HALF BRICK PARTITION WALL.pptx

Half brick partition wall

1. HALF BRICK PARTITION WALL

2. BRICK PARTITION WALL Brick Partition walls are only made of plain bricks . Brick walls are known for their stretcher bond as the wall is plastered at both sides. Raw materials are used to make this wall, which makes it economical. TYPES : INTRODUCTION : PLAIN BRICK PARTITION WALLS. REINFORCED BRICK PARTITION WALLS. HOLLOW & CLAY BRICK PARTITION WALLS. PLAIN BRICK PARTITION WALLS : Plain brick partitions are usually half brick thick. The bricks are laid as stretchers , in cement mortar. Vertical joints are staggered alternate blocks The wall is plastered on both the sides. The wall is considerably strong and fire resistant. Thickness of plain brick partition wall is  10cm or half a brick .

3. 1.BRICK: Second Class Brick is Often used to construct Half Brick Partition Walls . The size is standard, color is uniform yellow or red. It is well burnt , slightly over burnt is acceptable. It has a regular shape ; efflorescence is not appreciable. It emits a metallic sound when struck by another similar brick or struck by a hammer. The standard Size of Brick in mm is 190 x 90 x 90 mm (Length x Width X Thickness). 2.MORTAR: Cement mortar used for Half Brick Partition Wall. Cement mortar is a homogenous paste of cement, sand and water and little lime to make plastic. Cement mortar ratio of 1:4 ( 1 Part of Cement mixed with 4 Part of Sand) . Cement mortar ratio of 1:6 ( 1 Part of Cement mixed with 6 part of Sand). Easily workable. Adequate strength in tension, compression, and bond for the work. Durable. Set quickly so that the speed of construction is ensured. Bind the bricks or stones to give a tight joint through which water cannot penetrate. The joints formed by mortar should not develop cracks , and they should be able to maintain their appearance for quite a long time. MATERIAL USED :

4. BOND USED : A stretcher is the longer face of the brick as seen in the elevation. In stretcher bond masonry all the bricks are arranged in stretcher courses. However care should be taken to break vertical joints. This type of construction is useful for the construction half brick thick partition wall Half brick walls or the partition walls will be measured in Sqm, which will not exceed maximum 155 mm ( (115 mm brick + 15 mm Internal plaster + 25 mm external plaster) A Half Brick Wall has a thickness equal to a brick split halfway along its length. To construct 4.5” wall, it will cost 64 Rs per sq ft in India EXAMPLE:  A Half Brick Wall of Length 12.5 m and Height is 4m, area = 12.5× 4 = 50 sqm. Using thumb rule, half brick wall or singular layer or 4″ brick wall, multiply the length of wall by the height to get area measured in square meter. Multiply that area by 50 to get the number of bricks you should need, then add @10% extra for wastage and breakage during transportation storage and brick wall installation. half brick thick wall = 50 bricks per square meter + extra 10% . MEASUREMENTS : CALCULATION :   number of bricks for half brick wall = Area of wall in sqm × 50 + extra @10%. consider a half brick wall of length 12.5 m and height is 4m, area = 12.5× 4 = 50 sqm number of bricks = (50 × 50) + 10% of (50 × 50) = 2750 no.s, so there are 2750 no.s bricks you will need for 50 square meter of half brick – thick wall.

5. LAYING OF BRICKS : The operation of bricklaying in ordinary general work is as follows : A layer of mortar is spread to cover the full width of the wall for a suitable length of the lower course. The end brick is then laid on it. Each brick is then properly bedded usually with frog up. (Bricks with 10 mm deep frog are to be laid with frogs up and bricks with 20 mm deep frog are usually laid with frog down to save the quantity of mortar.) A half-brick thick wall (or single layer) has a width equal to the width of one brick. The stretcher side (long side of the brick) is exposed as bricks are laid horizontally. This type of wall can be used as an exterior facade and placed over the top of a solid interior wall system for additional stability, or it could be a simple garden wall. Half-Brick walls should not be used for load bearing or structural purposes. Half – brick walls are mainly used for the internal walls of a house. Hall – brick wall uses single bricks lengthwise in Stretcher bond (110 mm as below). USES :

6. LAYING OF BRICKS :

7. PRECAUTIONS : Half-brick walls tend to crack unless care is taken in its construction. Brickwork in half-brick masonry is to be carried out with stretchers in 1 : 5 mortar. In special cases, if it is considered necessary to reinforce the same (as in long lengths of walls) with two 6 mm MS bars provided at every third or fourth course in 20 mm rich cement mortar 1 : 3. Half the mortar joint (10 mm) is first laid and the other half (10 mm) is laid after the reinforcement is placed so that it is fully embedded in the mortar.  These walls are generally plastered with cement plastering 1 : 5 with a thickness of 12 mm. This plastering also adds to the strength If these walls are planned to be stopped at door height (as usually done in the tiled roofs with ceilings), the walls should not be stopped exactly at top of the door level and abruptly left at that level. One layer of bricks should be laid over the door frame and throughout the length of the wall and then only the partition wall should be finished. A top layer of steel in cement mortar is also advisable

8. STEPS INVOLVED IN THE CONSTRUCTION OF HALF BRICK PARTITION WALL : Calculate the number of bricks Right choice of bricks – Second class brick is mostly used Preparation of foundation Marking of guideposts Mixing of mortar Laying of first brick Cut the brick in half for the next row Finishing of wall

9. STEP 1 : CALCULATION OF NO. OF BRICKS STEP 2 : RIGHT CHOICE OF BRICK Second Class Brick is often used for Half Brick Partition Wall Construction. Compressive strength shall not be less than 70kg/cm2 Absorption value between 20-22 percent. They shall have a minimum crushing strength of 70 kg/sq.cm. They shall not absorb water more than 22% by weight after 24 hours immersion in cold water. STEP 3 : PREPARATION OF FOUNDATION One of the most important parts of a brick wall is the foundation. This is the support for your wall, and the trench size will depend on the width and height of the masonry wall. For reference, needed a half a meter deep trench for a brick wall up to one metre in height. check the measurements before digging as a solid trench is essential to prevent the wall from collapsing. Drive wooden stakes to find the optimal height for the bricks in the trench. Spread the stakes two to four feet apart (depending on the length of the wall) and ensure they are completely level. The first row of bricks should sit flush in the foundation Fill the foundation with concrete, making sure to keep it level and fill to the top of the stakes. Leave it to dry for 2 - 3 days.

10. STEP 4 : MARKING OF GUIDEPOSTS After foundation, need to set up gauging rods to ensure the brickwork is consistently level. The easiest way to do this is to get a piece of timber and cut it to the height of the finished wall. Next, mark 65mm lines (if using standard sized bricks) to determine where each row (also known as a course) should be. Make sure these are freestanding and in the ground at either end of the masonry wall. Set up a string line from one gauging rod to the other. This will be for the second row of bricks, as the first string will be sitting in the trench. Make sure the line is straight and level with no sag. STEP 5 : MIXING OF MORTAR Next, mix the mortar on an old damp board as the strength of the wall can depend on mortar mix. The mortar should slip easily from your shovel, although the mixture should be firm enough to hold its shape. Don't let the mortar sit for more than an hour or two. Soak the bricks in water and let them drip dry. This will ensure that they bond correctly with the mortar. Although, make sure that there is no water running off the bricks as it can make the mortar too wet.

11. STEP 6 : LAYING OF FIRST BRICK Once the foundation is dry, it's time to get started! Place mortar on the foundation and make a 'v' shape along the mortar with your trowel. Creating a 'v' shaped trench spreads the mortar out and makes it easier to lay the course. Place the brick in the mortar and press it firmly into place, taking care to make it level Grab the next brick and add mortar to the short edge before placing it down hard up against the first brick. Tap it into place and remove any excess mortar with the trowel. The remaining mortar can be reused as long as it is free from any dirt or debris. Repeat the process for the first course. Check that the bricks are flush using the spirit level. Also, ensure you consistently keep 10mm of mortar between the bricks. Otherwise, the strength of the wall may be compromised.

12. STEP 7 : CUT THE BRICK IN HALF FOR THE NEXT ROW Make sure the string line is set up for this row to know the height need to achieve. Bricks should always be staggered to provide added strength and support. However, a staggered wall means may need to cut a brick in half. Grab the brick and tap firmly in the middle with the pointed end of hammer. the brick should break in half. Place the bolster in the Centre of the brick and tap firmly using the hammer. A crack should start to appear. Hit the bolster hard once more, and the brick should break away cleanly It doesn't need to be an entirely clean cut, as the rough edges can help attach the brick to the mortar

13. STEP 8 : REPEAT THE PROCESS TO BUILD THE BRICK WALL Now it's time for the second course! Start the row by placing the cut brick down on a bed of mortar. Make sure the string line is in the right place, and the brick meets the string. Place the next brick, check that it is flush and continue. Repeat the process until the completion of second course. Continue working the way upward until reach the desired height. Move the string line with each row and continuously check that the wall is level. Don't forget to include the 10mm for mortar!. STEP 9 : FINISHING OF WALL