How Does Fiberglass Roof Insulation Work

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.

How does fiberglass roof insulation work.

Fiberglass is a composite material made of a plastic matrix reinforced by tiny glass fibers. 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. If fiberglass isn t fitted in properly it can leave gaps for airflow.

How fiberglass insulation works. How does insulation work to prevent heat loss. 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. The versatility of fiberglass insulation today allows for easy completion of any project it comes by the roll or in pre cut batts in a variety of thicknesses and widths to fit any r value the rating of the insulating capability of the insulation specs.

Never fear standard insulating will install the new insulation for you. Fiberglass insulation is not very efficient against moisture. It is lightweight yet strong and since glass isn t a good conductor of heat it s a very effective insulation material. 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.