Roof trusses Cape Town covers the structure holding the roof up: trusses, purlins, beams and the connections between them, along with the borer, rot and overloading that damage them.
Truss problems usually show up as a symptom somewhere else, and they are frequently the result of a leak that ran for years. Leak tracing is covered under roof leak repairs, and the full service range under Waterproofing Cape Town.
Photograph the roof line from outside and the roof space from inside if you can get in safely.
Get a Roof Truss QuoteSigns of Truss Trouble
- A dip, sag or wave visible along the roof line from the street.
- Cracks appearing in cornices, above doors or across ceilings below.
- Doors and windows that have started to bind.
- Fine powder or small round holes in roof timbers, which indicate borer.
- Soft, darkened or crumbling timber, which indicates rot from a long-term leak.
- Truss members that have been cut for a geyser, skylight or extraction.
- Visible movement at plates, gussets or bolted connections.
What Damages Trusses
| Cause | What it does |
|---|---|
| Long-term leaks | The most common cause. Water keeps timber damp until rot establishes. |
| Wood borer | Beetle larvae tunnelling through timber and reducing its strength. |
| Cut members | Trusses cut for geysers, skylights or ducting without an engineered repair. |
| Overloading | Heavier covering laid on a structure designed for something lighter. |
| Wind uplift | Repeated load working at fixings and connections over years. |
| Poor original workmanship | Undersized members, missing bracing or inadequate connections. |
Changing from sheet metal to concrete tile roughly triples the weight the structure carries. If a roof covering has been changed at some point, the trusses are worth checking regardless of whether anything looks wrong.
Inspection and Repair
- Inspect the roof space: timbers, connections, bracing and any water staining.
- Trace and stop any active leak first, or the repair will rot too.
- Assess borer activity and whether the timber retains structural strength.
- Get an engineer's assessment where members are cut, sagging or being replaced.
- Repair by sistering, plating or splicing where damage is local.
- Treat surrounding timber for borer where it is present.
- Replace and re-brace where repair is not viable.
Roof Trusses Cape Town Prices
| Job | Indicative range | What moves it |
|---|---|---|
| Timber trusses, supplied and installed | R280 – R650 per m² | Span, pitch and load. |
| Light-gauge steel trusses | R350 – R750 per m² | Span and specification. |
| Individual truss repair | R450 – R1,200 each | Sistering, plating or splicing. |
| Purlin or beam replacement | R350 – R850 per linear metre | Access and section size. |
| Borer treatment | R80 – R200 per m² | Extent and treatment method. |
| Structural engineer's inspection | R1,500 – R4,500 | Property size and report detail. |
| Roof space inspection | R750 – R2,500 | With a written report. |
| Re-bracing an existing roof | R120 – R320 per m² | Extent required. |
These are indicative market ranges, not a quotation. They are compiled from published South African waterproofing and roofing pricing to give you a starting point for budgeting. They are not the rate card of any company on this platform.
Compare quotes on the system specified, the number of coats, what preparation is included and what the guarantee covers. A rate per square metre means nothing until you know what the rate covers.
If the roof line is visibly dipping, get it inspected before any covering work is quoted.
Get a Structural AssessmentCape Town Considerations
Wind uplift is the load that works on connections here. The south-easter and the winter north-wester both pull at a roof rather than push on it, and bracing and fixings are what resist that.
Borer is present across the older housing stock, particularly where roof spaces are poorly ventilated and have stayed damp. Coastal properties add corrosion at bolted and plated connections, which matters as much as the timber condition on roofs near the sea.
Related Services
Frequently Asked Questions
How much do roof trusses cost in Cape Town?
Supplied and installed timber trusses generally run R280 to R650 per square metre of roof area, depending on span, pitch and load. Repairing an individual truss is roughly R450 to R1,200, and a structural engineer's inspection R1,500 to R4,500.
What are the signs of truss problems?
A visible dip or wave in the roof line, doors and cornices cracking below, sagging ceilings, daylight at joints in the roof space, and fine powder or small holes in the timber. Any of these is worth investigating before the covering is touched.
What is borer and how serious is it?
Wood-boring beetle larvae tunnel through timber and weaken it. Fine powder below a beam and small round exit holes are the signs. It is treatable while the timber still has strength, and a replacement job once it does not.
Can trusses be repaired or must they be replaced?
Individual members can often be sistered, plated or spliced where the damage is local. Widespread borer, rot from long-term leaks, or trusses that have been cut for a geyser or skylight usually need proper engineered repair or replacement.
Do I need an engineer for truss work?
For anything structural, yes. Cutting, altering or replacing trusses changes how the roof carries load, and an engineer's design is what makes that safe. It also matters to insurers and to any future sale.
Why did my trusses rot?
Almost always a long-term leak that was never traced. Water running down a truss keeps timber damp enough for rot to establish, which is why fixing the leak is the first part of any truss repair.
Are timber or steel trusses better?
Timber is cheaper and standard on domestic roofs. Light-gauge steel does not burn or attract borer and handles longer spans, and is more common on commercial and industrial buildings. Both work when designed properly.
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