 This study tests the thermal insulation qualities of loose agave and wheat straw fibers and three new hybrid specimens made with corn starch as a binder, finding that the hybrid specimens have better thermal conductivity than the loose fibers. The wheat straw fibers have an average outer diameter between 1.28 and 1.98 millimeters and an average diameter of bound porous tubes within the straw in the range 34.5 to 75.6 micrometers, with stretching wave numbers indicating different chemical functional groups. The wheat straw fiber loses less than 3 percent of its mass at temperatures as high as 184 degree Celsius and has an endothermic transition that starts at 342 degree Celsius with a peak value at 749 degree Celsius. Three-point bending moment tests show an increase in both flexural stress and flexural modulus of the hybrid specimens, making them suitable for use as insulation materials in buildings. This article was authored by Mohamed Ali, Abdullah al-Abdukiram, Abdullah Nuhayt, and others. We are article.tv, links in the description below.