When it comes to embodied carbon of buildings (i.e carbon footprint of a structure while it is being built), Cross-Laminated Timber (CLT) is widely seen as a viable alternative to using concrete and steel in architecture. Architects speaking at the Architecture of Emergency summit in London in September 2019 have been quite vocal about the need for timber to replace concrete.

But there is another reason that is just as compelling. Responsibly sourced timber is a renewable resource whereas sand and gravel are not renewable resources, even when they are sourced responsibly. Although it is not yet widely recognised, these materials will not be replenished in our lifetimes or those of our children. We can open up new mining concessions, but it is still 'mining' and we must remember that it is the largest mining endeavour on Earth with wide-ranging impacts on people and the planet! Mining sand indiscriminately leaves behind an impoverished world for future generations. Considering that concrete is 60-75% sand and gravel, the case for alternatives keeps getting stronger.

The use of CLT in structures is growing in many places. However, in the UK, progress is threatened by a proposal to ban the use of combustible materials in and on external walls of buildings. This proposed law is a step in the right direction as far as occupant safety is concerned. However, it is not nuanced enough for the climate crisis and the potential sand crisis that looms large over the horizon. Mass timber can be surprisingly fire-resistant and can outperform steel in a fire. It meets industry standards and it is a renewable resource. This ban could throw the baby out with the bathwater.

When the UK Government held a consultation last year, they received only 2 responses. Let’s ensure this year’s consultation is not a wasted opportunity. The Architects Climate Action Network (ACAN) have put together a very helpful set of resources on their website that makes the task easy. The Timber Trade Federation is happy to respond to specific questions too.

If you are a practising architect in the UK or know someone who is, let’s please respond to the government’s consultation before Monday 25th May. Law can be a powerful lever for change at scale. Even if you have nothing to do with Architecture, you can help by sharing this blog widely.

Cover Image credit: ACAN and Dezeen