# Presentation: 516755

## Commercial Energy Code Compliance

**Commercial Energy Code Compliance**
**IECC 2000/****2001/2003**
_**Envelope Requirements**_
**Chapter 8 IECC**

- U.S. Department of Energy Building Energy Codes Program

## Overview of Code ComplianceStructure of the IECC

**Overview of Code Compliance****Structure of the IECC**

- Chapter 1	Administrative & Enforcement
- Chapter 2	Definitions
- Chapter 3	Design Conditions
- Chapter 4	Residential - Systems Analysis
- Chapter 5	Residential - Component Performance
- Chapter 6	Simplified Prescriptive Requirements
- Chapter 7	ASHRAE 90.1 Energy Code Reference
- Chapter 8	Design by Acceptable Practice for Commercial Buildings
- Chapter 9	Referenced Standards

- Commercial
- Chapters

**Chapter 8 covered in this presentation****.**

**Notes:**
Chapter 7 reference to ASHRAE 90.1 depends on the IECC issue
2000 IECC references 90.1-89
2001 IECC references 90.1-99
2003 IECC references 90.1-2001

## Commercial Compliance Outline

**Commercial Compliance Outline**

- Overview of Commercial Energy Codes
- Code Requirements
- Building Envelope
- Mandatory Requirements
- Prescriptive Requirements
- Mechanical Systems
- Simple Systems
- Complex Systems
- Service Water Heating
- Lighting Systems

**For additional training materials see  **_[www.energycodes.gov/training/presentations/](http://www.energycodes.gov/training/presentations/)_

**2000/200/2003 IECC Chapter 8 **_**Envelope Requirements**_** covered in this presentation.  Requirements for Chapter 7 (ASHRAE 90.1) are covered in a **_**separate**_** presentation**.

## Application

- When does the IECC apply?
- Newly conditioned space
- New construction in existing buildings
- Alterations to existing spaces
- Additions
- Mixed use buildings
- Change in occupancy

**Notes:**
 In general, the IECC applies to new construction i.e. new buildings and also new construction in existing buildings that create conditioned space.  More detail will be given for each of the applications in the next few slides.

## Exceptions

-   Very low energy use buildings
-     (<3.4 Btu/h-ft2  or 1 watt/ft2) *for all purposes*
-   Buildings (or portions) not heated _or_ cooled
-   Buildings designated as historic

**Notes:**
Regardless of this exempt status, lighting 
and  service water heating shall meet the
applicable provisions.....

## Newly Conditioned Space (Previously Unconditioned)

- Envelope, mechanical and lighting systems must be brought into compliance
- Potential problem areas
- Building envelope
- Lighting system
- Recommendations
- Demonstrate compliance for systems at the time of permit

**Notes:**
Many code enforcement jurisdictions require that building owners sign an affidavit when applying for the initial building permit for a shell building.  The owner acknowledges in the affidavit the potential difficulties associated with postponing envelope and lighting compliance.  To minimize these difficulties, permit applicants should demonstrate compliance when each system is installed.

Examples include adding a conditioned office area to an existing unconditioned warehouse.  The building envelope would need to be brought into compliance.  This could be done by
  adding insulation
  decreasing or changing out the windows
  reducing the lighting levels if to lighting levels did not meet code

## New Construction in Existing Buildings (Tenant Improvements)

- New system(s) must comply
- Envelope (should already comply)
- Mechanical
- Lighting

**Notes:**
Tenant improvements in an existing building (the base building has been constructed, but the individual tenant spaces have not been completed) are considered new construction.  All envelope, lighting, and mechanical systems and components being installed must comply with some or all of the IECC requirements.
Existing systems and components not subject to the current permit application must comply with the IECC requirements when conditioning previously unconditioned spaces.
A tenant improvement space in a strip shopping center is a common example.  Typically, the tenant is required to comply with the mechanical requirements of the energy code and with the lighting requirements of the energy code.

## Additions

- Construction of new conditioned space or the conditioning of previously unconditioned space
- Treat the envelope, lighting, and mechanical systems as if the addition were a new building

- Compliance options for additions
- Treat as a stand-alone building
- Bring entire building into compliance

**Notes:**
Additions are newly constructed conditioned spaces or previously unconditioned spaces after heating or cooling equipment has been installed.  All additions must comply with the IECC requirements.
Envelope, lighting, and mechanical systems and components are treated the same as they are for new buildings.  Existing systems simply extended into an addition do not have to be brought up to IECC efficiency levels.

Additions can be combined with the existing buildings to show compliance with the code.

## Change in Occupancy

- No action is required if alterations are not made to the building systems

**Mel’s Diner**

**Kurt’s Five & Dime**

**Notes:**
The IECC requirements generally do not apply to occupancy changes.  However, if physical changes are made to the building, the rules for alterations or additions may apply.  Your code enforcement official will need to evaluate these changes on a case-by-case basis to determine energy requirements.

## Change In Occupancy

- Alterations to Existing Spaces
- Applies to only portions of the systems being altered
- Applies if alteration increases energy use
- Alterations must meet the requirements applying to the altered component
- New systems in the alterations must comply

**Notes:**
Alterations to the energy using systems may result due to a change of occupancy.  For example, more lighting might be required for a retail store that is moving into an existing office space, resulting in an increased lighting load on the space.
In most cases, existing envelope, lighting, and mechanical systems and components set the requirements for alterations.  For example, envelope alterations comply if the overall performance of the envelope is not degraded.  Similarly, lighting alterations comply if the building’s overall connected lighting load does not increase.  Mechanical alterations are governed primarily by the requirements for each altered component.

## Mixed Use Buildings (Section 101.4.3)

- Minor occupancy
- <10% of floor area
- Treat as major occupancy
- Different commercial occupancies
- Treat building under the same compliance process as single occupancy building

- Clothing Store

- Office

- Barber Shop

- Bakery

- Shoe Store

**Notes:**
The IECC uses the same compliance process for commercial buildings with multiple-occupancy types as for those with a single-occupancy type.

Minor occupancy rules allow a 1000 ft2  office to be combined with a 10,000 ft2 retail store under the prescriptive lighting whole building approach.

## Mixed Use Buildings (cont’d)

- Hotel/motel and commercial occupancies
- Treat as Different Commercial Occupancies
- Mixed residential and commercial occupancies       if _< _3 stories
- Treat the residential occupancy under the applicable residential code
- Treat the commercial occupancy under the commercial code
- If > 4 stories
**Treat all as commercial under the commercial code**

- Restaurant

- Apartments

**Notes:**
Mixed residential and commercial occurs when a building has three or fewer stories and contains both residential and commercial occupants, with the minor occupancy type taking up more than 10 percent of the building’s conditioned floor area.

The residential and commercial occupancies fall under two different scopes.  Thus, two compliance submittals must be prepared using the appropriate calculations and forms from the respective codes for each.

Buildings > 4 stories are considered commercial buildings

## IECC Chapters 7 and 8

| Commercial Building Compliance Options | Scope | Building Envelope Requirements | Building Mechanical Systems | Service Water Heating Systems | Building Lighting Systems | Total Building Performance |
| --- | --- | --- | --- | --- | --- | --- |
| Chapter 7
ASHRAE 90.1 1999
Energy Standards for Buildings Except Low-Rise Residential Buildings | Section 2 | Section 5
 | Section 6
(Simple Approach
If Bldg < 25,000 s.f.)
 | Section 7
 | Section 9
 | Section 10
 |
| Chapter 8
Design by Acceptable Practice for Commercial Buildings
 | Section 801 | Section 802
(less than 50% glazing only) | Section 803 | Section 804 | Section 805 | Section 806 |

**Notes:**
  Chapter 8:  Sections 802, 803, 804, and 805 shall each be satisfied on an individual basis.  Where one or more of these sections is not satisfied, compliance shall be demonstrated in accordance with the provisions of ASHRAE 90.1

Chapter 8  Building Envelope:  Glazing must be less that 50%

## Overview of Code Compliance

| IECC Chapter 7 | ASHRAE 90.1-1989 | ASHRAE 90.1-1999 | ASHRAE 90.1-2001 |
| --- | --- | --- | --- |
| IECC Chapter 8  | 2000 IECC | 2001 IECC | 2003 IECC |
| Building Envelope |  | unchanged | unchanged |
| Mechanical |  | Efficiencies similar to1999  | Efficiencies more similar to 1999 |
| Service Hot Water Heating |  | unchanged | unchanged |
| Lighting |  | Automatic Shut off controls | New LPD, 
Electric metering |

**This presentation covers 2000/2001 IECC Requirements – ****2001/2003requirements are listed in **_**red**_**.**

**Notes:**
BLDG. ENV.   UNCHANGED THROUGH 2003

SERVICE WATER HEATING  UNCHANGED THROUGH 2003

MECHANICAL  2001   efficiency requirements look like 99
                     2003   slightly different more towards 99

LIGHTING
From 2000 to 2001:
Added "automatic lighting shutoff" control requirement for bldgs over 5000 sqft - can be met with whole building shutoff control, occupancy sensors, or similar control.
Added exit sign wattage limit and other minor wording changes and added exceptions

From 2001 to 2003:
Added 10 additional building types to the LPD list.
Revised all whole building and space type LPDs to reflect the aggressive LPD values recently developed by ASHRAE/IESNA.
Added requirement for electric metering of individual living units in high rise multi-family buildings.

## IECC Chapter 8Design by Acceptable Practice 

**IECC Chapter 8****Design by Acceptable Practice**** **

- This presentation covers the Mandatory and Prescriptive requirements, see COM*check*-EZ  materials for information on the Trade-off and Performance Options.
**For additional training materials see  **_[www.energycodes.gov/training/presentations.stm](http://www.energycodes.gov/training/presentations.stm)_

## Presentation Reference

**Presentation Reference**

**2000/****2001/2003**** ****IECC****  **

**Mechanical**

**Lighting**

**Envelope**

**Mandatory Requirements**

**Prescriptive Requirements**

**IECC Chapter Reference (7 or 8)**

**Building System covered by material**

**Type of requirement covered by material**

**Includes section #**

**Section #**

**This presentation covers 2000/2001 IECC Envelope Requirements – ****2001 requirements are listed in **_**red**_**.**

**Code year covered in current presentation.**

## IECC Building Envelope Requirements

**IECC Building Envelope Requirements**

- Mandatory Requirements:
- Moisture Control
- Air Leakage
- Prescriptive Requirements:
- Roof
- Above Grade Walls
- Below Grade Walls
- Floor
- Slab
- Skylights, Windows, and Doors

**Section 8**

**Notes:**
What comprises the bldg. Envelope

Bldg. Envelope separates conditioned space from unconditioned space or outdoor.

Conditioned Space is the area that is being heated and cooled.

## Moisture Control - Vapor Retarder

- Install in non-vented framed ceilings, walls, floors
- Must have a Perm Rating of <1.0
- Install on the “warm-in-winter” side of insulation

**Section 802.1.2**

**Notes:**
Nonvented areas are framed cavities without vents or other openings to allow for free air movement.
Normally the “warm-in-winter” side of the insulation will be the inside of the building.  The vapor retarder will be placed between the insulation and the sheetrock facing the interior of the building.

Typical vapor retarders include the craft facing on fiberglass batt insulation and polyethelene sheet.

## Vapor Retarder (cont’d)

- Exceptions
- Climate Zones 1 through 7 (IECC Chapter 3)
- In construction where moisture or its freezing won’t damage materials
- If other approved means to avoid condensation are provided

- States with _no_ vapor retarder requirements (IECC 2001)

**Section 802.1.2**

**Notes:**
Vapor retarders are not required where moisture or its freezing will not damage materials.

Climate Zones 1 through 7 are exempt from this requirement.  Each state is divided up into a series of climate zones.  The Climate Zone maps are located in Chapter 3 of the IECC.

A description of the climate zones is given on the next slide.

## Air Leakage

- Windows and doors
- Between sole plates
- Floors and exterior wall panels
- Plumbing
- Electrical
- Service access doors or hatches

**Section 802.3**

**Notes:**
There is no specific code language that precisely dictates how a leak should be seal or how to judge the quality of a seal.

There are several places where air leakage can occur:
Exterior joints around window and door frames
Between wall sole plates, floors, and exterior wall panels
Openings for plumbing, electrical, refrigerant and gas lines in exterior walls, floors and roofs
Openings in the attic floor such as where ceiling panels meet interior and exterior walls and masonry fireplaces
Service and access doors or hatches

## Window, Door and Curtain Wall Assemblies 

- Manufactured window and door air leakage rates
- Labeled windows and doors enforced at point of manufacturer
- Meet AAMA/WDMA 101 windows, doors, and curtain wall assemblies
- Doors meet ASTM E283
- Non-labeled windows and doors ~ use manufacturers test results

**Section 802.3...**

**Notes:**
Site built windows must be sealed.  No infiltration rates apply in this application.

## Sealing

- Building envelope
- Sealed with caulking materials or
- Closed with gasketing systems
- Joints and seams sealed or taped or covered with a moisture vapor-permeable wrapping material

**Section 802.3...**

**Notes:**
Sealing materials spanning joints between construction materials shall allow for expansion and contraction of the construction materials.

## Dampers

- Stair, elevator shaft vents and others to have motorized dampers
- Closed unless required by fire and smoke detection systems
- Exception
- Gravity dampers permitted in buildings < 3 stories above grade

***photo courtesy of Brit-Makela Group***

**Section 802.3...**

**Notes:**
2001 IECC NEW requirements

DAMPERS MUST HAVE A MAX LEAKAGE RATE OF 3 CFM/FT2 AT 

## Loading Docks - Cargo Doors

- Weatherseals on cargo doors and loading dock doors

**Section 802.3...**

## Vestibules

- Doors separating conditioned space from exterior to have an enclosed vestibule
- All doors in and out of vestibule to have self-closing devices
- Designed so interior and exterior doors do not have to be open at the same time

***photo courtesy of Brit-Makela Group***

**Section 802.3.5**

## Vestibules (cont’d)

- Exceptions
- Climate zones 1a-4b
- Doors not used as entrance doors
- Doors directly from guest room
-     or dwelling unit
- Doors from a space < 3000 ft2 in area
- Revolving doors
- Doors used primarily for vehicular movement or material handling and adjacent to personnel doors

**Section 802.3...**

## Recessed Lighting Fixtures

- Type IC rated, with no penetrations between the inside of the recessed fixture and ceiling cavity (sealed and caulked)
- Type IC or non-IC rated, installed inside a sealed box of  1⁄2" gypsum wallboard or other assembly manufactured for this purpose
- Type IC rated, in accordance with ASTM E283 to be an “Air-Tight” enclosure

**Section 802.3.6**

**Notes:**
When installed in the building envelope, recessed lighting fixtures shall meet one of these requirements.

IC means “insulated ceiling.”  Another designation label you might encounter is Air-Lok.  

The Type IC or non IC rated installed inside the sealed box while maintaining required clearance of not less the .5 inch from combustible materials and not less than 3 inches from insulation material.

Type IC rated in accordance with ASTME E283 admitting no more than 2.0 cfm of air movement from the conditioned space to the ceiling cavity.

## Building Envelope Prescriptive Requirements

**Building Envelope Prescriptive Requirements**

- Mandatory Requirements:
- Moisture Control
- Air Leakage
- Prescriptive Requirements:
- Roof
- Above Grade Walls
- Below Grade Walls
- Floor
- Slab
- Skylights, Windows, and Doors

**Section 802**

**Notes:**
What comprises the bldg. Envelope

Bldg. Envelope separates conditioned space from unconditioned space or outdoor.

Conditioned Space is the area that is being heated and cooled.

## Building Envelope Requirements

- For buildings  50% glazing to gross wall area
- Minimal calculations
- Based on:
- Climate zone
- Window wall ratio
- Construction assembly
- All components must meet or exceed building envelope requirements

**Section 802**

**Notes:**
The Building Basic Envelope Requirement method is a prescriptive approach that requires all components in your design to meet or exceed prescribed efficiency levels contained in the prescriptive package table for your building’s climate zone.
If one component does not meet the prescribed efficiency level, you must:
  change the building design or 
  use an approach in Chapter 7.
 In addition, the prescriptive packages are restricted to use with buildings 50% of the gross wall area in glazing.  For buildings with more glazing, you must use Chapter 7.

## R-Values

- Thermal resistance to heat flow
- The larger the number the better
- The R-value of layers in a construction can be added together

**Notes:**
R-values are better understood than U-values.  The bigger the number the better.  

## U-Factors

- The amount of heat in Btu (British thermal units) that flows each hour through one square foot, when there is a 1oF temperature difference across the surface
- The smaller the number the better

**Notes:**
An understanding of U-factors is critical to compliance and enforcement of the building envelope requirements.  

## IECC Prescriptive Table

**Section 802**

| WINDOW AND GLAZED DOOR AREA OVER 25 PERCENT BUT NOT GREATER THAN 40 PERCENT OF ABOVE-GRADE WALL AREA |  |  |  |
| --- | --- | --- | --- |
| ELEMENT | CONDITION/VALUE |  |  |
| Skylights (U-Factor) | 0.8 |  |  |
| Slab or Below-Grade Wall (R-Value) | R-8 |  |  |
| Windows and Glass Doors
PF<0.25
0.25 <  PF < 0.50
PF > 0.50 | SHGC |  | U-Factor |
|  | 0.4
0.5
0.6 |  | 0.5
0.5
0.5 |
| Roof Assemblies (R-Value)
All-Wood Joist/truss
Metal joist/truss
Concrete slab or deck
Metal Purlin with thermal block
Metal Purlin without thermal block | Insulation Between Framing |  | Continuous Insulation |
|  | R-30
R-30
NA
X
X |  | R-23
R-24
R-23
R-24
R-24 |
| Floors over outdoor air or unconditioned space (R-Value)
All-wood joist/truss
Metal joist/truss
Concrete slab or deck | Insulation between framing |  | Continuous Insulation |
|  | R-19
R-19
NA |  | R-15
R-16
R-16 |
| Above Grade Walls (R-Value)
Framed
   R-Value Cavity
   R-Value Continuous
CMU, > 8 in, with integral insulation
   R-Value Cavity
   R-value continuous
Other masonry walls
   R-cavity
   R-continuous | No Framing | Metal Framing | Wood Framing |
|  | 
NA
NA

NA
R-5

NA
R-5 | 
R-11
R-0

R-11
R-0

R-11
R-0 | 
R-11
R-0

R-11
R-0

R-11
R-0 |

**Notes:**
Use this table as a reference as you go through the next few viewgraphs.  Describe how the table is structured and divided into three sections based on percent glass to wall area.  Point out any other items about the table.  

## Glazing Area Percentage

- Glazing percentage to Above Grade Wall
- Gross window area / gross wall area
- Gross wall area includes
- Above-grade walls
- Band joist and subfloor between floors
- Area of all doors and windows

**Section 802**

**Notes:**
The gross window area includes the rough-opening area of the window, not just the transparent glass area.  It does not include the area of the skylight.

You must use Chapter 7 to demonstrate compliance for buildings having a window-wall ratio (WWR) of more than 50%.

## Above Grade Walls

- Meet or exceed R-value requirement
- Insulation between framing members
- Continuous R-value

**Section 802.1**

## Wall Insulation

**Section 802.1**

## Windows & Glass Doors

**Windows & Glass Doors**

- Key Elements
- Glazing Area
- SHGC values
- U-Values

**Section 802.2.3**

**Notes:**
SHGC is a measure of how much solar gain is transmitted through the window by solar radiation
The lower the SHGC value of a window the less sunlight and heat can pass through the glazing.

The SHGC requirement is affected by overhangs on a building.  The code uses the term projection factor to determine how well the overhang shades the glazing.   The PF is calculated by measuring the distance from the window to the farthest-most edge of the overhang and dividing that by the distance from the bottom of the window to the lowest point of the overhang
The greater the PF the better the window is shaded. The better the window is shaded the less important the solar heat rejection qualities of the window.  So a window with a higher SHGC value can be used to comply with the code.

If overhangs are shown on the building plans, ensure that they have been installed according to the design.

## Windows  - SHGC

- Solar Heat Gain Coefficient
- Requirements dependent on projection factor
- National Fenestration Rating                                Council (NFRC) tested
- Default SHGC range diagrams
- SHGC = SC x .87

**Section 802.2.3**

**Solar Heat **
**Gain Coefficient**

**Projection Factor (PF)**

**Notes:**
SHGC is a measure of how much solar gain is transmitted through the window by solar radiation
The lower the SHGC value of a window the less sunlight and heat can pass through the glazing.

The SHGC requirement is affected by overhangs on a building.  The code uses the term projection factor to determine how well the overhang shades the glazing.   The PF is calculated by measuring the distance from the window to the farthest-most edge of the overhang and dividing that by the distance from the bottom of the window to the lowest point of the overhang
The greater the PF the better the window is shaded. The better the window is shaded the less important the solar heat rejection qualities of the window.  So a window with a higher SHGC value can be used to comply with the code.

If overhangs are shown on the building plans, ensure that they have been installed according to the design.

## Windows – U-Factors

- NFRC tested and certified                                             or default window U-value range
- Use assembly U-value
- All windows must meet or exceed

**Section 802.2.3**

| Frame Material and Product Type | Single Glazed | Double Glazed |
| --- | --- | --- |
| Metal without thermal break
  Operable (including Sliding and swinging
     glass door)
   Fixed
  Garden Window
  Curtain Wall
  Skylight
  Site-assembled Sloped/overhead glazing | 

1.27
1.13
2.60
1.22
1.98
1.36 | 

0.87
0.69
1.81
0.79
1.31
0.82 |
| Metal with thermal break
  Operable (including Sliding and swinging
     glass door)
  Fixed
  Garden Window
  Curtain Wall
  Skylight
 Site-assembled Sloped/overhead glazing | 

1.08
1.07
1.11
1.89
1.25 | 

0.65
0.63
0.68
1.11
0.70 |
| Reinforced vinyl/metal clad wood
  Operable (including sliding and swinging glass doors)
Fixed
Skylights | 

0.90
0.98
1.75 | 

0.57
0.56
1.05 |
| Wood/vinyl/fiberglass
  Operable (including sliding and swinging    
    glass doors)
  Fixed
  Garden Window
  Skylight | 

0.89
0.98
2.31
1.47 | 

0.55
0.56
1.61
0.84 |

**Table 102.3(1)**
**U-Value Default For Windows**
**Glazed Doors and Skylights**

**Notes:**
U-Factor is a measure of how well the assembly conducts heat.  The lower the number, the better the assembly acts and an insulator.

A window U-factor is based on the interior surface area of the entire assembly, including glazing, sash, curbing, and other framing elements.  Center-of-glass U-factors cannot be used.

The code requires windows, glass doors, and skylights to be rated by National Fenestration Rating Council and to have labels that show the rated u-factor and SHGC values for the glazing unit.

If the windows, glass doors, and/or skylights are not rated, the appropriate default tables from the code can be used.

Any glazing product that is double pane with tinted glass in a thermally broken frame (e.g., wood, vinyl, or aluminum with a thermal break) will meet the requirements for a fenestration U-factor of 0.60 and an SHGC of 0.60.

## NFRC Label

_**New**_

**NFRC Label**

**National Fenestration Rating Council (NFRC) product ratings are available ****on-line at **
_**www.nfrc.org**_

**Section 802.2.3**

## Skylights

- Restricted to  3% of roof area
- Requirements based on
- U-value (NFRC tested) or
- Default U-value table

**Section 802.2.5**

**Notes:**
A skylight U-factor is based on the interior-surface area of the entire assembly, including glazing, sash, curbing, and other framing elements.  Center-of-glass U-factors cannot be used.
If an NFRC U-factor rating is available for the skylight, you should use its BB-size (ie, 48 by 48 in.) rating.
Buildings with skylight percentages over 3% of the gross roof area must use Chapter 7 or reduce the skylight area.  

## Roofs

- Requirements based on
- Assembly type
- Continuous insulation
- Insulation between framing
- All R-values -- meet or exceed

**Section 802.2.4**

**Notes:**
In some cases the WWR will affect the roof insulation requirement.
Roof insulation in buildings with attics must be installed to allow for free circulation of air through the attic eave vents.
R-values for roofs represent either cavity insulation (between framing) or insulating sheathing (continuous insulation).  
Metal buildings - there are two classes of metal building roofs.  One class uses traditional techniques that drape the insulation over the purlin and fasten the metal roof sheets through the insulation directly to the purlin.  The second class requires that a thermal block be placed between the metal roof sheet and purlin.
A thermal block consists of foam blocks or other materials/techniques that prevent heat from migrating from the purlin directly to the metal roof sheet.  Compressed fiberglass batt insulation does not qualify as a thermal block.

## Floors

- Requirements based on
- Assembly type
- Continuous insulation
- Insulation between framing
- Raised floor insulation
- Meet or exceed

**Section 802.2.6**

## Slab Edge Insulation 

- Proposed R-value must meet or exceed
- Downward from top of slab a minimum of 48” or
- Downward to at least the bottom of the slab and then horizontally aminimum of 48”

**Section 802.2.6**

**Notes:**
Slab-edge insulation may be installed vertically or horizontally on the inside or outside of foundation walls.  If installed vertically, it must extend downward from the top of the slab to the top of the footing (or 48 in., whichever is less).  If installed horizontally, it must cover the slab edge and then extend horizontally (to the interior or exterior) for a minimum total distance of 48 in.

## Below-Grade Walls 

- 85% below grade
- Proposed R-value(s) must meet or exceed required R-value

**Section 802.2.6**

**Notes:**
Where 15% or less of a below-grade wall assembly is above grade (based on exterior surface area), the below-grade wall requirement from the Envelope Requirements may be used for the entire assembly.
Below-grade wall insulation  must extend down 10 feet or the the level of the floor whichever is less.  

## IECC Chapter 8Design by Acceptable Practice 

**Envelope**

**Mechanical**

**Lighting**

- HVAC

- SWH

**Building System**

**Compliance Options**

- Energy Code Compliance

- Prescriptive Option

- Trade Off Option

**IECC Chapter 8****Design by Acceptable Practice**** **

- Performance Option

**For additional training materials on lighting and mechanical requirements see  www.energycodes.gov/training/presentations.stm**

##  More Information

-  **For additional training materials see  **
- _[www.energycodes.gov/training/presentations.stm](http://www.energycodes.gov/training/presentations.stm)_
**Code Books:**
- _[www.iccsafe.org](http://www.iccsafe.org/)_