| CPC E04B 1/665 (2013.01) [E04B 1/66 (2013.01); F16L 5/00 (2013.01); F16L 5/10 (2013.01); H02G 3/22 (2013.01)] | 23 Claims |

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1. A method of sealing around a penetration that extends out of a wall of a building, the wall comprising structural members separated by spaces and the penetration being positioned in one of the spaces, the method comprising the steps of:
installing a weather barrier across the spaces between the structural members of the wall, the weather barrier being attached directly to the structural members and closing the spaces, the weather barrier defining an inner surface that faces the spaces and a wall surface opposite the inner surface and such that the penetration extends through the weather barrier and past the wall surface, the weather barrier comprising a flexible sheet of material;
installing a backer support adjacent to the inner surface of the weather barrier and opposite the wall surface and adjacent to the penetration, the backer support extending at least partially across a width of the one of the spaces that corresponds to the penetration and only a portion of a height of the one of the spaces; and
sealing the penetration to the weather barrier by applying a sealing material around the penetration, the sealing material sealing directly between the penetration and the weather barrier, the backer support being sufficiently rigid to support the weather barrier and the sealing material against pressure applied during installation.
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