Insulated Headers

Please Register or Login to Provide Feedback.

Building Science-to-Sales Translator

Insulated Headers =
High-Efficiency Window Framing

Technical Description: 

In many homes, solid wood headers are installed above the windows to ensure adequate structural strength. These solid wood headers, which may consist of two 2x8 or 2x12 boards, often provide more “heft” than is needed from an engineering perspective, especially if the windows are on a non-load bearing wall. Also the large pieces of lumber are expensive and the solid wood headers create a cold spot along the walls because there is no room for insulation. On a non-load bearing wall (a gable end-wall), the header space can often be left open so it can be insulated like the rest of the wall. On load-bearing walls, the builder can install insulated headers made from plywood and rigid foam. Also, by sizing windows to align with wall framing, the builder can avoid having to put extra studs in the walls to support the windows, which will allow even more room for insulation.

Alternate Terms

Comfort Window Framing
Quiet Window Framing
High-Efficiency Window Framing
Advanced Window Framing
High-Efficiency Window Framing
Sales Message
High-efficiency window framing reduces the heat loss and gain though structural framing. What this means to you is less wasted energy along with enhanced comfort and quiet. Knowing there is one opportunity during construction to lock in quality construction, wouldn’t you agree advanced thermal protection is a great investment?

Climate

No climate specific information applies.

Description

In load-bearing exterior walls, structural headers are placed over windows and doors to pick up the load from the building above and transfer it to the posts on both sides of the window or door opening. Structural headers are a point of increased heat loss because they are made from solid or laminated framing timbers with no insulation. Proper sizing of headers allows better insulation and saves wood. Insulated headers reduce heat transfer to keep the home warmer in the winter and cooler in the summer.

In many cases, headers are overdesigned, consisting of solid wood layers that add up to the full 4- or 6-inch wall thickness. (For example, a header made of two 2x12s sandwiching a ½-inch layer of plywood is installed when a header comprised of thinner layers of plywood or OSB would provide enough structural strength and allow room for a layer of rigid foam.) In some cases, no solid wood layer is needed; in nonbearing walls, the header space can be left open and filled with insulation instead. Structural headers are not required in most interior walls or in gable-end walls with only non-bearing trusses directly above. A single flat 2x4 or 2x6 can be used as a header in interior or exterior non-bearing walls for openings up to 8 feet in width if the vertical distance to the parallel nailing surface above (usually the top plate) is not more than 24 inches. For such non-bearing headers, no cripples or blocking are required above the header (2009 IRC R602.7.2). Insulated or open headers should be used except where a framing plan provided by the builder, architect, designer, or engineer indicates that full-depth solid headers are the only acceptable option. [See 2009 IRC Tables R502.5(1) and R502.5(2) for header span requirements.]

Insulated headers can be made of rigid foam sandwiched between two layers of plywood or OSB or one layer of foam and one layer of plywood, or structural insulated panels. These can be built onsite, or pre-fabricated insulated headers can be purchased.

Headers are installed by the framers using plans provided by the designer or architect. This task should be included in the contract for the appropriate trade depending on the workflow at the specific job site. High-performance branding programs and the IECC code require that builders meet specified insulation levels. See the “compliance” tab for these specified insulation levels.

Advanced framing details throughout house including insulated and open headers 

Firgure 1 - Structural headers are used above the windows on the bearing walls in this drawing but the wood layer is properly sized (no thicker than necessary) to allow for a layer of rigid insulation. On nonbearing walls, the headers are open allowing for the space above the windows to be insulated to the same level as the rest of the wall. 
Reference

How to Install an Insulated Header on a Bearing Wall


1. Use pertinent code requirements to determine minimum header lumber requirements. [See for example, 2009 IRC R602.7 and Tables R502.5 (1) and (2).] Install a properly sized prefabricated header or fabricate the header onsite from one piece of rigid foam and one or two pieces of plywood; see Figures 2 and 3.

Insulated header made of two pieces of plywood that sandwich a layer of rigid foam insulation

Figure 2 - Insulated header made of two pieces of plywood that sandwich a layer of rigid foam insulation  Reference

Insulated header made of one piece of plywood aligned with exterior wall, with room for insulation to inside

Figure 3 - Insulated header made of one piece of plywood (or two if needed) aligned with exterior wall, leaving room for insulation toward inside  Reference

2.  Eliminate jack studs (also known as shoulder studs) on load-bearing walls by hanging structural headers with metal hangers instead. Note that jack studs are not needed on non-bearing walls. Eliminating jack studs will reduce the available nailing area for siding and trim if nailable sheathing (e.g., plywood or OSB) is not used. If needed, attach a 2x2 wood nailer to the outside edge of the stud for siding attachment.

Insulated headers can be hung with metal hangers instead of jack studs to reduce lumber usage

Figure 4 - Insulated headers can be hung with metal hangers instead of jack studs to reduce lumber usage  Reference

How to Insulate a Header on a Non-Bearing Wall

  1. Install a single flat 2x4 or 2x6 at the top of the door or window rough opening as the header in interior or exterior non-bearing walls for openings up to 8 feet in width if the vertical distance to the parallel nailing surface above (usually the top plate) is not more than 24 inches. For such non-bearing headers, no cripples or blocking are required above the header (2009 IRC R602.7.2). Insulate the cavity above the header in the same manner as the rest of the wall.   

Structural headers are not needed on nonbearing walls 

Figure 5 - Structural headers are not needed on nonbearing walls; the open space above the window can be filled with the same insulation as the other wall cavities Reference

Ensuring Success

It may be possible to detect heat loss at the headers with an infrared camera, if a sufficient temperature difference exists between the outside and the conditioned space of the house. The quality of installation of the insulation should be visually inspected by the site supervisor before the drywall is installed.

Scope

All headers above windows and doors insulated

Reduced Thermal Bridging

Install headers with a minimum R-3 insulation value in wall assemblies with 2x4 framing, or equivalent width, and R-5 for all other assemblies (e.g., with 2x6 framing). Use one of the methods listed below or an equivalent assembly:

  1. Continuous rigid insulation sheathing
  2. SIP headers
  3. Two-member headers with insulation in between
  4. Single-member headers with insulation on one side

ENERGY STAR Notes:

All items of 4.4.5a-4.4.5e must be installed to comply with 4.4.5 and ENERGY STAR.

Mass walls utilized as the thermal mass component of a passive solar design (e.g., a Trombe wall) are exempt from this Item. To be eligible for this exemption, the passive solar design shall be comprised of the following five components: an aperture or collector, an absorber, thermal mass, a distribution system, and a control system. See DOE's guidance for passive solar home design.

Mass walls that are not part of a passive solar design (e.g., CMU block or log home enclosure) shall either utilize the strategies outlined in Item 4.4 (of the ENERGY STAR Thermal Enclosure System Rater Checklist). Or, the pathway in the assembly with the least thermal resistance, as determined using a method consistent with the 2009 ASHRAE Handbook of Fundamentals, shall provide >= 50% of the applicable assembly resistance, defined as the reciprocal of the mass wall equivalent U-factor in the 2009 IECC – Table 402.1.3. Documentation identifying the pathway with the least thermal resistance and its resistance value shall be collected by the rater and any Builder Verified or Rater Verified box under Item 4.4 (of the ENERGY STAR Thermal Enclosure System Rater Checklist) shall be checked.

Compliance options include continuous rigid insulation sheathing, SIP headers, other prefabricated insulated headers, single-member or two-member headers with insulation either in between or on one side, or an equivalent assembly, except where a framing plan provided by the builder, architect, designer, or engineer indicates that full-depth solid headers are to be used. The Rater need not evaluate the structural necessity of the details in the framing plan to certify the home. Also, the framing plan need only encompass the details in question and not necessarily the entire home. R-value requirement refers to manufacturer’s nominal insulation value.

Training

Right and Wrong Images

Presentations

None Available

Videos

None Available

CAD Images

Compliance

ENERGY STAR Version 3, (Rev. 07)

Thermal Enclosure Checklist, Reduced Thermal Bridging. Mass walls utilized as the thermal mass component of a passive solar design (e.g., a Trombe wall) are exempt from this Item. To be eligible for this exemption, the passive solar design shall be comprised of the following five components: an aperture or collector, an absorber, thermal mass, a distribution system, and a control system. See DOE's guidance for passive solar home design. Mass walls that are not part of a passive solar design (e.g., CMU block or log home enclosure) shall either utilize the strategies outlined in Item 4.4 (of the ENERGY STAR Thermal Enclosure System Rater Checklist). Or, the pathway in the assembly with the least thermal resistance, as determined using a method consistent with the 2009 ASHRAE Handbook of Fundamentals, shall provide >= 50% of the applicable assembly resistance, defined as the reciprocal of the mass wall equivalent U-factor in the 2009 IECC – Table 402.1.3. Documentation identifying the pathway with the least thermal resistance and its resistance value shall be collected by the rater and any Builder Verified or Rater Verified box under Item 4.4 (of the ENERGY STAR Thermal Enclosure System Rater Checklist) shall be checked.

Compliance options include continuous rigid insulation sheathing, SIP headers, other prefabricated insulated headers, single-member or two-member headers with insulation either in between or on one side, or an equivalent assembly, except where a framing plan provided by the builder, architect, designer, or engineer indicates that full-depth solid headers are to be used. The Rater need not evaluate the structural necessity of the details in the framing plan to certify the home. Also, the framing plan need only encompass the details in question and not necessarily the entire home. R-value requirement refers to manufacturer’s nominal insulation value.
 

DOE Zero Energy Ready Home

Exhibit 1: Mandatory Requirements. Certified under ENERGY STAR Qualified Homes Version 3. Ceiling, wall, floor, and slab insulation shall meet or exceed 2012 IECC levels and achieve Grade 1 installation, per RESNET standards.

2009 IECC

Table 402.4.2 Air Barrier and Insulation Inspection Component Criteria, Walls: Corners, headers, narrow framing cavities, and rim joists are insulated.* Table 402.4.2 Air barrier and thermal barrier: Exterior wall insulation is installed in substantial contact and continuous alignment with the air barrier. Air permeable insulation is not used as a sealing material.*

2009 IRC

Table N1102.4.2 Air Barrier and Insulation Inspection Component Criteria, Walls: Corners, headers, narrow framing cavities, and rim joists are insulated.* Table N1102.4.2 Air barrier and thermal barrier: Exterior wall insulation is installed in substantial contact and continuous alignment with the air barrier. Air permeable insulation is not used as a sealing material.*

2012 IECC

Table R402.4.1.1 Air Barrier and Insulation Installation, Walls: Corners, headers, and rim joists making up the thermal envelope are insulated.* Table R402.4.1.1, Air barrier and thermal barrier: A continuous air barrier is installed in the building envelope including rim joists and exposed edges of insulation. Breaks or joints in the air barrier are sealed. Air permeable insulation is not used as a sealing material.*

2012 IRC

Table N1102.4.1.1 Air Barrier and Insulation Installation, Walls: Corners, headers, and rim joists making up the thermal envelope are insulated.* Table N1102.4.1.1, Air barrier and thermal barrier: A continuous air barrier is installed in the building envelope including rim joists and exposed edges of insulation. Breaks or joints in the air barrier are sealed. Air permeable insulation is not used as a sealing material.*

*Due to copyright restrictions, exact code text is not provided.  For specific code text, refer to the applicable code.

Please Register or Login to Provide Feedback.

More Info.

Case Studies

  1. Author(s): PNNL
    Organization(s): PNNL
    Publication Date: April, 2012

    Case study about a home builder that has refined its home designs to achieve HERS scores of 49 to 56 on 40 to 70 homes per year.

References and Resources*

  1. Author(s): APA - The Engineered Wood Association
    Organization(s): APA - The Engineered Wood Association
    Publication Date: January, 2014

    Detailed guide to advanced framing, a system of construction framing techniques designed to optimize material usage and increase energy efficiency.

  2. Author(s): NAHB, Southface Energy Institute, ORNL, NREL
    Organization(s): NAHB, Southface Energy Institute, ORNL, NREL
    Publication Date: January, 2002

    Information sheet about advanced wall framing.

  3. Author(s): Green Building Advisor
    Organization(s): Green Building Advisor
    Publication Date: December, 2013

    Information sheets containing plans and details for advanced framing.

  4. Author(s): Lstiburek
    Organization(s): BSC
    Publication Date: February, 2010

    Report detaining advanced framing techniques, including discussion of cost and energy savings.

  5. Author(s): DOE
    Organization(s): DOE
    Publication Date: April, 2014

    Standard requirements for DOE's Zero Energy Ready Home national program certification.

  6. Author(s): EPA
    Organization(s): EPA
    Publication Date: June, 2013

    Standard document containing the rater checklists and national program requirements for ENERGY STAR Certified Homes, Version 3 (Rev. 7).

  7. Author(s): DOE
    Organization(s): DOE
    Publication Date: March, 2011

    Document providing supplemental information for code enforcement professionals about headers in nonbearing walls.

  8. Author(s): EPA
    Organization(s): EPA
    Publication Date: October, 2011

    Guide describing details that serve as a visual reference for each of the line items in the Thermal Enclosure System Rater Checklist.

Last Updated: 08/15/2013

Mobile Field Kit

The Building America Field Kit allows you to save items to your profile for review or use on-site.