Extensive Roofs

An extensive green roof is a light weight, low maintenance choice good for large areas. It can be planted using one of the following methods:

Modular

A modular system usually combines several of the green roof’s layers into pre-manufactured and often pre-planted systems and placed directly on a roof that has been prepared with the proper water proofing membrane. There are a number of manufacturers of green roof modules allowing for choices in size, weight and plant variety. A modular green roof allows for fairly easy alterations and additions, with easy access to the roof surface below.

Planted in Place

This type of green roof allows for greater flexibility in design and plant choice. After the proper water proofing and root barrier placement, the planting medium is spread on the roof, then plants are added.

Mats

Laid much like carpet or grass sod, mats are grown off site then cut and transported to the site. They are then placed on the roof to provide complete coverage. Mats will grow together to form a solid looking green roof over time given the proper care.