Hertfordshire · England
Apsley External Mastic
We cover Apsley for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Weeds or debris growing in open joints
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
How we handle external mastic in Apsley
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two where mortar or filler would crack. If you have weathered mastic that no longer stretches and sealant that has lost its bond to the brick or render, we can put it right, whatever the surface.
Homes around Apsley range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
A 12-month guarantee comes as standard, so you’re covered after we have gone.
- Location
- Apsley (HP3, HP1, HP2)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
A few problems are outside what sealant work can do:
- Subsidence or other structural problems
- Rising or penetrating damp from elsewhere in the wall
- Cracking across the wall rather than at a joint
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in Apsley
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
- Copings & trims
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way, and access only has to be arranged once. In a smaller place like Apsley, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Why Apsley clients choose us
- Full insurance on every job
- Colour picked to suit the job
- 180+ five-star Google reviews
- Colour agreed with you before any work starts
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Apsley: your questions answered
Do you work for landlords with property near Apsley station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Is it worth replacing old sealant in an older home in Apsley?
Normally, yes, if it’s cracked, shrunk, mouldy or coming away. The key is cutting all the old sealant out, as new sealant will not bond to it.
Do you do commercial work?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Do you work in Apsley?
We do. Apsley is part of the area we cover.
How long does the job take?
A typical job takes a few hours to a few days, depending on the length of joint and the access, including the preparation. We’ll confirm how long when we quote.
Can you seal joints between render and window frames?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
What external mastic looks like in Apsley
With historic houses such as High Elms Manor (about 4.1 miles south-east) nearby, there’s older building stock in the area around Apsley as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. 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.
For site and facilities teams at buildings such as Two Waters Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. High Elms Manor, about 4.1 miles south-east, is one of the historic houses in the wider area around Apsley. For landlords with property near Apsley station, outside joints that have cracked can let damp into a rental, so check them between lets.
Apsley is about 1 mile south of Hemel Hempstead, in Hertfordshire. We provide external mastic to homes and businesses in Apsley. 381 places in Hertfordshire are on our list, from the larger towns to small villages. London is on our list too, about 23 miles from Apsley.
Work in HP3, HP1 and HP2 is quoted and booked the same way as anywhere else. Whether your property is on Lawn Lane, Avocet Road and Linnet Road or a nearby road, we can help. Neighbouring places we cover for external mastic include Felden (1 mile south-east), Boxmoor (1 mile north-west), Bennetts End (1 mile east), Nash Mills (1 mile south-east) and Grovehill (1 mile north). Further out, we also cover Watford (6 miles south-east), St Albans (6 miles east), Welwyn Garden City (13 miles east), Harpenden (8 miles north-east), Hatfield (10 miles east) and Borehamwood (10 miles south-east).
What’s near Apsley
Around Apsley, our work takes us to homes and buildings near Gadebridge Park, The Hemel Hempstead School and The Oddfellows Arms and the streets around them. The nearest railway station is Apsley station, roughly 0.5 miles south-east of the centre. Nearby you’ll also find Hemel Hempstead Hospital (0.9 miles north). The countryside around Apsley includes Long Deans.
What affects the quote in Apsley
Call for a quick quote. What matters most is:
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- How much there is to do
- Any working-time requirements on site
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- How we’d reach the joints
- The address or postcode of the job
- The type of property
- Photos by email, if that is easy
We quote each job on its own. Simply call 0345 464 0079 or email us and describe the job and send pictures if you have them.
What happens on the day
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to several days, depending on the building from start to finish. In a smaller place like Apsley, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- 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
- Mention any tricky access
- Mention if the joints have been sealed before
- For business premises, tell us about site rules or sign-in
Get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or send us an email.
Related advice
Surface by surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.