R Value Of Roofing Materials

The higher the r value the more insulation the material provides by limiting airflow between outside and inside the building.

R value of roofing materials. The r value of a material is its resistance to heat flow through the material. Eps based claddings directly fixed on timber framing. In this guide we ll cover the following most common roofing options. 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.

Asphalt shingles wood shingles and shakes metal roofing concrete clay and fiber cement tiles natural and. In general higher r means more resistance to heat loss and therefore lower heating or cooling bills for the building. In construction the r value is the measurement of a material s capacity to resist heat flowfrom one side to the other. R value of building materials material r inch r thick ness fiberglass inch 3 00 1 inch 4 00 inch 6 00 extruded polystyrene inch 3 75 1 inch 5 00 1 inch 7 50 foil faced polyisocyanurate inch 5 40 1 inch 7 20 1 inch 10 80 siding materials hardboard inch 0 34.

The higher the r value the greater the insulation performance. Rsi r value système international is the metric equivalent. R values and heat loss. Types of roof insulation.

It s important to think about r value when considering your roof project because by increasing the r value you allow your roof to keep warm air in during the winter and out during summer. The following table is in metric form. This webpage calculates the r value of walls roofs and suspended floors for most insulation material r values. This comprehensive guide to roofing materials is all the research you ll need to evaluate the top choices for residential re roofing and new construction projects in 2020 what to expect.

To convert rsi to r value multiply the rsi by 5 67826. In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. R value is used as a measurement of the effectiveness of thermal insulating materials.

For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. R value measures how well certain building insulation materials can resist heat. When determining how much insulation you need don t guesstimate calculate. Some of the possible material combinations may not be suitable for actual constructions i e.

R value table for roofing materials and building insulation. When buying various insulation materials you will almost always see an r value quoted for the material. The higher the r value the better a material performs as a thermal insulator. Know exactly how much you need with our project calculators.