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.

Or square feet degrees fahrenheit hour btu. Because the system is spray applied and adheres directly to the roof surface no fasteners are required. 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. Air film interior wall 14.

The higher the r value the greater the effectiveness of the insulation. Pitch angle of roof the pitch of the roof angle can be a considerable factor when replacing your roof. 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.

Built up roof membrane gravel surfaced membrane and gravel only 0 33. 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. When determining how much insulation you need don t guesstimate calculate.

5 0 per inch eps 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. 3 85 per inch polyiso. National roofing contractors association.

Here s a useful r value calculator for roofs. Other materials can be reflective including restoration coatings and most single ply systems but this is not the same as being a good insulator. R value measures how well certain building insulation materials can resist heat. The r value depends on the type of material its thickness and its density.

The average r value for some common roof materials include. Material thickness r value m2k w permeability 50pa notes. Air film interior ceiling 14. Know exactly how much you need with our project calculators.

6 6 per inch xps insulation. Or area temperature difference time heat loss. 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. Without a doubt sprayed polyurethane foam will provide the highest r value and best insulation for your flat roof replacement.