Green Roof Considerations

Pitched green roof design considerations green roofs are suitable for any pitch of roof.

Green roof considerations.

An architect s guide to. A robust and durable roofing system is necessary to provide a solid foundation for green roofs. A green roof can also expose the roof membrane to chemical inputs e g. Precipitation generally runs off the roof of a building into gutters and flows into a storm sewer.

The increased urbanization of towns and cities has resulted in less green space and more impervious surfaces. It is vital that the protection of the building s fabric and in particular its waterproofing is considered in the green roof design. Challenges associated with installing green roofs on new or existing buildings if not properly reviewed or addressed can increase costs and deter owners from installing such roofs. The entire green roof assembly including plants and the water required to saturate the growth media is considered part of the dead load of the structure.

There are three basic types of green roofing systems to consider when designing your project. Green roofs main types. There is no steepest pitch for a green roof they can even grow vertically. To deliver a successful green roof the designer must consider the building s position and location along with the orientation of the roof during the day and any shade from surrounding buildings.

However when dealing with a sloped green roof with a pitch of more than 9 5 you ll need a design solution for retaining water and ensuring the substrate stays in place. Green roofs for healthy cities grhc is the north american industry association for the green roof and wall sectors. A green roof also helps control storm water runoff and retention. The height of the green roof system build up.

Other considerations in addition to potential costs and benefits can influence building owners acceptance of green roofs. The maximum saturated load of the green roof. Water in excess of that which saturates the growth media snow and people visiting the green roof are all considered part of the live load of the structure. What to consider before installing a green roof on a historic building.

The first issue to resolve when considering any green roof is what is the primary purpose for installing a green roof is it primarily for energy efficiency for storm water control for heat island reduction for visual enjoyment or other reasons. Fertilizer aggressive roots and increased foot traffic. Design considerations for a successful green roof for a green roof to flourish it requires suitable amounts of sunlight water sufficient drainage and aeration to encourage healthy plant growth.