Fiberboard Roof Insulation R Value

For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15.

Fiberboard roof insulation r value.

In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation. 3 rsi is the metric expression of r value m 2 k w. To minimize the effects of thermal bridging atlas strongly recommends the use of multiple layers when the total desired or specified r value requires an insulation thickness greater than 2 7 thick. High r value 2 5 r.

Protector hd allows easy efficient scoring cutting and snapping which permits fast tight fabrication and all in a low dust environment. Huebert fiberboard roof insulation must be dry when it is used on a roof. For a very good introductory overview article on r value see r values over at the website of. R value of various materials.

30 divide this per inch numberby 2 to obtain the r value for 1 2 medium density fiberboard r 1 22. Huebert fiberboard roof insulation makes a good substrate insulation in re roof situations providing the existing roofing or insulation is clear of debris fairly level and moisture free. It has only 1 r value per inch and is always installed in 0 5 inch thickness. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.

Included is our r value guide detailing the suggested amount of insulation dependent upon zone as provided by the u s. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Also included is the hugely helpful insulation zip code calculator that spells out the suggested amount of r value necessary for the different portions of a structure like foundation interior and. Fiberboard is not an insulation.

For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. C factor 1 2. To convert rsi to r value multiply the rsi by 5 67826. Provides significantly more thermal insulation r value than wood fiber or gypsum boards.

Moisture will be trapped inside causing mold growth and further reducing its efficiency. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Rsi r value système international is the metric equivalent. Fiberboard insulating sheathing regular density per inch.

Additionally attic condensation and leaks will make fiberboard wet. Therefore you get practically 0 r value out of it. R value is used in the united states. This also means easy hoisting staging and maneuvering around the roof.