Joint Sealing in South Africa closes expansion and movement joints with flexible sealants so water cannot get in. Send one request and independent local waterproofing contractors reply with prices.
Give the joint type and total length, and get joint sealing quotes.
Get Waterproofing QuotesJoints That Need Sealing
- Roof slab expansion joints. Where concrete slabs meet and move.
- Facade and wall joints. Control joints in walls and cladding.
- Window and door frames. Gaps between frames and walls.
- Floor and parking deck joints. Joints that carry traffic.
- Gutter and parapet joints. Concrete and metal joints exposed to water.
Signs a Joint Has Failed
- Sealant cracked, hard or shrunk away from the edges.
- Damp or stains along a straight line on ceilings or walls.
- Gaps around window frames.
- Weeds or dirt growing in joints.
Sealant Types
- Polyurethane (PU). Tough and paintable. Common on concrete, floors and facades.
- Silicone. Very UV resistant. Used on glazing and some facades.
- Hybrid (MS polymer). Bonds to many surfaces and is paintable.
- Joint covers and tapes. For wide joints or roofs with large movement.
A closed-cell backer rod sets the right depth so the sealant can stretch.
Joint Sealing Prices
Ballpark prices so you can sanity-check a quotation.
| Item | Ballpark price |
|---|---|
| Seal new or cleaned joints | R60 - R180 per metre |
| Remove old sealant and re-prepare | R30 - R80 per metre |
| Expansion joint cover or tape on roofs | R250 - R600 per metre |
| Scaffolding or access | R5,000 - R15,000 |
| Minimum call-out for small jobs | R1,500 - R3,000 |
Prices JUST UPDATED. Indicative ballpark figures in rand, rounded, including labour unless stated. They are not our prices or quotations, and no contractor is bound by them. Confirm VAT, access costs, the product system and what each quotation includes.
Get prices for your property rather than a range. Send one request and see who replies.
Get Waterproofing QuotesWhat Affects the Quote
- Total length. Most jobs are priced per metre.
- Joint width. Wide joints use more sealant and backer rod.
- Old sealant. Cutting out failed sealant adds labour.
- Height. Facade work may need scaffolding or rope access.
How Joints Are Sealed
- Inspection. The contractor checks width, movement and the old sealant.
- Removal. Old sealant is cut out and edges cleaned.
- Backer rod. Foam rod is set to the right depth.
- Primer. Applied where the sealant needs it.
- Sealant. Joint is filled and tooled smooth.
Preparation and Disruption
- Dry joints. Sealant needs dry, clean edges.
- Curing. Avoid traffic and water until the sealant cures.
- Disruption. Low noise. Facade work may need windows closed.
Questions to Ask
- Which sealant will you use, and is it right for this movement?
- Will the old sealant be fully removed?
- Is the joint deep enough for a backer rod?
- Will the sealant be painted over?
Joint Sealing FAQs
How long does joint sealant last?
Usually 5 to 10 years, less on sunny roofs or wide moving joints.
Can new sealant go over old sealant?
No. Old sealant should be cut out, or the new sealant will fail early.
Why is joint sealing priced per metre?
Labour and material depend on length and width.
Will sealing a joint stop my roof leak?
Only if the joint is the cause. A contractor should check the rest of the roof too.
Related Services
Request joint sealing quotes through Waterproofing South Africa and compare the sealant and preparation each contractor proposes.
Waterproofing South Africa is a quote and referral service. We do not carry out waterproofing work and we do not employ contractors. Work is quoted and carried out by independent local contractors, and your agreement is with the one you choose. The right system depends on an inspection and the cause of the water ingress. Ask for a written quotation, the product system and the guarantee terms before you pay a deposit.
Joint Sealing. Describe what you need once and get the best quote, fast.
Get Waterproofing QuotesGet the Best Quote, Fast
Keep it brief. Say what is leaking or damp, the type of surface and your suburb. Your enquiry is passed only to contractors suited to the job, and you decide whether to go ahead.
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