Hertfordshire · England
External Mastic in Smallford
External mastic in Smallford from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Joints where the bead has come unstuck
- Joints pointed up with cement by mistake
- Water getting into walls through failed joints
FAQs for Smallford
Can you help a landlord with a rental near Hatfield station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Is it worth replacing old sealant in an older home in Smallford?
In most cases, yes, if it hasn’t been done for a while. Sealant is a maintenance item: how long it lasts depends on use, cleaning and exposure, and many homes in Smallford may already be on their second or third set.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
What does external mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
Can you reach joints on upper floors?
Each building is different. Tell us the height, the number of joints and what’s below them, and we will confirm what access is needed.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
How we handle external mastic in Smallford
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing. We’re often asked to deal with moss and dirt in joints with no sealant left and leaking joints around cladding and façade panels, on façade panels, concrete & block and brickwork movement joints.
External sealant needs dry, clean surfaces, so work around Smallford is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Where
- Smallford (AL4)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Outside joints around Smallford
Smallford is part of Hatfield, one of the post-war new towns. Homes here were built in phases, many of them in the post-war decades, so whole streets can have gutters, trims and wall joints reaching the end of their life together. With historic houses such as Hatfield House (about 2.7 miles east) nearby, there’s older building stock in the area around Smallford as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For site and facilities teams at buildings such as Nicholas Breakspear Catholic School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Church of St Mark, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Smallford is about 2 miles west of Hatfield, in Hertfordshire. Jobs in Smallford get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. We cover 381 towns and villages across Hertfordshire, large and small. For nearby work, see our London page.
We work across AL4 for external mastic and the streets around it. External mastic is available to properties on Jove Gardens, Lawrence Close and Oaklands Lane. Nearby, we also carry out external mastic in Sleapshyde (1 mile south-east), Cooper's Green (1 mile north), Jersey Farm (1 mile north-west), Colney Heath (1 mile south-east) and Tyttenhanger (2 miles south-west). Within a short drive, we also cover Watford (8 miles south-west), Hemel Hempstead (8 miles west), Stevenage (11 miles north), Welwyn Garden City (4 miles north-east), Harpenden (5 miles north-west) and Hitchin (13 miles north).
Around Smallford
We work in homes and buildings around Three Horseshoes Public House, Highfield Park and Colney Heath Junior Mixed Infant and Nursery School. The closest station to Smallford is Hatfield station, about 2.4 miles east of the centre. Nearby you’ll also find Hill End Hospital (1.4 miles south-west) and The Bunker at Hatfield Police Station (1.5 miles north-east). Open spaces near Smallford include Verulamium Lake and Colney Heath Local Nature Reserve.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Rising or penetrating damp from elsewhere in the wall
- Cracking across the wall rather than at a joint
- Adding movement joints to masonry that has none
If you’re not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
What we seal
- Concrete & block
- Joints between brick and frames
- Façade panels
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
Why deal with it now?
A failed movement joint lets water into the wall. Resealing early keeps the job to the joint itself, rather than the wall around it. Where a wall is exposed, as many are in small places like Smallford, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
Why book with us
- Fully insured
- A choice of colours where the product allows
- Experience in homes, commercial sites and hotels
- A 12-month guarantee on all work
Read what affects the cost and customer reviews.
Signs you need external mastic in Smallford
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
People generally contact us when they notice one of these:
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
- Joints with sealant missing in places
- Cracked joints where brick meets render or frames
Letting a property close to Hatfield station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
What your quote should include
- Whether they’re fully insured
- What happens if the job turns out different
- How long the guarantee is
- How long to leave it before use
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Clear growth from the base of walls and joints
- Avoid pressure-washing directly into sealant joints
- Point out the joints to other trades
- Check external joints each spring
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
Towns and villages near Smallford
Other services in Smallford
Different surfaces, different methods
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
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.
Quotes for external mastic in Smallford
Every job gets its own quote. These are the things that affect it:
- Whether there’s mould to deal with
- The type of sealant required
- The size of the job
- The old material and how stubborn it is
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and send you a clear quote before we start.
What to tell us for a quote
To help us quote quickly, please include:
- Any previous sealing or DIY work
- Where the job is, and your postcode
- The problem you’ve noticed
- Any access issues, like height or stairs
Want a quote for external mastic? Please phone 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.
How the visit works
You don’t need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the work takes a few hours to a few days, depending on the length of joint and the access in most cases. In a small place like Smallford, 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.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Let us know about stairs, lifts or work at height
- Keep children and pets away from the work area
Ask for a quote
There’s no standard price list. Instead, we give you a clear price for your job. To arrange one, call 0345 464 0079 or email us.