Roof Deck Insulation

Verify that:

roof structure is sound and can support additional weight of insulation and roofing materials installation

all roof necessary roof penetrations are complete (ventilation, plumbing vents, combustion flues, chimneys, etc.)

Remove existing roof covering down to the roof sheathing materials including all fasteners, flashing, etc.

Air seal all holes, gaps, seams and penetrations in existing roof deck

Replace any damaged or rotten roof sheathing materials

Remove any extraneous materials or obstructions from roof deck surface

Select insulation materials that have a flame spread and smoke development index of 75/450 or less when tested in accordance with ASTM E84 or UL 723

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)

Install insulation to prescribed R-value without gaps, voids, compressions, misalignments, or wind intrusions and according to manufacturer specifications

Offset the seams of multi-layer installations a minimum of 12"

Install a continuous bead of sealant along the entire perimeter of roof deck between insulation layers and roof sheathing and again at subsequent layers of insulation

Seal all seams or joints in insulation with gaskets, tapes, or equivalent material

Seal all connections, penetrations, corners, etc.

Install appropriate flashing and water management systems that direct bulk moisture off of roof and away from building

Install new roof covering in accordance with manufacturer specifications and applicable code requirements

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