How can formaldehyde move through a solid surface?
Formaldehyde moves through a building in the same way as water vapour. Most people are familiar with the fact that moisture can move easily between walls. This is because many solid materials used in building are porous. This may not be visible to the naked eye but at a molecular level many gases can move through solid surfaces. Formaldehyde can also be generated from materials within wall, floor or ceiling cavities and move outward into living spaces.
