IBR Roof Repairs Cape Town covers the inverted box rib profile found on most modern houses, garages, warehouses and workshops in the city. Compare quotes from contractors who work with sheet metal roofing rather than tile.
IBR is a durable, low-maintenance roof when it is fixed correctly. Nearly every IBR leak traces back to one of four things: fixings, laps, flashings or a pitch that is too shallow for the profile.
Roof area, sheet condition and whether it is leaking now.
Get IBR Roof Repair QuotesWhy IBR Roofs Leak
- Perished screw washers. The EPDM washer under the screw head hardens and cracks with UV, and every screw becomes a small hole. On an older roof there can be several hundred of them.
- Overtightened or underdriven screws. Overtightening crushes the washer and dimples the sheet; underdriving leaves a gap. Both leak.
- Screws through the pan instead of the rib. Fixing in the valley of the profile puts the hole where water runs. It is a common shortcut on cheap installations.
- Insufficient side lap. One rib of overlap is not enough in a driving south-easter, and capillary action pulls water uphill through a tight lap without sealant.
- End laps too short or unsealed. Sheets joined mid-slope need adequate overlap and a lap sealant, particularly at low pitch.
- Pitch below the minimum. IBR needs roughly 5 degrees minimum, and less than that on long sheet runs means water backs up at the laps.
- Corrosion at cut edges. Cut and drilled edges expose bare steel, and near the coast that is where rust starts.
Repairing Versus Re-Sheeting
Replacing washers, resealing laps and swapping a few sheets is straightforward and cheap. Once rust has perforated sheets in several places, or the fixing pattern is wrong across the whole roof, re-sheeting gives better value than repeated patching. Contractors usually settle this by checking whether the rust is surface-level or through the sheet, and whether it is at isolated points or across the roof.
IBR Roof Repairs Cape Town Prices
| Work | Indicative range | Notes |
|---|---|---|
| Call-out and minor repair | R950 – R2,500 | Includes basic resealing |
| Screws and washers replaced | R25 – R60 each | Usually done in batches |
| Full refixing, whole roof | R60 – R150/m² | All fixings renewed |
| Lap sealing | R80 – R180 per metre | Side and end laps |
| IBR sheet replaced, supplied and fitted | R380 – R750/m² | Gauge and colour dependent |
| Ridge capping replaced | R220 – R480 per metre | Including closures |
| Flashing replaced | R250 – R650 per metre | Abutments and barges |
| Rust treatment and coating | R110 – R240/m² | Where sheets are still sound |
| Full re-sheet, 150m² | R60,000 – R115,000 | Strip and re-cover |
| Translucent sheet replaced | R850 – R2,200 each | Common failure point |
Indicative Cape Town ranges, not quotations. Sheet gauge, colour coating class, roof height, access and whether the purlins are sound all affect the figure. Longer sheets cost more to transport and handle but avoid end laps, which is usually worth paying for.
Ask each contractor whether they are pricing a repair or a re-sheet, because the two are often confused.
Compare IBR Repair QuotesCoastal Corrosion
Salt air attacks galvanised and coated steel faster than anything else in Cape Town. Roofs in Blouberg, Table View, Milnerton, Sea Point, Hout Bay and along False Bay commonly show rust at screw heads, cut edges and sheet ends years before an equivalent roof in Durbanville or Kuils River. Where sheets are being replaced near the coast, ask what coating class is being specified and whether the fixings are stainless or coated, because standard fixings in a marine environment fail long before the sheet does.
Where IBR Is Found
Modern houses and townhouse complexes, garages, carports, workshops, warehouses, factories, farm buildings and school halls. For the profile options and gauges available when replacing, see roof sheeting in Cape Town. For rust on other metal profiles, metal roof repairs in Cape Town covers the broader case.
Frequently Asked Questions
Can an IBR roof be repaired?
Yes, and most IBR faults are cheap to fix. Replacing perished screw washers, resealing laps and swapping individual sheets are all routine. Re-sheeting only becomes necessary when corrosion has perforated sheets across the roof.
Why does my IBR roof leak at the screws?
The rubber washer under the screw head hardens and cracks with UV exposure, leaving a small hole at every fixing. On roofs older than about ten years, replacing all the washers often solves multiple leaks at once.
What is the minimum pitch for IBR sheeting?
Around 5 degrees for standard installations, with longer sheet runs and lap sealants required at the lower end. Below the manufacturer's minimum, water backs up at the laps and warranties generally do not apply.
How long does an IBR roof last in Cape Town?
Commonly 20 to 40 years. Coastal properties sit at the lower end unless a higher corrosion-resistance coating and suitable fixings were specified at installation.
Can rusted IBR sheets be painted instead of replaced?
Surface rust can be treated, primed and coated. Sheets rusted through need replacing, because coatings bridge nothing and the perforations reopen.
How do I know if the sheets need replacing or just refixing?
Press-test from the inside where possible: sheets that flex or flake at the fixing points are done. Isolated surface rust means treatment; rust through the sheet at multiple points means replacement.
Should the whole roof be refixed at once?
If the washers have perished at several points, yes. Replacing them a few at a time means repeat call-outs, and doing the whole roof at R60 to R150 per square metre usually works out cheaper.
What causes the banging noise from my IBR roof?
Thermal expansion, usually where sheets are pinned too tightly or fixed at the wrong points so they cannot move. It is not itself a leak, but it points at a fixing issue worth having looked at.
IBR is the most common sheeted roof quoted through Roofing Contractors Cape Town, on both homes and industrial buildings.
Related Roofing Services
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Need IBR roof repairs? Compare quotes from sheet metal roofing contractors servicing Cape Town before booking anyone.
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