Insulated Wood Roof Decking

Inspect the roof assembly to ensure it has proper drainage protection above the roof deck.

Insulated wood roof decking.

Zip system r sheathing is the simple all in one structural panel with built in exterior insulation. The ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions. Largest manufacturer and least expensive sip panels on the market. The roof deck is cold wood decks without insulation above them will readily equilibrate to the exterior temperature.

This gives a 1 air space between the roof deck and the insulated area. We then vented that space through the roof deck as was the normal practice for roofing. During cooler night times and in winter periods the deck temperature can then be below the dew point of the interior air. Insulation above the roof deck or air vapor impermeable insulation below the roof deck is needed for condensation control in an unvented roof.

The moisture content of the wood prior to applying spray foam insulation should be measured to ensure it has dried to below 18 or to the levels recommended by the spray foam manufacturer.