Need a book? Engineering books recommendations...
[SEAOC] Re: [SEAOC] Type M vs Type S mortar[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)power.net
- Subject: [SEAOC] Re: [SEAOC] Type M vs Type S mortar
- From: "Bill Sherman" <SHERMANWC(--nospam--at)cdm.com>
- Date: Wed, 4 Sep 1996 14:40:58 +0500
According to the 1993 "Masonry Designer's Guide" by The Masonry Society: "Do not use a higher compressive strength mortar than necessary....Unless dictated by the compressive strength requirement, avoid the selection of Type M mortar over Type S mortar. However, when masonry is in direct contact with soil, e.g. in retaining walls, Type M mortar should be used regardless of strength requirements." According to PCA IS278.01M, "Factors affecting Bond Strength of Masonry": "...the finding that little or no increase in bond strength is achieved by the use of Type M mortars as compared to Type S mortars". Type N mortar is considered better in Colorado's dry climate since it has holds moisture better and doesn't dry out as quickly, although Type S can be used. Type M mortar is a harsher mortar. Bond may be more important than compressive strength and if the mortar dries out, it may not bond well. I recommend specifying/ allowing Type S mortar for most structural applications.
--- Begin Message ---
- To: seaoc(--nospam--at)seaoc.org
- Subject: [SEAOC] Type M vs Type S mortar
- From: "Mark Deardorff" <markedd(--nospam--at)ix.netcom.com>
- Date: 03 Sep 96 18:49:26We 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 ...
--- End Message ---
- Prev by Subject: [SEAOC] RE: [SEAOC] Type M vs Type S mortar
- Next by Subject: [SEAOC] Re: [SEAOC] Type M vs Type S mortar
- Previous by thread: [SEAOC] RE: [SEAOC] Type M vs Type S mortar
- Next by thread: [SEAOC] Re: [SEAOC] Type M vs Type S mortar