Mortar is made up of varying amounts of hydrated lime, Portland cement, and sand combined to create a mix that meets a certain requirement. Recipe: Type S contains 2 parts Portland cement, 1 part lime and 9 parts sand. Here are some projects that typically use type S: A type M mix has the highest highest amount of Portland which gives it a minimum of 2,500 psi of compressive strength. When properly installed and tooled, repointed mortar joints are often better compacted than the original mortar since the mortar is placed in thin layers that are compacted separately. For example, certain building codes don’t permit the use of non flexible mortar in any part of the lateral force resisting system. Generally, this type of mortar is not used in exterior constructions and places where there are high wind pressures. In addition, within these mortar types, there are mortars specifically designed for use in stone veneer and glass block installations. Things like high lateral loads from wind or seismic activity possibly requiring a mortar with higher flexibility. Here are some projects that typically use type M: Type O mortar mix has a fairly low compressive strength, rated at only about 350 psi. It is used in above grade, non-load bearingsituations in both interior and exterior environments. If you’re working on an outdoor project, keep in mind that lighter shades will show dirt more easily than a dark color. In some cases, it can be used instead of Type N for interior projects where it is sheltered from the elements. If you’re looking for the right mortar mix, consider type N. It’s the best choice for general applications and likely the perfect choice for your project. Type K mortar is no longer included in the ASTM C 270 specification; however, it is still sometimes used in historic preservation projects. Both interior and exterior masonry work is a beautiful look that’s low maintenance, extremely durable, lasts decades and is proven to increase home value, if it’s done in the right way. We recommend type N mortar for use on exterior, above grade projects that are exposed to severe weather and high temperatures, as well as on interior, load bearing applications. Type O mortar employed for interior non-load-bearing applications with very limited exterior use. Mortar is an all around building material that’s an essential part of construction. Spec Mix ® Portland Lime & Sand Mortar is a dry, preblended mortar mix containing Portland cement, hydrated lime and dried masonry sand formulated for superior bond, water retention and board life. Whether you’re a builder, mason, or homeowner working with veneer, you’ll eventually have to buy some mortar. MasonCare 300 conforms to ASTM It has a high compression strength and it’s easy to work with. There are five main types of mortar: M, S, N, O, and K. Each type is classified by it’s bonding properties, flexibility, and compressive strength. Recipe: Type O is made of 1 part Portland cement, 2 parts lime, and 9 parts sand. The binding strength of this mortar is low. Type O mortar is the lowest strength mortar. NOTE 1—When the property specification is used to qualify masonry mortars, the testing agency performing the test methods should be evaluated in accordance with Practice C1093. Its low compressive strength makes it a good option for soft stone applications such as setting sandstone or brownstone. When it’s hard, mortar is durable and helps resist moisture. Type O mortar, or high-lime mortar, a softer mortar with a low compressive strength of 350 psi, is best suited to repointing for several reasons. In the appendix for ASTM C 270, Type O mortar is listed as an alternative to Type N for areas exposed to freezing. Glass block mortar is a … In the appendix for ASTM C 270, Type O mortar is listed as an alternative to Type N for areas exposed to freezing. Did you know you can mix your own mortar. Recipe: Type K is made from 1 part Portland, 3 parts lime, and 10 parts sand. We use type S for below grade work because it’s a little stronger and better at resisting the force created by soil pressing against the foundation. Because without the right type of mortar your work will suffer. Instead, it is best suited for indoor projects that are above grade. For ASTM C90 concrete block, the assembly compressive strength only increases 250 psi when the mortar is changed from Type N to Type S (from an f’ m of … Copyright © 2021 Gambrick Construction – website by On Your Mark Design and Graphics. Type S – General all purpose mortar with higher bond strength. Set Accelerated Mortar – Color (SA-05) p. Set Delayed Mortar – Type M (SD-01) q. 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Color, flexibility, easy to work with or other properties should be considered. It is used primarily interior, above-grade, non-load–bearing walls. If you choose a type with a compressive strength that’s too high, you may end up with cracks and exterior projects that get worn down by the freeze thaw cycle. Soft stone masonry: Type N is what we recommend. Applicable ASTM Specifications. other mortar grades Mortar is given a grade based on its composition and the uses for which it has been designed. Harder mortar can cause cracking or spalling of the brick units, which is far more serious than deterioration of the mortar. All built with different mortar types. In general, the higher content of cement within the mix gives the mortar durability and strength, however add too much and the mortar will crack and shrink, and maybe also lose it’s ability to … Which is recommended for each application. Stacked brick or cement below grade block walls (cmu): Here we like Type S. It’s stronger than type N so it holds up better to pressures from things like soil. Pro Tip: We recommend using type S mortar for veneer work. This mortar has very limited exterior use. Selecting the right mortar isn’t an exact science because of all the variables involved with each project. Set Accelerated Mortar – Type N (SA-01) o. The consistency and ease of applying type O mortar mix make it suitable for pointing work and repairing existing structures. Type O mortar has the weakest compressive strength, approximately 350 PSI. Compression strength is important to consider for a few key reasons. Repointing where the structural integrity of the wall is intact. And the pros and cons of each. Properties of Mortar 5. Stacked brick or cement above grade block walls (cmu): For this we prefer type N It has a good compression strength and it’s easy to spread which makes it great for both installing the masonry and grouting the joints. There are five main types of mortars we use in construction. If you have any questions or comments e-mail us any time. Because of these properties, type S is what we recommend for most below grade applications such as masonry foundations and sewers. Stronger types have less flexibility and are generally harder to work with. Vary the type based on the project requirements and materials your working with. It’s used primarily for interior work and above grade, non load bearing walls. When it comes to stacked brick or block or even stone, a high compression strength is what’s most important. Each mortar type is specially made to fit a certain application. Type N, S, O and M. Below we’ll discuss each type in detail along with it’s most common usage and some pros vs cons. Mortar is made up of varying amounts of hydrated lime, Portland cement, and sand combined to create a mix that meets a certain requirement. The minimum compressive strength of Type O mortar is 350 psi. But you should choose a type with a compression strength lower than that of the product you’re installing. Budgeting and Scheduling 9. Repointing: Type N or type O are what we use for repointing. This mortar mix has a medium compressive strength. Tuck Pointing Mortar AMX 420. Get Notified About New Articles, GREAT DEALS on Home Goods, Videos & Product Reviews. It’s also great for thin brick or stone veneer work because of it’s higher bonding strength and stickiness. Restoring historical buildings: Type K. For this type of work type K is the best choice. If your mixing the mortar yourself then you can vary your ingredients based on the strength requirements you need. Masonry is very stiff once the mortar completely hardens which makes it susceptible to cracks. The 2018 Spec Mix Bricklayer 500 World Championship is Coming to Vegas! Certification Letter - Type O Non-Pigmented Tuckpoint Mortar 1 file(s) 191.00 KB. The resulting joints are tight and well filled and, therefore, allow very little water penetration. Water-vapor transmission results indicate that all NHL mortars process water vapor at much higher rates than dolomitic and both Type-O mortars, with values comparable to … The amount of surface contact required between the mortar and stone veneer or other masonry unit is why extent of bond is another key factor that needs consideration. So how do you choose the right mortar type for your project? No single type is best for all applications. Type O mortar does not have the same strength as type N mortar and is therefore not used for load-bearing walls or exterior walls exposed to high winds or weather. Mortar is what holds two building materials together into one solid unit. And it should also have the right properties in its workable state so that it’s easy to work with. Physical properties include 28-day compressive strength, water retention and air content. Download. First, consider the material you’ll be working with and the kind of work you’ll be doing. Type O is a lime rich mortar and is also referred to as "pointing" mortar. Type O mortar This uses a 1 / 2 / 9 mix and results in a mortar with a 350 psi compressive strength. While mortar’s first and most important job is being the glue that holds your project together, It’s not the only job mortar does. Tuck Pointing Mortar. Size Type Color Add to cart Different types of mortar exist for a variety of applications. Mortar typically comes in neutral colors such as white, buff, and light or dark gray. Pro Tip: We recommend type N for most stacked brick or cmu block walls that are above grade. It is used on non-load bearing interior projects. Download . Historical Background 2. I want to repoint large sections of my brick house with type-o mortar mix. Because sometimes masonry needs to have a little flexibility and a super stiff mortar just won’t work. Type K – Extremely low strength used primarily for historical restoration work. Identifying the Problem Before Repointing 3. TYPE O MORTAR - DIVISION 04 MASONCARE 300 mixing strength With satisfaction MasonCare 300 is a pre-blended, pre-packaged Type O mortar specifically designed for use in repointing and non-load-bearing wall applications. If you do decide to mix your own, make sure you only use clean sand and clean water. Concrete Construction: Resources for contractors and specifiers including construction methods, materials and practices, 12 Regional Winners of the 2018 SPEC MIX BRICKLAYER 500, Entries Open for 2018 Brick in Architecture Awards, New Bill Aims to Extend EPA Emissions Timeline. High bond strength provides resistance to cracking. A combination of factors should go into your mortar selection based on the job your doing. Interior work: Type O is great for interior masonry work. Type N – General all purpose mortar with good bonding. If you buy premixed mortar then check the bag, it will list the PSI strength of the mix. Type N has a medium compressive strength of 750 psi and can achieve 28 day strength between 1500 and 2400 psi. There’s less waste because you only use as many bags as you need. The porous quality of type K allows very little movement due to temperature and moisture fluctuations. It’s often used to repair mortars and is generally used with sandstone and other materials with low compressive strength, since it’s very flexible. This is because type O mortar, after drying, is noticeably weaker than the basic type N. In fact, it is not recommended for load-bearing use due to its meager 350 psi compression strength. This mortar is a blend of Portland cement, Type S hydrated lime, masonry sand and other carefully selected components. Execution of the Work 11. Compression or compressive strength is the capacity of a material or structure to withstand loads that are placed on top of the mortar which can cause it to reduce in size or compress. It has a high bonding strength and it’s sticky which is perfect for sticking stuff to a wall. Some mortar needs to harden strong yet have some flexibility, allowing it to handle lateral loads. Mortar Type and Mix 8. Generally speaking, you should use one of the standard mortar types listed on this page for the applications we recommend unless your architect or engineer specifies something different. Type O Mortar. Brochure - WORKRITE Cement Products Portfolio We Update Weekly & It’s All Completely FREE. The first reason is that type O mortar is softer than the older bricks, and it allows the bricks to expand or … Pro Tip: Mortar is caustic, so always wear gloves and other safety equipment when mixing or working with mortar. Even though looks should be a secondary concern to structure, the color of your mortar is still important. In this article we’ll review each type of mortar. Sometimes it’s used as a finished product that you see. Type O – Low strength used mostly for interior applications and restoration work. Finding an Appropriate Mortar Match 4. They can happen from a number of common causes like moisture, weather, movement, or other issues. But you need the right mortar type for the job. You don’t need to worry as much about pulling them apart because they’re generally held together by rebar or other metal ties. Type O Mortar Uses: Interior non-load-bearing applications with very limited exterior use. Higher extent of bond increases durability and water resistance which makes it ideal for veneer work. Note: Type M, S and N are the most commonly used mortar types. So how do you choose the right mortar type for your project? You generally can’t order a small load of lime, sand and cement without paying a delivery fee. Type M – High compressive strength. WORKRITE® Tuckpoint colored mortar is a Type O, lime-based cement designed with minimal percentage of Portland Cement to create a mortar for use in restoration and tuck-pointing applications. And when in doubt, hire a professional. Mortar bonds two masonry units together so they function as a single unit. They’re easier to work with and save time because you don’t have to mix then. Because some can flex and absorb a certain amount of movement and some can’t, choosing the right type can help protect the structural integrity of your project. For example some designers tint the grout color for stone veneer rather than keeping it natural. Select a type with the lowest compressive strength that meets the project requirements. Other problem areas may include below grade durability issues or inside retaining walls. Type K Mortar. To get 1 cuyd of O mortar, you need 27 cubic feet of the components in a 1 to 2 to 9 proportion. Type O can be used as an alternative to Type N for some interior applications, but its exterior use is limited due to its low structural capacity. Masonry exposed to weather in a nominally horizontal surface is extremely vulnerable to weathering. We’ll provide a table with the proportions for each mortar type below. Below is a list of properties you should consider when choosing mortar. Mill Test - Type O Colored Tuckpoint Mortar 1 file(s) 108.22 KB. Bond strength is the force required to separate the mortar from the brick. There is no single best or all purpose mortar. Mortar Analysis 6. Each type has some basic characteristics you need to understand: Although the general descriptions above provide some basic characteristics, each type can be used in a variety of applications. Contractor Selection 10. It’s great for repointing brick and similar repair work on existing walls because of its consistency and how easy it is to work with. Before choosing which type is best, it’s important to consider the jobs structural requirements. Properties of four types of mortar are defined by the specification: S, M, N, and O, with Type S being the hardest with an average compressive strength of 2500 psi (1.7 MPa) and Type O being the weakest at 350 psi (2.4 MPa).

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