Blue roofs contribute significantly to good SuDS design, either with or without a Green Roof finish. Blue roof systems work by providing temporary storage of storm water and controlling discharge in line with site planning conditions. Similarly to Green Roofs they are suitable for implementation on both new-build and retro-fit developments, flat roofs or podium decks with either a warm or inverted roof build up. Extensive green roof and Intensive green roof systems can be designed by ABG to meet requirements.