Recycled and Renewable Content
It can be hard to find underlay with large amounts of recycled content, but CoraZorb Green is a widely applicable option. The material is 92 percent recycled rubber. It is designed for use with a thin-set mortar under tile, but can also be used under hardwood and floating wood floors. It is moisture resistant and designed for easy installation. The next best thing is a renewable virgin material, and a few options are available.
- Cork underlay certainly fits the bill. Cork is a rapidly renewable bark, and stripping the bark is considered beneficial for the tree, extending its lifespan. Consider putting a soft cork underlay under a solid cork floor.
- Likewise, try wood under wood. Redupax is designed for use under floating laminate and engineered wood floors. It is primarily compressed wood certified by the Forest Stewardship Council. Note that the manufacturer does not promote Redupax as VOC- or formaldehyde-free.
- Another option for floating-floor underlay is a 100-percent sheep wool covering. Remember, though, that wool is a common allergen.
- SoundStop Underlayment is mostly made from wood and sugarcane fibers sustainable sourced close to the manufacturing facility, and glued together with a formaldehyde-free vegetable starch binder.