How to Work-out Sale-able area:

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If  you have  purchased a flat from any builder, you would have noticed that while arriving at the sale able area , the Builder  adds certain % on the carpet area.
This % starts from 30% and can sometimes even reach up to 80% depending upon the location, goodwill  of the Builder , the type of facilities provided in the complex and of course the stature of that city.

This article explains the concept of this addition of certain % over carpet area.

This method is called as loading on the carpet area.
Let us first understand this mechanism of loading.
Consider a flat whose internal dimensions are , let us say: 30’x20′.
The carpet area is therefore : 600 Sqft.

Assuming that the flat has 9″ thick walls on all 4 sides,
The external dimensions shall be:
(20’+0.75’+0.75′)=21.5′
(30’+0.75’+0.75′)=31.5

The built up area thus can be found out as :
21.5 x 31.5= 677.25 Sqft.

Thus you shall appreciate that builder will certainly desire to get paid for the built up area of 677.25 Sqft. which is 12.88% higher than carpet area.
[677.25 -600
= (77.25/600)x100
= 12.88% ]

Now assume the case of 2 neighboring flats which have got a common lobby of
20’x 5=100 Sqft. .
This lobby is shared by both the flats owners.

Since both the flats have the same carpet area , the builder shall have to load  this 100 Sqft.equally on both the flats.

Thus actual area which the builder constructed for the flat under consideration shall be
677.25+ 50= 727.25 Sqft.

Which is 21.2 % above the carpet area.

[727.25 -600 =(127.25/600)x100=21.2% ]

Summary:
Actual built-up which the Builder has to construct always is greater than the carpet area due to the walls, common spaces such as staircase , lobby ,Terrace , Parking ,Garden ,Security etc
.

For this , the builder has to calculate exactly how much extra area has been thus constructed and then distribute this pro rata on  each flat.
This method could be difficult to derive and also quite difficult to explain to the customers.

Instead of this , the builder assumes a standard % and loads this on the carpet area.

Since it is easy to calculate the carpet area from the drawing   or even by taking actual measurements at the site, builders & customers both are comfortable with this arrangement.

Intricacies Simplified

Article 02:
Rev 00 Dated 04.11.2014.
Suppose  together we visit  a construction site .
The RCC slab at the 4th floor is ready for casting tomorrow.
This is how a slab appears prior to casting.
This is how a slab appears prior to casting.

What questions come to your mind ?

1.What kind of materials in what quantity are required for concreting of this slab ?
2.How much time shall be needed to cast this slab ?
3.What are the checks to be done before & during the slab casting ?

Let us see  how do we  solve these questions one by one.

 1.What kind of materials in what quantity are required for concreting of this slab ?

We already know that:

Concrete needs Cement, Sand , Aggregate and water as the basic contents .
Admixtures are also sometimes added depending on specific need.

We already know that the Nominal Mix for Grade M20 concrete is  (1+1.5+3).
:
For 1 CuM of concrete , the material consumption is as follows:

 ,Cement:   {1.52/(1+1.5+3)} X 28.8 Bags = 7.96 Bags

Sand:          {1.52/(1+1.5+3)}X 1.5 =  0.415 CuM
Aggregate: {1.52/(1+1.5+3)}. X 3  =  0.830 CuM

 2.How much time shall be needed to cast this slab ?

The time taken for casting can be derived as follows:
1.Assuming that each batch is mixed for exactly 1 minute ,then in one hour we can mix concrete using  60 bags of cement.

 2.Suppose the slab  needs 300 bags and we are using only 1 mixer , then we shall need 300/60= 5 hrs.

3.Steps for finding the duration:
3.1.Find out cement to be used.
3.2 Decide no of mixers to be deployed.
3.3 Concreting duration:
(No of cement bags/60)(1/No of mixers).

3.What are the checks to be done before the casting is taken up ?

Checks prior to casting:
1.Materials:
Availability of all materials of approved quality in adequate quantity with reasonable lead from the point of mixing.

2.Centering:
2.1 Centering plates to be at required level as per drawing.
2.2All gaps properly closed with either wooden planks, GI strips or Masking tape.
2.3.Iron clamps for the Beam & Slab sides.

3.Reinforcement:
3.1.Cover blocks in position for slab ( 15 mm ) & beams ( 25 mm).
3.2.Chairs in position for the bent up bars.
3.3.Laps of adequate length
( Slab : 60 X bar dia )
3.4. Recording of reinforcements

Curious Construction :

The Prologue:
Rev 00 Dated 18.10.14

While moving around in your neighborhood you invariably come across a plot which is enclosed on all sides with tall iron sheets.There would be a temporary gate  in the front and ,occasionally you can see big trucks plying in & out of this gate.

This is how a construction site appears   from a outside
This is how a construction site appears from a outside

After a few months of  clandestine looking activities, you would observe the columns growing out from the land.

The building is growing gradually to attain great heights in due course.
The building is growing gradually to attain great heights in due course.
The great creation is taking shape in your vicinity .You don’t normally any attention to this .
In a few more months ,you would see a full skeleton of a building standing out in front of you.

The days pass, seasons change and the skeleton gradually meta-morphs itself into a beautiful building.

The marvelous result of toils of entire team of construction
The marvelous result of toils of entire team of construction
After nearly a year or so you would see typical clothes drying out in the balconies, and the  windows getting illuminated during night-time.
So now you realize that the building has started populating .
Welcome to the New occupants. The proud owners of the new property.

This blog aims to share with you in a  simple language, what all takes place during the construction .

It shall keep on answering your basic queries about the construction 

First let us see : Who does what ?

A building is a product of synergy.So many agencies are involved , directly or indirectly , in such a project.Some are  involved physically while others are  involved mentally.

That’s why you would see persons toiling in the scorching sun ,working even during light rains. Some persons at the same time would be doing planning or some design work sitting in air-conditioned chambers.

These people are behind any building : Authorities,Clients, Consultants,Contractors & Suppliers. 

This blog aims to address all queries pertaining to construction
This blog aims to address all queries pertaining to construction

Clients arrange the resources for the construction and engage a Consultant who prepares the  drawings.Clients & consultant together seek various permissions from Authorities to construct the building .Together they  retain a contractor who organizes procurement of  material & deploys the labor.

Contractor studies the drawings, procures materials from material suppliers ,engages Labor contractors and transforms the drawings on paper to an actual building on the land.

Clients either use the buildings themselves or may sell it to customers who then become the occupants of the new building.

Summary:
Vision of the clients is transformed into a drawing by the consultant.
The drawing gets transformed into an actual building through a contractor.

SANTOSH KULKARNI

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