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Healthy Trees- Sustainable Landscape ASLA National Conference 2008 - page 37 / 51

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Sustaining Roots- Design Guideline for Preserving Trees in Construction Grade Fills

The purpose of the Root Aeration Mat (RAM) is two-fold: 1) Provide atmospheric gas exchange, 2) Stabilize and spread the load.

Roots of trees for the most part require porous soils

No soil should ever contact that part of the tree normally above ground

The project forester will design the appropriate venting system to fit the site and objectives

For installation under structural fills the review of a geotechnical professional is required

For structural fills typically 24” is minimum needed between existing grade and proposed finish grade of pavement

Resolve additional pertinent design/construction issues

All work within the CRZ shall be laid out by the project forester or arborist and reviewed by the landscape architect/ civil and site superintendent

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