Guides · Moth protection

Moths eat protein fibre. Wool, silk and cashmere are at risk; jute, cotton and synthetic are not.

The single sentence above answers most of the search intent on this topic, and almost nobody leads with it. Below are the real protocols: how to store a wool rug so moths cannot reach it, how often to inspect, and what actually works against larvae versus what is sold to make you feel better.

Why moths eat wool and not cotton

Clothes moths and carpet beetles do not actually eat the rug: their larvae eat keratin, the structural protein in wool, silk, cashmere, and other animal fibres. Keratin is a nutrient; cellulose is not. That is why jute, cotton, linen, bamboo silk, viscose and synthetic rugs are safe, and why a plant-fibre rug stored next to a moth-damaged wool rug does not develop damage of its own.

Adult moths are not the pest. The adult female lays eggs on a wool surface in a quiet, undisturbed place, and the larvae that hatch spend weeks or months grazing on the pile before pupating. By the time an adult moth is visible in a room, the damage underneath a cabinet or inside a rolled rug has already been happening for a season or more.

Where damage usually appears

Three patterns describe almost every case of moth damage on a wool rug.

Under furniture that is never moved. The underside of a sofa, a sideboard, or a bed is the ideal environment for larvae: dark, still, undisturbed. The rug surface in those zones shows bare patches when the furniture finally moves.
Inside rolled rugs in storage. A wool rug rolled and stored in a dark cupboard for a year without being unrolled is the single most-common site of serious damage. The rug looks perfect from the outside; the loss is on the pile face, folded inward.
Low-traffic edges and corners. Perimeter zones that do not get walked on or vacuumed hold eggs and larvae longer than the trafficked centre of the rug.

Storage: the only part that is non-negotiable

Four rules cover almost every long-term storage mistake. These apply to wool, silk, cashmere and any protein-fibre rug stored for more than a few weeks.

Roll, do not fold. Folding creases wool permanently; rolling keeps the fibre structure intact. Roll with the pile facing inward so the surface is protected.
Wrap in breathable paper, not plastic. Plastic traps moisture against the fibre, which encourages mildew and does not stop moths. Acid-free kraft paper or a cotton sheet lets the rug breathe.
Store cool and dry. A stable room at household temperature with low humidity is correct. Avoid attics (temperature swings) and basements (moisture).
Unroll and inspect every three months. This is the single most effective anti-moth protocol there is. Unroll on a clean floor, vacuum both faces, inspect for eggs or larval casings, re-roll. Three months is the maximum interval between unrollings; shorter is better for a long-stored piece.

Inspection intervals in use

For a rug installed on the floor, the inspection protocol is simpler but still deliberate.

Weekly: vacuum the full rug, including the perimeter and underneath furniture that can be moved.
Monthly: rotate the rug 180° so wear and light exposure even out, and move any furniture that normally stays put.
Quarterly: inspect under heavy furniture that cannot be rotated. Look for small holes, bare patches, or thread-like casings glued to the pile base. Those casings are the diagnostic sign; adult moths are the symptom, the casings are the proof.
Annually: professional clean a wool rug. The clean lifts eggs and larval casings the vacuum does not reach, and resets the maintenance clock.

What works versus what is sold

The honest table on moth prevention products.

Method	What it does	Honest verdict
Regular vacuuming	Lifts eggs, larvae and loose fibre off the pile; disturbs the quiet environment larvae need.	The single most effective domestic protocol. Costs nothing beyond time.
Rotation and furniture-moving	Removes the undisturbed dark zones larvae favour.	Second most effective. Costs nothing.
Professional cleaning (annual)	Washes out eggs, larval casings and the frass they leave behind.	Effective, worth doing annually on wool.
Freezing (72 hours at −20°C)	Kills eggs, larvae and adult moths through the full life cycle.	Works on rugs small enough for a freezer. Specialist cleaners offer it as a service for larger pieces.
Heat treatment (over 50°C for several hours)	Kills larvae and eggs.	Works, but can shrink wool and lift dye. Specialist equipment only.
Cedar blocks and cedar wardrobes	Volatile oils in cedar wood have a mild repellent effect on adult moths.	Mild deterrent at best. Does not kill larvae. Scent fades within months. [NEEDS: cite a specific controlled-trial source if we want to go further than ‘mild’.]
Mothballs (naphthalene, para-dichlorobenzene)	Fumigant that kills moths and larvae in a sealed space.	Works only in a fully sealed container, is toxic to pets and people, and leaves a lingering smell on wool. Not recommended domestically.
Lavender and herbal sachets	Scent only.	Pleasant smell, no measurable effect on moth populations.
Insect-growth-regulator strips	Pheromone traps catch adult moths; IGR disrupts the larval cycle.	Useful as a monitoring tool; traps indicate presence, which is itself the signal to inspect and clean.

If you find damage

Three steps, in order.

Stop the active infestation. Vacuum the whole rug and the surrounding floor thoroughly, then dispose of the vacuum bag or empty the canister outdoors. Freezing or heat treatment through a specialist cleaner is the next step if the infestation looks established.
Inspect every protein-fibre textile in the room. Moths move between pieces: curtains, soft furnishings, wool cushions, cashmere jumpers in a drawer. If the rug is infested, the rest of the room needs the same look.
Decide on repair. On hand-knotted and handloom wool rugs, a bare patch can be re-woven with matched yarn — a specialist job. On hand-tufted the bonded latex backing makes patch repairs practical for small damage, but not for large areas. Flatweaves can usually be re-woven section by section.

What goes wrong on moth prevention

Treating cedar as a solution. Cedar scent displaces adult moths briefly; it does not kill larvae and the scent fades. Cedar is a mild deterrent, not a treatment.
Using plastic to wrap a stored rug. Plastic traps moisture and encourages mildew without stopping moths.
Storing a wool rug for a year without unrolling. This is the single most common cause of catastrophic damage we see on returning rugs.
Mothballs in an unsealed room. Naphthalene is a nervous-system toxin at household concentrations; in an unsealed space it does not reach the fumigant concentration needed to work. The health risk is real, the pest-control value is not.
Ignoring the undersides of furniture. Larvae need dark, quiet and undisturbed; sofa and sideboard undersides fit the brief exactly.

What this means at specification

If a programme calls for storage of wool rugs between seasons (hospitality out-of-season storage, retail samples held between showrooms), build the inspection cycle into the maintenance contract. We write a storage brief into our pro-forma on request, with the four non-negotiable rules and the quarterly unroll interval.

If a programme is for an environment that cannot support quarterly inspection — long-term off-site storage, a space without reliable rotation — the honest answer is a plant-fibre or synthetic-fibre rug, not a wool rug with a treatment plan. Fibre decides risk; the treatment plan manages it, it does not remove it.

Wool for warmth. Jute or cotton where storage is uncertain.

We quote construction, fibre and GSM against the environment the rug will live in — including the storage cycle, where it exists. Honest fibre choice beats clever treatment every time.

Get in touch Why wool

Frequently asked

Do moths eat all rugs?

No. Moth larvae eat protein fibre: wool, silk, cashmere, and other animal fibres. They do not eat jute, sisal, cotton, linen, bamboo silk, viscose, or synthetic fibres. A plant-fibre or synthetic rug stored next to a moth-infested wool rug does not develop damage.

What is the single most effective moth prevention?

Regular vacuuming of the full rug including the perimeter, plus monthly furniture rotation. These two disturb the dark, still, undisturbed zones larvae need, and physically remove eggs and loose fibre. They cost nothing beyond time.

How do I store a wool rug long term?

Roll (never fold) with the pile facing inward, wrap in acid-free paper or a cotton sheet (never plastic), store cool and dry, and unroll to inspect and vacuum every three months. The three-month unroll is the single most important part.

Does cedar actually work against moths?

Cedar has a mild repellent effect on adult moths because of volatile oils in the wood, but it does not kill larvae and the scent fades within months. Treat it as a mild deterrent only. The protocols that work are vacuuming, rotation, freezing / heat treatment, and professional cleaning.

Can a moth-damaged rug be repaired?

On hand-knotted and handloom wool rugs a bare patch can be re-woven with matched yarn by a specialist. On flatweaves sections can be re-woven. On hand-tufted the bonded latex backing makes patch repairs practical for small damage but not for large areas; a severely damaged hand-tufted rug is replaced.

Are mothballs a good solution?

No. Naphthalene and para-dichlorobenzene mothballs are fumigants that work only in a fully sealed container at the right concentration, and they are toxic to pets and people. In an unsealed room they do not reach pest-control concentration but still release vapour; the health risk is real and the pest-control value is not.