Insulating Flat Roof Void

Ventilation is necessary to allow moisture accumulated inside to escape.

Insulating flat roof void.

The material that works best depends largely upon preference in a given situation. Use rigid foam insulation panels on your flat roof before applying the final roof covering or inside the house before adding sheetrock or paneling. Both these variants require different approaches to insulation which will be covered in this guide. Insulation is placed in between the joists underneath the roof surface above.

The supports will rot if they are made of wood or rust if they are of reinforced concrete. Rigid foam panels are available in thickness. Insulation material is placed on top of the roof rather than in between the ceiling and the decking. There is severe rot and mold growing in the sheathing.

Frost will accelerate the damage. As a result if you open up most flat roofs especially those located in places like arizona you will see a lot of moisture rot and mold as a result. Like other roofs insulating a flat one requires ample ventilation a vapor barrier and sealed bypasses. This problem also occurs in roofs that have fiberglass batt insulation and no venting.

The insulation will quickly become saturated with water and cease to be effective. How to insulate a flat roof. It also lets hot air escape in the summer. Proper ventilation in flat roofs.

Sometimes inspectors find that it is completely wet.