Kalk Bay is squeezed between the mountain and the sea, with a busy fishing harbour, Main Road restaurants and old cottages stacked up the slope. Fish, food and old buildings together mean rats, cockroaches and gulls are part of daily life.
The local picture in Kalk Bay
Old timber floors, roof beams and window frames are prone to wood borer. Beetle certificates are standard when selling these cottages.
Most homes are old fishermen's cottages and Victorian houses built close together on steep ground, many with timber floors and pitched roofs. Along Main Road there are shops, galleries and restaurants in older buildings. Old stonework, retaining walls and underfloor voids give rodents plenty of hiding places.
The mountain rises steeply behind the village, with Boyes Drive cutting across the slope, and the railway runs right along the sea. The harbour brings in fish and gulls daily. Salt spray and the South-Easter keep things damp in winter and windy in summer.
A note from the field
A technician looking at a thatch roof checks the wall plates first. That is where rodents get in and where they nest, warm and dry, against the top of the wall.
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 gives them away
- Small round exit holes in the poles, especially in the paler sapwood.
- Tunnels or loose patches in the thatch where rodents have been moving.
- Rustling or scratching in the roof at night.
- Insects such as cockroaches or spiders falling from the ceiling.
- 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.
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.
Keeping them out afterwards
- Do not store firewood or boxes against the walls under the thatch, as they give insects and rodents cover.
- Fit bird netting or wire at the eaves if birds keep pulling reed or nesting there.
- Have electrical wiring in the roof inspected regularly, especially if you have had rodents.
- Ask your thatcher to check the poles and laths for borer whenever the roof is being repaired or re-combed.
- Have open thatch ceilings in lapas and lodges checked once a year, since problems are easy to see early.
What affects the price
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.
Questions we get asked in Kalk Bay
Will the treatment damage my thatch?
No. We treat the timbers directly and keep any treatment of the thatch itself light and targeted.
Can you treat a lapa or braai area?
Yes, lapas are often the easiest to treat because the whole structure is open underneath.
Do the rats in Kalk Bay come from the harbour?
Many do. The harbour and restaurant bins are a reliable food source, so rats move into nearby homes and shops, and we focus bait stations and proofing on those routes.
Do you come out to Kalk Bay for thatch treatment?
Yes. Kalk Bay is part of our regular South Peninsula route, along with St James, Muizenberg, Fish Hoek, Clovelly. Most bookings are done within about 48 hours, and after-hours visits can be arranged.
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.
Why do gulls keep nesting on my roof in Kalk Bay?
Flat or low-pitched roofs near the harbour are ideal nesting spots, and there is plenty of food nearby. Bird proofing with spikes, wires or netting before the breeding season keeps them off.
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