Photograph of severe mold and flood lines in a basement (C) Daniel Friedman Mold-resistant Construction Products & Practices
     

  • MOLD RESISTANT CONSTRUCTION - CONTENTS: Priorities for Preventing Indoor Mold Contamination in Buildings following flooding or storm damage. How to respond quickly to building floods to avoid a mold problem: what steps to take, in what priority. How to move furnishings or possessions from a flooded home to a new or temporary location without bringing along a mold or contamination issue. How to recognize cosmetic molds to avoid unnecessary mold remediation cost. CONSTRUCTION DETAILS TO AVOID MOLD in a new or flood-repaired building and Interior Maintenance to Avoid Mold - Building maintenance tips to avoid indoor toxic mold contamination. How to prevent mold in buildings - construction details and choices of materials to prevent toxic mold. Building and HVAC recommendations to minimize mold problems in hot humid climates
  • POST a QUESTION or READ FAQs about how to build or repair a building to resist mold contamination
  • REFERENCES

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Mold resistant construction practices: clean up existing mold, repair & build to avoid future mold problems: this article describes how to prevent mold growth in buildings. We discuss priorities of action to avoid indoor mold contamination after building flooding or wetting from roof or plumbing leaks.

We distinguish between harmless cosmetic mold and mold that needs to be removed, and we outline both construction and building maintenance details that will help prevent future mold growth in a building.

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Priorities for Preventing Indoor Mold Contamination in Buildings

Photograph of flooded file cabinetsAll mold is everywhere, all the time, according to one of our mold mentors, an experienced mycologist. So how do we prevent a mold problem in a building? We avoid or quickly correct conditions that invite problem mold colonies from growing indoors.

In areas subject to high humidity, wet soils, rain, freezing weather, or other conditions that encourage high indoor humidity, building leaks, poor building ventilation, or other conditions that tend to produce indoor mold and its potential harmful effects and high costs, it is possible to reduce the chances of a future mold problem.

Article Contents

BUILDING FLOODS - Building Leak or Emergency Flood Response Procedures to Avoid Mold

Here are our recommendations for emergency response to building floods, burst pipes, sewer backups, roof blow-offs or other sudden catastrophic soaking of buildings.

These suggestions are based on 30 years of experience in construction, construction inspection, and our indoor air quality and mold investigations and laboratory testing. Additions, corrections, and content suggestions for this list are invited.

  1. Respond immediately to building leaks and floods. This means within 24-48 hours all of the critical steps need to be taken if you want to maximize the chance of avoiding a costly mold cleanup project. This topic will be expanded in detail at this website (coming). Basically:
    • Before entering a building that has been flooded review
      FIRST PRIORITIES: What to Do After a Building Has Been Flooded to address life, health, and safety concerns.
    • Stop the water entry
    • Remove standing water
    • Remove wet carpets, furniture, and boxes of wet stored items
    • Remove floor trim and lower portions of walls (such as drywall or paneling) (at least 12") and any wall insulation, in rooms where the floors were wet or flooded.
    • Remove upper portions of wall coverings (drywall or paneling) higher than 12" if these areas are wet, or if water entered the wall cavity from above.
    • Remove ceilings that have been flooded from above
    • Remove wet materials (such as areas listed above) until you find a 12" or greater area of dry clean margin.
    • Use dehumidifiers, fans, heaters, to dry the exposed building areas and surfaces.
    • If mold is already visible or suspected, use containment to avoid air movement from the damaged (moldy) area to other building areas. Containment generally means negative air and poly plastic barriers.
    • Read: Mold Action Guide after Flooding: How to Minimize Mold Damage After a Building Flood
    • Read: Flood Response for Septic Systems what to do after a septic system has been exposed to flooding
  2. Keep unwanted outside water out of the building. This means attention to the roof drainage system (gutters and leaders), surface drainage, and at some sites, unusual levels of ground water. In buildings where we find recurrent basement water entry, most of the time the underlying cause is inadequate maintenance of gutters and downspouts, with roof spillage against the foundation.

    Preventing indoor mold by keeping outside water out also means proper construction of all exterior components, roofing, siding, windows, doors, trim, steps, patios, exterior light fixtures, even downspout straps, to keep water out of building walls and cavities.

    See vapor barriers for a discussion of vapor barriers behind vinyl siding. The importance of flashing and house wrap on conventional construction pales next to the importance of property detailing when problem-prone building exteriors such as EIFS Synthetic Stucco are used since if workmanship is not exactly correct with those materials leaks into the building cavities trap water and often lead to costly damage, rot, or mold.

    See Exteriors, Landscaping, & Siding - Inspection, Repairs, Product Failures for a discussion of exterior building materials and defects.
  3. Humidity: Maintain Proper Indoor Humidity Levels to avoid mold. See What indoor humidity should we maintain in order to avoid a mold problem? Also see VENTILATION in BUILDINGS.
  4. Leak Prevention: proper roofing and flashing details are critical to avoid longer term building leaks at the roof and at other building penetrations such as windows, doors, plumbing vents. Indoors, replace corroded plumbing traps, use burst-resistant washing machine hoses and fixture supply risers. When possible, turn off water when leaving a building vacant for some time.
    See WATER ENTRY in BUILDINGS.
  5. Mold-resistant Building Materials: should be used where possible, especially in high-risk areas such as basements and bathrooms.
    See Mold proof drywall ? You Must Be Kidding!
  6. Mold-Friendly Building Materials: should be avoided in high risk areas. Do not put mold-friendly construction materials (stuff on which mold grows readily) into damp areas. In our experience this means the items listed at Interior Construction Product Installation Details below
  7. Ventilation: to avoid indoor mold, proper venting avoids build-up of high moisture in building cavities and avoids, in freezing climates, leaks into building cavities from ice dams. See our discussion of attic venting and under-roof ventilation
    at Detecting and Correcting Attic Condensation and Preventing Ice Dam Leaks in Buildings

    and see our discussion of bathroom ventilation fans, ducts, and indoor moisture control
    at Bathroom Ventilation.

    Crawl space ventilation and dryout steps are discussed at How to Dry Out a Crawl Space.

    Also see VENTILATION in BUILDINGS - our home page for this topic.

IMPORTING MOLD - How to Avoid Bringing Problem Mold Into a Building

How to move furnishings or possessions from a flooded home to a new or temporary location

If you are moving items out of a home that has been flooded and if that building has become visibly mold-contaminated, there is a significant risk that you will be bringing mold-contaminated dust or even active mold colonies from the flooded building into the new one.

  • Inspect items for visible mold or moldy odors before bringing them into the new location.
  • Items that have been flooded or wet by flood waters are likely to be unsanitary as flood-waters often contain sewage and other pathogens, even if the items are not visibly mold-contaminated. The following items can usually be cleaned and sanitized
    • Hard goods such as dishes, plastic items, hard-wood-surfaced furniture (be sure to clean all surfaces)
    • Soft goods that can be laundered or dry-cleaned

      The following are examples of items are usually beyond economic cleaning and repair if they have been flood-damaged and / or are visibly mold-contaminated:
    • Drywall
    • Upholstered furniture
    • Wall-to-wall carpeting and carpet padding
  • Clean all dusty, soiled, wet, or moldy but salvageable items before moving them to a new building, home, or storage if at all possible.

The best approach is to remove moldy furnishings or other possessions from the flooded building, have them cleaned, and then bring them into the new building.

  • If you cannot clean items before moving them into storage, make sure that the items are thoroughly dry and then pack them in sealed plastic containers for brief storage before having those items laundered or cleaned.

Pressure Treated lumber" which is sold as resistant to rot and resistant to wood destroying insects is very often not only wet when purchased, but is often mold contaminated with several species of Penicillium sp. or Aspergillus sp. We confirmed this condition by a survey of building materials at several lumber suppliers in New York, using tape samples of visible mold on the surfaces of these products.

When using pressure-treated lumber for interior framing, clean off any visible mold. Simple power-washing would suffice. This step is not necessary and would be inappropriate for the same lumber when used outdoors, such as for a deck or an entry stair.

But inside, such lumber may be used for sill plates or in some cases I've seen it used to re-frame a rotted floor over a wet crawl space. Importing a large Aspergillus sp. colony on the floor framing surface over a crawl space provided an immediately-detectable high level of airborne Aspergillus sp. in the room above this area, as these spores move easily in convection air currents moving from the crawl area up through the building.

COSMETIC MOLDS - How to Avoid Unnecessary Mold Cleanup Expenses

As long as we are discussing not bringing mold into a building, it's important to warn against unnecessary expenses cleaning up "cosmetic-only" molds such as black mold commonly found on kiln-dried lumber which has been exposed to wetting in transit or storage.

Usually this is a cosmetic-only mold in the Ceratocystis/Ophistoma bluestain group. However in a few cases where this "black mold" on lumber was on wood framing later exposed to flood basements or crawl spaces, I've also found problematic mold growing mixed with this cosmetic inhabitant.

See Stuff that is Not Mold or Harmless Mold and review Harmless Cosmetic Molds in that document.

CONSTRUCTION DETAILS - Interior Construction Product Installation Details to Reduce Mold-Risk

  • Avoiding Mold Growth on Drywall: when installing drywall in basements or in any location where a floor is at extra risk of becoming wet, keep the bottom edge of drywall at least 1/2" off of the floor. Avoiding floor contact means that a small spill which wets the floor, if cleaned up promptly, will not soak up into the drywall itself. We 'm not sure it's cost effective but you might want to consider using mold resistant drywall.
  • Avoiding Mold Growth on Wood paneling: use the same floor clearance detail for wood paneling. We find severe mold not only on the exposed side of wood paneling but often, even if no mold is visible on the room side, the un-coated back surface of this material supports mold growth in buildings which have been wet or subject to high moisture.
  • Avoiding Mold Growth on and Behind Floor trim: Even weeks after a "water damage company" had reported that they had "fully dried out a building" by "extracting the water" in it, we found very high moisture in the lower portion of the building walls.

    Pulling off floor trim showed (in several investigations) that the back of the wall/floor trim was not only still wet with visible water droplets, but it had already become moldy. The drywall behind the this trim, and the wall cavity itself as well as insulation in it were also quite wet and moldy. When installing floor trim in a basement below grade, or in a bathroom or kitchen where spills are likely, I back-prime and end-prime all trim boards.

    In bathrooms we caulk the trim to the floor, putting a small bead of caulk on the under-side of the trim boards as they are placed. The caulk won't be visible, but it'll reduce the chances of a small spill sending water into the wall cavity.
  • Avoiding Mold Growth on Floor cabinets in Bathrooms and Kitchens: When we are installing them, we spray the under-side and backs of floor cabinets with clear lacquer before installing them.

    This takes only a few moments, as the lacquer dries almost immediately. (Proper venting needed.) By sealing these surfaces we reduce the rapidity of moisture up-take into them in damp or wet conditions.

    Reducing the moisture uptake in these materials reduces potential mold growth on these hidden surfaces and gives more time for building dry-out after a wetting event. In bathrooms we caulk the junction of the exposed cabinet bottom and the floor after the cabinet is in place.
  • Avoiding Mold Reservoirs in Fiberglass insulation: Don't put fiberglass insulation under floors over damp or wet crawl spaces - we are conducting a study of this topic.
    See INSULATION MOLD TEST for details.

    Preliminary data shows that very often we find sever Aspergillus sp. or Penicillium sp. infection of fiberglass over damp crawl spaces and in damp building walls against below-grade foundations, even when there is no mold actually visible on the insulation or its kraft paper facing.

    On below-grade building walls that are to be insulated we prefer solid foam insulating board as it does not hold moisture and is less mold-friendly
    see Mold Resistance of Foam Insulation).

    For more information see FIBERGLASS INSULATION MOLD, and

    also see FIBERGLASS HAZARDS in buildings.
  • Avoiding Mold Reservoirs in Indoor Carpeting: wall-to-wall indoor carpeting which has been wet should be discarded. We have never seen a successful clean-up of this material in place after flooding. Carpets form a particle reservoir, including allergens, mold, mites, etc. in buildings which can be a problem especially in basement areas which can be expected to be damp even when there is no water entry.

    We advise against using carpeting in these areas at all. If basement carpeting in a building has been wet, remove and discard it promptly.

    After building dry-out and cleanup have been completed, install a hard surface flooring or simply paint the exposed concrete slab with an epoxy paint. Nicer surfaces such as ceramic or vinyl tile work well. (Sheet vinyl may become moldy on its backside if the floor or slab below are damp.) If you are concerned about making a warmer or more quiet surface, use area carpets which can be sent out for regular cleaning.

MAINTENANCE - Interior Maintenance to Avoid Mold Suggestions from the U.S. EPA

This list based on a shorter EPA list, with additions and edits by the author.

  • Fix leaky plumbing ... This means watching for corroded sink and tub traps and replacing them before they leak into the floor; find and fix loose toilets; use burst-proof washing machine hoses - this failure has led to some serious building floods. Insulate cold water lines to avoid condensation leaks into building cavities, basements, crawl spaces.

    ... and leaks in the building envelope as soon as possible - this means noticing roof leaks, roof flashing leaks, soffit leaks, leaks at windows, doors, plumbing vents, leaks where decks or patios abut the building wall.
  • Watch for condensation and wet spots. Fix source(s) of moisture problem(s) as soon as possible. This means looking in your basement and crawl space for signs of water entry - which we discussed above.
  • Prevent moisture due to condensation by increasing surface temperature or reducing the moisture level in air (humidity). - This means that you may find condensation on walls in cool closets or behind pictures hung on cool walls - places where air is not circulating. Heavy drapes in some buildings lead to mold on the walls behind them.

    To increase surface temperature, insulate or increase air circulation. To reduce the moisture level in air, repair leaks, increase ventilation (if outside air is cold and dry), or dehumidify (if outdoor air is warm and humid).
  • Keep heating, ventilation, and air conditioning (HVAC) drip pans clean, flowing properly, and unobstructed.

    We often find A/C condensate leaking into building walls and floors when drains are clogged. In climates where A/C systems remove a large amount of moisture from building air, watch for water blowing out of the condensate tray right into the blower assembly or even into ducts downstream in the air handler system - a common source of mold in air conditioning duct work.
  • Vent moisture-generating appliances, such as dryers, to the outside where possible.

    Venting dryers into attics, basements, crawl spaces is a bad idea. If those areas are seasonally too dry, use a humidifier with a humidistat. When showering, use the vent fan - install one if there is none.
  • Maintain low indoor humidity, below 60% relative humidity (RH), ideally 30-50%, if possible.
  • Perform regular building/HVAC inspections and maintenance as scheduled. - Change air filters monthly when these systems are in use, and at that time, inspect for condensate leaks.
  • Clean and dry wet or damp spots within 48 hours. - as we expound in more detail above.
  • Don't let foundations stay wet. Provide drainage and slope the ground away from the foundation. -- But remember our advice from above. - most wet basements and crawl spaces are in that condition because of outside gutter and leader defects.

-- Initial Source: Mold Prevention Tips U.S. EPA.

MOLD RESISTANT CONSTRUCTION - OSHA Advice

The following mold resistant construction advice is from OSHA Guide to Workplace Mold.

Moisture control is the key to mold control. When water leaks or spills occur indoors - act promptly. Any initial water infiltration should be stopped and cleaned promptly. A prompt response (within 24-48 hours) and thorough clean- up, drying, and/or removal of water-damaged materials will prevent or limit mold growth.

Mold prevention tips include:

  • Repairing plumbing leaks and leaks in the building structure as soon as possible.
  • Looking for condensation and wet spots. Fix source(s) of moisture incursion problem(s) as soon as possible.
  • Preventing moisture from condensing by increasing surface temperature or reducing the moisture level in the air (humidity). To increase surface temperature, insulate or increase air circulation. To reduce the moisture level in the air, repair leaks, increase ventilation (if outside air is cold and dry), or dehumidify (if outdoor air is warm and humid).
  • Keeping HVAC drip pans clean, flowing properly, and unobstructed.
  • Performing regularly scheduled building/ HVAC inspections and maintenance, including filter changes.
  • Maintaining indoor relative humidity below 70% (25 - 60%, if possible).
  • Venting moisture-generating appliances, such as dryers, to the outside where possible.
  • Venting kitchens (cooking areas) and bathrooms according to local code requirements.
  • Cleaning and drying wet or damp spots as soon as possible, but no more than 48 hours after discovery.
  • Providing adequate drainage around buildings and sloping the ground away from building foundations. Follow all local building codes.
  • Pinpointing areas where leaks have occurred, identifying the causes, and taking preventive action to ensure that they do not reoccur.

Questions That May Assist in Determining Whether a Mold Problem Currently Exists

  • Are building materials or furnishings visibly moisture damaged?
  • Have building materials been wet more than 48 hours?
  • Are there existing moisture problems in the building?
  • Are building occupants reporting musty or moldy odors?
  • Are building occupants reporting health problems that they think are related to mold in the indoor environment?
  • Has the building been recently remodeled or has the building use changed?
  • Has routine maintenance been delayed or the maintenance plan been altered?

Always consider consulting a health professional to address any employee health concerns.

 

Continue reading at ACTION GUIDE - WHAT TO DO ABOUT INDOOR MOLD or select a topic from the More Reading links shown below.

Or see FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUPdiscusses the initial response to building flooding, and in more depth, building methods and materials useful for improving the mold-resistance of new construction, renovated buildings, and repairs after mold remediation in buildings.

Or see these flood damage cleanup guides

FUNGICIDAL SPRAY & SEALANT USE GUIDE - separate articles

FLOOD-CAUSED MOLD, PREVENTION

MOLD SPRAYS, SEALANTS, PAINTS

MOLD PREVENTION AFTER FLOODING

MOLD PRODUCTS, INEFFECTIVE - separate articles

Suggested citation for this web page

MOLD RESISTANT CONSTRUCTION at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

More Reading

Green link shows where you are in this article series.

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Frequently Asked Questions (FAQs) about how to prevent mold growth on or in buildings, building surfaces, building materials, and building contents

Question: Best plan for removing mold on wood flooring and ceilings & preventing its reappearance

Our builder is constructing a log cabin for us during the hot, moist summer months. The roof has not been fully completed so the interior structure has been exposed to many afternoon rains (as of August 15, 2011).

Tongue and groove eastern white pine flooring provides the flooring for 2nd floor as well as ceiling for 1st floor. Both sides of the T & G will be visible in the completed log cabin. Dark staining and spotting from mold/mildew growth has appeared on the T & G flooring in many, repeat...many, places and needs to be addressed in a timely and correct manner.

The metal roof will be installed in one week. Windows and doors are not installed yet. What is your recommendation as to the best procedure and plan of action to remediate this unsightly, unhealthy, and disturbing occurrence? - Brenda Eller

Reply: After Building Dry-In, Use Sanding, HEPA Vacuuming, Media Blasting, Use of Clear Fungicidal Sealants & Floor Coatings to remove mold and prevent future mold growth

Brenda you're right that white pine T&G flooring easily supports mold growth, particularly when wet and before it has received any finish coating.

The building has to be at the dry-in state so that you can dry out all interior materials and keep them dry, else cleaning costs and effort may be wasted.

If the upper side of your T&G flooring is to be sanded before finishing, that'll do the trick to remove problem mold on the upper floor surfaces.

The under-side can also be wiped, & HEPA vacuumed, but I suspect that won't remove stains nor even mold left in hard-to-reach crevices. If mold is left in flooring crevices it will sometimes reappear below a coating, making future cleaning still tougher.

So you might want to consider cleaning the underside as well as other irregular surfaces that are moldy using media blasting.

At MOLD CLEANUP GUIDE- HOW TO GET RID OF MOLD you'll see in that article series an article on using media blasting to clean surfaces

MOLD CLEANUP - MEDIA BLASTING along with some photos of what an impressive job that method can perform.

When surfaces are clean if you coat them with two or even three layers of clear polyurethane that will reduce moisture up-take in the wood and thus resist future mold appearance. If wood is to be stained of course you'll do that before applying poly.

There are also clear sealants used by some mold remediation companies that might work well on the under-side of floors (ceilings) where the wood is to be left exposed. I wouldn't use those on the walk-on surfaces unless the manufacturer agrees that their sealant is hard enough for floor traffic.

Clear fungicidal sealants suitable for use where wood ceilings or framing are to be left exposed are illustrated
at FUNGICIDAL SPRAY & SEALANT USE GUIDE

Question: how can we prevent mold growth in timeshare units located in the Caribbean?

La Manzanilla, Mexico Pacific Coast (C) D FriedmanHello, we are a timeshare company based in the Caribbean. The area is extremely humid thus we have a lot of mold issues. Are you aware of any remedy/product available to prevent mold from growing also on lampshades and wall paintings?

All our lampshades become moldy after a period of time. We were wondering if it exist any type of spray that can act as a coating.

Thank you for the information you can give us. - D.C.

Reply: recommendations for preventing indoor mold in a hot humid climate & for minimizing the risk of mold damage or hazards

A competent onsite inspection by an expert usually finds additional clues that help accurately diagnose a problem with indoor moisture and moisture control - the gating factors in the mold growth problem you describe. Our photo (above left) illustrates several types of buildings located in a hot humid climate. We did not find significant mold contamination problems in these structures, as I explain further below.

Because all mold is everywhere all the time, when the indoor environment is particularly friendly to one or several mold genera/species that like to grow on common building materials and surfaces (drywall, carpets, furnishings, painted surfaces, lampshades, wall paintings), it will grow there.

What those building and building-contents loving molds need are food, air, and water. Of those three, the most effective approach, as it protects so many materials against mold growth, is to stop building leaks and keep indoor humidity levels down below 50% (perhaps even 40% in some cases).

  • Use air conditioning or dehumidification to keep indoor humidity down below 50%, or I prefer 45%; when a living unit is unoccupied you can probably leave the A/C set to a high temperature, as long as it's just a bit below the outdoor temperature levels - that will cause the system to run enough to help dehumidify the building interior. You may need to experiment with thermostat settings, and automatic setbacks to find the best balance point between minimizing energy usage costs and minimizing the risk of costly mold damage.

If you do not use indoor cooling and/or dehumidification, then indeed what's left is to

  • Mold resistant materials: do what you can to use mold-resistant materials when buying new furnishings or when remodeling or repairing one of your living units. In the article above, beginning at MOLD RESISTANT CONSTRUCTION we list some approaches to making your building as mold resistant as you can.
  • Test some fungicidal sealants on clean dry surfaces that have been a problem. These products can retard mold growth primarily (in my OPINION) by sealing the surface of a material to reduce moisture uptake (clear sealants are available) and secondarily by having included chemicals in the sealant coating that make the coating itself resistant to mold growth. Details are at FUNGICIDAL SPRAY & SEALANT USE GUIDE
La Manzanilla restaurant (C) Daniel Friedman
  • Indoor ventilation, where cooling and dehumidification are not being used, is a more tricky question. If we bring hot humid air into an interior space that is cooler than the outdoors, moisture may condense on or in interior surfaces and materials, making the mold problem or mold risk worse.

    On the other hand, if indoor and outdoor temperatures move together, such as occurs in living quarters that are completely open to the outdoors in some tropical areas, increased use of ventilation and fans may actually help reduce risk by improving the indoor evaporation rate.

    In our photo (left) I'm enjoying coffee in a restaurant on Mexico's Pacific coast (La Manzanilla). Construction is so open to outdoor air that the building and its contents remain very well ventilated. I did not see any mold problems in this building nor on its contents, even though it is located in a hot humid climate.
  • Inspect regularly for mold contamination and act promptly to clean up the mold - that means removing it from surfaces that can be cleaned, and disposing of stuff that can't be cleaned, as well as checking for unusual causes of mold growth such as leaks or improperly functioning air conditioners or dehumidifiers. Regular inspections can be particularly important in your circumstances because of the combination of a very humid environment, high temperatures, and living units that may remain unoccupied for long periods, risking extensive and thus expensive mold contamination if a problem is left un-checked.
  • Mold on artworks: We have assisted several museums & curators with mold diagnosis, cure, & prevention on works of art. Beyond the control of indoor humidity that we've already discussed, specific steps you'll want to take will depend on the materials used and the value of the paintings or works of art in your buildings. No valuable artwork should be sprayed or coated with a fungicidal sealant, certainly not before consulting with an expert art conservationist.

    However it may be possible to frame, enclose, or treat the back surface of some paintings without damaging the work itself nor impinging on its artistic or monetary value. Take care to distinguish between mold growth and other types of moisture-damage to artworks such as extractive bleeding stains. Other artworks we have examined suffered severe mold damage, including a wide range of media such as paper-based prints and lithographs or etchings and oil paintings on canvas. Some examples of mold contamination of art works that we've examined are found at ARTWORK MOLD CONTAMINATION.

    At  ART CONSERVATION - Cultural Heritage and Aerobiology we describe a text that offers some help in controlling mold and other sources of damage to paintings as well as other cultural artifacts.

Watch out: There may also be health risks to some of your occupants, particularly those with asthma, mold allergies, the elderly, infants, or people with compromised immune systems.

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