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BS 8616:2019

BS 8616:2019

$142.49

Specification for performance parameters and test methods for green roof substrates

Published By Publication Date Number of Pages
BSI 2019 30
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This British Standard specifies requirements for the testing of substrates (the growing medium) for constructed green roofs intended to provide long term support for specified plant communities. This includes extensive and intensive green roof substrates.

This British Standard provides methodologies for testing green roof substrates covering the complete application range, and recommended specifications for physical and chemical characteristics considered to be optimal for extensive substrates.

This British Standard only addresses methods and parameters to ensure that the substrate used does not become a limiting factor for successful green roof installation. It does not address the wider range of other design considerations, such as the supporting structure, construction, planting options or post-build maintenance.

It is recognized that there are green roof systems that do not incorporate a substrate layer and these are not covered in this British Standard.

PDF Catalog

PDF Pages PDF Title
5 Foreword
7 0 Introduction
8 1 Scope
2 Normative references
3 Terms and definitions
11 4 Sampling substrates (for both intensive and extensive blends)
4.1 General
4.2 Sampling from stockpiles
Figure 1 — Sampling from flat stockpiles
12 Table 1 — Target ranges of extensive green roof substrate physical and chemical properties
13 5 Method of test for determination of the particle size distribution and organic matter content, as loss on ignition (LOI), of green roof substrates
5.1 Principle
5.2 Apparatus and reagents
5.3 Procedure
14 Table 2 — Sampling times for silt plus clay content determination with the pipette method (20 cm sampling depth)
15 Table 3 — Sampling times for clay content determination with the pipette method
6 Method of test to determine the physical properties of green roof substrates: oven dry bulk density, bulk density at field capacity, hydraulic conductivity, field capacity, particle density and porosity
6.1 Principle
6.2 Apparatus
16 6.3 Procedure
Figure 2 — Apparatus set up for cylinders
17 Figure 3 — Arrangement for saturated hydraulic conductivity measurements
6.4 Calculation of result
19 Table 4 — Temperature correction factor for viscosity of water at 5 oC
20 7 Method of test for the analysis of green roof substrate pH
7.1 Principle
7.2 Apparatus
7.3 Procedure
21 8 Method of test for the determination of electrical conductivity in a calcium sulphate solution extract of green roof substrate
8.1 Principle
8.2 Apparatus and reagents
8.3 Procedure
9 Method of test for the determination of green roof substrate nitrogen content and C:N ratio
9.1 Principle
9.2 Apparatus and reagents
22 9.3 Procedure
9.4 C:N ratio
10 Method of test for the analysis of green roof substrate potassium extractable by 0.5 M acetic acid solution
10.1 Principle
10.2 Apparatus and reagents
23 10.3 Procedure
11 Method of test for the analysis of green roof substrate phosphate-P extractable by 0.5 M acetic acid solution
11.1 Principle
11.2 Apparatus and reagents
24 11.3 Procedure
12 Method of test for the analysis of green roof potential phytotoxins: copper, zinc, nickel, lead and cadmium, extractable by 0.05 M EDTA using atomic absorption spectrophotometry
12.1 Principle
12.2 Apparatus and reagents
25 12.3 Procedure
13 Method of test for the identification of foreign objects within a green roof substrate sample
13.1 Principle
13.2 Procedure
26 Annex A (informative)  Substrate sampling and categories
28 Bibliography

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BS 8616:2019
$142.49