Mould Behind Beds and Furniture: Why It Happens and How to Stop It Coming Back

You move the bed to vacuum behind it and find a large patch of mould on the wall.

Or maybe it is behind:

• a chest of drawers

• a couch

• a wardrobe

• a bedhead

• a bookcase

The rest of the room looks completely normal.

That usually leads to the obvious question:

Why is the mould only behind the furniture?

In many cases, the answer is not an obvious plumbing leak.

Furniture can create a small environment between itself and the wall where:

• air movement is restricted

• surfaces stay cooler

• humidity remains trapped

• condensation takes longer to evaporate

That can create very different conditions behind the furniture compared with the open room.

But it is important not to automatically assume every mouldy wall is caused by condensation either.

A roof leak, plumbing leak, shower failure or other form of water intrusion can create a similar-looking problem.

The key is working out where the moisture is actually coming from before deciding how to deal with the mould.

Why Does Mould Grow Behind Furniture?

Mould needs moisture.

WorkSafe Queensland explains that mould commonly grows in wet or moist areas where ventilation is inadequate, including walls, ceilings, carpets, insulation and timber.

Behind a large piece of furniture, you can have both of those things:

moisture + very little ventilation.

Think about a chest of drawers pushed tightly against an external wall.

The room air can move freely around the front of the drawers.

Behind them?

Almost nothing.

There might only be a centimetre or two between the furniture and plasterboard.

This small gap creates what is effectively a poorly ventilated pocket.

If that wall also happens to be cooler than the room, the risk becomes greater.

The Wall Behind Your Bed May Be Colder Than You Think

External walls are exposed to outdoor temperatures.

Their internal surface can therefore be cooler than walls separating two indoor rooms.

This matters because warm, humid air behaves differently when it reaches a cool surface.

The U.S. EPA explains that as air temperature falls, its ability to hold moisture decreases. When moisture-rich air contacts a sufficiently cold surface, condensation can occur.

You see an obvious version of this on a cold drink.

Water forms on the outside.

Inside a home, the same principle can affect:

• windows

• external walls

• ceiling edges

• air-conditioning vents

• cold corners

The wall does not necessarily need to look dripping wet.

Repeated periods of slightly elevated surface moisture can be enough to create favourable conditions for mould.

Why Furniture Makes This Worse

Now put a large bedhead or set of drawers directly against that cold wall.

The furniture reduces air circulation.

The wall receives less warm room air.

Moisture evaporates more slowly.

The surface can remain cooler.

This is why mould may form in an almost perfect outline behind the furniture while the exposed section of wall beside it stays clean.

Current EPA moisture-control guidance specifically recommends increasing circulation around cold surfaces and moving furniture away from wall corners to improve air and heat movement.

That simple point explains a surprising number of bedroom mould problems.

Why Does It Often Happen Behind Beds?

Beds are particularly good at creating this situation.

They are:

• large

• often positioned against external walls

• rarely moved

• sometimes fitted with solid bedheads

Bedrooms also spend long periods closed overnight.

During that time:

• windows may remain shut

• doors may be closed

• air-conditioning may be operating

• very little fresh air reaches the wall behind the bed

People also add moisture to indoor air simply by occupying the room.

None of this means sleeping in a closed bedroom automatically causes mould.

But if the room is already humid and the wall is cold, the restricted airflow behind a large bed can become the location where the problem shows first.

Why Mould Forms Behind Couches

The same principle applies in living rooms.

A large lounge pushed tightly against an external wall can prevent airflow across a substantial section of plasterboard.

This is especially relevant where:

• the wall receives little sunlight

• the property stays humid

• the room is air-conditioned

• the couch sits against a ground-floor external wall

• there has previously been water intrusion

Sometimes the mould is not discovered until the lounge is moved during cleaning or a tenancy change.

By that point, growth may extend well beyond what was initially visible around the edges.

Why Chest of Drawers and Bookcases Can Be Even Worse

Tall furniture can block a much larger section of wall.

A bookcase filled with books creates:

• restricted airflow

• organic material

• enclosed shelving

• dust

Likewise, timber or MDF drawers positioned tightly against a wall can develop mould on both:

the wall

and

the rear surface of the furniture.

You may even find the plasterboard relatively clean while the untreated fibreboard backing of the furniture has extensive mould growth.

That happens because materials respond differently to moisture.

Why External Walls Are Usually More Vulnerable

If mould only develops behind furniture on one particular wall, ask:

Is that an external wall?

If yes, that matters.

An external wall can have a lower internal surface temperature than other walls.

Cold surfaces increase condensation risk.

The EPA specifically lists exterior walls among surfaces where condensation should be controlled, including through better insulation where appropriate.

This does not mean every mouldy external wall has defective insulation.

It simply means wall temperature is part of the picture.

What About Mould in the Corner of the Room?

Corners often have poorer airflow than the centre of a wall.

Put furniture there and the effect becomes even stronger.

This is why you may see mould concentrated:

• at wall-to-wall junctions

• near skirting

• behind bedheads

• behind bedside tables

The room itself may feel comfortable.

The small pocket behind the furniture may behave very differently.

Does Mould Behind Furniture Mean There Is a Leak?

Not necessarily.

This is where people can spend money fixing the wrong thing.

Mould behind furniture can result from:

• condensation

• high humidity

• restricted airflow

• cold surfaces

But actual water intrusion is also possible.

Potential sources include:

• roof leaks

• plumbing leaks

• shower leaks

• window leaks

• external wall water intrusion

• previous flooding

So the correct question is not:

"Is mould behind furniture caused by condensation?"

It is:

"What is creating moisture at this particular wall?"

How Can You Tell Condensation From a Leak?

There is rarely one perfect clue.

Instead, look at the pattern.

Condensation may be more likely when:

• mould is mainly behind furniture

• the wall otherwise looks structurally intact

• there is no obvious water stain

• there is no bubbling paint

• the issue gets worse during humid weather

• the wall is external

• the room has poor airflow

• mould develops in corners and behind belongings

A leak may be more likely when:

• paint is bubbling or peeling

• plasterboard feels soft

• skirting is swollen

• there is obvious staining

• moisture is concentrated in one area

• mould worsens after rain

• there is a bathroom or plumbing fixture on the opposite side

These are indicators, not absolute rules.

Sometimes a room has both condensation and a leak.

Pay Attention to the Skirting Board

The skirting can tell you a lot.

If the wall behind the furniture has mould but the skirting is:

• dry

• straight

• intact

that may fit more closely with a surface-humidity problem.

If the skirting is:

• swollen

• separating

• soft

• discoloured

then moisture may be affecting the lower part of the wall assembly.

MDF skirting in particular can swell noticeably once it absorbs water.

That deserves further investigation rather than being treated as simple surface condensation.

Look for Water Staining

Condensation-related mould can occur without obvious brown water marks.

Leaks are more likely to leave:

• stains

• tide marks

• blistering

• damaged paint

• softened plasterboard

Again, not always.

A slow hidden leak can occur without dramatic staining.

But the building finish helps build the overall picture.

Does It Get Worse After Rain?

This is another useful question.

If the mould appears or becomes noticeably worse following heavy rain, consider whether water is entering through:

• roofing

• windows

• external walls

• doors

That pattern is very different from mould that gradually develops through a humid summer.

Is There a Bathroom on the Other Side?

We regularly look at wall relationships when investigating moisture.

If you find mould behind bedroom drawers and directly behind that wall is:

• a shower

• bath

• vanity

that becomes important.

The bedroom furniture might not be the true cause at all.

It may simply be hiding the first visible signs of a wet-area problem.

Where moisture readings are elevated around an adjoining bathroom wall, a plumber or appropriate wet-area trade may need to investigate the actual source.

Why Does the Wall Sometimes Look Dry?

Because a wall can be dry now without having always been dry.

Condensation can occur at certain times and evaporate later.

For example:

• overnight humidity rises

• the wall gets cold

• slight condensation develops

• the room warms during the day

• the surface dries

Repeat that cycle often enough and mould can develop even though the wall feels dry when you touch it at midday.

This is why a single touch test cannot tell you much.

Why Mould Can Appear on the Furniture Too

Sometimes you move the furniture and find mould on:

• the plasterboard

• the back of the drawers

• both

Furniture materials can be particularly vulnerable.

Mould can grow on materials containing or collecting organic material, including:

• timber

• paper

• cardboard

• leather

• fabric

• dust

WorkSafe Queensland notes that mould can grow on wood, leather, linen and other materials where suitable moisture and environmental conditions exist.

MDF and fibreboard furniture may be especially difficult once extensively affected because the material is porous.

What About Mould on a Mattress?

This should be treated differently from mould on a painted wall.

Mattresses are highly porous.

Once mould has established deeply in a mattress, reliably cleaning the entire internal material can be difficult.

Queensland Health includes mattresses among porous items that may need to be discarded where they have become wet for prolonged periods and cannot be readily cleaned.

Do not assume spraying the visible surface deals with contamination deeper inside the mattress.

How Far Should Furniture Be From the Wall?

There is no universal magic measurement.

You do not need a metre-wide gap around everything.

The objective is simply to avoid creating a tightly sealed pocket against a mould-prone wall.

Even a modest gap can allow:

• air circulation

• warm room air to reach the wall

• moisture to evaporate more readily

How much space is practical depends on:

• furniture design

• room layout

• wall temperature

• humidity

If a wall repeatedly develops mould, increasing the gap is a sensible low-cost first step.

Should You Move the Bed Away From an External Wall?

If mould repeatedly forms behind it, yes, at least far enough to improve airflow.

Where possible, you could also consider positioning the bed against an internal wall.

That is not always realistic.

But if you have two possible wall locations and one is a consistently cold external wall, the internal wall may present less condensation risk.

Does Opening the Bedroom Door Help?

It can.

Keeping the room isolated for long periods may reduce air exchange.

Opening the door can improve circulation between rooms.

Closets and wardrobes can benefit from similar treatment.

EPA moisture-control guidance specifically recommends opening doors to colder enclosed areas such as closets to improve circulation.

During suitable weather, opening windows can also help.

But outdoor humidity matters.

Should You Open the Windows During Humid Weather?

Not automatically.

If outside air is relatively dry, ventilation can help remove indoor moisture.

If the outdoor air is extremely humid, throwing every window open may introduce more moisture.

The goal is not simply:

open windows.

The goal is:

control indoor moisture.

During very humid conditions, air conditioning or dehumidification may be more effective.

Would a Dehumidifier Help?

If high room humidity is contributing to the problem, yes.

A dehumidifier actually removes water from the air.

This is different from a normal fan.

WorkSafe Queensland recommends controlling excess indoor moisture and identifies dehumidifiers and air-conditioners on dry mode as useful drying tools.

A small digital humidity meter can also be useful.

It lets you measure what the room is doing rather than relying entirely on how humid it feels.

What Indoor Humidity Should You Aim For?

WorkSafe Queensland currently recommends keeping indoor humidity between approximately 30% and 50% as a mould-prevention measure where practical.

The EPA similarly recommends keeping humidity controlled and notes that dehumidifiers and air conditioners can help in hot, humid climates.

In South East Queensland, holding exactly 30–50% every minute of the year may not always be realistic.

What you particularly want to avoid is:

persistent high humidity + cold surfaces + poor airflow.

That combination is much more important than one temporary humidity spike.

Why Fans Help — but Don't Solve Everything

A fan moves air.

That can be useful behind and around furniture.

It helps:

• disrupt stagnant air

• increase evaporation

• equalise temperatures

But a fan does not remove water vapour from the building.

If the whole room is already extremely humid, moving that same humid air around may not be enough.

That is where ventilation, air conditioning or dehumidification may be required.

Can Air Conditioning Cause Mould Behind Furniture?

Air conditioning itself is not automatically the cause.

In fact, correctly operating air conditioning can help remove humidity.

But cooling the room changes surface temperatures.

If certain walls become very cold while humidity remains elevated, those surfaces may be more prone to condensation.

This is why setting the air conditioner extremely cold is not necessarily the best strategy.

You want:

• comfortable temperature

• controlled humidity

• reasonable airflow

not the coldest room possible.

Why Bedroom Mould Can Be Seasonal

Some homes only develop this problem during particular months.

That can happen because the balance between:

• outdoor humidity

• indoor humidity

• wall temperature

• ventilation

changes throughout the year.

During a long humid period, the same wall that causes no issue for most of the year may suddenly become susceptible.

Then the weather changes and the problem seems to disappear.

That does not necessarily mean the underlying conditions are permanently solved.

What If the Mould Comes Back Every Year?

Recurring mould tells you something.

If the same wall develops mould:

• in the same location

• during the same type of weather

• behind the same furniture

then the environmental conditions are likely being recreated each time.

WorkSafe Queensland advises seeking professional guidance when mould continues returning after cleaning because underlying moisture or water conditions may remain.

Repeatedly wiping the wall may deal with the visible growth.

It does not change the conditions behind the furniture.

Can Missing Insulation Contribute?

Potentially.

Insulation helps influence the internal surface temperature of external building elements.

Where insulation is:

• absent

• displaced

• inconsistent

one section of wall or ceiling may behave differently from the surrounding area.

A colder surface has a greater chance of reaching condensation conditions.

This is particularly relevant when mould appears in a very specific repeated pattern.

But you should not assume insulation is missing simply because mould exists.

It needs to be investigated.

Can Thermal Imaging Find the Problem?

Thermal imaging can help.

But it is important to understand what it actually does.

A thermal camera does not see mould.

It also does not directly see moisture.

It displays differences in surface temperature.

That can reveal:

• cooler wall sections

• unusual thermal patterns

• areas that deserve additional investigation

Those findings can then be compared with:

• moisture readings

• humidity

• building layout

• visible damage

• history of leaks

A thermal image on its own should not be treated as proof of a water leak.

Can a Moisture Meter Tell Whether It Is Condensation?

Not by itself.

Moisture meters help assess how materials compare with surrounding reference areas.

For example, you may check:

• the mouldy section

• an adjacent section

• the bottom of the wall

• an unaffected internal wall

The pattern can help distinguish a persistently wet building material from surface condensation.

But the reading still needs to be interpreted in context.

That is where a professional moisture inspection can be useful when the cause genuinely is unclear.

When Is a Moisture Inspection Worth Getting?

Consider an inspection where:

• mould keeps returning

• the wall is visibly damaged

• skirting has swollen

• the room smells musty

• mould worsens after rain

• there is a bathroom behind the wall

• moisture readings appear elevated

• you cannot distinguish condensation from a leak

The purpose should be to answer a real question.

Not to search the house looking for problems that have no connection to the mould you discovered.

Internal link: Moisture Inspection

Do You Need Mould Testing?

Usually not simply because visible mould exists behind your bed.

If you can clearly see mould, the more useful question is normally:

why is it growing?

Testing may be valuable in particular circumstances, but it should have a defined purpose.

For a straightforward visible mould problem, identifying and correcting the moisture conditions is generally much more important than learning the species name.

Can You Just Clean the Wall?

Sometimes.

It depends on:

• how much mould is present

• what material is affected

• whether the material is physically damaged

• whether the moisture source has been corrected

WorkSafe Queensland distinguishes between smaller clean-up areas and larger mould problems requiring additional controls and professional advice. It recommends professional advice for medium and large affected areas, particularly where containment may be required.

Small Surface Mould on an Intact Painted Wall

If:

• the area is small

• the plasterboard remains intact

• there is no water damage

• the cause is clearly condensation

• you can safely address the moisture issue

then the solution may be relatively straightforward.

The key is not just cleaning it.

You also need to change the conditions that allowed it to grow.

That might mean:

• moving furniture away from the wall

• improving ventilation

• lowering humidity

• using dehumidification

Otherwise, the mould may simply return.

What If the Plasterboard Is Mouldy?

Plasterboard is porous.

This changes the decision.

WorkSafe Queensland advises that porous materials such as plasterboard, insulation and carpet that cannot readily be cleaned, have remained wet for extended periods or have visible mould may need to be discarded.

This does not mean every mould mark requires a wall to be removed.

But if the plasterboard has been:

• significantly wet

• softened

• deteriorated

• extensively contaminated

surface cleaning may not be appropriate.

What If There Is Mould Behind the Skirting?

This can indicate moisture has extended beyond the visible face of the wall.

Removing skirting can expose:

• plasterboard edges

• wall framing

• floor junctions

If destructive investigation is needed, it should be done for a reason and with suitable controls.

For older properties or materials of uncertain age, asbestos should also be considered before disturbing suspect building products.

What If the Timber Framing Has Mould?

Mould on timber framing does not automatically mean the timber needs replacing.

Structurally sound framing can often be:

• HEPA vacuumed

• detailed cleaned

• remediated

• thoroughly dried

Replacement becomes more relevant where the timber has actual:

• decay

• rot

• structural deterioration

which is a separate issue from surface mould growth.

Should You Spray Bleach Behind the Bed?

Simply spraying a chemical onto the wall does not deal with:

• high humidity

• condensation

• restricted airflow

• leaks

• wet materials

So even if the wall looks cleaner afterwards, the conditions may remain unchanged.

The moisture problem must be corrected.

That is why WorkSafe Queensland places fixing the water or moisture source first in its mould-remediation guidance.

Don't Dry-Brush Mould

Avoid aggressively dry-brushing or sanding mould as a casual cleaning method.

Queensland Health advises against abrasive dry cleaning because disturbing mould can release material into the air and spread contamination.

The larger and more established the affected area, the more important dust and contamination controls become.

What Professional Remediation May Involve

Where the contamination is extensive or damaged porous materials need removal, professional remediation can include:

• isolating the affected area

• containment

• HEPA-filtered air management

• HEPA vacuuming

• controlled material removal

• detailed cleaning

• drying

• moisture monitoring

WorkSafe Queensland's current remediation guidance also discusses isolation, negative-pressure enclosures and HEPA-filtered air scrubbers for larger contamination-management work.

Internal link: Mould Removal

Don't Put Furniture Straight Back After Remediation

This is a small but important point.

Imagine the wall is professionally remediated.

Then you immediately push the same solid bedhead tightly against it.

Nothing about the airflow has changed.

If condensation was the cause, the same conditions may gradually return.

Once the wall is clean and dry:

• leave an airflow gap

• monitor humidity

• watch for condensation

• avoid tightly sealing cold external walls behind large furniture

Remediation and prevention need to work together.

What About Built-In Furniture?

Built-in wardrobes and cabinetry are more complicated because you cannot simply move them away from the wall.

If recurring mould is occurring inside a built-in wardrobe, investigate:

• humidity

• wall temperature

• ventilation

• the adjoining room

• external walls

• possible water intrusion

In some cases, design changes may eventually be needed to improve airflow.

In others, correcting a leak or environmental condition solves the problem.

Why Wardrobes Are Similar

Wardrobes are effectively another enclosed space inside the room.

They often contain:

• clothing

• leather

• cardboard

• shoes

while receiving limited airflow.

If built against a cold external wall, they can be particularly susceptible.

This is why mould can develop inside the wardrobe even when the bedroom itself looks relatively normal.

Internal link: Mould in Wardrobes and Cupboards: Why It Happens and How to Stop It Coming Back

How to Stop Mould Behind Furniture Coming Back

The solution depends on the cause, but these are the most useful practical steps.

1. Move furniture slightly away from the wall

Give air somewhere to move.

You do not need a massive gap.

You just want to stop completely blocking the wall.

2. Pay extra attention to external walls

If you have flexibility, consider placing large furniture against internal walls instead.

3. Monitor indoor humidity

A small digital hygrometer can help identify whether your bedroom stays humid for prolonged periods.

4. Use ventilation when conditions are suitable

Open doors and windows when outdoor conditions will genuinely help dry the building.

5. Use air conditioning or dehumidification

Particularly during sustained humid weather.

6. Don't overcool the room

Control temperature and humidity rather than simply selecting the lowest AC temperature.

7. Let wardrobes breathe

Avoid packing belongings tightly against cold walls.

8. Deal with leaks

No amount of furniture rearranging will solve an active roof or plumbing leak.

9. Dry water damage quickly

WorkSafe Queensland advises promptly addressing wet areas and water damage, generally within 24–48 hours where practical.

10. Investigate recurring mould

If the same problem returns despite reasonable humidity and airflow changes, find out why.

A Simple Example

Imagine you move your bed and find mould covering the bottom metre of an external bedroom wall.

The wall:

• has no staining

• has intact skirting

• reads similarly to unaffected areas on moisture assessment

• feels noticeably cooler than internal walls

• has had a solid bedhead pressed against it for years

Indoor humidity has also been staying high.

That pattern may point strongly toward:

condensation + poor airflow.

The practical response could include:

• cleaning/remediating the affected area appropriately

• reducing humidity

• increasing airflow

• moving the bed away from the wall

Now imagine the same wall has:

• swollen skirting

• elevated moisture readings

• bubbling paint

and there is a shower directly behind it.

That is a completely different situation.

Moving the bed will not fix the actual cause.

The wall needs further moisture investigation.

The Pattern Matters More Than the Mould Colour

People often concentrate heavily on whether mould looks:

• black

• green

• white

• grey

Colour alone usually tells you very little about why it is there.

The useful questions are:

• Where is it growing?

• What material is affected?

• Is there a moisture source?

• Is the surface cold?

• Is airflow restricted?

• Does it return after cleaning?

• Does it relate to rain or plumbing?

Those answers are much more useful when deciding what to do next.

What If There's a Musty Smell but Very Little Visible Mould?

Do not immediately assume there is a huge hidden problem.

But take the smell seriously if it persists.

WorkSafe Queensland and Queensland Health both recognise musty odours as a possible indicator where mould is not readily visible.

Check obvious restricted areas first:

• behind beds

• behind drawers

• inside wardrobes

• under furniture

• behind curtains

If the smell remains unexplained, further assessment may be worthwhile.

When Should You Call a Professional?

Consider professional assessment if:

• the affected area is extensive

• mould keeps returning

• plasterboard is damaged

• the wall remains wet

• you suspect a hidden leak

• several rooms are affected

• you cannot determine the cause

• material removal may be required

WorkSafe Queensland recommends professional advice for medium-to-large mould areas and where underlying moisture problems cannot be resolved.

The purpose should be to determine the correct scope — not automatically turn a small condensation problem into a major remediation project.

Mould Behind Furniture in Brisbane, Logan or the Gold Coast?

Ever Ready Solutions provides mould, moisture and water-damage assessment and remediation across South East Queensland.

We regularly investigate mould affecting:

• bedroom walls

• external walls

• wardrobes

• ceilings

• skirting

• carpet

• furniture-adjacent areas

Depending on the property, assessment may include:

• visual inspection

• moisture readings

• moisture mapping

• thermal imaging

• relative-humidity readings

• surface-temperature assessment

• investigation of likely moisture pathways

Where professional remediation is required, work can include:

• containment

• HEPA air filtration

• HEPA vacuuming

• detailed cleaning

• controlled removal of affected porous materials

• structural drying

• moisture monitoring

Internal links to add:

• Mould Removal

• Mould Inspections

• Moisture Inspection

• Structural Drying & Dehumidification

• Mould in Wardrobes and Cupboards

• Mould on Plasterboard After Water Damage

• Contact Ever Ready Solutions

The main thing to remember is simple:

If mould only appears behind your furniture, don't just clean it and push the furniture back against the same wall.

Ask why that particular area supported mould in the first place.

Sometimes the answer is as straightforward as poor airflow against a cold wall.

Sometimes it is an underlying leak.

Finding that difference is what stops you repeatedly treating the symptom instead of fixing the cause.

Frequently Asked Questions

Why is mould growing behind my bed?

Beds can restrict airflow against walls, particularly external walls. If the wall is cool and the bedroom is humid, moisture may accumulate on the surface and create conditions favourable to mould.

How do I stop mould growing behind my bed?

Improve airflow between the bed and wall, control indoor humidity, avoid excessive cooling and investigate any signs of a leak or water damage.

How far should my bed be from the wall?

There is no fixed distance that works for every home. The goal is to leave enough of a gap for air to circulate rather than pressing a solid bedhead tightly against a mould-prone wall.

Why is there mould behind my drawers but nowhere else?

The space behind drawers receives very little airflow. If the wall is also colder than the rest of the room, local condensation can develop even though the open parts of the room remain unaffected.

Does mould behind furniture mean my wall is leaking?

No. Condensation and poor airflow are common causes, but plumbing, roofing or external water intrusion are also possible. Water staining, swollen skirting and elevated moisture can be signs that further investigation is required.

Why does mould grow behind furniture on external walls?

External walls can have cooler internal surface temperatures. Humid indoor air contacting those cooler surfaces can increase condensation risk, especially where furniture restricts airflow.

Can moving furniture stop mould?

It can help where restricted airflow is contributing to condensation. It will not fix an active plumbing, roof or waterproofing leak.

Will a dehumidifier help mould behind furniture?

It may help if high indoor humidity is part of the cause because a dehumidifier removes moisture from the room air.

Can a fan stop mould behind furniture?

A fan can improve airflow and evaporation, but it does not remove water vapour from the building. Persistently humid rooms may also require ventilation, air conditioning or dehumidification.

Why is mould growing on the back of my drawers?

Furniture backing materials such as fibreboard can be porous and may support mould when kept in a humid, poorly ventilated gap against a wall.

Can I clean mould off plasterboard?

Small surface contamination on intact materials may sometimes be manageable, but significantly wet, deteriorated or heavily mould-affected plasterboard may require removal. WorkSafe Queensland recommends considering replacement of porous materials that cannot be adequately cleaned or dried.

Should I use bleach on mould behind my bed?

Cleaning alone does not correct the moisture, humidity or airflow conditions that allowed the mould to grow. The underlying cause needs to be addressed.

Does black mould behind furniture mean it is dangerous?

Colour alone does not identify a mould species or establish the level of risk. Avoid diagnosing mould solely from its appearance. People concerned about symptoms or exposure should seek appropriate medical advice.

Why does mould return after I clean it?

Usually because the conditions supporting mould remain. WorkSafe Queensland recommends investigating underlying water or excess moisture where mould repeatedly returns.

Can thermal imaging detect mould behind furniture?

No. Thermal imaging detects surface-temperature differences. It can help identify areas requiring further investigation but does not directly detect mould or water.

Do I need mould testing?

Not necessarily. Where mould is already visible, investigating the moisture source and extent of affected materials is often more useful than testing simply to confirm mould exists.

Should I throw out mouldy furniture?

It depends on the material, extent and condition. Hard, non-porous materials may often be more readily cleaned, while heavily affected porous materials such as fibreboard, fabric or mattresses can be more difficult to restore.

What if the mould is behind a built-in wardrobe?

Because the furniture cannot easily be moved away from the wall, the underlying humidity, ventilation, wall temperature and possible water sources should be investigated.