Icynene. MD-R-200 medium-density spray-foam insulation uses 100% water-blown technology. The insulation provides an R-value of 5.2 per inch and offers a low vapor permeance for use in areas with higher levels of humidity; according to the company, it also is ideal for projects requiring the enhanced structural strength of a more rigid foam. 800.758.7325. www.icynene.com.