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Louisiana Energy Code Compliance for Metal Buildings: Insulation Requirements

This guide outlines the energy code requirements for heated and semi-heated metal buildings in Louisiana, as per the ASHRAE 90.1 standards. For conditioned spaces, roofs must achieve a U-value of 0.065 with R-15.3 insulation, while walls require a U-value of 0.113 with R-9 insulation. In semi-heated buildings, roofs must attain a U-value of 0.167 (R-6) and walls a U-value of 0.184 (R-5.5). Thermal blocks and additional insulation details are provided to help ensure compliance. Consult your local building code official for further information.

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Louisiana Energy Code Compliance for Metal Buildings: Insulation Requirements

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  1. Building Energy Code Requirements Presented by: The leader in metal building insulation

  2. Louisiana – ASHRAE 90.1 1999

  3. ASHRAE 90.1 2001 Commercial Code: ASHRAE/IESNA 90.1-2001, and 2000 IECC for buildings not covered by ASHRAE, mandatory statewide; can use COMcheck to show compliance. ACT 12 does not affect the commercial energy code

  4. ASHRAE 90.1 2004Louisiana • Heated (condition buildings) • Roofs and Ceilings: U value of .065 • Walls: U value of .113 • In “R” value terms it means the following: • Roofs and Ceilings: In place R-15.3 • Walls: In place R-9

  5. Insulation compression and reduction of R-Values A loss in R-Value occurs when the insulation is compressed between the roof and walls structurals and the exterior metal skin.

  6. Metal Building Roof Requirements Conditioned Building In order to achieve a U-Value of .065 (in place R-15.3) in the roof the following is required • 6” of R-19 metal building fiberglass insulation • Thermal Blocks – are required • This will achieve an in place R-value of R-15.4

  7. Metal Building Wall Requirements Conditioned Building In order to achieve a U-Value of .113 (in place R-8.9) in the walls the following is required • 4” of R-13 metal building fiberglass insulation • Thermal Blocks – not required • This assembly will achieve an in-place R-Value of R-8.9

  8. ASHRAE 90.1 2001Louisiana • Semi-Heated • Roofs and Ceilings: U value of .167 • Walls: U value of .184 • In “R” value terms it means the following: • Roofs and Ceilings: In place R-6 • Walls: In place R-5.5

  9. Metal Building Roof Requirements Semi-Heated Building In order to achieve a U-Value of .184 (in place R-6) in the roof the following is required • 3” Thick of R-10 metal building fiberglass insulation • Thermal Blocks – are not required • This will achieve an in place R-value of R-6.5

  10. Metal Building Wall Requirements Semi-Heated Building In order to achieve a U-Value of .184 (in place R-5.5) in the walls the following is required • 3” of R-10 metal building fiberglass insulation • Thermal Blocks – not required • This assembly will achieve an in-place R-Value of R-7

  11. Summary If you have any questions you can consult your local building code official.

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