Half Inch Siding Insalation R Value

While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country.

Half inch siding insalation r value.

Expanding polystryrene which is also called beadboard is a closed cell insulating board with an r value of 3 8 to 4 4 per inch. Logs of around 6 inches would then have an r value that is about 8. 2 in x 4 ft x 8 ft 1 faced polystyrene garage door foam board insulation item 15357 model 2x48x96 r tech. Also called styrofoam insulation this is the least expensive material.

R tech ff fanfold is a high performance sheathing consisting of a superior closed cell lightweight and resilient expanded polystyrene eps with advanced polymeric laminate facers. Products with a higher r value have a higher cost but have an increased capacity to resist heat flow and therefore provide greater insulation. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. Notes to the table above.

As a benchmark one inch of solid wood has an r value of 1. Notes on the r value k values of different forms of asbestos. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. Rosato asbestos insulation is the most authoritative source on asbestos properties and gives data for the thermal conductivity of asbestos in different forms and with varying temperatures for magnesia asbestos insulation at mean temperatures ranging from 100 f to 400 f the k value thermal.

Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Per inch r value of softwood is 1 41. In hardwood it is 0 71.

This product typically has an r value of 3 6 to 4 0 per inch of thickness. Polyisocyanurate has an r 7 value per inch. Extruded polystryrene has a higher r 5 per inch is stronger and highly resistance to moisture infiltration. It is so low that it is below many industry standards.

Each type comes with unique advantages. This value when compared to other insulating materials is actually pretty low. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. It provides r values that range from 3 6 to 4 2 per inch.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.