Patent ID: 8007886

Claim:
An underlayment roll good for on-site application between wall, ceiling, and floor construction components, comprising: a flexible underlayment comprising a mat of glass fibers that is saturated with a phase change material, the phase change material being disposed about the exterior of the individual glass fibers and being configured to undergo a solid to liquid phase change between about 15° C. (about 60° F.) and about 27° C. (about 80° F.) to provide for a latent storage of thermal energy, wherein the fibrous mat is completely surrounded by and encased within a flexible polymeric film envelope that is impermeable to the phase change material in liquid form, the underlayment being configured to form a layered construction component/underlayment assembly with the underlayment located between the first and second construction components; the underlayment having a length, a width, and a thickness; the underlayment having first and second major surfaces that are each defined by the length and the width of the underlayment; the width of the underlayment being between about 1.5 feet and about 10 feet; the thickness of the underlayment being between about 0.015 inches and about 1 inch, wherein, the fiber density of the mat, the viscosity of the phase change material, the enclosure of the mat and phase change material within the flexible polymeric film envelope limit the migration of the phase change material within the flexible polymeric film envelope; and the underlayment being in roll form.