Extensive Substrate Systems
The opportunity to specify a substrate system allows for a greater depth of growing medium providing an extended choice of suitable plants for the client. It can also provide a cost effective solution for larger roofs. Vegetation options >>>
Manually planting individual sedum or other plants grown in plug format into the substrate gives the client both a very much greater choice of plant species and the opportunity to plan the layout. This can be of particular benefit when the roof is to be overlooked and where the areas to be greened are partially or wholly in shade. A variety of plug plants are available from Bauder, go to the vegetation section for more details >>>
If immediate full coverage is required, the use of a vegetation blanket is the best practical solution. Vegetation blanket is grown on a base carrier, harvested in the field and delivered to site in rolls for quick and easy installation over the substrate. Whilst an establishment period of at least 12 weeks is required, the vegetation in the blanket will flourish over this period provided that the initial maintenance programme of watering is adhered to.
Hydroplanting a roof can be a fast, economical and practical method of planting very large areas. A mix of seeds and cuttings is applied to the growing medium and a fine cellulose mulch/fertilizer mix is sprayed over the surface. Plant establishment and full coverage can take between 18-30 months to achieve depending upon the time of year planting takes place, the density of the cuttings/seed mix spread and the weather conditions during the period of establishment.
It should be noted that extensive green roof systems are not intended for general access or leisure purposes and are primarily used for their ecological benefits or aesthetic appearance.