Insulation Entirely Above Deck - a roof
with insulation (1) installed above (outside of) the roof structure and
(2) continuous (i.e., uninterrupted by framing members); insulation is
usually rigid foam or high-density mineral fiber.
Provide high albedo roof details. See High Albedo Roofs
for more information.
Metal Building, Standing Seam - a metal roof with thermal blocks is attached to the purlins by metal attachment clips and foam is installed on top of the purlins and up against the attachment clips.
Metal Building, Screw Down - a metal roof without thermal blocks where the insulation is compressed between the roof deck and the purlins, R-13 is the maximum insulation that can be compressed with screw down roofs.
Attic Roof with Wood Joists - wood frame roof structures in which insulation is placed between structural roof members; e.g., batt or loose-fill insulation in cathedral ceilings or attic spaces.
Attic Roof with Steel Joists - metal frame roof structures in which insulation is placed between structural roof members; e.g., steel bar joists or trusses with metal webs having insulation below the roof deck.
Other - roof assemblies that do not fit in one of the above five categories (see Assembly U-Factor under Roof Software Inputs). 2009/2012 IECC: When Other is selected, you must also select a Construction Detail: Insulation Above Deck, Metal Building Roof, or Attic Roof.