R Values Of Roofing Materials

The higher the r value the greater the effectiveness of the insulation.

R values of roofing materials.

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. Or square feet degrees fahrenheit hour btu. 5 0 per inch eps insulation. Because the system is spray applied and adheres directly to the roof surface no fasteners are required.

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. 6 6 per inch xps insulation. 10mm 13mm 07 077.

The average r value for some common roof materials include. The r value depends on the type of material its thickness and its density. Know exactly how much you need with our project calculators. Material thickness r value m2k w permeability 50pa notes.

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. 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. R value of roofing materials and building insulation.

Other materials can be reflective including restoration coatings and most single ply systems but this is not the same as being a good insulator. In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation. 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. Here s a useful r value calculator for roofs.

Without a doubt sprayed polyurethane foam will provide the highest r value and best insulation for your flat roof replacement. When determining how much insulation you need don t guesstimate calculate. Pitch angle of roof the pitch of the roof angle can be a considerable factor when replacing your roof. R value measures how well certain building insulation materials can resist heat.

Or area temperature difference time heat loss. In construction the r value is the measurement of a material s capacity to resist heat flowfrom one side to the other. Air film interior ceiling 14. National roofing contractors association.