Ceiling Batt Insulation R Value

High density cathedral ceiling batts allow an airspace between the insulation and roof deck for ventilation.

Ceiling batt insulation r value.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Rockwool safe n sound r 59 7 sq ft unfaced stone wool batt insulation 15 25 in w x 47 in l. U factor is a measure of a component assembly in its conductive and radiate capacities. High density sidewall batts are available in sizes to fit standard construction without loss of r value due to compression.

Effective r values for batt insulation derived from ashrae document heat transmission coefficients for walls roofs ceilings and floors 1996 good fair poor measured batt thickness inches effective r value 2 5 per inch effective r value 1 8 per inch effective r value 0 7 per inch. Let me explain when the general public hears an r 13 wall insulation they believe that in fact they have an r 13 insulation value in their exterior walls. R value actually stands for resistive value. See the department of energy s doe ranges for recommended levels of insulation below.

The truth is this studs have an r value of 3 5. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. These batts meet the energy saving requirements of today s codes without requiring changes in construction. 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.

Rockwool comfortbatt r 23 39 8 sq ft unfaced stone wool batt insulation 15 25 in w x 47 in l 469 owens corning ecotouch r 30 31 25 sq ft unfaced fiberglass roll insulation 15 in w x 25 ft l. Item 305816 model rxss31525. This means for example that pink batts ultra r4 0 insulation is more effective than pink batts classic r1 8 insulation. 10 bags model bf42 view the owens corning 2x6 wall floor insulation.

Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Add insulation to attic. Existing 3 4 inches of insulation. The higher the r value the better the insulation is at reducing heat flow.