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[SEAOC] RE: [SEAOC] Type M vs Type S mortar[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc <seaoc(--nospam--at)power.net>
- Subject: [SEAOC] RE: [SEAOC] Type M vs Type S mortar
- From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
- Date: Tue, 03 Sep 96 15:18:00 PDT
- Encoding: 72 TEXT
Workablity: The biggest issue from the masons perspective is board life. M mortar has a shorter board life. S mortar is much more prevalent outside of the west coast for most structural applications. Generally in projects that I have worked on throughout the US, S mortar is specified for the perimeter and structural walls, M mortar is specified for back parging and below grade applications. Performance: In applications where wind driven rain can be an issue, S mortar is generally accepted as superior to M mortar. M mortar has a higher cement content, and will generally shrink more. With M mortar being restricted to subgrade and back parging, board life is not as great an issue as it is once you start going up the scaffold. S mortar's higher lime content also acts as a "crack healer". See the article by Walker and Gutschick in The Magazine of Masonry Construction, July 1988. Local practices: Construction techniques and standards are highly regionalized in the US for masonry, wood, and for some specific steel details. It becomes even more of an issue in foreign work where local rebar sizes and strengths are just one of many nuances encountered. I am sure your plans and specs. are correct and accurate, but it is often better to try to accommodate local practices and avoid a dispute. Unless the cost difference is significant, you may wish to use this as you owe me one. HOS Black & Veatch spragueho(--nospam--at)bv.com ---------- From: seaoc To: seaoc Subject: [SEAOC] Type M vs Type S mortar Date: Tuesday, September 03, 1996 6:49PM We routinely specify Type M mortar on jobs. No one has ever complained. We recently completed drawings for a high school in Colorado. We used our standard specification for mortar and have received a request for change to Type S. The contractor must not see it often. But he *did* bid the job from plans that included the Type M spec. He will need to credit my client. Aside from strength what are the relative benefits of the two types of mortar? Thanks, Mark Mark E. Deardorff, SE Deardorff & Deardorff, Inc. San Diego, CA markedd(--nospam--at)ix.netcom.com ... ...
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