R Values Of Roofing Materials

R value per inch ft f hr btu rsi per millimeter k m w r value for typical installed thickness not per inch source.

R values of roofing materials.

Air film interior wall 14. Pitch angle of roof the pitch of the roof angle can be a considerable factor when replacing your roof. 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. 5 0 per inch eps insulation.

R value measures how well certain building insulation materials can resist heat. 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. Because the system is spray applied and adheres directly to the roof surface no fasteners are required. When determining how much insulation you need don t guesstimate calculate.

The average r value for some common roof materials include. Material thickness r value m2k w permeability 50pa notes. Air film interior ceiling 14. 6 6 per inch xps insulation.

Without a doubt sprayed polyurethane foam will provide the highest r value and best insulation for your flat roof replacement. Other materials can be reflective including restoration coatings and most single ply systems but this is not the same as being a good insulator. National roofing contractors association. The r value depends on the type of material its thickness and its density.

Here s a useful r value calculator for roofs. Built up roof membrane gravel surfaced membrane and gravel only 0 33. 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.

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. 10mm 13mm 07 077. Or square feet degrees fahrenheit hour btu. In construction the r value is the measurement of a material s capacity to resist heat flowfrom one side to the other.

The higher the r value the greater the insulation performance. Know exactly how much you need with our project calculators. The higher the r value the greater the effectiveness of the insulation. 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.