Pattress plates dot the outer wall of a building. The tie rod screws into the pattress plate and anchors the masonry wall to the floor structure. Credit: Spencer Means, via Flickr CC BY-SA 2.0

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Pattress plates dot the outer wall of a building. The tie rod screws into the pattress plate and anchors the masonry wall to the floor structure. Credit: Spencer Means, via Flickr CC BY-SA 2.0

Pattress plates dot the outer wall of a building. The tie rod screws into the pattress plate and anchors the masonry wall to the floor structure. Credit: Spencer Means, via Flickr CC BY-SA 2.0

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