Hertfordshire · England
External & façade joints in St Ibbs, Hertfordshire
Problem with your movement joints in St Ibbs? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Movement joints filled with mortar instead of sealant
- Moss and dirt in joints with no sealant left
External mastic for homes and businesses in St Ibbs
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing, and we do not skip that step. If you have rigid filler in a joint that should flex and hard, crazed mastic that has stopped moving, we can help, whatever the surface.
Around St Ibbs, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Where
- St Ibbs (SG4)
- Wider area
- Hertfordshire
- Cover
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Make sure movement joints aren’t pointed over
- Ask before painting over external sealant
- Tell anyone working on the walls about the movement joints
- Avoid pressure-washing directly into sealant joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
St Ibbs buildings and the weather
With historic houses such as Knebworth House (about 4.1 miles south-east) nearby, there’s older building stock in the area around St Ibbs as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like St Ippolyts Church of England Aided Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. Rented homes near Hitchin station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
St Ibbs is about 2 miles south of Hitchin, in Hertfordshire. Anywhere in SG4, we can carry out external mastic at your property. Across Hertfordshire, we cover 381 places, St Ibbs among them. For nearby work, see our London page, about 30 miles away.
All of SG4 is covered for external mastic, from the main roads to the quietest streets. If you are just outside St Ibbs, we cover Sperberry Hill (1 mile north-east), Little Almshoe (1 mile south), St Ippolyts (1 mile north-east), Gosmore (1 mile north-west) and Titmore Green (1 mile east). Within a short drive, we also cover Hemel Hempstead (15 miles south-west), Stevenage (4 miles east), St Albans (12 miles south), Welwyn Garden City (9 miles south), Harpenden (8 miles south-west) and Hatfield (11 miles south).
Around St Ibbs
Around St Ibbs, our work takes us to homes and buildings near Hitchin Girls' School, The Bull Public House and Kingshott School and the streets around them. For rail, the closest station is Hitchin station, roughly 1.9 miles north of the centre. Well-known places in the area include Lister Hospital (2.1 miles east) and North Hertfordshire Museum (1.8 miles north). Not far away are Purwell Ninesprings and Markham's Hill.
Your questions about external mastic in St Ibbs
Do you cover smaller places like St Ibbs?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover St Ibbs for external mastic?
Yes, St Ibbs is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we will send you a clear quote.
Do you work at height?
It depends on the building. Tell us the height, the number of joints and what’s below them.
Can landlords and businesses book you?
Yes, regularly. We can quote for several properties at once.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
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.
Quotes for external mastic in St Ibbs
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How many areas need sealing
- The size of the job
- How easy the joints are to reach
- Mould in or behind the old joints
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Whether it’s a home or a business
- How we’d reach the joints
- Whether it has been sealed before
- Pictures of the joints, sent by email
If you are in St Ibbs and need external mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
What the job involves on each surface
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so neither cracks the other.
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Common problems we fix in St Ibbs
If plants are growing out of a joint, the sealant has usually failed or was never there. Roots and dirt hold water against the wall.
Any of these means the joints need attention:
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
In the older streets around Church of St Ippolyts (church of England), older walls, gutters and the joints where extensions meet them need a flexible sealant.
Questions to ask before booking
- Who turns up on the day
- Which colour the sealant will be
- How the joint is cleaned and prepared
- The length of the guarantee
What happens if it’s left?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render near the open joint, so the damage spreads beyond the joint. Around St Ibbs, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Why St Ibbs clients choose us
- Quality sealants from Arbo and Everbuild
- 20+ years of sealant experience
- Fully insured
- 4.9 on Google from 180+ five-star reviews
Read how sealant jobs are priced or our reviews.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The process
When we arrive, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints 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 St Ibbs, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Keep pets and children clear of the area while we work
Get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.