge (2 miles west). We also work in nearby towns such as Watford (10 miles south-east), Hemel Hempstead (3 miles south-east), St Albans (8 miles east), Welwyn Garden City (14 miles east), Harpenden (7 miles east) and Hitchin (15 miles north-east).
Around Great Gaddesden
Typical jobs here are in homes near John F Kennedy Catholic School and The Crown and Sceptre pub and the streets around them. For rail, the closest station is Berkhamsted station, roughly 3 miles south-west of the centre. Nearby you’ll also find Hemel Hempstead Hospital (3.2 miles south-east). For a walk, there’s Landpark Wood.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Great Gaddesden: your questions answered
Do you work for landlords with property near Berkhamsted station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Is Great Gaddesden within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Do you seal joints where cladding meets other materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. The sealant is matched to both sides.
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 so it can flex with the joint.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
Should I point up the gap in my brickwork?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Can I add another job to the visit?
Of course. Doing several areas at once is generally more efficient.