Thedden expansion joint sealing
Expansion joint sealing in Thedden, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.
- Sealant peeling off one face of the joint
- Chipped joint edges on forklift routes
- Water getting into the wall through a failed joint
Expansion joint sealing for Thedden sites
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
How we handle expansion joint sealing in Thedden
Mastic Doctor has sealed movement joints since 2005 for contractors, facilities managers and owners. CHAS accredited, Constructionline member, CSCS-carded applicators and five million pounds of public liability insurance. Each job is backed by a 12-month guarantee on the workmanship. If you have movement joints with split or torn sealant and hardened, cracked sealant on exposed facades, we can help. Whoever orders the work in Thedden, the brief is typically the same: a clear scope, tidy work and joints that don’t fail again.
Jobs around smaller places like Thedden are planned so the whole job is done in one visit. Note joint widths and the traffic that uses them, and we will take it from there.
The 12-month guarantee is for workmanship rather than wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we’re clear about what is covered before work starts.
- Location
- Thedden (GU34)
- Region
- Hampshire
- Guarantee
- 12 months on our workmanship
- Quote
- Quoted before any work starts
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Why it’s worth doing now in Thedden
Resealing is usually the answer, not replacing the element. If the material either side is sound, a properly prepared reseal restores the joint. We will flag where edges need repair before sealing. One visit to deal with every failing joint makes more sense than several trips to a place like Thedden, rather than one at a time. Send photos of each area and we will quote for the lot.
Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. Send the details and a fixed figure follows.
Why clients in Thedden choose us
- A Constructionline member, so easy to vet
- CHAS accredited
- A fixed quote before work starts
- Commercial sealant work since 2005
Read what affects the cost or our accreditations and insurance.
Joints that move: notes for Thedden
Central London is about 47 miles from Thedden. Distribution warehouses and industrial estates are common around the motorway corridors that serve the capital, and their floor joints take forklift and pallet-truck traffic all day. The 3 miles around Thedden take in at least three named trading estates, business parks or retail parks. Sites like these are full of saw-cut floor joints, yard slabs and car park joints.
At places like Kerridge Industrial Estate, 2.6 miles to the east of Thedden, joints are sealed a section at a time so operations carry on. Hospital campuses such as Alton Community Hospital, 1.6 miles to the east of Thedden, grow in stages, leaving movement joints wherever new blocks meet old. Business parks such as Mansfield Business Park, 2.5 miles south-west of Thedden, have car parks, paved areas and long brick and panel elevations, all with movement joints.
Thedden is about 2 miles west of Alton, in Hampshire. Looking for expansion joint sealing in Thedden? We can help, as we do across Hampshire. 723 places across Hampshire fall within our area, Thedden among them. We also cover Reading, some 21 miles away.
Business premises anywhere in GU34 are within our area. If your building is just outside Thedden, we cover Beech (1 mile south-east), Wivelrod (1 mile south-west), Bentworth (1 mile north-west), Holt End (1 mile west) and New Copse (2 miles west). A short drive away, we cover Basingstoke (9 miles north), Winchester (14 miles south-west), Farnborough (15 miles north-east), Fleet (12 miles north-east), Aldershot (13 miles north-east) and Petersfield (10 miles south).
Landmarks near Thedden
The nearest railway station is Alton station, roughly 2.6 miles east. Nearby you will also find Alton Community Hospital (1.6 miles east) and Barton Castle (3.9 miles west). The countryside around Thedden includes King's Hill.
How a job runs
We schedule the visit to fit the site hours and access windows you give us. While we’re working, the area stays contained and tidy, and your contact hears from us before we move to the next area. Rural sites near Thedden may need directions, gate codes or a contact on site. Add it to your enquiry and we’ll build it into the plan.
- First the joints are inspected, widths measured and the type of failure noted.
- A fixed quote names the sealant we propose and its movement class.
- Phasing is agreed so decks, floors or entrances can stay in use where needed.
- We strip the old sealant or filler and prepare each face until it’s sound and dry.
- Backing rod or bond-breaker sets the depth, primer goes on where specified, and the sealant is applied and tooled.
- Finished joints are inspected, the cure time confirmed and the 12-month guarantee applies.
Before we start on site
- Clear stock, furniture or equipment away from the joints
- Explain the parking and delivery arrangements
- Let building users know which areas are affected
Getting a fixed quote
Quotes are fixed against the scope you send, so the cost is agreed before work starts. To start the process, give us a call on 01277 525 020 or email a schedule or drawings.
Read more
When to bring in a specialist
For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class.
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.
Your questions answered
Is Thedden off your patch?
Not at all. Thedden is within our area. London and every South East county are within our area. Where we can, we group nearby jobs to make the most of each trip.
Can you work on a hospital site such as Alton Community Hospital?
Yes. Healthcare sites are among the places we work. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Do you reseal car park expansion joints?
Yes. These joints take wheels, salt and water, so product choice matters and broken edges are flagged before sealing.
How long will the new sealant last?
There isn’t a single answer, since movement, weather, cleaning and use all affect it. Regular checks let you plan resealing before leaks or damage.
Do you use silicone or polyurethane in movement joints?
The right product depends on the joint. Low-modulus neutral-cure silicone suits many facade joints, while polyurethane is common in trafficked floor and deck joints unless the specification names something else.
Can you work to our specification?
Yes. We follow the specification, along with the manufacturer’s installation guidance, and we raise anything unclear before work begins.
Is it fine to apply new sealant on top of old?
No. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.
Also in Thedden
After the work
After handover, these steps help:
- Raise snow-clearing blades over deck joints where possible
- Record the sealant used and the date in the O&M file
- Put movement joints on the planned maintenance inspection round
- Keep stones and debris out of open joint lines
Every joint we seal is backed by a 12-month guarantee on workmanship. Keep the handover details, product and date with your O&M records, so the next reseal starts with the facts.
Joints sealed at the same time generally fail around the same time. It pays to check every joint, not just the obvious one. We can suggest an order, worst joints first.
Surface by surface
Car park decks and ramps
Water coming through deck joints is the usual first sign. We strip the old seal, prepare the edges and seal again.
Podium joints
On podiums, the joint can belong to a larger waterproofing detail. Where the specification calls for sealant, we reseal, and tell you if the problem looks like the waterproofing below.
Building owners, agents and FMs in Thedden
We work for building owners and managing agents on sealant work across single buildings or whole portfolios. Several sites can go on one quote, which keeps the paperwork simple.
When you manage a building on behalf of an owner, you need clear quotes and clear reporting. You get a fixed quote, an agreed scope and a walk round at the end, plus a 12-month guarantee.