WITH OX-IS, YOU AFFORDABLY
ACHIEVE AN R-20 2X4 WALL.

Across the U.S., jurisdictions are increasingly requiring R-20 insulation for above-grade wood-framed walls to meet code. OX-IS® weatherization system, used in combination with standard R-13 fiberglass batt insulation in the stud cavity, affordably meets this requirement, without having to abandon traditional 2x4 wood-framed construction.

SHOW ME THE NUMBERS

IECC 2021 CALLS FOR R-20 WALLS THROUGHOUT MOST OF THE U.S.

Many states and jurisdictions refer to the International Energy Conservation Code (IECC) when establishing residential construction energy codes. With its 2021 version, the IECC calls for a U-0.045 (R-20 with a prescriptive approach) for above-grade wood-framed walls for most of the U.S. In addition to California, with its rigorous Title 24 energy efficiency standards, several other states and jurisdictions have already adopted this requirement, and with skyrocketing energy costs, it’s likely we’ll soon see others do the same.

THE OX-IS SOLUTION:
AFFORDABLE INITIAL COST.
A LIFETIME OF ENERGY SAVINGS.

Fortunately, OX-IS provides builders and homeowners with an outstanding solution. As a cost-saving 4-in-1 weatherization system, OX-IS includes robust polyisocyanurate continuous insulation – up to R-10 – solving stringent energy code mandates, while reducing energy costs for years to come. No matter where you’re building or how stringent an energy code, you’ll find that OX-IS matches the code’s prescription perfectly.

THE IECC CLIMATE ZONE MAP

2021 IECC RESIDENTIAL PROVISIONS

INSULATIVE REQUIREMENTS AND PRESCRIPTIVE COMPLIANCE OPTIONS
FOR ABOVE-GRADE 2X4 WOOD-FRAMED WALLS

SOLUTION

OX-IS 1.70” R-10

R-13 CAVITY INSULATION +
OX-IS 1.00” R-6

R-13 CAVITY INSULATION +
OX-IS 1.70” R-10

CLIMATE ZONE


REQUIRED ASSEMBLY
U-FACTOR

0.084

0.060

0.045

PRESCRIPTIVE
MINIMUM R-VALUE*

0 + 10 ci

13 + 5 ci

13 + 10 ci


SOLUTION

OX-IS 1.70” R-10

CLIMATE ZONE

REQUIRED ASSEMBLY
U-FACTOR

0.084

PRESCRIPTIVE
MINIMUM R-VALUE*

0 + 10 ci


SOLUTION

R-13 CAVITY INSULATION +
OX-IS 1.00” R-6

CLIMATE ZONE

REQUIRED ASSEMBLY
U-FACTOR

0.060

PRESCRIPTIVE
MINIMUM R-VALUE*

13 + 5 ci


SOLUTION

R-13 CAVITY INSULATION +
OX-IS 1.70” R-10

CLIMATE ZONE

REQUIRED ASSEMBLY
U-FACTOR

0.045

PRESCRIPTIVE
MINIMUM R-VALUE*

13 + 10 ci

ci = continuous insulation such as OX-IS weatherization system

* The first value is cavity insulation. The second value is continuous insulation (ci). Therefore, “13 + 10 ci” means R-13 cavity insulation plus R-10 continuous insulation (ci).

Data in the chart shown above has been gleaned from 2021 International Energy Conservation Code (IECC), Chapter 4 Residential Energy Efficiency, Table R402.1.2 Maximum Assembly U-Factors and Fenestration Requirements and Table R402.1.3 Insulation Minimum R-Values and Fenestration Requirements by Component.