The pitch angle of the new roof additions were designed to be consistent with the original cottage. However most other aspects of the roof design were influenced by sunshade computer modelling analysis. Roof eave depth, gable frieze screen pitch and size, verandah roof canopy materials and roof level adjustments have resulted in a building system which provides summer shade though permits the penetration of winter sunlight. Two versions of sunshade modelling indicate the Gourlay house courtyard areas on 21st June and 21st January at 1pm.

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