Hertfordshire · England
Little Wymondley External Mastic
Movement joints in Little Wymondley need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Brick movement joints where the sealant has split
- Moss and dirt in joints with no sealant left
- Failed sealant between panels on a façade
Leave it or put it right?
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, rather than the wall around it. Where a wall is exposed, as many are in small places like Little Wymondley, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why choose Mr Mastic in Little Wymondley
- We leave the area clean and tidy
- Colour agreed with you before we start
- Sealant colour chosen to suit
- More than 20 years in sealant work
Take a look at what affects the cost and what customers say.
External mastic for homes and businesses in Little Wymondley
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We strip the joint back and start again. If you are dealing with sealant that has lost its bond to the brick or render and joints pointed up with cement by mistake, we can help, on concrete & block, render & cladding joints and façade panels alike.
Somewhere as small as Little Wymondley, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
Every job comes with our 12-month guarantee, wherever you are in Hertfordshire.
- Where
- Little Wymondley (SG4)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Little Wymondley questions
Can you help a landlord with a rental near Hitchin station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Can you do external mastic in Little Wymondley?
Yes. We work across London and the South East, and Little Wymondley is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear quote.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
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.
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.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Is the work guaranteed?
Yes: twelve months. If anything isn’t right with the work within the year, let us know and we’ll sort it.
Are you fully insured?
Yes. We are fully insured for every job we do.
What we do, step by step
At the end, we look at the finished work together. The visit itself usually takes a few hours for a handful of joints, longer for a whole elevation, depending on how much there is to do. For a village or hamlet like Little Wymondley, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
- For business premises, tell us about site rules or sign-in
Get a quote
For a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
Related advice
Do you need external mastic in Little Wymondley?
Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, and it tears off the sides.
People normally contact us after spotting something like this:
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
- Sealant that has lost its bond to the brick or render
- Rain getting behind render or cladding at a joint
Schools such as Wymondley Junior Mixed and Infant School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- What happens if the job turns out different
- Who turns up on the day
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
Honest limits
A few problems are outside what sealant work can do:
- Movement that is more than a sealant joint can take
- Adding movement joints to masonry that has none
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Where we work in Little Wymondley
- Concrete & block
- Façade panels
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
Walls and rooflines in Little Wymondley
Rainfall in the South East is lower than in much 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 Knebworth House (about 4.2 miles south) nearby, there’s older building stock in the area around Little Wymondley as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Homes close to Church of St Mary the Virgin include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. Rented homes near Hitchin station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Little Wymondley is about 2 miles south-east of Hitchin, in Hertfordshire. We carry out external mastic for householders, landlords and businesses in Little Wymondley. Our Hertfordshire coverage runs to 381 places, Little Wymondley among them. For nearby work, see our London page.
All of SG4 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on St Marys Church Road, Elms Close and Stevenage Road or anywhere close by, we can help. Other places close to Little Wymondley include Titmore Green (1 mile south), Lower Titmore Green (1 mile south), Great Wymondley (1 mile north), Todd's Green (1 mile south-east) and St Ippolyts (1 mile west). Within a short drive, we also cover Stevenage (3 miles south-east), St Albans (13 miles south), Welwyn Garden City (9 miles south), Harpenden (9 miles south-west), Hoddesdon (15 miles south-east) and Hatfield (12 miles south).
Near you in Little Wymondley
We work in homes and buildings around Kingshott School, The John Henry Newman School and The Bucks Head Public House, among other places. Little Wymondley’s nearest station is Hitchin station, roughly 1.8 miles north-west of the centre. Other landmarks nearby include Lister Hospital (1.2 miles south-east) and Wymondley Castle (0.6 miles north). Open spaces near Little Wymondley include Purwell Ninesprings.
Surface by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
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. Several properties can go on one quote.
For anyone letting property in or around Little Wymondley, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
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.