PRODUCTS USED: HandiFoam® HVLP closed cell foam dispensed through Nitrosys Plus® HVLP equipment.
GOAL: The goal was to find a worse-case scenario retrofit SPF job where a large volume of HandiFoam HVLP MD 2.0 would be sprayed through HVLP Nitrosys Plus equipment, and monitor this spray application for MDI monomers throughout spraying, and afterwards.
JOBSITE BACKGROUND: ICP monitored MDI monomers during a retrofit spray foam job in a hip roof attic using Nitrosys Plus HVLP dispensing equipment and HandiFoam HVLP closed cell drum foam. The house was an older, one story ranch located in Kirtland, Ohio. The attic had a footprint of 60’ x 32’, was 4’ high at its max, and contained the house’s HVAC unit. The underside of the roof deck, 1,800 ft2, was sprayed with 5,400 bd. ft. of closed cell foam at a depth of approximately 3” +/- 0.2”.
During the actual monitoring period (5 hrs.) approximately 2,200 bd. ft. of foam was applied. The attic was an entirely enclosed space other than the garage-entry hatch. The single roof pipe vent and its fan in the center of the roof was inoperable, and so little ventilation was provided from this point. From the hatch opening, the attic was ventilated continuously to the outside using a 12” tube fan and appropriate exhaust ducting. The fan operated during and after spraying. HVLP spray foam output volume was calculated at approximately 12-14 lb./min. Dynamic pressure in the dispensing gun was verified prior at approximately 90 psi by the Nitrosys Plus manufacturer, Spray Foam Systems, via rigorous testing by its engineering department.
Areas monitored for MDI monomers:
SUMMARY: HandiFoam’s HVLP System once again shows approximately the same MDI exposure results as low pressure pressurized kits and cylinders. Improved worker and occupant safety via lower re-entry, re-occupancy, and PPE requirements are constantly being verified through ICP’s continual testing.