Pebble vegetation barriers should be provided at all perimeters, abutments, rooflights, inspection chambers and all other protrusions. They are not suitable on roofs with a pitch greater than 9°, in this situation Bauder SS40 trim or concrete paving slabs can be used to confine the vegetation.Wind UpliftThe stability of the system is increased because the negative pressure forces that can develop during high wind conditions are counteracted by the weight of the green roof system. Wind can also lead to erosion problems on exposed sites, especially if plant establishment is in the early stages.IrrigationIrrigation will depend upon the location of the building, the local climate and the type of plants used to vegetate the roof.On our Xeroflor sedum blanket green roofs, we recommend installing a leaky pipe irrigation system where the following conditions apply: n South facing roof slopes exceeding 5° pitch.n All roof slopes exceeding 10° pitch.n Windy or exposed site locations.n Inland sites where rainfall is less frequent.On intensive green roofs, the plants must be irrigated to ensure they remain healthy during prolonged dry periods. An automated system is generally the best option in the long-term and the frequency at which it is applied will depend on the plant species.MaintenanceAll roofs require a minimum of two inspections a year to ensure that the outlets etc are maintained, regardless of the type of green roof. An intensive green roof will require the regular maintenance associated with the planting scheme and landscape design, whereas an extensive green roof will need only minimal maintenance to ensure that any unwanted species do not become established. For full details of maintenance on each of the different types of green roof, please download the information from the Technical Centre on our website, bauder.co.uk/technical-centre.Bauder strongly advises the inclusion of the cost for an initial post-installation maintenance program within the tender documents for a period to be agreed with the client's representative. This ensures that the green roof is handed over in a healthy and fully established condition.Safe Rof AcesProvision should always be made for safe access to the roof for routine maintenance, which may include man-safe systems with harness and attachment points, internal access hatches or an externally mounted bracket to secure a ladder. As all green roofs will need to be to be accessed at least twice a year for routine maintenance, it is a fundamental requirement of the design of the roof structure that safe access is provided for. The two important points are; safe access on to the roof by people and maintenance equipment and the safety of individuals once on the roof, ie handrail balustrades at the correct height, stable surfaces that are slip resistant etc."London's most underused asset is just above our heads. Living roofs, green roofs, terraces and roof gardens can benefit individuals and society as a whole, by creating new outdoor spaces, enhancing biodiversity, reducing flood risk (by absorbing heavy rainfall), providing insulation and making our city more beautiful."Lord Richard Rogers, 131 bauder.co.ukSalt Grammar SchoolBradfordSalt Grammar SchoolBradfordVegetation BariersThese provide several important functions in a green roof:n Protection of the vegetation layer from water running down vertical upstand surfaces or from higher level rainwater downpipes.n Provide rapid surface drainage during heavy rainfall.n Reduce and ease routine maintenance.n Protection of the waterproofing from mechanical damage during maintenance.n Fire break.n Wind uplift resistance by increasing the imposed load at roof perimeters.GREEN ROOFLANDSCAPING
REINFORCED BITUMEN MEMBRANE BTRS PLANT EBauder Plant E Cap Sheet is a chemically treated, root resistant torch bonded, elastomeric bitumen cap sheet featuring a spunbond polyester reinforcement. Bauder G4E Underlayer is a heavy duty elastomeric bituminous membrane with 200g/m² woven glass fibre reinforcement, which ensures an extremely high tensile strength of greater than 1200N/50 mm. BauderPIR Flatboard Insulation is highly thermally efficient, lightweight, fire resistant and zero ODP rated. The insulation has mineralised glass fibre facings on both sides to enable it to receive the torch applied underlayer. Bauder VB4 Expal Vapour Barrier is a heavy-duty torch bonded elastomeric membrane incorporating tear resistant aluminium lining to ensure complete impermeability against water vapour.REINFORCED BITUMEN MEMBRANE BTRS ROOTBARBauder Rootbar Cap Sheet is a mechanical and chemically treated, root resistant torch bonded, elastomeric bitumen cap sheet featuring a copper core. Bauder K5E Underlayer is a heavy-duty elastomeric bituminous membrane with a 250g/m² polyester reinforcement, which ensures an extremely high tensile strength of greater than 800N/50 mm. BauderPIR Flatboard Insulation is highly thermally efficient, lightweight, fire resistant and zero ODP rated. The insulation has mineralised glass fibre facings on both sides to enable it to receive the torch applied underlayer. Bauder VB4 Expal Vapour Barrier is a heavy-duty torch bonded elastomeric membrane incorporating a tear resistant aluminium lining to ensure complete impermeability against water vapour. Bakor 790-11 Hot Melt structural waterproofing suitable for plazas and terraces Inverted Insulation with a thickness to suit the U-value required. Bauder API Access Protection Sheet to suit the proposed landscaping, fully bonded into the Bakor 790-II. Bakor 790-II second 3 mm layer bleeds through the reinforcement to create a 6 mm monolithic waterproofing membrane. Bauder Polyester Reinforcement strengthens the system, providing a uniform surface to apply the second layer of hot melt. Bakor 790-II, first 3 mm layer infills and fully bonds to all minor deviations in the deck. Bauder Polymer Primer dries quickly, promoting nearly a 50% increase in bond strength compared to a normal primer. bauder.ie132WATERPROOFING OPTIONSThere are different waterproofing systems available to suit the individual project criteria for the green roof, its landscaping options, weight loading limits, performance and durability requirements. Please contact us so that a technical advisor can take you through the system best suited to your project.