Simple process to calculate shuttering materials for footing

There are various types of formwork materials can be used for footings. You can use plywood, wooden plank or even steel shutter.

Mostly used shutter materials for footing is wooden planks, plywood or wooden board as those are cheap and widely available.

How to Easily Estimate Shuttering Materials for Footing

There are different types of footings in a building. But, all the footings are different. There should be equivalent types of footings. Initially, it is required to summarize the similar type of footings.

Summarizing footings - Generally, the footings are demarcated as F1, F2, F3… etc.

Presume, there are 10 numbers of F1 type footing, 6 numbers of F2 type footing, and 8 numbers of F3 type footing, etc.

Summarize them all. The same types of footings will be summarized based on the footing layout drawing sheet. It is accessible in the structural drawing book.

Once the counting is done for all types of footings, verify the footing layout drawing to find out whether any footing remains unmarked. If there is any, count it also.

Once this step is completed, you’ll get the numbers of all types of footing.

Now, the total number of footings should be counted in the footing layout drawing by marking individually with the pencil.

It is not necessary, to create formwork for all the footings. As for instance, there are 10 numbers of F1 type footings. The sizes of all these footing are equivalent. If you only create one formwork for this type, that can be used again for all 10 footings. In this way, the cost will be saved significantly.

To reduce the cost, it is recommended to utilize wooden shutter materials for footing instead of steel shutter for footings.

Given below, the detail method to measure wooden shutters materials for the footing of a building project.

Step 1: Work out the Periphery Length of Footing.

Assume, the size of the F1 footing is, 4′ x 6′ x 1′.
Therefore, the periphery length of this footing will be as follow :-
= (4′+6′) x 2
= 20′
Step 2: Work out The Periphery Area of The Footing
The periphery area of the F1 footing is,

=20′ x 1′ (the height of the footing is taken as 1′)
= 20 square feet (sft)

Step 3: Workout Shuttering Materials

Wooden plank or plywood : The periphery area of the F1 footing is actually required area of wooden plank or plywood that is 20 square feet. It is required to include 5% extra while giving order for wooden plank or plywood. Therefore, necessary wooden plank or plywood for our footing is, 21 sft.

Wooden batten: Usually, 3″x 2″ wooden batten for the formwork of footings is utilized. To make the process simple for calculating wooden batten, just use a thumb rule that is 2 rft (running feet) per shuttering area. So, required wooden batten for the footing will be as follow :-

= 2 x 21
= 42 rft (running feet)

Nail: Similarly, to calculate nail for formwork, just use a thumb rule that is 0.02 kg for one square foot of shuttering area.

Therefore, the required nail for our example footing is,
=0.02 x 21
=0.42 kg (kilogram).

So, the necessary shuttering materials for one formwork of F1 type footing are obtained. Depending on how many formworks will be required for F1 type footing, multiply the shuttering materials with that number.

As for instance, if there are 10 numbers of F1 type footing and it is necessary to create 3 numbers of formwork for this type footing, required shuttering materials for 3 numbers of formwork for F1 type footings will be as follow:-

• Wooden plank or plywood = 3 x 21 = 63 sft
• Wooden batten (3″x2″) = 3 x 42 = 126 rft
• Nail = 0.42 x 3 = 1.26 kg.

In the same way, work out the shuttering materials for all several types of footing for your building project and summarize them all.



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Published By
Rajib Dey
www.constructioncost.co
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Some best formwork methods

Formwork means the temporary or permanent molds which are applied to retain wet concrete unless it gets cured. It is a vital component in concrete construction as without formwork the schedule, labor requirements, quality and total cost of a project are significantly impacted.

In due course of time, formwork molds have changed from conventional job-built timber to pre-engineered systems comprising of a combination of steel, aluminum, manufactured timber, plywood and plastics.

These improvements in formwork molds make the jobsite production & safety better, with fewer labor, whereas creating a superior finished product.

Walls—Now-a-days, steel-framed, wood-faced panels, which need consumable ties at 2-feet-on-center and one connection per square foot, are extensively used for handset wall forming. These are substituted with larger, two-person handset systems which need less labor and get rid of consumable purchases due to reusable taper ties.

In recent times, clamp connection forms having wood or plastic form faces that offer tremendous labor savings in assembly, are utilized. Assembly and reconfiguration of these standard systems to satisfy changeable structure dimension takes place instantly, and also offers a consistent concrete finish.

Slabs—The application of fixed or tailor-made wood posts, stringers and joists is still considered as the most common method of shoring of slabs. This method delivers from generation to generation and considerable labor is required for that. Since, the posts are arranged as close as 2-feet-on-center, construction sites turn out to be very congested.

A new construction method that highlights engineered lumber and metal posts raise the post spacing up to 5 feet by 10 feet and suggests components which are systematic and can be reprocessed. This increases spacing and facilitates less material on site to develop the same slab area. Less material leads to lowered handling requirements, less labor to arrange and strip the formwork, fewer transport costs, and an improve overall job site productivity.

The existing method for gang-forming slabs applied trusses or structural decks based on significant amount of time for assembly and disassembly. Besides, this method requires a huge amount of crane time, thus accelerating the time for resetting a suitable operating method. The customer should also purchase the plywood facing and often restore it several times on the same project.

Gang-forming slabs are commonly found on the structures with height in excess of 15 stories with the purpose of reducing cost. To provide a greater solution to these types of systems, smaller tables are arranged to the job site fully assembled with plywood especially for mid-rise buildings where gang-forming was not inexpensive earlier.

The formwork-lifting elevators affixed to the exterior of a building that facilitates all formwork to be cycled from floor to floor devoid of requiring a crane to decrease job site crane time & formwork labor requirements. These table-lifting systems are applied along with the smaller table method and also allow for other construction material like handset shoring, vertical formwork and reshores from below to cycle from floor to floor with a crane.

How to choose the exact formwork

Structural engineers should be aware that concrete contractors carry out a detailed analysis of available formwork solutions to arrange the best system for the construction project since conditions differ for each individual project, there is no simple formula for the selection of the proper formwork supplier or system.

Generally, formwork should include 40- to 60-percent of the total cost of a building’s structural concrete frame. For concrete walls, the cost remains 50- to 60-percent range. These percentages involve the cost of material and labor, with the largest cost being for labor. It is vital to analyze the labor costs comprehensively since it is the higher expenditure and is that amount is decreased, it offers superior effect on the bottom line.

To provide the most effective solution for a project, a contractor will calculate different forming systems. Since the scarcity of available and capable labor continues, it has become even more important to opt for proper forming system. So, there are two options for a contractor - a low-priced forming material that is labor-intensive or a forming system that is costly but offer high productivity.

To get more details, go through the following link csengineermag.com



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Published By
Rajib Dey
www.constructioncost.co
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How To Arrange Concrete Subfloor For Laminate Flooring Installation

This construction video offers some useful construction tips on how to perform concrete leveling independently while going to set up laminate flooring.

Laminate floating floors is set up over clean and level ceramic, vinyl, concrete or plywood / OSB subflooring. Laminate flooring is very economical. A laminate floor belongs to a "floating floor," i.e. it is not affixed directly to the subfloor. It is set up over any other firmly stuck flooring, making it perfect for retrofits.

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Published By

Rajib Dey

www.constructioncost.co

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