Moisture Control | Roof Decks | Rigid Insulation | Roof Membranes

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Rigid Board Insulation

Rigid board roof insulation provides both the insulation for a building as well as the substrate to which the roof system membrane reinforcing sheets are attached. Rigid insulation must be compatible with, and provide adequate support for the roof system membrane in addition to the other associated roof assembly components. The rigid insulation shall also accommodate limited roof traffic for such tasks as roof system installations, inspections, and maintenance.

Acceptable Rigid Board Insulation shall have the following Characteristics
1. Ability to withstand hot asphalt application temperatures when specified.
2. Ability to withstand ambient asphalt mineral spirits when specified.
3. Compatibility with the roof deck and the roof system membrane.
4. High compressive strength, rigidity, density, and impact resistance.
5. Combustibility classifications that comply with local building codes.
6. Materials that resist deterioration, and inhibit degradation of adjacent components.
7. Moisture resistance and dimensional stability under varying temperature and humidity conditions.
8. A low K-value and the highest possible R-value with the thinnest dimensions.
9. A K-value that remains constant and doesn’t drift higher with age, causing R-value to drop.
10. A surface that accommodates secure attachment to the substrate.
11. Peel strength that provides sufficient adhesion for the roof system to comply with wind uplift requirements.
12. Consistency of manufactured dimensions including square and true edges.

Types of Rigid Insulation Allowed for Fields Roof Systems
1. Cellular glass 5. Perlite
2. Composite board 6. Polyisocyanurate foam
3. Fiberglass 7. Wood fiberboard
4. Mineral fiber

Criteria to be Specified for Rigid Insulation
The designer shall first calculate the required R-value for the building, then specify:
1. Type of insulation 4. R-value per inch of thickness
2. Thickness of insulation 5. Density of insulation
3. C-value of insulation 6. K-value
Plastic foam insulations, such as polyisocyanurate shall have a cover board installed over them so as to minimize potential moisture entrapment, off-gassing, blistering, and so as to serve as a suitable substrate to which to adhere the membrane reinforcing sheets. Acceptable rigid cover boards for plastic foam insulations include wood fiberboard, perlite, and fiberglass insulation.

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