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This space in the attic of the Passive House in Bethesda, Md., shows one of the SIPs, or structurally insulated panels. All joints are taped and/or insulated to help prevent any air leaks. The insulation and sealing are two of the most important components of the Passive House. According to Brendan O'Neill Jr. with the O'Neill Development Corporation, a governing body must certify all work in the house to make sure it meets Passive House standards. This image was made Monday, April 18, 2011. (Barbara L. Salisbury/The Washington Times)

This space in the attic of the Passive House in Bethesda, Md., shows one of the SIPs, or structurally insulated panels. All joints are taped and/or insulated to help prevent any air leaks. The insulation and sealing are two of the most important components of the Passive House. According to Brendan O'Neill Jr. with the O'Neill Development Corporation, a governing body must certify all work in the house to make sure it meets Passive House standards. This image was made Monday, April 18, 2011. (Barbara L. Salisbury/The Washington Times)

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