Hello everyone,
I will need your help in helping to analyse what quantity of materials I will need to build a twins flat of 3 bedrooms of the size in the file below in terms of quantity of blocks, cement, sand, rods (12mm), rings, binding wire, granite I will need to do my foundation about 3-4 coaches, german floor 4 inch thickness, and the superstructure from german floor to level (2 blocks after). The structure will have 15 pillars. what about labor for welder, carpenter, and mason? The site is in Ibadan, soil strong and land, table flat. Thank you for helping with your expertise. I will post a quote I got soon.

I recently got the quote below for all the works from foundation to level. please help scritinize it. Thank you all.

micbjrex:
Hello everyone,
I will need your help in helping to analyse what quantity of materials I will need to build a twins flat of 3 bedrooms of the size in the file below in terms of quantity of blocks, cement, sand, rods (12mm), rings, binding wire, granite I will need to do my foundation about 3-4 coaches, german floor 4 inch thickness, and the superstructure from german floor to level (2 blocks after). The structure will have 15 pillars. what about labor for welder, carpenter, and mason? The site is in Ibadan, soil strong and land, table flat. Thank you for helping with your expertise. I will post a quote I got soon.

Where in Ibadan are you located?
Call me, let's talk. My contacts are in my signature.

you should be able to get it done at a cheaper cost from the materials to the cost of labour

micbjrex:
Hello everyone,
I will need your help in helping to analyse what quantity of materials I will need to build a twins flat of 3 bedrooms of the size in the file below in terms of quantity of blocks, cement, sand, rods (12mm), rings, binding wire, granite I will need to do my foundation about 3-4 coaches, german floor 4 inch thickness, and the superstructure from german floor to level (2 blocks after). The structure will have 15 pillars. what about labor for welder, carpenter, and mason? The site is in Ibadan, soil strong and land, table flat. Thank you for helping with your expertise. I will post a quote I got soon.

I like this plan.

I salute you for not doing "all ensuite" but I would adjust the layout so that the balcony is on either end for privacy instead of next to each other.

@seunlayi....thank you...but how cheaper can I go in terms of materials and labor?
@CityNG...Thank you. where can I place the balcony on the plan?

@CityNG. Thank you. So I can put the balcony on either end. But please help check the quote. Is it reasonable?

micbjrex:
Hello everyone,
I will need your help in helping to analyse what quantity of materials I will need to build a twins flat of 3 bedrooms of the size in the file below in terms of quantity of blocks, cement, sand, rods (12mm), rings, binding wire, granite I will need to do my foundation about 3-4 coaches, german floor 4 inch thickness, and the superstructure from german floor to level (2 blocks after). The structure will have 15 pillars. what about labor for welder, carpenter, and mason? The site is in Ibadan, soil strong and land, table flat. Thank you for helping with your expertise. I will post a quote I got soon.

Note the following:
you need to placed an expansion joint between the two flat. you can do that by building two wall at the boundary between the two flat an give 50mm allowance.

for a bungalow you don't necessarily need that much columns ( pillars)

@abdulwastecx...thank you...your suggestion is well noted. So how many pillars will be okay for a bungalow of size 21.425m x 11.525m? Also please help me scrutinize the quote.

summary of cost
foundation
setting out = #30k
assuming perimeter = 180m
excavation @ N300/m = N 54k

strip footing for sub structural wall
volume of concrete = 180 x 0.675 x 0. 1 = 12.15m3
concrete of mix 1: 3: 6 cost about N12k/m3
= N145.8k

foundation wall of 3 courses
180 x 0.675 x10 = 1400blocks
@ rate of N130/9" block and Workmanship of N40/block ( °assuming counting work)
1400×180 = N250k
cements and sound for mortal joint bags of 20bags of cement = N40k
sharp sand = N15k
sum for foundation wall = N305k

DPC
polystyrene material = 10k
oversite concrete = 0.075 x 200 = 15m3
cement required = 65bags = N130k
sand 30 tonnes of sand = N30k
15 tonnes of gravel = N60k ( in south west)
workmanship for casting = 50k
formwork = N20k
sum of dpc = N250k

foundation sum
250
305
146
54
30
= N 539k minus contingency and professional charges

ASSUMPTIONS INLUDE THE FOLLOWING
LENGHT OF BUILDING = 18m
width of building = 9m
depth of footing = 100mm (5"
depth of foundation = 675mm (27"
thickness of dpc = 75mm ( 3"

micbjrex:
@CityNG. Thank you. So I can put the balcony on either end. But please help check the quote. Is it reasonable?

I have no direct idea on costs as I haven't started to build yet.

For the balcony check with your architect. I just know that it would be bad if one neighbor is a smoker who goes to his balcony to smoke when the other neighbor is trying to get away from the inside at the same time.

micbjrex:
@abdulwastecx...thank you...your suggestion is well noted. So how many pillars will be okay for a bungalow of size 21.425m x 11.525m? Also please help me scrutinize the quote.

you don't necessarily need column in a bungalow. you only introduce columns when soil bearing capacity is very poor or when the building is very long.

for the sketch above, 6 columns of dimensios 225 x 225mm with column basee of 600 x 600mm. with Y12 reinforcement, 4Y12 in columns and 4y12 both way of the pad

Thank you for the analysis. I tried to ask the mason how he will do the DPC with 30 bags of cement. He said the dpc will be 4 inch thick and will use 4 trips of 5 ton sand (20 tons) and 2 trips of 5 ton gravel/granite (10 tons). Assuming 30 bags, how many trips of sand and granite will i need for dpc?
For casting of foundation, if 20 bags..how many trips of sand and granite is needed?
For 8 pillars, beams, baskets, lintels, how many trips of sand and granite is needed?
For setting 5500 blocks, how many trips of sand and granite is needed?

Thank you

abdulwastecx:


you don't necessarily need column in a bungalow. you only introduce columns when soil bearing capacity is very poor or when the building is very long.

for the sketch above, 6 columns of dimensios 225 x 225mm with column basee of 600 x 600mm. with Y12 reinforcement, 4Y12 in columns and 4y12 both way of the pad

Please rewrite this in plain English for the students in class

micbjrex:
Thank you for the analysis. I tried to ask the mason how he will do the DPC with 30 bags of cement. He said the dpc will be 4 inch thick and will use 4 trips of 5 ton sand (20 tons) and 2 trips of 5 ton gravel/granite (10 tons). Assuming 30 bags, how many trips of sand and granite will i need for dpc?
For casting of foundation, if 20 bags..how many trips of sand and granite is needed?
For 8 pillars, beams, baskets, lintels, how many trips of sand and granite is needed?
For setting 5500 blocks, how many trips of sand and granite is needed?

Thank you

thickness = 100mm (4"
Area of foundation = 11.5 × 21.5 = 257.5square m
volume = 0.1 × 257.5 = 25.75cubic meters
allowance for wastage etc = 1.25 × 25.75 = 32m3

assuming mix ratio of 1:3:6c
part of cement = 1/10 × 32 = 3.2; cubic meters of bags cement = 3.2 × 1506/50 = 97bags of cement

tonnes of sand with density of 1600kg/m3
sand = 3/10 × 32×1600/1000 = 15.35 tonnes of sand
tonnes of gravel with density of 2400kg/m3
gravel = 6/10 × 32 × 2400/1000 = 46 tonnes

your mason actually underestimate the quantity of materials

micbjrex:
Thank you for the analysis. I tried to ask the mason how he will do the DPC with 30 bags of cement. He said the dpc will be 4 inch thick and will use 4 trips of 5 ton sand (20 tons) and 2 trips of 5 ton gravel/granite (10 tons). Assuming 30 bags, how many trips of sand and granite will i need for dpc?
For casting of foundation, if 20 bags..how many trips of sand and granite is needed?
For 8 pillars, beams, baskets, lintels, how many trips of sand and granite is needed?
For setting 5500 blocks, how many trips of sand and granite is needed?

Thank you

you actually need
97bags of cement
15tonnes of sand
46tonnes of gravel

using 30bags of cement will render the concrete very poor in strength.

my advice is to use a thinner dpc of say 75mm (3"
40bags of cement
30tonnes of sand
15tonnes of gravel ( since gravel is more expensive and dpc is not that structural relevant )

micbjrex:
Thank you for the analysis. I tried to ask the mason how he will do the DPC with 30 bags of cement. He said the dpc will be 4 inch thick and will use 4 trips of 5 ton sand (20 tons) and 2 trips of 5 ton gravel/granite (10 tons). Assuming 30 bags, how many trips of sand and granite will i need for dpc?
For casting of foundation, if 20 bags..how many trips of sand and granite is needed?
For 8 pillars, beams, baskets, lintels, how many trips of sand and granite is needed?
For setting 5500 blocks, how many trips of sand and granite is needed?

Thank you

using mix 1:3:6, for every 1bag of cement, you need 0.17tonnes of sand and 0.48tonnes of gravel.

for 20bags for the foundation:
sand = 20 × 0.17 = 3.4tonnes
gravel = 20 × 0.48 = 9.6tonnes

I'm of the opinion that compromise shouldn't be made here since the foundation is very important structurally.

I'm also of the opinion that a minimum of mix 1:3:6 should be use

Thank you sir. What about setting of 5000 to 5500 blocks for structure? 6 Pillars and all lintels? Blinding? How many cement, sand and gravel needed? Thank you

CityNG:


Please rewrite this in plain English for the students in class

Lemme simplify it here for my oga at the top.
4Y12 rods are specifications of reinforcement rods detailing the yield strength and the diameter which in this case is 12mm. 225mm x225mm details thickness of column in which case its locally called 9inch column. At the base, the column expands to 600mm x 600mm. I assume he made that expansion to spread mass/load of the column to the ground.

From the plan view, I see 'ground floor plan' my question now is, OP are you building a suspended floor designed (duplex/decking) or you're doing a bungalow?

You said your soil is table flat and hard. If its bungalow, I see excessive column specified here.
If its a suspended floor design, I'd advice you do test to really determine the carrying capacity of the soil not just assume from observation of an inexperienced eyes.

CityNG:


Please rewrite this in plain English for the students in class

I mean for a bungalow with load bearing partition walls whose wall is supported on a strip footing, column are not necessary. you only introduce column at the junction of the house, where wall span more than four meter without any perpendicular wall etc.

if need arises for column, the column should be limited to the edges of the building.
most cases the column dimension should be 9" x 9" and the pad foundation supporting the column can be 2' × 2'.

Note for a poorer soil with low bearing capacity and settlement rate ( consult a geotechnical lab)
a structural engineer should be consulted to design the foundation and supporting columns. people hardly do structural design for bungalow though.

see sketch bellow

micbjrex:
I recently got the quote below for all the works from foundation to level. please help scritinize it. Thank you all.

Chief, from your uploaded quotation, your guy said "dpc to decking" are you doing storey building? If yes, discard that guys quotation or else you're gonna end up cutting corners, materials won't be adequate, building will settle (assuming poor foundation due to inadequate use of materials), cracks and map of Ibadan on walls and God forbid, a collapsed structure. If you're not doing a suspended floor, add more materials to give adequate strength to your building. Someone here made an accurate arithmetic of the specifications you needed so go by his specifications for he has given you a good specification.

Hello sirs, I am so much grateful for your help. The building is just a bungalow of 2 nos of 3 bedrooms attached together. No suspended decking. I actually wanted to know if what his quote says is what I need or I will need more. For example, he wants me to budget 5500 blocks and 85 bags of cements to set to them. He said he will set/ chalk on top of each about 50 blocks with a bag of cement.

abdulwastecx:


I mean for a bungalow with load bearing partition walls whose wall is supported on a strip footing, column are not necessary. you only introduce column at the junction of the house, where wall span more than four meter without any perpendicular wall etc.

if need arises for column, the column should be limited to the edges of the building.
most cases the column dimension should be 9" x 9" and the pad foundation supporting the column can be 2' × 2'.

Note for a poorer soil with low bearing capacity and settlement rate ( consult a geotechnical lab)
a structural engineer should be consulted to design the foundation and supporting columns. people hardly do structural design for bungalow though.

see sketch bellow

Thanks Man, very clear now.

lomomike:


Lemme simplify it here for my oga at the top.
4Y12 rods are specifications of reinforcement rods detailing the yield strength and the diameter which in this case is 12mm. 225mm x225mm details thickness of column in which case its locally called 9inch column. At the base, the column expands to 600mm x 600mm. I assume he made that expansion to spread mass/load of the column to the ground.

From the plan view, I see 'ground floor plan' my question now is, OP are you building a suspended floor designed (duplex/decking) or you're doing a bungalow?

You said your soil is table flat and hard. If its bungalow, I see excessive column specified here.
If its a suspended floor design, I'd advice you do test to really determine the carrying capacity of the soil not just assume from observation of an inexperienced eyes.

Thanks Mikey.

Na so I dey learn from you guys.

Let me give you accurate amount...
firstly foundation should be around..1.300 blocks of 130naira each
Hausa to dig the foundation 30k,
you will pay 3 expert brick layer 2500 naira each to do the setting out,(dont use engineer they are as-hole) just promise those bricklayer you will give them the job,
they should be able to finish the digging in a day
mind you,you will buy peg 2 pack of 2000naira each,then nail 500naira and tie rod,like 50 pieces thats 100naira each
soon as the digging is completed,you will negociate with one bricklayer to collect 100k for foundation will fillings,you will tell him you will dig soak away and he will help you to use it to fill it
then you will pay him 40k upfront,you will buy 2 loads of stone sand for the foundation and 2 loads of normal sand,you will need about 25bags of cement for the foundation floor and another 20 to construct the foundation itself ,soon as the foundation is completed,you will pay 60.000 naira for someone to dig soak away for you,2 bigs one and 2 small ones because its 2 flats,then the bricklayer will use the sand they dig out,to fill the foundation
please dont do german floor at this stage since its bongalow

Soon as the fillings are completed, now you have to face the soak away because raining season is around the corner,you will use about 600,block of size 9 for the 2 big soak away and about 120 blocks of size 6 for the small soak away,to cut it short the soak away is going to cost you about 300k
now you have to face the building again,call the bricklayer again,you should negotiate 240k with him to complete the whole bulding,then you have to buy about 4000 blocks about 100 bags of cement,mind you,dont buy it at once or else you will get screwed,they would steal your cement and those people supplying blocks will not supply you accurate number you paid for,you shouldnt have problem until lintel level that is where the expenses starts,then you will buy rough wood,50 pieces of 500 naira each,the capenter should collect about 25k,then you should pay weather about 90k for the iron roads and bending,you have to do the lintel 3 times to avoid buying too much plank,first flat,then second flat,then ark and illers,you will offload another 4 loads of stone sand and 2 loads of normal sands for lintel.

then after the lintel,try to avoid 2 blocks traditional style,add 3 blocks in case you want to do POP in the future
then its time for roofing you will buy
2 by 2 ......250 pieces of 250naira each
2 by 3 ......180 pieces of 330naira each
1 by 12,,,that is facing board...24 pieces of 1500naira each
2 by 4.....130 pieces of 450naira each
3 by 4 .....35..pieces....650 naira
nail......size 4...2 and half bag of 5000 naira EACH
nail size 3 ......2 bags of 4500 naira each
nail size one quater bag of 1200
workmanship should be around 120.000 naira
mind you i have added ceiling logins
normal alluminium for this 2 flats should be around 550k,go to factory by yourself dont collect quotation from those people who call themself factory representatives

let me know if you are interested i will continue
you can use the step above to calculate the cost

@bettercreature. Thank you. Please continue the teaching. I appreciate it. What are d sizes of the soakaways?

The normal size of soakaway is 8ft by 12ft for big ones,and 6ft by 4 fit for the small ones,the big one should be 10 fit deep while the small ones should be about 6ft deep,but most times,the lenght and width of your soakaway depends solely on the size of the available land after the setting out of the main building
Now after the roofing,now come the fencing(you need the fencing at this stage because of plumbing and wiring,because theRE should be some pipes inside the fence to avoid digging of compound floor in the future)but if you are not ready to fence the building,you can start the first phase of plumbing and the installation of electric pipes,tell the technician you want half condit to avoid too much expenses,the first phase of plumbing should cost you about 120k while the first phase of wiring should cost you about 70k,After that,you will need ceiling which should cost you 200k plus for abestos but if its pvc,it should cost you about 120k plus,i mean pvc of 6500 per pack if you really want to go for a cheap one,though i will advice you to go for abestos,now you have to go for floor,you will need about 4 loads of stone sand and 2 loads of normal sand and 40bags of cement,the workmanship should be 80k
after that you will pay weather for buglary windows which should cost about 90k,tell them you want tick pipe as its the best option,then you will pay for window glass which is of 2 types,casement and slidding,casement should cost you about 400k so i will advice you to go for slidding which should cost you about 160k,if its casement,they will install it at once but if its slidding it would be done on 2 phases,first phase is instalation of glass frame which should be 40 percent of the 160k and after plastering you will pay the remaining 60 percent to install the glass,you will need about 70 bags of cement and 5 loads of normal sand to plaster the whole building without the floor,since you will use tiles for the floor,after plastering,then comes the walldrobe which should cost you about 250 for 6 rooms ,every other things depends on your TASTE

bettercreature:
Let me give you accurate amount...
firstly foundation should be around..1.300 blocks of 130naira each
Hausa to dig the foundation 30k,
you will pay 3 expert brick layer 2500 naira each to do the setting out,(dont use engineer they are as-hole) just promise those bricklayer you will give them the job,
they should be able to finish the digging in a day
mind you,you will buy peg 2 pack of 2000naira each,then nail 500naira and tie rod,like 50 pieces thats 100naira each
soon as the digging is completed,you will negociate with one bricklayer to collect 100k for foundation will fillings,you will tell him you will dig soak away and he will help you to use it to fill it
then you will pay him 40k upfront,you will buy 2 loads of stone sand for the foundation and 2 loads of normal sand,you will need about 25bags of cement for the foundation floor and another 20 to construct the foundation itself ,soon as the foundation is completed,you will pay 60.000 naira for someone to dig soak away for you,2 bigs one and 2 small ones because its 2 flats,then the bricklayer will use the sand they dig out,to fill the foundation
please dont do german floor at this stage since its bongalow

it is wrong to assume that engineers are " ass-hole".
though u don't need engineers/builder/architects to set out or build your house but never underestimates the power of professionalism.

build a house that can stand the test of time, get a surveyor or an engineer to do your setting out aat reasonable amount.

profile board setting out requires peg spaced at 2m center to center.
material includes
1.pegs
2. 2 x 2" soft wood

pegs required = perimeter of ur building/2m
= 64/2 = 31 pegs

2 x 2 required = 64/3.3 = 20pieces

buy 3" and 2 " nail of 3 pounds weight

bettercreature:
Let me give you accurate amount...
firstly foundation should be around..1.300 blocks of 130naira each
Hausa to dig the foundation 30k,
you will pay 3 expert brick layer 2500 naira each to do the setting out,(dont use engineer they are as-hole) just promise those bricklayer you will give them the job,
they should be able to finish the digging in a day
mind you,you will buy peg 2 pack of 2000naira each,then nail 500naira and tie rod,like 50 pieces thats 100naira each
soon as the digging is completed,you will negociate with one bricklayer to collect 100k for foundation will fillings,you will tell him you will dig soak away and he will help you to use it to fill it
then you will pay him 40k upfront,you will buy 2 loads of stone sand for the foundation and 2 loads of normal sand,you will need about 25bags of cement for the foundation floor and another 20 to construct the foundation itself ,soon as the foundation is completed,you will pay 60.000 naira for someone to dig soak away for you,2 bigs one and 2 small ones because its 2 flats,then the bricklayer will use the sand they dig out,to fill the foundation
please dont do german floor at this stage since its bongalow

Please explain your reasoning behind the bolded.

Thanks.