Changes

*Where vegetation cover is poor, unhealthy or dominated by weeds and soil pH is '''lower'' than the design/product specification or Acceptance Criteria ranges, corrective action involves amending the soil with ground limestone to raise the pH back to neutrality.  

*Where vegetation cover is poor, unhealthy or dominated by weeds and soil pH is '''lower'' than the design/product specification or Acceptance Criteria ranges, corrective action involves amending the soil with ground limestone to raise the pH back to neutrality.  

*Where soil pH is '''higher'' than the design/product specification or Acceptance Criteria ranges, corrective action involves amending the soil with sulphur or [[compost]] to lower the pH back to neutrality. Amendments to [[green roof growing media]] should be prescribed by the designer, product vendor or media supplier.

*Where soil pH is '''higher'' than the design/product specification or Acceptance Criteria ranges, corrective action involves amending the soil with sulphur or [[compost]] to lower the pH back to neutrality. Amendments to [[green roof media]] should be prescribed by the designer, product vendor or media supplier.