All Sun Stream Saunas are built entirely from 100% FSC Certified premium grade Canadian Hemlock. Many brands will use a less expensive soft wood timber for the internal frame. It is also common practice with many sauna brands to use plywood and particleboard hidden in the floor, ceiling, roof and elsewhere in the sauna, these are highly suspect for emitting formaldehyde when heated.
Our saunas are 100% Canadian Hemlock for the entire sauna, logged milled and kiln dried in BC Canada.