– the increased height would normally be expected to add to the outward aesthetics ie viewsĥ. – the additional height should/would mean increased wind flow through all three house levels – highly valuable usable underneath space (of course this should not be built-in!) On this point, ‘proper’ stilts or pole construction at a 2.4m or such height (to meet building standards), or the equivalent construction adds two, no three, other significant advantages – Not sure 1/2/3′ counts as ‘stilts’, but i may be pedantic □ but the airflow under is useful in the climates we reference. Ditto the under-roof, albeit with different/reduced requirementsĤ. i think you greatly over-simplify the construction of the ‘over-roof’, and consider the inherent lifting wind forces under such a roof in times of storms and cyclones/typhoons.ģ. (btw, digressing, what is another name for a ‘double roof’? i have a previous word in mind, but it escapes me.)Ģ. Indeed, it seems obvious to me that both a double roof AND a reflective coating should be used together i am not sure reflective roof coatings should be considered “expensive” Imagine how much cooler your tropical home could be with that level of heat reduction.ġ. In addition, they also show that when insulation is part of the lower roof, there is an 85% reduction of heat flux from the original roof structure. In other words, about half of the heat energy did not pass through to inside the building. There only needs to be enough space and air movement to prevent the heat from the upper roof from reaching the lower one.Ī study published by Elsevier shows that the double roof system reduced heat flux by approximately 50%. The space between the two roofs can be a few inches or a few feet. However, the hot air in the space can quickly dissipate before the heat reaches the lower roof level. Therefore, heat from the upper roof passes through to the air space below it. In addition, the air space between the two layers should have an air space for ventilation. This air space is critical as this is what prevents the sun’s heat from passing through to the inside. However, they are often massing materials like concrete.Įach roof layer has an air gap between the two of them. The roof below can be similar in construction and materials. It can consist of a timber or metal frame with wood decking and a metal sheet covering. They are typically two separate structures. A double roof system consists of two roof layers or skins.
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