PRIORITY ISSUE 22.0 PROTECTING IAQ DURING CONSTRUCTION (continued)
MINIMUM ACTIONS (MA)
EXPANDED
ACTIONS (EA)
ASSESSMENT
PROTOCOLS (AP)
MA 22.2 Protect HVAC Systems
Protect HVAC systems from contaminants during work activities.
• Seal openings in existing ducts located in work areas to avoid infiltration by dust
and debris.
• New HVAC equipment, ducts, diffusers and return registers should be stored in a
clean, dry place and should be covered to prevent dust accumulation.
• If operating an HVAC system that interfaces with the work areas, ensure that the
system does not pull return air from the work area and install air filters with a
MERV 8 rating or higher during construction activities.
• Visually inspect duct work after construction activities have been completed and
clean internal surfaces as needed to remove dust and debris.
• Ensure that all filters used during work activities have been removed and that
new filters are properly installed before operating the HVAC system during
occupancy.
MA 22.3 Protect Highly Absorptive Materials
Protect any existing absorptive materials in place by fully covering with plastic
sheeting. Fully secure all edges of the sheeting to protect materials from airborne
contaminants and emissions caused by construction.
Schedule the installation of absorbent materials—such as ceiling tiles, fabrics,
furnishings and carpet—after major dust and pollutant-generating activities are
completed. Ensure that materials have not been exposed to moisture and are dry
before installation.
MA 22.4 Safely Install Spray Foam Insulation
Employ safe work practices to avoid exposure to spray polyurethane foam (SPF).
Follow the manufacturers' printed instructions for vacating building occupants and
other unprotected individuals not involved in the application of the SPF products
from the premises during and for some period after SPF application. Require and
confirm SPF to be installed in strict accordance with manufacturer's requirements.
Note
The curing time (complete reaction) of SPF insulation varies depending on the type
of product, application technique, temperature, humidity and other factors. While
the SPF is curing it still contains unreacted chemicals, which include isocyanates
and proprietary chemicals. Manufacturers estimate that it can take approximately
1 to 3 days after application for the two-component high pressure "professional"
SPF system to fully cure and approximately 8 to 24 hours for the one-component
foam to cure. Exposure to isocyanates may cause skin, eye and lung irritation,
asthma, and sensitization. Exposures to isocyanates should be minimized. See
EPA's Spray Polyurethane Foam Web page for more information.
References for Priority Issue 22.0 Protecting IAQ During Construction:
American Chemistry Council: Spray Polyurethane Foam Health and Safety
ASHRAE Standard 62.1, Section 7.1.4.2
ASHRAE Standard 189.1, Section 10.3.1.6
EPA IAQ Tools for Schools, IAQ Reference Guide, Section 3 – Effective Communication
EPA Spray Polyurethane Foam (SPF)
SMACNA IAQ Guidelines for Occupied Buildings Under Construction
64 Energy Savings Plus Health | INDOOR AIR QUALITY GUIDELINES FOR SCHOOL BUILDING UPGRADES
