A14: Microbe and Mold Control

(2 points)

INTENT

Reduce mold and bacteria growth through condensation management and reduce levels of microbes within occupied spaces.

SUMMARY

This WELL feature requires projects to conduct regular inspections in order to eliminate sources of microbes and mold and to inactivate existing microbes.

ISSUE

A substantial portion of buildings and homes have some form of mold, mildew or water damage. Growth of mold spores can trigger asthma, headaches, allergies and other respiratory system disorders. Exposure to mold has also been associated with hypersensitivity pneumonitis, allergic rhinitis, bronchitis, lung tumor development, eczema and toxic mold syndrome. Humidity levels constantly above 60% in the home can easily cause mold growth, which can lead to odors and cause respiratory irritation and allergies in sensitive individuals.

SOLUTIONS

In order to benefit from the known health effects of doing so, it is important to prevent and remediate indoor mold and dampness. Many studies have reported that eliminating dampness and moisture-related indoor exposures is of major importance for preventing asthma and other respiratory conditions. Mold often grows on cooling coils in HVAC systems due to moisture condensation and can be introduced into the building’s indoor air. It can also occur on or within wall assemblies due to water damage or improper detailing in humid locations, for example in kitchens and bathrooms. Water leaks, poor plumbing and poorly ventilated bathrooms can create standing water in which microorganisms such as bacteria and mold can breed. Such issues can be prevented and mitigated through a combination of regular mold inspections, condensation management plans and microbe inactivation techniques.

IMPACT

Minimizing exposure to mold and microbes leads to better air quality and reduced health risks.

REQUIREMENTS

Part 1

Implement Ultraviolet Air Treatment (1 point)

For All Spaces

The following requirements are met:

1. Project utilizes one of the below: 

   1. Projects with a forced-air cooling system use ultraviolet lamps to irradiate the surfaces of the cooling coils and drain pans of the mechanical system supplies.^[139]
   2. Projects without a forced-air cooling system use standalone ultraviolet germicidal irradiation air sanitizers in all spaces with more than 10 regular occupants. 
2. Evidence that the device has been replaced or maintained according to manufacturer's recommendation is submitted annually through WELL Online.

*Verified by MEP, Professional Narrative, On-going Maintenance Report, Photographic evidence

 

Part 2

Manage Condensation and Mold (1 point)

For All Spaces

Condensation management:

Condensation management is addressed within the project and considers the following:

1. High interior relative humidity levels, particularly in susceptible areas like laundry rooms, below-grade spaces and other high-humidity areas.

2. Air leakage that could wet either exposed interior materials or interstitially hidden materials.

3. Cold surfaces such as basements, slab-on-grade floors or the inside of exterior walls.

4. Oversized air conditioning units.

Mold inspections:

The following requirements are met:

1. Annual inspections for signs of water damage or pooling, discoloration and mold on ceilings, walls and floors is performed by a professional demonstrated not to have a conflict of interest. The report is submitted annually through WELL Online.

2. One of the below is met:

   1. Project achieves cooling coil mold reduction as per Part 1: Implement Ultraviolet Air Treatment.
   2. All cooling coils (where applicable) are inspected on a quarterly basis for mold growth and cleaned if necessary. Dated photos demonstrating adherence are submitted annually through WELL Online.
3. For projects with tenants, there is a system in place for notifying building management about mold or water damage and addressing concerns.

*Verified by Professional Narrative, On-going Maintenance Report, Photographic evidence

© International WELL Building Institute