Substrate is not Soil & Soil is not fill.

Most urban tree failures are traced back to what was in the hole. Almost none are traced back to what was written in the specification. That is the same problem seen from two ends.

A specification chain with a hole in it

A tree pit is an eighty-year piece of infrastructure delivered in a single afternoon.

When the tree fails, the material is not reassessed. The replacement goes into the same hole.

The material that goes into it is chosen by cost code, not by function.

What substrate actually is

A function, not a fill.

A specification that names substrate by trade code or price band controls none of these functions. A specification that names them by measurable threshold controls all of them.

Substrate is the root zone's operating environment. It has to carry structural load without closing to root growth. It has to hold water without going anaerobic. It has to hold nutrients without leaching. It has to host a living microbial community, or the tree cannot access what is in the substrate in the first place.

Specification Routes

Three Routes

How to get from function to specification

Municipal Specs

Projects Route

MyllaNo1

The substrate 59 Degrees supplies where the specification calls for one. Formulated to meet the ten-clause thresholds. Named on the delivery note.

Read the product specifications →

Substrate is specified inside three different documents, by three different roles, for three different reasons. Each of the three pages below is written for one of them.

The ten-clause library that makes substrate function measurable inside an AMA Anläggning document. Delivered as a 90-minute workshop, drafted live from the room's own project material. Written for municipalities, landscape architects, and procurement officers who write the language others have to defend.

Read the specification framework →

Named sites where substrate function has been specified, installed, and monitored. What was measured, what was delivered, what the ground looks like now.

See the projects record →

Discipline Note

WHAT THIS PAGE DOES NOT DO

This page does not sell substrate. It defines what has to be true of a substrate before a specification can be defended. The three routes above take that definition into three different documents.

Book a specification workshop →

Substrate is the specification.

59degrees Soil Architects

Soil architecture for biological function.

info@59degrees.com