Hertfordshire · England
External Mastic in Furneux Pelham
We cover Furneux Pelham for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly.
- Brick movement joints where the sealant has split
- Panel joints letting water in
- Rigid filler in a joint that should flex
The process
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes a few hours for a handful of joints, longer for a whole elevation, including the tidy-up. In a small place like Furneux Pelham, access is generally the main thing to plan. 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.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Keep children and pets away from the work area
- Tell us if parking is tricky
Get a quote
Need a quote? Please phone 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and send you a clear quote before any work starts.
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External mastic in Furneux Pelham
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. If you have panel joints letting water in and water getting into walls through failed joints, we can put it right, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Furneux Pelham is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
A 12-month guarantee comes as standard.
- Where
- Furneux Pelham (SG9)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Also near Furneux Pelham
Other services in Furneux Pelham
Signs you need external mastic in Furneux Pelham
Some movement joints have been pointed up with mortar by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
It’s worth asking for a quote if you see:
- Sealant pulling away from one side of the joint
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Rigid filler in a joint that should flex
Homes close to Church of St Mary include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
What your quote should include
- What guarantee comes with the work
- How much experience the applicator has
- How the colour is chosen
- When the joint can take water or movement
What sealant work can’t fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Cracked brickwork or render that needs a builder or plasterer
- Adding movement joints to masonry that has none
- Subsidence or other structural problems
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Joints between brick and frames
Common questions in Furneux Pelham
Is Furneux Pelham in your area for external mastic?
Yes, Furneux Pelham is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Is external mastic in Furneux Pelham guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Can you seal joints between two different materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
Are you insured?
Yes. We are fully insured, and we can confirm the details when we quote.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Will the old sealant be removed?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Furneux Pelham buildings and the weather
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.
For site and facilities teams at buildings such as Furneux Pelham Church of England School, its movement joints, gutters and trims need looking after like any other building’s.
Furneux Pelham is about 5 miles north-west of Bishop's Stortford, in Hertfordshire. Across the SG9 area, we can carry out external mastic at your property. Across Hertfordshire, we cover 381 places, and Furneux Pelham is one of them. For nearby work, see our Chelmsford page (22 miles or so).
Work in SG9 works the same way as everywhere else we cover. Local streets include The Street and The Causeway, all of which we cover. We also cover the places around Furneux Pelham: Albury (1 mile south), Gravesend (2 miles south), Brent Pelham (2 miles north), Clapgate (2 miles south) and Great Hormead (2 miles north-west). Further out, we also cover Stevenage (11 miles west), Bishop's Stortford (5 miles south-east), Welwyn Garden City (15 miles south-west), Hitchin (15 miles west), Hoddesdon (13 miles south) and Hertford (11 miles south-west).
Near you in Furneux Pelham
We work in homes and buildings around The Star Public House and the streets around them. A little further out are Brent Pelham (2.1 miles north).
Quotes for external mastic in Furneux Pelham
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How easy the joints are to reach
- The number and length of the joints
- How many areas need sealing
- Any working-time requirements on site
Leaving a failed joint usually makes the job bigger, not smaller. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- A few photos by email, if you can
- How many joints, rooms or windows are involved
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll take it from there.
Different surfaces, different methods
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
Landlord and commercial work in Furneux Pelham
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.