Attachment B Green Roof Plan

4        Maintenance




                                                 Task                                     Frequency                                  Frequency                         Maintenance Requirements
                                                                                          Establishment Period (2- 5yrs)             Post Establishment
    Item / Maintenance Objective                                                                                                                                       All green roofs require higher levels of maintenance in the first 2-5 years of establishment until colonization has occurred and the vegetation has
    Maintenance check point:                     Flood roof to check for any leaks /      One off.: After waterproof membrane        n/a                               stabilized. Based on existing exemplary green roof projects, green roofs are not set and forget. It takes time to get plants, irrigation and maintenance
                                                 weaknesses in the membrane.              has been installed - prior to installing                                     right and adjustments will be inevitable.
                                                                                          remaining components.
    1.   Irrigation                              Ensure automatic irrigation is suffi-    2-3 x per week during dry periods          As required during extended dry   Once plants are installed on the roof regular monitoring of all components and plants is essential.
                                                 cient to maintain substrate moisture     (June - Dec) (varies according to rain-    periods ( approx. June - Nov)
                                                 levels for optimum plant growth.         fall / temperatures )
                                                                                                                                                                       “Extensive green roofs require maintenance for first 2 years to ensure vegetation has stabilised and there are no competing weeds. Beyond the first 2
    2.   General maintenance (i.e Pruning /      Maintain substrate levels, especially    2 x per year                               Minimal - as required
                                                                                                                                                                       years, maintenance is minimal and may only be required once or twice annually.” Green Roof Design Resource Manual. p. 3.1
         weeding)                                on sloping areas and top dress
                                                 where needed.
                                                 Remove weeds by hand.                                                                                                 The maintenance contractor must be clear about the maintenance objectives and their capacity to complete this with the available resources. The
                                                 Prune shrubs and grasses to main-                                                                                     proposed design must be fully evaluated in terms of the maintenance it will entail.
                                                 tain dense leafy form.
                                                 Remove waste plant material.
                                                                                                                                                                       A key challenge for maintaining the green roof is ensuring that plants are getting enough water for the desired level of growth, while also avoiding water
    3.   Pest control                            Inspect for signs of pest or disease     4 x per year (quarterly)                   Minimal - as required
                                                                                                                                                                       logging in the soil. Table 1 shows the annual rainfall for the Noosa area where dry periods extend from June through to November.
                                                 and treat only as required.
    4.   Fertilising / Monitoring of plant       Apply slow release complete fertilis-    2 x per year (6 monthly) At the be-        Minimal - as required             Refer to Figure 5 for a preliminary maintenance regime.
         nutrition                               er to ensure adequate nutrient levels    ginning of Spring prior to high rainfall
                                                 for plants, in accordance with soil      period and 6 months later.
                                                 scientiest recommendations.
                                                 Maintain a log of fertiliser additions                                                                                Fertilising
                                                 and records of pH levels before and
                                                 after fertilising.
                                                                                                                                                                       “Fertilising can be a useful method for increasing the rate of spread of pioneer dune-stabilising plants over bare areas”. QLD Govt. Environmental
    5.   Plant evaluation / renewal to improve   Replace dead plants and infill plant     As required
                                                                                                                                                                       Protection Agency. Natural coastal dune systems typically have low levels of plant nutrients however fetiliser applications will be necessary to provide
         planting design                         to maintain dense cover
                                                                                                                                                                       desirable nutrient levels for establishment of plants once pre-planted trays are installed on the roof.
    6.   Maintain irrigation system              Manually test and inspect irrigation     Weekly during dry periods / monthly at
                                                 system and make seasonal adjust-         other times
                                                 ments. Check:                                                                                                         Broad leaved herbaceous dune plants such as Ipomoea pes-caprae and Spinifex sericeus require fertiliser containing predominantly nitrogen. A natural
                                                 - volume of water delivered                                                                                           slow release fertiliser containing Ammonium nitrate, 34% N, is the preferred form of use for coastal native species. QLD Govt. Environmental Protection
                                                 - frequency                                                                                                           Agency. Specific product specification and application rates will need to be determined by soil scientist.
                                                 - substrate moisture content

                                                                                                                                                                       Fertiliser levels need to be monitored and altered accordingly to allow for inconsistent growth of plants due to varying shade levels and leaching of
    7.   Maintain non vegetated zones and        Remove vegetation from perimeter         4 x per year                               2 x per year
         waterproofing                           zones and around other equipment
                                                                                                                                                                       nutrients from the substrate during high rainfall periods.
                                                 and fixtures.
                                                 Inspect flashings over waterproofing
                                                 membrane terminations, wall fabric
                                                 for damage.
                                                 Conduct leak detection of water-
                                                 proofing if possible.

    8.   Maintain drainage                       Remove dirt, litter and other depos-     4 x per year                               2 x per year
                                                 its from roof drains and gabion cage
                                                 intercept drains to ensure they are
                                                 clear and functioning


Figure 5- Preliminary Maintenance Regime



                                                                                                                                                                                                                                                                              Green Roof Proposal
                                                                                                                                                                                                                                                                                                 Date : 24.09.2014
                                                                                                                                                                                                                                                         Hasler Residence, Seaview Terrace                                     A