Hoping to collect some advice on this. Our current hospitality project's low-sloped rooftop (approx. dimensions 13.8mx20.0m) is underneath a shading layer (approx. dimensions 18.7mx 20.0m). The shading material is a lightweight mesh material / perforated tensile fabric and serves a primarily as an aesthetic and dappled shade provider for the external terrace spaces. The tensile mesh material will be a sandy / beige colour while the rooftop will be a beige / light colour (SRI values from manufacturers still pending).

When calculating the rooftop areas and collecting the corresponding SRI values, can i ignore the shading material and use the actual structural roof top material only or will the shading material need to also comply with the initial SRI of 82?

Thanks for your help!

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Francis Porter

LEEDuser Basic Member

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Wed, 10/28/2020 - 05:53

Hi Sabrina - I have a similiar question. I have found that https://www.usgbc.org/leedaddenda/2627 suggest that the "the roof surface required to meet the credit requirements is the roof that would contribute towards the heat island effect" e.g. "the outer most roof surface of the enclosed space would be the roof that would be required to meet the credit requirements". Keen for the views of others. The above LI appears to assume that the top layer has 100% opacity. Expanding on this question how have other projects approached dappled shading as a layer? Have they used a weighted average based on the SRI and the % opacity of multiple layers?

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