Need help choosing insulation material

[abq]

I have an older home partially constructed with cement block (hollow core blocks). The outside walls have no insulation either on the inside or on the outside under the stucco.

I just recently bought the home and the seller had a new stucco coat put on the outside without adding solid foam insulation first. A cheap and quick job for a quick sell.

So I would like to insulate the inside of the exterior cement block walls by using rigid foam insulation sheets and then cover that with sheetrock/wallboard.

I remember many years ago that it was unsafe to use rigid foam inside a house because a fire would create a toxic gas when the flame reached the foam.

So the question is this: Is there any safe rigid foam insulation for interior use? Brand name? Chemical name?

I live in Albuquerque, New Mexico, USA.

Thanks for the help.

[gleearch]

http://www.aiacolorado.org/SDRG/div07/index.html

[abq]

Thanks for the link. I will study it. Any further replies to my question are still welcome.

Frank