How Does Fiberglass Roof Insulation Work

How fiberglass insulation works.

How does fiberglass roof insulation work.

How does insulation work to prevent heat loss. And the best part is an insulation project often leads to a significant reduction in the heating and cooling bills paying you back for. Persistent roof leaks increase moisture in attics which contaminates fiberglass batt insulation. It is lightweight yet strong and since glass isn t a good conductor of heat it s a very effective insulation material.

While any type of insulation will work for roofs some prefer foam because it usually manages air flow better and the r values are higher. During the summer it would seem like a good idea to also insulate the underside of the roof in an effort to keep the attic cooler but the roof rafters are limited in being able to hold either r13 or r19 rolled fiberglass which is not enough to entirely block the heat from coming into the attic. Fiberglass is a composite material made of a plastic matrix reinforced by tiny glass fibers. If fiberglass isn t fitted in properly it can leave gaps for airflow.

Fiberglass insulation is not very efficient against moisture. Wet fiberglass insulation has no r value until it dries out unlike foam board or sprayed foam insulation which keeps its insulation properties even when wet. By the afternoon the attic will get quite warm hot and then the insulation installed on the roof rafters will serve to hold that heat in over night and the attic insulation on your ceiling won t. Fiberglass roof insulation works like a blanket spread over your house keeping thermal energy out during the summer and keeping the heat in during the winter.