Hertfordshire · England
External Mastic in Micklefield Green
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Micklefield Green. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Water getting into walls through failed joints
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
External mastic in Micklefield Green
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing, and we do not skip that step. Typical jobs include cracked joints where brick meets render or frames and panel joints letting water in, across copings & trims, concrete & block and brickwork movement joints.
Around Micklefield Green, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water normally gets in, and they need the right sealant at the right depth.
Whatever the size of the job, you get the same one-year guarantee in Micklefield Green and across Hertfordshire.
- Place
- Micklefield Green (WD3)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for external mastic
The price is agreed before any work begins. It takes into account:
- Whether the work is at height
- Mould in or behind the old joints
- The size of the job
- The old material and how stubborn it is
The cost depends on how much there is to do, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
What to tell us for a quote
You don’t need to know the technical terms. Just tell us:
- The problem you’ve noticed
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
- If someone has resealed it before
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or email us.
What the job involves on each surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap and keep the sealant to the right depth.
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Common questions in Micklefield Green
Will you come out to Micklefield Green?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is Micklefield Green in your area for external mastic?
Yes. Our work covers London and the South East, and Micklefield Green is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
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 we start, matched as closely as the range allows.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
What does external mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we’re using.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Every job carries our one-year guarantee.
How it works
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Somewhere like Micklefield Green needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
Getting a quote
If you are in Micklefield Green and need external mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
Read more
Towns and villages near Micklefield Green
Other services in Micklefield Green
Why act early in Micklefield Green
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. Where a wall is exposed, as many are in small places like Micklefield Green, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why choose Mr Mastic in Micklefield Green
- 4.9 on Google from 180+ five-star reviews
- Neat joints and a tidy finish
- Quality sealants from Arbo and Everbuild
- Full insurance on every job
Read our cost guide and what customers say.
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
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.
Should I try it myself first?
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.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Micklefield Green buildings and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Chenies Manor House (about 2 miles west) nearby, there’s older building stock in the area around Micklefield Green as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as Sarratt Church of England Primary School, its movement joints, gutters and trims need looking after like any other building’s. For an older house near a landmark such as Church of the Holy Cross, an extension built onto an older house moves differently, and the joint between them takes the strain. Letting a property close to Chorleywood station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Micklefield Green is about 3 miles north of Rickmansworth, in Hertfordshire. For external mastic in and around Micklefield Green, please ring 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Hertfordshire. Our Hertfordshire coverage runs to 381 places, and Micklefield Green is one of them. We also work in London, about 21 miles from Micklefield Green.
Every address in WD3 is covered for external mastic, from the main roads to the quietest streets. We also cover Sarratt (1 mile north-west), Chandler's Cross (1 mile east), Loudwater (1 mile south), Bucks Hill (1 mile north) and Chorleywood West (2 miles south). We also work in nearby towns such as Watford (4 miles east), Hemel Hempstead (6 miles north), St Albans (9 miles north-east), Welwyn Garden City (15 miles north-east), Harpenden (11 miles north-east) and Hatfield (12 miles north-east).
Landmarks near Micklefield Green
Typical jobs here are in homes near St Clement Danes School, York House School and The Cock Public House. The closest station to Micklefield Green is Chorleywood station, roughly 2 miles south-west. Well-known places in the area include Leavesden Hospital (3.9 miles north-east) and Chiltern Open Air Museum (3.6 miles south-west). Green spaces nearby include Tumbling Bay and Chorleywood Common.
Honest limits
Before you book, it’s worth knowing the limits too:
- Failed render or damaged cladding panels
- Walls that need new movement joints cut into them
- Cracking across the wall rather than at a joint
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels