The Bo-Kaap climbs up the slopes of Signal Hill above the city centre, with brightly painted houses, cobbled streets and the oldest mosque in South Africa on Dorp Street. Homes here are packed close together and often very old, so pests like rats, cockroaches and pigeons move easily from one roof to the next.
The local picture in Bo-Kaap
Original timber beams, yellowwood or pine floors and sash windows can carry old borer damage, and some of it may still be active. Treatment has to respect the heritage fabric, so we start with an inspection before anything else.
Most homes are flat-roofed terraced houses from the 18th and 19th centuries, many with thick walls, old timber beams and small backyards. Flat roofs and parapet walls give pigeons places to roost and nest. Shared walls and old drainage pipes let cockroaches and rodents travel between neighbours.
The suburb sits on the lower slopes of Signal Hill, with steep streets that catch the full force of the South-Easter as it comes off Table Mountain. Winter rain runs down the hill and can soak old walls, encouraging fishmoths and damp-loving insects. The city centre below provides food and shelter for rodents.
What gives them away
- Tunnels or loose patches in the thatch where rodents have been moving.
- Small round exit holes in the poles, especially in the paler sapwood.
- Insects such as cockroaches or spiders falling from the ceiling.
- Birds pulling reed out of the roof or nesting under the eaves.
- Fine powder dropping from the poles or laths onto floors and furniture below.
Borer in the poles and laths weakens the timbers that carry the weight of the thatch, which is heavy, and serious damage can mean replacing structural members. Rodents nesting in thatch chew electrical cables, and in a thatch roof that is a fire risk to take seriously. Insects dropping from an open thatch ceiling are a nuisance in homes and a real problem in guest lodges and restaurants. Bird nests in thatch can bring mites into bedrooms below.
From the technician
Borer damage in thatch is often blamed on the reed, but the reed is rarely the problem. It is the poles and laths holding it up that the beetles are after.
What happens when we come out
We start by inspecting the underside of the roof, the poles, the laths and the eaves, looking for borer exit holes, frass and rodent or bird activity. Affected poles and laths are treated with a borer spray or injection designed for timber, applied to the wood rather than soaked through the thatch. For insects living in the thatch, we use a targeted residual treatment on the underside, keeping it as light as will do the job. Rodents are handled with traps and tamper-resistant bait stations placed at wall plates and entry points, and we advise on bird netting or proofing at the eaves. Fire safety of the thatch itself, such as retardant treatment, is a separate specialist job and we will tell you if it looks overdue.
Want the full step-by-step? See how our thatch treatment service works.
Prevention that actually works
- Have open thatch ceilings in lapas and lodges checked once a year, since problems are easy to see early.
- Keep trees and creepers trimmed back from the thatch so rodents cannot step straight onto the roof.
- Ask your thatcher to check the poles and laths for borer whenever the roof is being repaired or re-combed.
- Have electrical wiring in the roof inspected regularly, especially if you have had rodents.
- Do not store firewood or boxes against the walls under the thatch, as they give insects and rodents cover.
How much will it cost?
The price depends on the size of the roof, how much of the structure is exposed and how many poles and laths show borer activity. A small lapa with an open underside is a very different job from a double-storey home with a closed ceiling. Rodent and bird work is added where needed, and timber that is too damaged to treat has to be replaced by a builder or thatcher.
Spraying the underside of your own thatch with a garden insecticide does very little for borer, which lives inside the poles, and soaking thatch in products not meant for it can do more harm than good. We would leave borer and rodent work in thatch to someone who does it regularly. Keeping the roof clear of overhanging trees is the one thing every owner can do themselves.
Thatch Treatment questions from Bo-Kaap
Why do pigeons like Bo-Kaap flat roofs so much?
The parapet walls and flat roofs give them sheltered ledges to roost and nest. Netting or spikes on parapets, plus clearing nests, usually move them on.
Do you treat the thatch for fire?
No, fire retardant treatment is a specialist job for thatching contractors. We treat the pests in the roof and will point out if the thatch looks like it needs attention.
Do you come out to Bo-Kaap for thatch treatment?
Yes. Bo-Kaap is part of our regular City Bowl & Atlantic Seaboard route, along with Malay Quarter, Schotsche Kloof, De Waterkant, City Bowl. Most bookings are done within about 48 hours, and after-hours visits can be arranged.
How do I know if the borer is still active?
Fresh, pale powder below the poles and clean-edged holes point to active borer. We can tell you on inspection, or send us a photo on WhatsApp first.
Do I need to move out?
Usually not. We will tell you which rooms to keep clear during treatment and for how long.
Are Bo-Kaap's old houses more prone to wood borer?
They can be, because many still have original timber beams and floors. A proper inspection will show whether the beetles are active and what treatment is safe for heritage timber.
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