Hertfordshire · England
External Mastic in Nether Street
External mastic in Nether Street from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant pulling away from one side of the joint
- Weeds or debris growing in open joints
- Failed seals between different materials
How we handle external mastic in Nether Street
For buildings in Nether Street, 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 have movement joints filled with mortar instead of sealant and joints with sealant missing in places, we can help, on render & cladding joints, brickwork movement joints and copings & trims alike.
Somewhere as small as Nether Street, 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.
Every job is covered by a 12-month guarantee, wherever you are in Hertfordshire.
- Location
- Nether Street (SG12)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
We bring everything the job needs with us. Once we’ve agreed what’s being done, the area is protected and the work begins. It normally takes anything from a few hours to several days, depending on the building. In a small place like Nether Street, access is usually 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.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, phone 0345 464 0079 or send us an email.
Read more
Do you need external mastic in Nether Street?
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
If you can see any of these, it’s time to have the joints looked at:
- Hard, crazed mastic that has stopped moving
- Brick movement joints where the sealant has split
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
Homes close to Parish Church of St John the Baptist include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Before you book anyone
- What happens if they find a problem under the old sealant
- Which colour the sealant will be
- What product goes in the joint
- How the surfaces are prepared before sealing
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Deal with leaking gutters that soak the joints below
- Wash walls gently around the sealant
- Point out the joints to other trades
- Keep movement joints as flexible joints, not mortar
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.
How the job changes by surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap so the sealant is not too deep.
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner. Where a wall is exposed, as many are in small places like Nether Street, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we’ll explain what it covers.
Why Nether Street customers choose us
- White, clear, grey or coloured to suit, where the product allows
- Sealant colour chosen to suit
- We never seal over old sealant
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at what affects the cost or what customers say.
Also near Nether Street
Also in Nether Street
What external mastic looks like in Nether Street
With historic houses such as Much Hadham Palace (about 2.3 miles north) nearby, there’s older building stock in the area around Nether Street as well as newer homes. In older buildings, 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Harlow Town station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. Managing a site like Widford School? Then its movement joints, gutters and trims need looking after like any other building’s.
Nether Street is about 4 miles east of Ware, in Hertfordshire. We carry out external mastic for householders, landlords and businesses in Nether Street, as part of our work across Hertfordshire. Across Hertfordshire, we cover 381 places, Nether Street among them. There’s also a page for Chelmsford, about 19 miles away.
Work in SG12 works the same way as everywhere else we cover. Nearby, we also carry out external mastic in Widford (1 mile south-west), Hunsdon (1 mile south), Hadham Cross (2 miles north), Hunsdonbury (2 miles south) and Wareside (2 miles west). Within a short drive, we also cover Stevenage (12 miles north-west), Bishop's Stortford (5 miles north-east), Welwyn Garden City (11 miles west), Hoddesdon (6 miles south-west), Cheshunt (9 miles south-west) and Hatfield (13 miles west).
Landmarks near Nether Street
Around Nether Street, our work takes us to homes and buildings near The Bell Inn On The Corner Of Bell Lane and the streets around them. The nearest railway station is Harlow Town station, about 3.2 miles south of the centre. Well-known places in the area include Harlow Mill (3.5 miles south-east) and Henry Moore Studios and Gardens (1.2 miles north-east). Not far away are Hunsdon Mead.
Common questions in Nether Street
Will you come out to Nether Street?
Yes. Nether Street is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is Nether Street in your area for external mastic?
Yes. We work across London and the South East, and Nether Street is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
How long before the joint can be used?
Cure times vary by product. Before we leave, we’ll tell you the cure time.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
Can you seal joints between render and window frames?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is normally a movement joint. It lets the bricks expand without cracking.
Can you match the colour of my brickwork?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so the joint does not draw the eye.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Landlord and commercial work in Nether Street
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.