Insulation materials run the gamut from bulky fiber materials such as fiberglass, rockwool and slag wool, cellulose, and natural fibers to rigid foam boards to sleek foils. Bulky Insulation materials resist heat flow in building cavities. Rigid foam boards trap air or another gas to resist heat flow. Highly reflective foils in radiant barriers and reflective insulation systems reflect radiant heat away from living spaces, making them particularly useful in cooling climates. Other less common materials such as cementitious and phenolic foams and vermiculite and perlite are also available at Insulation Materials Kenya®