Exterior Rigid Insulation

Verify that installation area is free of:

active water leaks, fuel leaks (i.e., gas, oil, propane), and pest intrusions

energized knob and tube wiring

improperly terminated devices (ventilation fans, dryers, plumbing stacks, condensate lines, combustion appliance flues/chimneys, etc.)

unshielded high-temperature devices (non-IC rated recessed lights, chimneys, flues, vents, etc.) unless they are zero clearance devices

insulation escape openings

Verify that installation area is:

intact, able to support insulation weight, and air sealed

Select sealants that:

are compatible with their intended surfaces

allow for differential expansion and contraction between dissimilar materials

meet the requirements of the applicable fire safety code (e.g., thermal or ignition barriers)

Remove all exterior cladding from the installation area

Seal all holes, gaps, and penetrations in existing sheathing airtight

Remove any existing insulation or protrusions that prevent full insulation contact with existing air barrier

Replace any rotten or structurally weak substrate

Insulation will either be installed fully in contact with the exterior sheathing, or a drainage plane will be installed that allows moisture to drain completely to outdoors from behind the rigid insulation

Install continuous rigid insulation to prescribed R-value using mechanical fasteners that penetrate sub-framing a minimum of 1-1/2"

Overlap seam of multiple layers a minimum of 12"

Seal all insulation seams, joints and connections in each layer with compatible sealant (caulk, tape, mastic, etc.)

Reinstall exterior cladding using mechanical fasteners over the new insulation per the manufacturer's specifications

For structures covered by the International Building Code (IBC), all exterior walls to be insulated will be assessed for provision of a thermal boundary (fire stopping) when foam insulating materials are to be used (IBC 2603.4)

Post a dated receipt signed by the installer that minimally includes: Installed insulation type, coverage area, installed thickness, and installed R-value