The area shall be calculated in sqm correct to two Places of decimal. (ii) Measurement of wall plastering shall be taken between walls or partitions (dimensions before plastering being taken) for length and from top of the floor or skirting to ceiling for height. Depth of cornices or cover, if any, shall be deducted.
Average thickness of a backing coat is 10 to 12 mm thick. If the wall you're plastering is flat and has no cables that need to be buried you may be able to apply a coat of 10mm or less.
The recommended thickness of cement plastering is given below. Recommended thickness of plastering for brick walls is 12 MM, 15 MM or 20 MM.
There are three main Cement Grades from which you can choose. These are Ordinary Portland Cement (OPC), Portland Slag Cement (PSC) and Portland Pozzolana Cement (PPC) available in the market. OPC is available in two grades — 43 and 53. Both grades are considered best for plastering work.
TYPE OF PLASTER
5.1 6 mm thick cement sand plaster Single coat cement-sand plaster with cement-sand mix in proportion of 1:4 shall be carried out over the concrete surfaces. Plastering operations as specified clause no. 4.3 of this.The ideal ratio for a plaster of paris mixture is 2 parts plaster of Paris powder to 1 part water. Measure out the water and pour it into your mixing container.
In making concrete strong, these ingredients should usually be mixed in a ratio of 1:2:3:0.5 to achieve maximum strength. That is 1 part cement, 2 parts sand, 3 parts gravel, and 0.5 part water.
Basically river sand are used for any plastering work. Generally, in any plastering work plasterers are used natural sand, crushed stone sand or crushed gravel sand. Though, there is a grading limit of sand which are used in plastering work. Other types of sand will also work, but it could be more expensive to use.
We normally use the 1:4 ratio of cement and sand in mortar for plastering. That means, one unit cement will be mixed with four units of sand to prepare mortar. We know one bag cement of 50 kilograms contains 1.25 cubic feet of cement.
For general purposes, mix 6 parts sand to 1 part cement. For heavy duty projects, I was taught to mix 4 parts sand to 1 part cement, but recently, I've been mixing 3 parts sand to 1 part cement. The ratio you choose depends on the intended use.
Paving Mortar Mix
For bedding under the slabs use 5 parts sharp sand, 1 part soft sand and 1 cement. For pointing use 4 parts soft sand and 1 part cement. For high traffic areas, a stronger mix of 3 parts soft sand and 1 part cement can be used.For wall plaster generally ratio we use = 1: 6 (1 part of cement and 6 part of sand). For Roof plaster mainly ratio we use = 1: 4 (1 part of cement and 4 part of sand). The thickness of plaster is between = 12 mm to 15 mm. Always use Good quality of cement (Different grades of cement) as well as good quality sand.
Approximately 29 bags are required for 1m3 of cement.
133 LBS per Cubic foot or 3600 LBS a cubic yard, cured mix ratio is approx. 22% cement per weight, so thats 800 LBS, or a qty of 10, 80# bags or 13.3 call it 14 80# bags per meter.
One 50-pound bag of Quikrete Fast Setting Concrete Mix yields about . 375 cubic feet. For example, if you need to cover 33.333 cubic feet, using 60-pound bags of concrete, divide 33.333 cubic feet by . 45 cubic feet to get 74.07 total bags of concrete.
To make 1 cubic metre of concrete you will need: 9,2 bags cement + 0,60 cubic metres sand + 0,60 cubic metres stone. 1.2 small batches: use containers such as buckets, drums or tins. To plaster 100 square metres (15 millimetres thick) you will need: 14 bags cement + 2,25 cubic metres sand.
How to calculate concrete:
- Determine how thick you want the concrete.
- Measure the length and width that you'd like to cover.
- Multiply the length by the width to determine square footage.
- Convert the thickness from inches to feet.
- Multiply the thickness in feet by the square footage to determine cubic feet.
As a rule of thumb 1 of our 25kg bags will cover an area of 0.25m to a recommended depth of 50mm.
To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield. Use the following yields per each bag size: 40 pound bag yields .011 cubic yards. 60 pound bag yields .017 cubic yards.
