R Values Of Roofing Materials

Because the system is spray applied and adheres directly to the roof surface no fasteners are required.

R values of roofing materials.

3 85 per inch polyiso. An insulating material s resistance to conductive heat flow is measured or rated in terms of its thermal resistance or r value defined as ft f hr btu. The higher the r value the greater the insulation performance. 6 6 per inch xps insulation.

When determining how much insulation you need don t guesstimate calculate. R value of roofing materials and building insulation. Know exactly how much you need with our project calculators. In construction the r value is the measurement of a material s capacity to resist heat flowfrom one side to the other.

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. Other materials can be reflective including restoration coatings and most single ply systems but this is not the same as being a good insulator. Pitch angle of roof the pitch of the roof angle can be a considerable factor when replacing your roof. Built up roof membrane gravel surfaced membrane and gravel only 0 33.

R value per inch ft f hr btu rsi per millimeter k m w r value for typical installed thickness not per inch source. Air film interior wall 14. R value measures how well certain building insulation materials can resist heat. Material thickness r value m2k w permeability 50pa notes.

Air film interior ceiling 14. 5 0 per inch eps insulation. 10mm 13mm 07 077. Asphalt shingles have an r value of around 45 while wooden shakes or shingles carry an r value of 97 or more than double its competitor.

National roofing contractors association. In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation. The material offers the highest r value on the market and has no fasteners in the surface to allow thermal bridging. Or square feet degrees fahrenheit hour btu.

The higher the r value the greater the effectiveness of the insulation. The average r value for some common roof materials include. The r value depends on the type of material its thickness and its density. Here s a useful r value calculator for roofs.