**Readers,**

**When I was standing in a car park , waiting for someone to complete the shopping , **

**I got a Whatsapp message from one of my students , asking me for the Rubble masonry rates. He said he wanted to submit the quotation on the same day. There was no use of just giving him a rate which I remember because it has to match with the material and labour rates and profit margin expected by this person.**

**So , I had to make a rate analysis for the Rubble masonry .**

**I asked him to message me the basic rates which he promptly did.**

**I next 15 minutes , I completed the rate analysis and send back the entire analysis to him .**

**Thought I shall also share the same calculations with you for your quick reference.**

** **

__Part A : The data :__**Cement: 300/bag **

**Aggregate: 2400/brass **

**Rubble : 1500/brass **

**Labour :2000/brass **

**Sand 5500/ brass**

**You already know that : I brass = 100 Cft**

**Desired Profit 25%**

** **

**Specifications :**

**Rubble masonry Width 18″**

**for wall compound ht 3′ from ground level**

** in cement mortar in ratio : ( 1:6 )**

** **

**Material for 1 cum:**

**Cement : 300*(0.45*1.52*28.8)/7= Rs.844**

**Sand: 5500*0.3529*6*(0.45*1.52)/7= Rs.1138**

**Rubble: 2400*0.3529*1.25 = Rs.1058**

**Labour : 2000*0.3529= Rs.706**

** **

**Total: Rs.3756**

**Profit:Add@ 25%: Rs.937**

** Total: Rs.4693 Rs/cum.**

**Or Rs.133 per Cft.**

** **

**PCC 1:4:8**

**Material for 1 cum:**

**Cement : 300*(1.52*28.8)/13 = Rs.1010**

**Sand: 5500*0.3529*4*1.52/13 =Rs.908**

**Aggregate: 2400*0.3529*8*1.52/13 = Rs.792**

** ****Sub total: Rs. 2710**

**For Labour Add 40% Rs.1084**

**Total : Rs. 3794**

**Profits Add25% Rs.949**

**Total : Rs. 4743 per Cum**

**Rs. 134 per Cft.**

** **** **

**Note :**

**1.You shall observe that the rate for Rubble masonry in cement mortar in CM 1 :6 and the rate for plain cement concrete in proportion 1:4:8 are almost equal**

2. The material wastage is a point on which I need to elaborate.

**As such when we consider the factor 1.52 in the material calculations by dry mix method, we are already considering 2 % material wastage . In case you want a higher allowance for wastage , you may take the factor as 1.57 so that material wastage is 7%.**

Where the material wastage cost considered? Inside 25%?

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Hello ,

Thank you so much for your detailed perusal of the post.

Now I have added a note no 02 which clarifies my view on the wastage factor.

I have considered 2 & wastage in the cement, sand and aggregates .

This is taken in the factor of 1.52 ( In calculations for material constant ).

I am glad that you have taken time to seek my view on the wastage.

Do keep writing .

I am also sure that you would also like to follow this blog so that you get timely updates on the blog.

Thank you once again ,

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I don’t understand about the factor 0.3529 . what is this ???

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Hello ,

Thanks for this query.

The quantities for sand and Aggregate as per the formula is in CuM.

But on site ,in India, we buy the sand & aggregate in Brass [ 100 Cft ],

therefore , it is necessary that these sand & Aggregate quantities are converted into Brass.

Thus , I have included this factor of 0.3529 in the formula itself so that we directly get sand & Aggregate in Brass.

Hope this is quite clear to you.

1 CuM = 35.29 Cft.

1 Brass = 100 Cft.

Therefore , to express 1 CuM in brass ,

we need to multiply CuM by 35.29/100 = 0.3529 .

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(0.45*1.52*28.8)/7

I don’t understand this factor

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28.8 means 1m3 of cement in 50kg bags

1m3 cement=1440 kg

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TRUE

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First of all thank you Kulkarni sir for this elaborate explanation, I just happen to read you post when i was searching for cost of per cubic feet of CRS wall for my residential house in Secunderabad. My builder had quoted me a price and i wanted to ascertain the actual cost in the market. If you have time and would not think otherwise can you please guide me on the price which has been given to me by builder, I am building a G+2 house with 3842 sft of construction. Regards Ashok

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First of thanks for such a useful explanation.

What does 1.25 factor means in case of rubble ?

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This factor of 25 % means that when we have to build 1 Cum of rubble masonry , we need to take 1.25 Cum of loose rubble.

So that it becomes 1 cum after building.

Or you can say we have assumed 25 % voids in rubble.

Hope this is understood now.

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What does factor 1.25 means and how it comes ?

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This factor of 25 % means that when we have to build 1 Cum of rubble masonry , we need to take 1.25 Cum of loose rubble.

So that it becomes 1 cum after building.

Or you can say we have assumed 25 % voids in rubble.

Hope this is understood now.

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1 is 1 CUM and 0.25 is dry Material and Wastage

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If you are referring to rubble ,

I have considered 25 % voids .

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(0.450*1.52*28.8)/7 this factor not understanding

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1 unit= how many m3? for random rubble stone

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Thanks for elucidated explanation for masonary 1:6.

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Excuse me respected sir,

sir isn’t the factor of dry volume for mortar 1.33 instead of 1.52. It’s just a doubt as I am just now reading quantity surveying in college.

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And why is the height not being considered anywhere?

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