Hampshire · England
External & façade joints in North Street, Hampshire
We cover North Street for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Joints where the bead has come unstuck
- Weeds or debris growing in open joints
External mastic in North Street
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. Common call-outs are for plants rooting in failed movement joints and joints pointed up with cement by mistake, on copings & trims, façade panels and concrete & block.
Outside joints can only be sealed when they’re dry, so work in North Street is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Your job is guaranteed for a year, as with all our work.
- Location
- North Street (SO24)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best in all weathers.
Looking after it afterwards
After the cure time, these simple habits help:
- Fix overflowing gutters above sealed joints
- Clear growth from the base of walls and joints
- Have failed joints looked at early
- Avoid pressure-washing directly into sealant joints
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. 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.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
For landlords and businesses
Housing providers, facilities teams and property managers book us too in North Street and across Hampshire. We can quote a run of properties together, and we are fully insured for the work.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
FAQs for North Street
Is external mastic in North Street guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Can you do external mastic in North Street?
Yes, North Street is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear price.
I rent my home. Can I book you?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
What colours does the sealant come in?
We aim for a joint that suits the wall rather than one that jumps out. We will talk through colour options before we start from the range available.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
What is backing rod for?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
What we’re called out for in North Street
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
The most common problems we see are:
- Cracked joints where brick meets render or frames
- Water getting into walls through failed joints
- Leaking joints around cladding and façade panels
- Joints with sealant missing in places
For site and facilities teams at buildings such as Ropley Church of England Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- What happens if they find a problem under the old sealant
- What the cure time is
- How the surfaces are prepared before sealing
- How long the guarantee is
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Loose or hollow render, which needs re-rendering
- Damp that isn’t coming from the joint
- Adding movement joints to masonry that has none
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Joints and surfaces we work on
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Façade panels
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. Typically it takes anything from a few hours to several days, depending on the building. Somewhere as small as North Street, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
- Let us know about earlier repairs to the joints
Getting a quote
For external mastic in North Street, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
Read more
Places near North Street
What else we do in North Street
North Street buildings and the weather
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Bentworth Hall (about 3.9 miles north) nearby, there’s older building stock in the area around North Street as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you live in an older home near Church of St Peter, an extension built onto an older house moves differently, and the joint between them takes the strain.
North Street is about 6 miles south-west of Alton, in Hampshire. Homes, rented property, offices and hotels in North Street can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. North Street is one of 683 places in Hampshire we cover. For nearby work, see our Southampton page, about 18 miles away.
Jobs for external mastic in SO24 is quoted and booked the same way as anywhere else. If you are just outside North Street, we cover Gilbert Street (1 mile south-east), Ropley (1 mile south), Ropley Dean (1 mile south-west), Kitwood (1 mile east) and Charlwood (2 miles south-east). Larger places within reach include Basingstoke (12 miles north), Winchester (10 miles west), Eastleigh (14 miles south-west), Horndean (13 miles south), Chandler's Ford (15 miles south-west) and Alton (6 miles north-east).
Local landmarks in North Street
Nearby you will also find Barton Castle (3.3 miles north-west) and Alton Community Hospital (5.1 miles north-east). For a walk, there’s Shutts Copse and Red Hill.