Homeowners need not be displaced for days at a time to complete an insulation upgrade project. Icynene has announced that its Classic Max light-density open cell and ProSeal medium-density closed cell foam insulation now have 4-hour re-occupancy allowances for homeowners and trades. Refinements to the low-VOC formulations allowed the maker to lessen exposure risks, reducing the re-occupancy by more than 80%. The new 4-hour timeframe for Classic Max and ProSeal is based on an active ventilation rate of 40 air changes per hour (ACH). icynene.com