M02: Roof Construction

Intention

To select a roof specification with a lower embodied energy than the typical specification. The roof slab specification matching the actual building design must be entered in the software.

Approach/Methodologies

The design team must select the specification that most closely resembles the roof specified, and enter the thickness and steel rebar content, which are requirements of EDGE. Where there are multiple specifications the predominant specification must be selected.

In the Energy tab, a weighted average must be used for specifications such as solar reflectivity and U-value. This applies for green roofs as well. To specify a green roof, adjust these values in the Energy tab: (1) reflectivity of the roof (use the default of 70% if actual value is not available) and (2) insulation of the roof (U-value) to define the green roof condition. In the Materials tab, under roof insulation, select the insulation type used in the roof assembly.

Potential Technologies/Strategies

The following is a list of specifications included in EDGE. The user should always try to select the specification that most closely resembles that of the building design.

Relationship to Other Measures

The selected roof specification will impact the thermal insulation of the roof surface, so the energy efficiency could be adversely affected or improved by selecting different roof specifications.

Assumptions

The base case assumption is that the roof is constructed of a 200mm in-situ reinforced concrete slab.

Compliance Guidance

Design Stage	Post-Construction Stage
At the design stage, the following must be used to demonstrate compliance:  A section drawing of roof showing the materials and thicknesses; or  Manufacturer’s data sheet for specified building material; or  Bill of quantities with the materials used for roof construction clearly highlighted.	At the post-construction stage, the following must be used to demonstrate compliance:  Date stamped photograph of the roof taken during or after construction; and Purchase receipt for the building materials used for roof construction; or Delivery note for materials used for roof construction.

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