Odd request time:

I need a small quantity of dense, thick foam insulation board that I believe is called 'Phenolic Foam Board', like this stuff that is used as insulation in cavity wall construction.

I need it to make a prototype model of something I am working on, so I only need one board at most.

Today I went to one big builder warehouse, but they only had three-inch-thick styrofoam, which isn't up the task I have in mind. I'm wondering if in this hot climate, there is simply no demand for the dense Phenolic material.

I'd be delighted if someone could point me to a source somewhere in or near Chiang Mai.

Thanks in advance.

pj

I saw stacks of the dense blue insulation at Home Mall. This looked like the same panels we used in the USA (we called "blue foam") It can be used above or below ground.