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IS 9096:2006 is the Indian Standard (BIS) for preservation of bamboo for structural purposes - code of practice. This standard outlines the methods for preserving bamboo for structural use to protect it from bio-deterioration. It covers the selection and preparation of bamboo, types of chemical preservatives (like CCA and CCB), and details various treatment processes such as Boucherie, steeping, and pressure impregnation, specifying required preservative retention levels for different applications.
Preservation of bamboo for structural purposes - Code of practice
! Treatment is most effective on green bamboo, ideally within 24-48 hours of felling, as sap facilitates preservative distribution.
! Ensure nodes/diaphragms are punctured before non-Boucherie treatments to allow preservative to flow through the culm.
! Handling chemical preservatives like CCA requires strict safety precautions, including appropriate Personal Protective Equipment (PPE) and adherence to disposal guidelines.
ISO 22156:2021International Organization for Standardization (ISO), Switzerland
HighCurrent
Bamboo — Structural design
Annex D of this design standard provides detailed guidance on bamboo durability and preservation, covering many of the same principles.
NSR-10, Título GAsociación Colombiana de Ingeniería Sísmica (AIS), Colombia
HighCurrent
Reglamento Colombiano de Construcción Sismo Resistente, Título G – Estructuras de Madera y Estructuras de Guadua
Contains a comprehensive and mandatory section on preservation methods and requirements specifically for structural Guadua bamboo.
ASTM D7997-15ASTM International, USA
LowCurrent
Standard Test Methods for Determining Preservative Treatment of Bamboo
Focuses exclusively on testing methods to verify preservation, rather than the code of practice for application, but is directly related.
NTP 251.100:2016Instituto Nacional de Calidad (INACAL), Peru
HighCurrent
BAMBÚ. Preservación. Código de práctica (BAMBOO. Preservation. Code of Practice)
As a national code of practice for bamboo preservation, its scope directly aligns with IS 9096.
Key Differences
≠IS 9096 explicitly lists and provides retention values for arsenic-based preservatives like CCA (Copper Chrome Arsenate), which are heavily restricted or banned for residential use in many regions covered by international standards (e.g., USA, Europe) due to health and environmental concerns.
≠Modern international standards like ISO 22156 often use a formal Use Class or Hazard Class system (e.g., UC1, UC2, UC3) to systematically determine the required level of preservation. IS 9096 uses a descriptive approach based on exposure (e.g., 'not exposed to weather', 'in ground contact') which is less formalized.
≠IS 9096 is a standalone code focused solely on preservation. In contrast, ISO 22156 and NSR-10 integrate preservation as a crucial component within a broader, more holistic structural design standard.
≠IS 9096 gives specific concentrations for Boucherie process using Copper Sulphate (10%), a practice less common internationally now due to its corrosivity and high leaching potential compared to borates.
Key Similarities
≈Both IS 9096 and international standards (like ISO 22156) strongly advocate for the use of Boron-based preservatives (Boric Acid-Borax) as an effective, low-toxicity treatment for bamboo used in low-to-medium hazard conditions.
≈All standards recognize the critical importance of seasoning bamboo to a specific moisture content (typically below 20-25%) before chemical treatment to ensure proper absorption and effectiveness of the preservative.
≈The fundamental methods of treatment, including non-pressure methods like immersion (dipping) and sap displacement (Boucherie process), and industrial pressure impregnation processes, are common to both IS 9096 and international practice.
≈The primary metrics for assessing the quality of treatment are consistent, focusing on preservative retention (measured in kg/m³) and the depth/completeness of preservative penetration into the bamboo's permeable tissues.
What are the main approved chemical preservatives for bamboo?+
Copper-Chrome-Arsenic (CCA) and Copper-Chrome-Boron (CCB) are the primary water-borne preservatives specified (Clause 4.2).
What is the minimum preservative retention for bamboo in a permanent structure?+
For CCA or CCB, a minimum retention of 8 kg/m³ is required for permanent structural use (Table 1).
What is the Boucherie process?+
It's a sap displacement method where preservative solution is pushed through a freshly cut bamboo culm under hydrostatic pressure, suitable for green bamboo (Clause 5.2.2 and Annex A).
Can dry bamboo be treated?+
Yes, partially seasoned bamboo with a moisture content of 25-30% can be treated effectively using pressure processes (Clause 5.3.1).