Hertfordshire · England
External Mastic in Ridge
External mastic in Ridge from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Movement joints filled with mortar instead of sealant
- Sealant pulling away from one side of the joint
- Weeds or debris growing in open joints
The process
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. In a small place like Ridge, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Keep children and pets away from the work area
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
Get a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll talk you through the work.
Read more
How we handle external mastic in Ridge
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. Typical jobs include weathered mastic that no longer stretches and joints with sealant missing in places, on copings & trims, render & cladding joints and concrete & block.
Somewhere as small as Ridge, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or drop us an email.
- Location
- Ridge (EN6)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Leave it or put it right?
Water gets in through a failed movement joint. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Older cottages and farmhouses around Ridge can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What you pay reflects the work, not guesswork. That is why we ask a few questions first and agree the price before starting.
Why book with us
- ARBOMaster approved applicator
- A 12-month guarantee on all work
- Sealant colour chosen to suit
- You choose the colour before work begins
Read what affects the cost and what customers say.
Walls and rooflines in Ridge
With historic houses such as Wyllyotts Manor (about 2.2 miles east) nearby, there’s older building stock in the area around Ridge as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Potters Bar station, split movement joints are easy to miss on a rental until damp shows inside. Schools such as St Giles' CofE Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Ridge is about 2 miles north-east of Borehamwood, in Hertfordshire. Wherever you are in the EN6 postcode area, our applicators can take on external mastic. We cover 381 towns and villages across Hertfordshire, from the larger towns to small villages. London is on our list too, around 15 miles away.
Our applicators cover all of the EN6 postcode area for external mastic. You’ll find streets such as Crossoaks Lane, Deeves Hall Lane and Blanche Lane, all of which we cover. Other places close to Ridge include South Mimms (1 mile north-east), Dancers Hill (1 mile south-east), Well End (1 mile south), Green Street (2 miles south-west) and Shenley (2 miles west). Further out, we also cover Watford (7 miles west), Hemel Hempstead (10 miles north-west), Stevenage (15 miles north), St Albans (6 miles north-west), Welwyn Garden City (8 miles north) and Harpenden (10 miles north-west).
Around Ridge
Typical jobs here are in homes near Manor Lodge School, Dame Alice Owen's School and North Mimms Park and the streets around them. The nearest railway station is Potters Bar station, about 2.3 miles east of the centre. Well-known places in the area include Hilfield Castle (4.6 miles south-west) and Hertfordshire Scout Museum (1.4 miles south-west). Green spaces nearby include Darland's Lake and Furzefield Wood and Lower Halfpenny.
Signs you need external mastic in Ridge
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
People normally contact us after spotting something like this:
- Panel joints letting water in
- Water getting into walls through failed joints
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
In the older streets around Church of St Margaret, an extension built onto an older house moves differently, and the joint between them takes the strain.
Questions to ask before booking
- When the joint can take water or movement
- Whether the sealant suits the joint
- How much experience the applicator has
- Is the old sealant removed completely?
More services for Ridge
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Common questions in Ridge
Can you help a landlord with a rental near Potters Bar station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Is Ridge within the area you cover?
Yes, Ridge is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back so the bead can stretch.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Do you work at height?
It depends on the building. Tell us the height, the number of joints and what’s below them and we will confirm how they can be reached safely.
How do I get a quote for external mastic in Ridge?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we’ll talk you through it.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Surface by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it.
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so neither cracks the other.
Landlord and commercial work in Ridge
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Landlords and agents in Ridge can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Keeping the joints in good condition
So the new joints stay in good condition:
- Fix overflowing gutters above sealed joints
- Get split or bare joints resealed while the damage is small
- Wash walls gently around the sealant
- Do not let climbing plants root in the sealant
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.