HESP Weatherization
Wall Insulation
- Walls must be insulated to one of the following levels:
- Enclosed cavities were filled to capacity with dense-pack insulation
- Open cavities were filled to capacity with low density spray foam
- High density spray foam was applied to within 1.5” of the surface of cavities that were subsequently enclosed
- Walls were covered by a minimum of 2” of rigid foam insulation (applied over the studs)
- Batt insulation not eligible for rebates
- Upgrade must be followed by a Building Performance Institute (BPI) energy assessment
- Code-approved fire protection was added to foam insulation when applicable
- Cost of insulating the walls must be at least $1000 more than rebate amount