Exterior Wall Insulation R Values

Add r5 insulative wall sheathing beneath the new siding.

Exterior wall insulation r values.

The higher the r value the greater the insulation performance. Add r5 to r6 insulative wall sheathing beneath the new. When determining how much insulation you need don t guesstimate calculate. Whenever exterior siding is removed on an uninsulated wood frame wall.

R value measures how well certain building insulation materials can resist heat. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. 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 your attic to reach r 30 if you live in zones 2 or 3. Wall insulation whenever exterior siding is removed on an.

While rated differently these two types of insulation are close enough in thickness that they can both fit into modern two by four wall systems. While wall insulation is limited by the width of the studs different materials provide higher or lower r values. For example a wall with 3 fiberglass batting r value of 10 8 11 9 may have an overall r value of nearly 14 because of siding sheathing and drywall. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

In calculating the r value of a multi layered installation the r values of the individual layers are added. Know exactly how much you need with our project calculators. Wall cavity and duct distribution system insulation shall be installed in a manner that permits inspection of the manufacturer s r value identification mark. Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and.

See the department of energy s doe ranges for recommended levels of insulation below. Fiberglass batts for standard 2 4 walls are now available in low medium and high density products that range from r 11 to r 15. R value the greater the insulating effectiveness. 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.

In most wall applications you will use r 13 or r 15 kraft faced fiberglass insulation rolls for these two by four stud walls. Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and. Add r5 insulative wall sheathing beneath the new siding. 6102 4 1 protection of exposed foundation insulation.

Insulation applied to the exterior of foundation wa lls and around th e perimete r of slab on grade floors shall have a rigid.