The cost will vary with the green roof system and the particular situation. On top of a shed or garage they make a great talking point. They still need conventional insulation, and rainwater run-off will still need to be dealt with, but they offer good ecological benefits, are cheaper to install, easier to maintain and have good visual appeal. Any growing medium will attract other species – that is sort of the point – and maintenance is likely to remain an issue whatever system you install, but the thinner extensive systems are generally the right choice for most domestic situations. The thicker intensive systems are really for specialist applications - buildings that want to make that big statement about their eco credentials. They offer less water retention and insulation, but are easier to install and maintain. Extensive and semi-extensive roofs are less of a problem. Intensive systems and meadow roofs need to be designed in, as they are heavy and the supporting structure needs to be designed to carry the weight. It is also relatively low-maintenance.Ī meadow roof brings this single storey extension from Archic to life, while also improving the space's insulation. Semi-extensive systems have slightly greater depth than extensive systems (100-200mm) but constructed on the same principles to allow for a greater diversity of plants. The insulation quality is relatively low and extensive systems always incorporate conventional insulation. These lightweight systems require little maintenance. They offer good insulation and better water absorption than the thin types, but need a lot of care.Įxtensive green roofs are generally made up of a shallow layer (20-100mm) of substrate planted with low-growing, stress-tolerant grasses, mosses and sedum. They provide a valuable habitat for wildlife but place significant weight on the building and need substantial roof support. These need to be accessible gardens (for maintenance) and can even be used as a recreation space. Intensive systems consist of a thick layer of soil (50-200mm+) in which a variety of grasses, herbs, flowers and shrubs can grow. Don’t leave sod overhanging the roof edge.There are three basic types of green roof: intensive (thick), extensive (thin) and semi-extensive (somewhere in between). Where necessary, use your utility knife to cut the sod pieces to fit. Place sod pieces on top of the potting soil layer across the roof. The middle is a one-inch thick layer of gravel. The first and top layers are one-inch thick potting soil. Three under layers are needed before applying sod. Carefully attach the pond liner to the roof, applying a staple along the edge in equidistant spots using a staple gun. Use a knife to cut the pond liner to size. Make sure to overlap the individual liners to keep water out. Once the waterproof paint has dried, lay the pond liner across the roof. Allow 24 hours for drying time before proceeding with the project. Waterproof PaintĬoat the roof with a layer of waterproof paint to prevent damage when applying the sod, preferably applying it with a power sprayer. The exterior edges of the roof should be lined with wood three inches tall, securing them using a staple gun. You might need to employ a roofer to prepare your structure for a sod roof. If a professional assessment is needed, hire a local roofing professional to evaluate your roof. Also, make any necessary repairs looking for damage done by water, rotten wood and other areas of concern. Make sure the structure you want to roof can handle the weight.
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