11. What’s Really Inside Your Sofa? The Truth About Healthy, Natural Furniture

Episode 11: What’s Really Inside Your Sofa? The Truth About Healthy, Natural Furniture

In this episode of Design with Impact, Alex sits down with Christine Sintermann, co-founder of Biosofa, to explore what’s really hiding inside the upholstered furniture we bring into our homes.

After discovering the amount of plastic, petroleum-based foam, and synthetic materials used in conventional sofas, Christine and her husband set out to create a different kind of furniture—one built around natural materials, repairability, and circular design.

Together, they unpack the health and environmental impacts of conventional furniture, the problem with greenwashing in the industry, and why interior designers need to look beyond aesthetics and start asking what’s inside the products they specify.

If you’ve ever wondered how to source healthier furniture, avoid misleading sustainability claims, and create spaces that support both people and the planet, this episode is for you.

What You’ll Learn in This Episode:

• How Christine’s journey into sustainable furniture began
• What’s inside a typical mass-market sofa—and why it matters
• The health and environmental concerns surrounding petroleum-based foam and synthetic materials
• Why furniture waste and microplastics are becoming a growing issue
• What you would actually find inside a Biosofa, including natural latex, jute, certified wood, and natural fibers
• Why repairability and end-of-life should be considered when specifying furniture
• Why vague terms like “eco,” “green,” and “conscious” aren't enough
• Why transparency matters and what questions designers should be asking manufacturers
• Where designers should focus first when creating healthier homes: furniture, walls, and floors
• Why sustainable design doesn't have to be perfect—and why better choices add up over time
• Christine’s vision for the future of the furniture industry and product transparency

Connect with Christine Sintermann:

Freebie: Natural Home Guide

Website: https://biosofa.com/

Instagram: @the_biosofa

Reference to video (Natural vs. Synthetic fibres on fire): https://www.youtube.com/watch?v=87hAnxuh1g8

Connect & continue the conversation:

I am creating resources and trainings for interior designers who want to learn more about sustainability and I need your input! I would be so grateful if you would take a few minutes to give me your feedback here: Survey

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