cove.tool calculates the impact of different performance categories for different glazing transitions. This is valid input for the project locations in Canada.

  1. Facade thermal Inputs (W/m K): The rating of thermal performance from poor to efficient, based on similar types of details used in construction. Due to a large number of slab, parapet, and glazing transition details, separate linear transmittance ranges were created to help designers compare and model performance.

  2. Balcony Thermal Performance (W/m K): also known as Linear Transmittance, is the Heat flow coefficient representing the added heat flow associated with linear thermal bridges. As shown in the table below, use the Linear Transmittance values based on the performance category the project is aiming for.

  3. Balcony Length (ft or m): When modeling balconies, the width of the slab, indicates the length of a linear thermal bridge. In order to account for the total area of influence, use the combined approximate linear length of all areas of thermal bridging across the building envelope.

The BC Energy Code assigns a rating, from poor to efficient, based on the range of thermal transmittance between similar types of details for the glazing. The visual summary is shown in the picture below from the Building Envelope Thermal Bridging Guide

Find these facade thermal performance properties at the bottom of the Baseline Energy Page under the Envelope Tab.

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