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Flyscreen Repair
A guide on graph paper

The flyscreen, and the insects it keeps out

A flyscreen is a fine mesh between a room and the insects outside it. This guide, published by Dotto, reads what Australia’s health departments, food regulators and building code say about that mesh: which insects it is for, how fine it should be, where the law asks for it, and what it cannot do.

A square of insect mesh with a torn patch A fine square mesh held in an aluminium frame. Near the middle the wires are broken and the patch is torn open, with short frayed wire ends around the hole. A mosquito is drawn just outside the tear.
Drawing, not to scale: a torn patch in a square of insect mesh. Queensland’s advice is to keep insect screens in good condition with no visible damage.

Every page here is written from official pages read on 8 October 2026, and each one names its sources at its foot. Where the states say different things, each state keeps its own line, in its own words.

A flyscreen is made to keep insects out, not to stop a fall: Victoria’s Better Health Channel says insect screens “do not prevent children from falling”.

Six guides

Six squares of the mesh

Each guide answers one question from the sources that own it. The figure at the top of each square comes from that guide.

  • 1.2 mm

    Mosquito-borne disease and screens

    The diseases each state’s health department names, and what each one asks of a screen.

    Victoria’s figure for window and door mesh is no coarser than 1.2 mm.

  • 4 openings

    Fighting the bite at home

    Doors, windows, vents, chimneys, beds and prams: the openings of a house, one at a time.

    Victoria, NSW and South Australia each name four openings for screens: windows, doors, vents and chimneys.

  • 3.2.2

    Flies and food safety

    What the Food Standards Code asks of a food business, and the health advice for flies at home.

    Pests are covered under Standard 3.2.2 of the Food Standards Code.

  • 1 mm

    Screens on rainwater tanks

    Queensland’s law on tank screens, and the advice in Victoria, NSW, South Australia and WA.

    Queensland’s regulation sets a mesh size of not more than 1 mm.

  • 5%

    Screens and fresh air

    Fresh air through a screened window, and what the building code counts as ventilation.

    For houses, the building code asks for ventilation openings of at least 5% of a room’s floor area.

  • 6 months

    Caring for mesh

    What the official sources say to check, how often, and what a screen is made of.

    Victoria suggests checking a tank’s mesh for holes or defects every six months.

About this guide

Read from the people who set the rules

A small green frog climbing a black insect screen at night, lit from behind so the square mesh shows clearly
A small green frog climbing a fly screen at night, lit from behind. At this distance every square opening of the mesh is plain to see.

Photo by sandid on Pixabay

Health departments write the advice on mosquitoes, food regulators write the rules for pests in a food business, and the building code sets the tests for windows. This guide puts their words side by side and keeps each one with its owner. Where only one state has spoken on something, the page says which state.

Flyscreen Repair is a guide to flyscreens in plain words, published by Dotto. It is general information: each guide names the health department, regulator or code to check for your own home or business.