Hampshire · England
External Mastic in Liss
Professional external mastic in and around Liss, with every bit of old sealant taken out first and a 12-month guarantee.
- Water getting into walls through failed joints
- Gaps where render, brick and frames meet
- Plants rooting in failed movement joints
External mastic for homes and businesses in Liss
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the joint does not stand out. If you have joints pointed up with cement by mistake and rain getting behind render or cladding at a joint, we can put it right, on render & cladding joints, concrete & block and brickwork movement joints alike.
Homes around Liss range from older cottages to newer houses, with walls and rooflines of every type. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Liss (GU33)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of external mastic
The price is agreed before any work begins. It takes into account:
- How much old sealant there is and how hard it is to remove
- The product the joint needs
- Any working-time requirements on site
- The amount of work
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
What to tell us for a quote
What to tell us when you ask for a quote:
- The address or postcode of the job
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
Need a quote? Please ring 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Towns and villages near Liss
More services for Liss
What we do, step by step
We bring everything the job needs with us, so you don’t need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the building. Parking around Liss is normally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Keep children and pets away from the work area
- Mention any parking rules near the property
- Where the joints are inside, avoid wetting them before we arrive
Ask for 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 and give you a clear quote.
Related advice
Questions from Liss
Will you come out to Liss?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you do external mastic in Liss?
Yes, Liss is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Liss and the rest of Hampshire.
Do you work for landlords and businesses?
Yes, we do. We work in homes, commercial premises and hotels.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall so the joint blends in. There’s a wide choice of exterior colours.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages to suit the site.
Do you work at height?
It depends on the height and the site. Ground-floor joints are simple; for higher work, tell us about the building and we’ll confirm what’s needed.
Why act early in Liss
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Around Liss, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What you get with us
- White, clear, grey or another colour, product permitting
- A sealant colour to suit the surroundings
- Every job guaranteed for a year
- Full insurance on every job
Take a look at what affects the cost and customer reviews.
Walls and rooflines in Liss
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain. If you look after a building such as Liss Infant School, larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Liss station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Liss is about 3 miles north-east of Petersfield, in Hampshire. If you need external mastic in Liss, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We’re based in Crawley and cover Hampshire. Our area takes in 683 places across Hampshire, from the larger towns to small villages. There’s also a page for Portsmouth, about 18 miles away.
All of GU33 is within our area for external mastic, from the main roads to the quietest streets. Streets in the area include Station Road, Shotterfield Terrace and Greenfields, and we cover them all. We also cover West Liss (1 mile south-west), The Mint (1 mile north-east), Liss Forest (1 mile north), Hill Brow (1 mile south-east) and Durford Wood (1 mile south). Larger places within reach include Havant (13 miles south), Horndean (11 miles south-west), Aldershot (15 miles north), Alton (8 miles north-west), Waterlooville (13 miles south-west) and Petersfield (3 miles south-west).
What’s near Liss
In Liss, that means homes and buildings near Whistle Stop pub and the streets around them. Liss has its own railway station: Liss station. Nearby you’ll also find Petersfield Community Hospital (3.6 miles south-west) and Bear Museum (3.5 miles south-west). Not far away are Liss Riverside Railway Walk South and Wheatham Hill.
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Adding movement joints to masonry that has none
- Render that is blown, hollow or coming away
- Cracks in the bricks or render themselves, away from the joints
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Façade panels
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What the job involves on each surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap so the sealant isn’t too deep.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
We also work for property managers and facilities teams in Liss and across Hampshire. Several sites can be quoted together, and we’re fully insured.