WEBVTT 00:00.000 --> 00:06.520 Hi there, we're in lesson 2, concrete, cement, stone, masonry, and brick. 00:06.520 --> 00:11.760 And this is video 4, masonry systems, structure and finish units and mortar. 00:11.760 --> 00:16.560 In this video, we're going to focus on masonry systems, specifically looking at how masonry 00:16.560 --> 00:20.120 works as both the structural system and the finished material. 00:20.120 --> 00:25.640 We'll cover masonry units, mortar, wall assemblies, and the design decisions that influence 00:25.640 --> 00:32.760 how masonry looks and performs in interior and exterior applications. 00:32.760 --> 00:37.280 Masonry is a construction system built from individual units, such as brick, stone, 00:37.280 --> 00:39.760 or concrete masonry units. 00:39.760 --> 00:42.560 These are bound together with mortar. 00:42.560 --> 00:47.200 These units are assembled in a repetitive pattern, creating walls or surfaces that can 00:47.200 --> 00:50.600 either be structural, decorative, or both. 00:50.600 --> 00:55.640 This masonry can serve as a load bearing system or a finished material, it plays a unique 00:55.640 --> 00:59.160 role in architecture and interior design. 00:59.160 --> 01:03.280 Understanding how it's assembled helps designers make informed decisions about detailing 01:03.280 --> 01:07.520 scale and surface expression. 01:07.520 --> 01:11.600 Concrete masonry units or CMUs come in several standard sizes. 01:11.600 --> 01:18.080 The most common is the 8x8x16-inch block, but other sizes, such as 4-inch, 6-inch, and 01:18.080 --> 01:22.200 12-inch CMUs are honestly widely available. 01:22.200 --> 01:27.320 These size variations matter to designers because they directly affect the wall thickness. 01:27.320 --> 01:31.840 That thickness impacts door and window jam details, as well as how electrical and plumbing 01:31.840 --> 01:34.400 systems are routed through walls. 01:34.400 --> 01:42.600 Being aware of CMU sizes early in the design process helps avoid conflicts later during construction. 01:42.600 --> 01:46.720 Masonry systems can be either structural or veneer-based. 01:46.720 --> 01:51.800 Veneer masonry is load bearing, meaning the wall itself supports the weight of the building. 01:51.800 --> 01:56.040 Veneer masonry by contrast is decorative and non-structural. 01:56.040 --> 02:01.520 It's typically attached to a backup wall system using ties and support systems. 02:01.520 --> 02:06.240 Even though veneer masonry doesn't carry loads, it still requires careful detailing, 02:06.240 --> 02:09.320 to manage weight, moisture, and movement. 02:09.320 --> 02:14.160 Designers need to understand how veneer systems are supported and connected to ensure safety 02:14.160 --> 02:17.400 and durability. 02:17.400 --> 02:20.920 Masonry wall is often more than just a visible surface. 02:20.920 --> 02:26.600 A typical wall assembly might include CMU units as the structural core, rigid insulation 02:26.600 --> 02:31.520 for thermal performance, and a vapor retarder to control moisture movement. 02:31.520 --> 02:36.960 Additional layers such as wire mesh and plaster may be added on the interior or the exterior, 02:36.960 --> 02:39.120 depending on the desired finish. 02:39.120 --> 02:43.880 Each layer plays a role in performance, and together they affect the thickness, detailing, 02:43.880 --> 02:47.640 and the appearance of the wall. 02:47.640 --> 02:51.080 Mortar is the material that binds masonry units together. 02:51.080 --> 02:55.280 It's made from a combination of binder, sand, and water. 02:55.280 --> 03:01.600 Beyond simply holding units in place, it seals the joints between them and provides a degree of flexibility. 03:01.600 --> 03:08.680 This flexibility allows masonry walls to accommodate small movements caused by temperature changes or settling. 03:08.680 --> 03:13.320 This reduces the risk of cracking. 03:13.320 --> 03:18.000 There are several standard mortar types, each with different strength characteristics. 03:18.000 --> 03:23.240 Type N is commonly used for general purpose, above grade applications. 03:23.240 --> 03:29.640 Type N is stronger and often used for exterior walls where higher durability is required. 03:29.640 --> 03:36.240 Type M has a very high strength and is typically reserved for high structural or below grade conditions. 03:36.280 --> 03:41.760 And then there's Type O, which is softer and often used for interior or historical masonry, 03:41.760 --> 03:45.600 where compatibility with older materials is very important. 03:45.600 --> 03:54.120 Choosing the right type is as much about performance as it is about protecting the masonry units themselves. 03:54.120 --> 03:59.680 Mortar can account for 15 to 20% of a masonry walls visible surface area. 03:59.680 --> 04:04.080 This means it has a significant impact on appearance. 04:04.120 --> 04:10.960 Standard grade mortar is a most common, but white or off white can brighten a wall and create a more modern look. 04:10.960 --> 04:17.320 Dark charcoal mortar adds contrast and boldness, while color matched mortar minimizes joint visibility, 04:17.320 --> 04:20.600 allowing the masonry units themselves to stand out. 04:20.600 --> 04:27.160 For designers, the color is a key aesthetic decision, not just a technical one. 04:27.160 --> 04:32.520 The shape of mortar joints can also affect how masonry reads visually. 04:32.560 --> 04:38.560 Concave joints are classic and clean with good moisture resistance due to their compacted shape. 04:38.560 --> 04:43.720 V joints create crisp lines and strong shadows, giving a more contemporary feel. 04:43.720 --> 04:48.040 Flush joints result in minimal texture in a more monolithic appearance, 04:48.040 --> 04:54.960 while rate joints emphasize deeper shadows and are often associated with rustic or industrial aesthetics. 04:54.960 --> 05:01.480 Joint profiles influence light shadow and texture across a wall surface. 05:01.520 --> 05:05.000 Bond patterns describe how masonry walls are arranged. 05:05.000 --> 05:08.240 A running bond is the most familiar and timeless pattern. 05:08.240 --> 05:14.320 Stack bonds create a clean symmetrical look, but typically requires additional reinforcements. 05:14.320 --> 05:19.640 Herringbone patterns are dynamic and decorative, making them ideal for accent areas. 05:19.640 --> 05:25.320 Basket weave patterns are visually complex and create a sense of weight and texture. 05:25.360 --> 05:32.720 Pattern toys can dramatically change the character of a space, even when you're using the same material. 05:32.720 --> 05:35.280 And now let's talk about unit size and scale. 05:35.280 --> 05:39.160 The size of masonry units affects how a wall is perceived. 05:39.160 --> 05:43.920 Smaller bricks tend to create more texture and convey a sense of craftsmanship. 05:43.920 --> 05:49.080 Large format masonry blocks feel much more modern, minimal, and architectural. 05:49.080 --> 05:53.560 Thin brick or stone veneers offer a visual appearance of traditional masonry 05:53.560 --> 05:59.560 while reducing weight and wall thickness, making them especially useful for the interior applications. 06:01.640 --> 06:05.800 Masonry surfaces can also be modified through finishing techniques. 06:05.800 --> 06:09.760 Lime wash softens color and adds a sense of age or patina. 06:09.760 --> 06:14.440 A white wash brightens the masonry while still allowing texture to show through. 06:14.440 --> 06:20.040 Staining is often used to correct color inconsistencies or modernize older masonry 06:20.040 --> 06:22.160 without removing its character. 06:22.160 --> 06:27.880 These techniques allow designers to adapt masonry to a wide range of styles and contexts.