Hertfordshire · England
Chipping External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Chipping and across Hertfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
- Joints with sealant missing in places
External mastic in Chipping
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the joint does not stand out. If you are dealing with plants rooting in failed movement joints and sealant that has lost its bond to the brick or render, we can put it right, whatever the surface.
Somewhere as small as Chipping, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
Your job is guaranteed for a year, as with all our work.
- Where
- Chipping (SG9)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it.
What happens on the day
On the day, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. The work usually takes a few hours to a few days, depending on the length of joint and the access. Somewhere like Chipping needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
Preparing for the visit
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
Get a quote
There’s no standard price list. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Read more
Honest limits
A few problems are outside what sealant work can do:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracks in the bricks or render themselves, away from the joints
- Loose or hollow render, which needs re-rendering
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Concrete & block
- Render & cladding joints
- Copings & trims
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
Common problems we fix in Chipping
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
These are the problems we are asked about most:
- Cracked joints where brick meets render or frames
- Water getting into walls through failed joints
- Hard, crazed mastic that has stopped moving
- Moss and dirt in joints with no sealant left
Around Chipping, as everywhere, external mastic is only as good as the preparation behind it.
Before booking anyone
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
- How the colour is chosen
- Whether VAT is included
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- Access and height
- The old material and how stubborn it is
- How much there is to do
- The type of sealant required
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Any access issues, like height or stairs
- The address or postcode of the job
- Pictures of the joints, sent by email
- Whether it’s a home or a business
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
More services for Chipping
Chipping questions
Can you do external mastic in Chipping?
Yes, Chipping is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Is external mastic in Chipping guaranteed?
All our work, in Chipping and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
What is backing rod for?
Backing rod controls the sealant depth and keeps it off the back of the joint. That way it bonds to the two sides only and can stretch.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we are using and why.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
How often do external joints need resealing?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
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’ll quote.
Landlords and letting agents in Chipping can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render, so the damage spreads beyond the joint. Where a wall is exposed, as many are in small places like Chipping, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Ask us for a quote and we will go through it with you.
Why choose Mr Mastic in Chipping
- We are fully insured
- ARBOMaster approved applicator
- Old sealant always removed completely
- Sealant colour chosen to suit
Read what affects the cost or our reviews.
What external mastic looks like in Chipping
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Freman College? Then larger buildings have long runs of movement joint that eventually need resealing.
Chipping is in Hertfordshire. Chipping gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Across Hertfordshire, we cover 381 places, Chipping among them. You can also see our page for Chelmsford, roughly 27 miles from Chipping.
We work across SG9 for external mastic and the streets around it. We also cover the places around Chipping: Wyddial (1 mile east), Buckland (1 mile north), Throcking (1 mile south-west), Layston (1 mile south-east) and Buntingford (2 miles south-east). Larger places within reach include Stevenage (8 miles south-west), Bishop's Stortford (11 miles south-east), Welwyn Garden City (13 miles south-west), Hitchin (10 miles west), Hoddesdon (15 miles south) and Hertford (12 miles south).
Near you in Chipping
In Chipping, that means homes and buildings near The Countryman pub, among other places. Well-known places in the area include Anstey Hales Farm (3.8 miles east). Open spaces near Chipping include Hawkins Wood.