Thundridge expansion joint sealing
Work needed on a movement joint in Thundridge? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Debris jammed in movement joints
- New sealant over old, now failing
- Spalled or broken joint edges in floors and decks
Need expansion joint sealing in Thundridge?
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Expansion joint sealing in Thundridge
Our movement joint work takes in walls, panels, decks and floors: brickwork and blockwork joints, precast and cladding panel joints, concrete joints, car park decks and ramps, podiums and floor movement joints. The product depends on the movement, the weather and anything that runs over it. We work on cladding panel joints, precast concrete panel joints and brickwork movement joints, and what we are called in for most is arrises breaking up along floor joints and damp inside where a wall movement joint has failed. Searching for sealant specialists in Thundridge? Mastic Doctor has worked for contractors, FMs and building owners since 2005, CHAS accredited and a Constructionline member.
Smaller community and commercial buildings around Thundridge have their own movement joints in walls and floors. They’re easily forgotten until water gets in or an edge breaks.
We stand by our work with a 12-month guarantee. That covers our preparation and application, and we come back if anything isn’t right.
- Where
- Thundridge (SG12)
- Region
- Hertfordshire
- Guarantee
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Call
- 01277 525 020
- Page updated
- 3 November 2026
Floors, slabs and movement joints in Thundridge
Thundridge lies roughly 23 miles out from central London. Warehousing clusters around the motorways that ring and radiate from London, and their floor joints take forklift and pallet-truck traffic all day. Thundridge sits in one of the drier corners of the country, the South East. External slab and deck joints still need a dry, clean joint to seal, while winter salting gets into any joint left open.
On a site such as Thundridge Business Park (under half a mile north-west of Thundridge), the movement joints are in car park slabs, paving and building elevations. In a school such as Thundridge Church of England Primary School, movement joints in brick, block and hall floors tend to be forgotten until they leak. Hospital campuses such as Hertford County Hospital, 3.6 miles south-west of Thundridge, grow in stages, leaving movement joints wherever new blocks meet old.
Thundridge is about 1 mile north of Ware, in Hertfordshire. We cover commercial sites throughout Thundridge. 371 places across Hertfordshire fall within our area, including Thundridge. London is covered too, around 23 miles from Thundridge.
If you need expansion joint sealing in SG12, the process matches everywhere else we work: details, then a fixed price, then sealing and a 12-month guarantee. Streets here include Woodlands Road, Cold Christmas Lane and Ducketts Wood, and sites on any of them can send details for a fixed quote. Close to Thundridge, our area also takes in Wadesmill (1 mile north), Cold Christmas (1 mile east), High Cross (1 mile north), Ware (1 mile south) and Tonwell (2 miles west). Bigger towns within reach include Stevenage (8 miles north-west), St Albans (14 miles south-west), Bishop's Stortford (8 miles east), Welwyn Garden City (7 miles west), Harpenden (14 miles west) and Hitchin (13 miles north-west).
Local landmarks in Thundridge
Recent enquiries here include premises near Sow & Pigs pub and The Chauncy School. Thundridge’s nearest station is Ware station, roughly 1.8 miles south of the centre. Other landmarks nearby include Hertford County Hospital (3.6 miles south-west) and Barrowfield (2.5 miles south). Green spaces nearby include King's Meads.
When it isn’t the sealant
Some faults sit outside our scope, and we point that out rather than sealing over them:
- Joints too narrow for the movement, which need redesigning by the engineer
- Failed waterproofing membranes on podiums, roofs or decks (a waterproofing specialist’s job)
- Broken or spalled joint edges, which need repairing before any sealant goes in
If you’re not sure, just call 01277 525 020 or email a schedule or drawings and we’ll give you a straight answer before you book.
What we seal
- Brickwork movement joints
- Car park decks and ramps
- Cladding panel joints
- Blockwork control joints
- Precast concrete panel joints
- Podiums and floor movement joints
Maintenance after handover
Cleaning and maintenance staff play a part too. Pass these on to them:
- Leave barriers in place until fresh joint sealant has cured
- Include every elevation and deck joint in periodic inspections
- Record the sealant used and the date in the O&M file
- Brief car park operatives to protect joint lines during winter clearance
Floor joints on main traffic routes need watching more closely than the rest. Avoid standing heavy loads or racking legs on the joints and flag chipped arrises before they spread.
On a multi-storey car park, a failed joint usually shows up as a leak onto the deck underneath. That water often carries de-icing salts with it, which is bad news for the concrete and the people parking below. Sealing the joint promptly stops it at source.
Your questions answered
Do you cover business parks and estates near Thundridge, such as Thundridge Business Park?
Yes, sites like Thundridge Business Park are within our area, along with the rest of Thundridge. Send details of the unit and the work through our quote form for a quick quote.
Is Thundridge too far out for you?
No. Places such as Thundridge are covered as much as the big towns. We work across Greater London and the South East. We plan jobs in smaller places so return trips are kept to a minimum.
Why has the sealant in our expansion joints split?
It depends on how the sealant has let go: a split through the middle points to over-stretching, while peeling from one face points to preparation or primer. Sometimes the edge material itself has failed.
Does the weather affect joint sealing?
Weather matters for any external joint. Internal floor joints are far less affected.
Can you work on car park ramps and decks?
Yes. Deck and ramp joints are resealed with a trafficable sealant chosen for the movement, and phased work can be planned so parts of the car park stay in use.
Do your applicators hold CSCS cards?
Yes. If you need card details for site access, let us know and we’ll send them with the quote.
What if the joint edges are damaged?
Spalled edges need repairing before a new seal will last, and we will point out where that’s the case. A bead on a broken edge soon lets go.
How a job runs
Working in a building that stays open takes some planning. The work area is signed and kept contained, with routes through the building left open and work section by section so the rest of the building stays in use. Jobs in and around smaller places like Thundridge are typically planned as a single visit, so photographs and measurements up front really help. Then the right materials arrive with us.
- First, the joints are inspected for width, movement and the type of failure.
- You get a fixed quote with the product and its movement capability stated.
- Old sealant and filler are cut out and the joint faces cleaned back to sound material, and we tell you if any edges need repairing first.
- Backing rod goes in at the right depth, or bond-breaker tape where the joint is shallow.
- Primer goes on where the manufacturer specifies it, followed by the sealant, which is then tooled off.
- We check every joint before sign-off, and the work carries our 12-month guarantee.
Preparing the site
- Arrange parking or a loading space
- Confirm the product named in the specification
- Let us know about inductions and permits
Request a quote
A good quote starts with a clear picture: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we will fill any gaps with a visit.
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Work for main contractors and building owners
FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we’ll confirm them with the quote.
Main contractors use us as their sealant subcontractor on new-build and refurbishment projects. We work to your programme, your specification and your site rules, with CSCS-carded applicators on site.
Should maintenance staff do it?
For a quick touch-up, site staff may be fine, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
Certain joints really need a specialist: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. Getting these wrong usually costs more in the end than doing them right.
Why act early in Thundridge
Some quotes just add sealant over the old bead. A bead over the old seal can’t bond or flex and soon lets go. Full removal and preparation is in every quote. Around Thundridge, it’s better to renew all the failing joints at once, rather than one at a time. Send photographs of each area and we will quote for the lot.
There’s no price list, because the scope varies so much from one building to the next. Call for a quote and we’ll price your job on its own details.
Why choose Mastic Doctor in Thundridge
- Over 20 years of commercial sealing
- Coloured sealants to suit the setting, where available
- Colour agreed before work starts
- Products installed to the manufacturer’s instructions
See how commercial sealant jobs are priced or how we’re accredited.