Thatch Treatment Lotus River

Lotus River takes its name from the canal that runs through it towards Zeekoevlei, and that waterway is a big part of the pest picture here. It's a busy residential area with family homes, backyard rooms and small businesses side by side.

The local picture in Lotus River

Wooden Wendy houses and old pine roof trusses can get wood borer. Ask for an inspection if you notice fine dust under timber.

Most homes are free-standing or semi-detached brick houses on small stands, many with a Wendy house or extra room in the yard. Backyard structures and storerooms are often where rodents nest first. Small shops and home businesses along the main roads keep food on the premises, which draws cockroaches and mice.

Something most people miss

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.

Pale, fresh powder means activity; dark, compacted dust in old holes usually means the beetles left long ago. That distinction saves a lot of unnecessary treatment.

Tell-tale signs

1. Rustling or scratching in the roof at night.
2. Birds pulling reed out of the roof or nesting under the eaves.
3. Tunnels or loose patches in the thatch where rodents have been moving.
4. Small round exit holes in the poles, especially in the paler sapwood.
5. Insects such as cockroaches or spiders falling from the ceiling.
6. Droppings on beams or along the top of walls under the thatch.

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.

How the treatment works

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.

1. Roof inspection

   We look at the underside of the thatch, every accessible pole and lath, and the eaves and ridge.

2. Identify the problem

   We separate active borer from old damage and confirm which insects, rodents or birds are involved.

3. Timber treatment

   Affected poles and laths are treated with borer spray or injection.

4. Thatch and pest treatment

   Insects in the thatch are treated from below and rodent stations or traps are placed.

5. Report and recommendations

   You get a report noting what was treated and any timber that a thatcher or builder should replace.

Keeping them out afterwards

• Keep trees and creepers trimmed back from the thatch so rodents cannot step straight onto the roof.
• Have open thatch ceilings in lapas and lodges checked once a year, since problems are easy to see early.
• Have electrical wiring in the roof inspected regularly, especially if you have had rodents.
• Fit bird netting or wire at the eaves if birds keep pulling reed or nesting there.
• Ask your thatcher to check the poles and laths for borer whenever the roof is being repaired or re-combed.

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 Lotus River

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