testing to  est  and   est methods or eternal fire eposure to roos oo out or a classification o no fire penetration o the green roo system in a one hour physical fire test and as or certificates


WHAT IS SUBSTRATE?


his means the material the plants grow in its composition and depth varies rom system to system and can heavily impact the roos longterm perormance he  reen oo ode wwwgreen- rooorganisationorg lays out recom- mended minimum depths for different systems, starting rom  mm e thin that  mm is the ideal depth or a modular green roo, allowing optimum space or healthy roots he reen oo ode also discusses the content o substrates and advises that they should comply with  pecification for performance parameters and test methods or green roo sustrates n


independent laoratory test showing that the sustrate complies with  should e provided y the roo supplier


WHAT PLANTS CAN I HAVE ON A


GREEN ROOF? Traditionally sedum plants have been the goto or green roo manuacturers, because these super hardy succulents are droughttolerant and more than capa- le o thriving in harsh weather condi- tions hey orm a yearround carpet o greenery with springsummer owers and rilliantly asor caron dioide or seluilders and home renovators wanting something more unusual, theres the option o native ritish wildower mies, which deliver a more natural finish with greater seasonal variation in appearance heres a growing trend or this style o green roo, with some manuacturers reporting that their wildower mies are now outselling pure sedum systems he est systems oer a mi o wildowers and sedum to ensure allyear greenery


CAN I ORDER MY GREEN ROOF IN


ADVANCE? Yes i you are installing a modular system, proaly not i its a rollout solution Modular systems, because they come


Traditionally sedum has been the go-to for roof suppliers because these super hardy succulents are drought-tolerant and more than capable of thriving in harsh weather conditions


completely self-contained within trays can, if necessary, be unpacked and left on the ground until reuired lements of a roll-out system can be stored but the sedum layer must be unfurled within 24 hours of delivery to ensure healthy plants or this reason, it is also impor- tant to consider the time spent in transit o your green roo, modular or rollout  let too long on transport crates  we advise a maimum o  hours  enymes egin to rea down the plants


DO I HAVE TO LOOK AFTER MY


GREEN ROOF? Green roofs are low maintenance but not no maintenance he plants will tolerate etreme conditions ome green roos are over  years old, and thrive world- wide in a wide variety of climatic condi- tions) but you should expect to carry out twice yearly maintenance, including applying a slow release ertiliser or est yearround results n etremely dry con- ditions it may be necessary to water the roo  or fit a simple irrigation system as part o the overall installation


Julian Thurbin is managing director at Wallbarn


8 www.sbhonline.co.uk mar/apr 2022


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