Considering that the son just turned 1 year old and the guest apartment in the garage will be his little hideaway, one naturally becomes a bit more concerned about health-hazardous substances in the building material. Formaldehyde is just one of many strange things today's chipboard or OSB panels can contain.
What is preferable? OSB+gypsum, Chipboard+gypsum, or gypsum+gypsum???
A bit lost :S
Hobbit