Masonry Magazine September 2002 Page. 20
Cover STORY
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More importantly, often the introduction of additional materials into a masonry arch reduces the benefits of single trade responsibility as related to tolerances and overall building performance.
The introduction of non-masonry materials presents a variety of challenges to the mason craftworker. Along with scheduling complications, consideration should also be given to how a non-masonry trade may affect the overall tolerances in the final arch.
By code, tolerances differ from material to material. Masonry materials are often required to adhere to tolerances that are more stringent than other materials, such as structural steel. As such, it is possible to have both materials fall within industry tolerance and still face significant coordination issues.
The higher permitted variances in structural steel, for example, can adversely effect the more strict tolerances required of masonry. Loose tolerances can lead to the entry of water and moisture, factors that ultimately have a negative impact on the building's overall performance. In an all masonry arch, this possibility does not exist.
Today the masonry education extended to young designers by The International Masonry Institute, Bethesda, Md., includes arch design and arch construction principles. Young designers are eager to understand how they can introduce unreinforced masonry arches in their building projects.
This eagerness is particular apparent at IMI's annual Masonry Camp, which brings together apprentice masons and intern architects or graduate students to learn the value of collaboration through a design/build challenge, and the beauty of masonry through hands-on familiarization sessions with skilled union instructors. At Masonry
During his arches lecture at IMI Masonry Camp, Special Projects Coordinator Matt Redabaugh tries to convey the arch's timelessness, in both its predictability as a functional masonry form, and its potential for beauty.
18 Masonry
September 2002
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