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LEED Advantages for IMPs
IMPs offer many LEED advantages for your building projects for the following credits and prerequisites assuming LEED-NC 2010:
- LEED low-slopes compliant colors for Credit SS 7.1
and 7.2 for Heat Island Effect
- LEED steep-slope compliant colors for Credit SS 7.1
and 7.2 for Heat Island Effect
- EA Prerequisite 2: Minimum Energy Performance
(Outperforming ASHRAE 90.1 by 10%)
- EA Credit 1 : Optimize Energy Performance
(Outperforming ASHRAE 90.1 by more than 10%)
- Credit MR 4.1 and 4.2: Recycled Content
Understanding LEED and IMPs
SS Credit 7.2: Heat Island Effect: Roof – 1 point
Intent: To reduce heat islands to minimize impacts on microclimates as well as human and wildlife habitats.
Requirement: Use roofing materials with a solar reflectance index (SRI) equal to or greater than 78 for low-sloped roofs (less than or equal to 2:12) or 29 for steep-slope roofs (greater than 2:12) for a minimum of 75% of the roof surface.
Solution: IMPs can be ordered with paints that meet the requirements of this credit. Our Solar White and Bone White hav an SRI of 82 and all colors have SRIs of 29 or more.
EA Prerequisite 2 – Minimum Energy Performance
EA Credit 1 – Optimize Energy Performance
Intent: To achieve increasing levels of energy performance beyond the prerequisite standard to reduce environmental and economical impacts associated with excessive energy use.
Requirement: At least one point must be achieved on this credit. There are three options to follow:
- Whole building Energy Simulation (1-19 points)– A computerized energy model demonstrating that the energy cost of the building is less than that of a minimally compliant building under ASHRAE 90.1-2007. The points awarded are determined by how much of a reduction is achieved.
- Following the recommendations of the ASHRAE Advanced Energy Design Guide (AEDG) for either Small Office Buildings, Small Retail Buildings, or Small Warehouses and Self Storage Buildings as applicable. (1 point)
- Comply with the prescriptive measures identified in the Advanced Buildings™ Core Performance™ Guide developed by the New Buildings Institute. (1-3 points)
Solution: IMPs provide a continuous, high-performing layer of insulation that does not compress between framing members. This layer also works in synergy with the metal skins to give the panels their excellent strength and rigidity. Below are U-values and R-factors for various panel thicknesses.
| Panel Thickness |
U-value* |
R-factor* |
| 1 ½” |
0.0934 |
10.7 |
| 2” |
0.066 |
15.1 |
| 2 ½” |
0.054 |
18.7 |
| 3” |
0.045 |
22.3 |
| 4” |
0.034 |
29.4 |
| 5” |
0.0280 |
35.7 |
| 6” |
0.0233 |
42.8 |
*Including air film on each side of panel
When installed properly, IMPs also make excellent continuous air barriers, which are part of the ASHRAE AEDG recommendations.
MR Credit 4: Recycled Content: 10% and 20%
Intent: To increase demand for building products that incorporate recycled content materials, thereby reducing impacts resulting from extraction and processing of virgin materials.
Requirement: Use materials with recycled content such that the sum of post-consumer recycled content plus 1/2 of the pre-consumer content constitutes at least 10% or 20%, based on cost, of the total value of the materials in the project.
Solution: IMPs are made with metal skins containing 25.5% post-consumer recycled content and 6.8% pre-consumer recycled content by weight. The recycled content based on cost varies based on other materials present on the project.
Recycled Content for Panels
Other Credits to Consider
Water Efficiency Credits 1-3: Metal roofs make excellent collectors for rainwater harvesting. Reuse of captured water can help substantially with these credits.
Fundamental and Enhanced Commissioning, EA Prerequisite 1 and Credit 3: Fiberglass insulation will compress when placed between framing members. Due to this effect, many building commissioning agents (CxAs) require commissioning of the building envelope. This would include probing of insulation layers to ensure they have recovered, or returned close to their original thickness away from the framing members. This is not an issue with IMPs. |
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