Green Roof Design Tables

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Green roof design tables.

Intensive style green roofs are the most detailed and strongest of them all. Green roof courtyard with skylights architect. Let s consider a basic gable wood roof framing design. Kuhn design guidelines for green roof 5 the growing medium is often soil based ranging in depth from 20 60 cm 8 24 with a saturated weight increase of between 290 967 7 kg m2 60 200 lbs sf.

There are three main types of green roofs which are characterized by the types of planting and vegetation that can be placed on them. The venny green roof has shallow substrates on two types of roof the first roof is on shipping containers and is designed for a dead load of 250kg m 2 and live load of 100kg m 2. The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2. Green roofs are also divided into different types depending on the green roof design scheme.

The cooling effect of these cold roofs is maintained with the help of specific layer construction. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Here the thermal insulation is installed directly above the waterproofing layer. Here we have a wood framed gable roof.

Green roof resourcesmost information on green roofs is aimed at big buildings but a few solid residential resources exist. Low tech options for greener living by nigel dunnett dusty gedge john little and ed snodgrass mostly for its overview and achievable examples. First grab small green roofs. A deeper or more specialized.

Liveroof has developed the following technical details for use in plans and to accompany specifications please contact us for support in determining which details are most pertinent to your individual project. 4 1 siting and design. Continuing on from part 3. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

Zeidler roberts photograph courtesy of m. Due to the increased soil depth the. Implementation and maintenance of green roofs. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

It is designed to influence green roof design and encourage acceptance of green roofs and aims to keep building owners from missing opportunities to benefit their own and their community s financial environmental and social bottom lines through the installation of green roofs.