Changes

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====Roof====

<h4>Roof</h4>

<p>Flat roofs should be graded without depressions, with positive drainage ≥2% (1:50) towards roof drains.  For roofs with pitch greater than 10% (1:10) additional check dams or cellular components should be included in the design. These structures reduce the flow rate of the draining water, and help to stabilize green roof components. Green roofs can be installed on slopes greater than 20% (1:5), but specialized design advice should be sought for the addition of components required to secure the green roof in place. </p>

<p>Flat roofs should be graded without depressions, with positive drainage ≥2% (1:50) towards roof drains.  For roofs with pitch greater than 10% (1:10) additional check dams or cellular components should be included in the design. These structures reduce the flow rate of the draining water, and help to stabilize green roof components. Green roofs can be installed on slopes greater than 20% (1:5), but specialized design advice should be sought for the addition of components required to secure the green roof in place. </p>

<p>Extensive green roofs do not require additional insulation layers. The underlying roof may be of  warm, cold or inverted design. </p>  

<p>Extensive green roofs do not require additional insulation layers. The underlying roof may be of  warm, cold or inverted design. </p>