Opportunities for hemp in Cape Town and South Africa’s construction materials value chain

The document identifies industrial hemp as a sustainable alternative for construction materials in South Africa, specifically focusing on hempcrete and hemp insulation. It highlights Cape Town's potential as a hub for these materials, citing the completion of the world's tallest hemp-based building. While hemp offers significant carbon sequestration and energy efficiency benefits, the sector faces barriers including high costs due to imported components and a lack of awareness among developers and professionals.

• Industrial hemp is positioned as a sustainable input for the construction sector to help reduce the global building industry's greenhouse gas emissions, which account for approximately 40% of global totals.
• Hempcrete acts as a carbon sink, sequestering an estimated 108 kg of carbon dioxide per cubic metre over the building's lifespan. For a house using 50 m3 of hempcrete, 5.4 tonnes of CO2 would be sequestered, compared to 48 tonnes of CO2 emissions for a cement-walled house.
• Hemp insulation demonstrates high thermal resistance (R-value of 3.5), surpassing most conventional materials except polymer insulation. Anecdotal evidence from a South African metro feasibility study suggests its use in RDP houses could reduce heating costs by 60%.
• Cape Town is identified as a potential hub for hemp construction materials, already hosting two companies selling hempcrete, hemp plaster, and hemp insulation, and the 'Hemp Hotel', which is the world's tallest building to use hemp-based materials with 54 rooms across 12 storeys.
• The South African hemp construction sector is hindered by high costs, with hemp-based materials averaging 20% more expensive than conventional options. This is exacerbated by the need to import hemp hurd; local procurement could potentially reduce prices by 40%.
• Significant barriers to adoption include a lack of awareness among developers and risk aversion among architects and civil engineers due to professional liability for structural performance.
• President Cyril Ramaphosa stated in 2022 that the broader cannabis industry in South Africa could create over 130,000 new jobs and be valued at R406 billion by 2026.

APA

GreenCape (n.d.). Opportunities for hemp in Cape Town and South Africa’s construction materials value chain. https://greencape.co.za/wp-content/uploads/2023/06/CCT_Smart-Agri-3_Hemp-in-construction-materials-value-chain-industry-brief.pdf

Chicago

GreenCape. Opportunities for hemp in Cape Town and South Africa’s construction materials value chain. n.d. https://greencape.co.za/wp-content/uploads/2023/06/CCT_Smart-Agri-3_Hemp-in-construction-materials-value-chain-industry-brief.pdf.

Wikipedia

{{cite report |author=GreenCape |title=Opportunities for hemp in Cape Town and South Africa’s construction materials value chain |url=https://greencape.co.za/wp-content/uploads/2023/06/CCT_Smart-Agri-3_Hemp-in-construction-materials-value-chain-industry-brief.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{greencapendopportunities, author = {{GreenCape}}, title = {{Opportunities for hemp in Cape Town and South Africa’s construction materials value chain}}, institution = {GreenCape}, url = {https://greencape.co.za/wp-content/uploads/2023/06/CCT_Smart-Agri-3_Hemp-in-construction-materials-value-chain-industry-brief.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }