We have begun to fill in the many seams and gaps in the tiny house with low expanding spray foam. The goal is to seal the place up to prevent drafts and the like.
This is an area where we have not really been able to find a good natural alternative. The closest we’ve come is utilizing an expanding latex made by DAP, though it has left some things to be desired. Another product that we’re utilizing is labeled as ‘eco’ but it seems to be your typical run-of-the-mill polyurethane foam… Perhaps they are playing on the fact that by sealing up your home, you are increasing its energy efficiency?
While we may not be using an all natural product, we will have a very energy efficient place once its all sealed up!