Anyone know if there are companies in Nakhon Sawan or Kamphaeng Phet, or in that general area, that spray foam on the underside of metal roofs (PU?). And is there one that does blown insulation over the gypsum ceiling?

Go a metal roof sheet supplier and ask them.

Sprayfoam Thailand has website in English.

The sprayfoam is a great idea for my Thai-style cottage/office. The problem is that we live out in the boonies and don't have the minimum of 300 sq. meters of roof the company requires for upcountry projects.

Edited August 27, 20178 yr by missoura

Could you also sign up a couple of neighbors?

Actually, that is what the company recommends. But in my area, the neighbors are not big believers in insulation. They say it costs to much. I gave up explaining the benefits a long time ago.