MrLittleFinger1:


Nice job. But your interpretation of the mix ratios seems confusing, or at best, incorrect. Please, revisit.

Which part is confusing? Maybe it's because of the spacing of the sentences there. Its correct bro.

Though for more realistic site material schedule, one or two indices there might be tweaked a bit, depending on the experience of the person doing the calculation.

abeffiom:
Firstly speaking as a qualified QUANTITY SURVEYOR dpc is very different from overs site concrete. Pls let that be noted first. DPC means damp proof course which is asingle shit of water proof running alone the wall. We also have Dpm. Which is damp proof membrain which is put in b/w the floor and held by the wire mesh. Pls dpc ain't oversite concrete. Pls.

Correct.

abeffiom:
Firstly speaking as a qualified QUANTITY SURVEYOR dpc is very different from overs site concrete. Pls let that be noted first. DPC means damp proof course which is asingle shit of water proof running alone the wall. We also have Dpm. Which is damp proof membrain which is put in b/w the floor and held by the wire mesh. Pls dpc ain't oversite concrete. Pls.

it is just a popular among building construction expert to interchanged those two. to me DPC ( damp proof course ) is a combination of a membrane use after filling (with leterite, hard core and sharp sand) and the concrete placed on top of that membrane basically to prevent moisture from rising through the foundation. basically it serve other structural purpose like allowing a uniform building level to be achieved after foundation, it also serve as tie to join the foundation wall together.
the BRC ( British reinforced mesh ) is introduced at the middle to prevent sinking under its own weight and cracking due to internal tension which may developed in the concrete.

summary. DPC = DPM + oversite concrete

I just did this today.
An event centre only on ground floor.
We fixed columns with pads and also ran reinforcement on the wide strip foundation

Pls, how do i get ur contact. I am in ph too. Or how do i meet u? 08059306124. U can send sms or flash.

chimchim1:
Pls, how do i get ur contact. I am in ph too. Or how do i meet u? 08059306124. U can send sms or flash.

ok sir... i will add you up on bbm or whatsapp

abdulwastecx:
i am open to any question

Good to see this thread on front page.

Wish I could have this time to write something like this.

Currently, am handling a project in Imo state (2 bedrooms on d ground flr and a pent flr of 2bedrooms also).

The client initially, based on "his engineer's" advise, payed me off after design. I backed off under agreement.

Now his engineer can't handle the project to my details. He started building based on his assumptions. Where I had cantilever by window side for AC on the pent flr, he thought it was a terrace and added door instead of just window. The building on site is far far different from my drawings. And the client has observed it.

He's been begging me to come and complete the job. I told him that for every week I visit owerri because of that project, he must pay me 65k.

If he agrees, we have a deal.

abdulwastecx:
mix ratio for foundation footing for bungalow should either be 1:3:6 or 1:2:4 for normal soil.
i prefer 1:2:4 ( 1 bag of cement : 4 head pan of sand or 1 wheel barrow of sand : 8 head pan of gravel or 2 wheel barrow of gravel). reason been that the foundation of bungalow is very important because it help to distributes the wall load to foundation adequately.
A typical foundations supporting a three bedroom flat or its equivalent should have the following features

1. minimum thickness of 100mm ( 4'') and should not more than 225mm (9'') thick on a strong soil for economy reason.
2. the sharp sand should not be too smooth and free from clay and other dirt which may reduce the strength of concrete
3. the gravel should be preferably 3/4 ( 20mm) thick and must be free from dust.
4. the water for mixing should be drinkable and free from salt and other chemical contamination
5. the water-cement ratio must not be greater than 0.6.


mode of calculating the volume of concrete for foundation footings ( strip foundation).
1. get the sum of the total gird of the substructure, let say 'P' = 50 ( example)
2. get the width of the foundation, say 450mm (18'') for 150mm ( 6" wall and 675mm ( 27" ) for 225mm (9" wall
3. Assume a thickness of say 150mm for 6" wall and or 225mm for 9" wall.
4. convert all your dimension to 'm'
5. hence volume, v =50x 0.45 x 0.15 = 3.375m3
6. increase the volume by 25% to cater for shrinkage and wastage. =1.25 x 3.375= 4.05m3

using mix ratio 1:2:4
part of cement = 1/7 x4.05 =0.58m3
since the density of ordinary Portland cement s 1506kg/m3
and i bag = 50kg
hence, no of bags = 0.58 x 1506/50 =17.4bags ( 18 bags aprox.)

part of sand = 2/7 x 4.05 =1.16m3
since the density of sharp sand is 1600kg/m3 and a tonne of sharp sand is 1000kg
hence, 1.16 x 1600/1000 = 1.856tonnes ( 2 tonnes aprox.)

part of gravel = 2 x 1.16 = 2.32m3
since the density of gravel is 2400kg/m3 and a tonne of gravel weight 1000kg
hence, 2.32 x 2.4 =5.57tonnes ( 6 tonnes )

part of water using water cement ratio of 0.6
weight of water = 0.6 weight of cement = 0.6 x 18 x 50 =540kg
volume of water required, from density = mass/volume
making volume subject, volume = mass/density
where density of water = 1000kg/m3
hence, volume of water required = 540/1000= 0.54m3
since,1m3 = 1000liters
volume of water required = 540 liters

Job well done bro.
But in your analysis of cement, is cement density 1560kg/m3 or 1440kg/m3? Cos a Lotta estimates go with the later.

Thanks

Op, can you do work in Uyo if contracted

Op good work u have done here. Please don't forget to let us know the challenges u faced while on this project.

COOLDK:



Job well done bro.
But in your analysis of cement, is cement density 1560kg or 1440kg? Cos a Lotta estimates go with the later.

Thanks

density of ordinary portland cement is about 1506kg/m3

Akan:
Op, can you do work in Uyo if contracted

yes sir...

abdulwastecx:


it is just a popular among building construction expert to interchanged those two. to me DPC ( damp proof course ) is a combination of a membrane use after filling (with leterite, hard core and sharp sand) and the concrete placed on top of that membrane basically to prevent moisture from rising through the foundation. basically it serve other structural purpose like allowing a uniform building level to be achieved after foundation, it also serve as tie to join the foundation wall together.
the BRC ( British reinforced mesh ) is sometime introduced at the middle t prevent sinking under its own weight an cracking due to internal tension which may developed in the concrete.

summary. DPC = DPM + oversite concrete

really dunno if this would help, kindly study d pic below,u would clearly c dat d dpc(at the left) is clearly place at the perimeter of the building while the DPM(at the right) is place within d floor area, not withstanding most contractors usually use a polythene Sheet to cover both d floor area and d perimeter of the building

abdulwastecx:
Item 2: Land survey; Land survey is important because it allows the builder/engineer understand the following information;
1. Understand the relative height of the site with respect to an ordinance benched mark already in existence
2. It enable the building line of the building to be known
3. It will also help to control the drainage of the building and the site in future.

Most building owners don't do this item 2 because fear of cost or ignorant but it reality, it is relatively cheap to do.
For a small building project, it cost about N10,000 to rent a theodolite or N20,000 to rent a Total stations for one day and the operator/surveyor/engineer is paid around N10,000 making a sum of N30,000 ( maximum).

Is that cost for an ordinary site plan or a registered survey plan or levelling?
R u a surveyor? If ur answer is no, please don't mislead ppl with dis. Correct it

Ok

pinkbee:

Is that cost for an ordinary site plan or a registered survey plan or levelling?
R u a surveyor? If ur answer is no, please don't mislead ppl with dis. Correct it

Madam... this is relative topic of discussion. I am not a surveyor but building leveling can also be done by a civil engineer ( see engineering surveying), All these quotes here are for relatively small building work of say two bedroom to three bedroom flats.

abdulwastecx:



IT DEPEND ON THE NATURE OF THE SOIL.
FOR 9" BLOCK ON A NORMAL SOIL ( Qu between >|100kN/m2) = 225mm ( 9"
FOR 6" BLOCK ON A NORMAL SOIL = 150mm

I wish i can come over for tutelage.. From ur post, u sound very knowledgeable about this.

abdulwastecx:
mix ratio for foundation footing for bungalow should either be 1:3:6 or 1:2:4 for normal soil.
i prefer 1:2:4 ( 1 bag of cement : 4 head pan of sand or 1 wheel barrow of sand : 8 head pan of gravel or 2 wheel barrow of gravel). reason been that the foundation of bungalow is very important because it help to distributes the wall load to foundation adequately.
A typical foundations supporting a three bedroom flat or its equivalent should have the following features

1. minimum thickness of 100mm ( 4'') and should not more than 225mm (9'') thick on a strong soil for economy reason.
2. the sharp sand should not be too smooth and free from clay and other dirt which may reduce the strength of concrete
3. the gravel should be preferably 3/4 ( 20mm) thick and must be free from dust.
4. the water for mixing should be drinkable and free from salt and other chemical contamination
5. the water-cement ratio must not be greater than 0.6.


mode of calculating the volume of concrete for foundation footings ( strip foundation).
1. get the sum of the total gird of the substructure, let say 'P' = 50 ( example)
2. get the width of the foundation, say 450mm (18'') for 150mm ( 6" wall and 675mm ( 27" ) for 225mm (9" wall
3. Assume a thickness of say 150mm for 6" wall and or 225mm for 9" wall.
4. convert all your dimension to 'm'
5. hence volume, v =50x 0.45 x 0.15 = 3.375m3
6. increase the volume by 25% to cater for shrinkage and wastage. =1.25 x 3.375= 4.05m3

using mix ratio 1:2:4
part of cement = 1/7 x4.05 =0.58m3
since the density of ordinary Portland cement s 1506kg/m3
and i bag = 50kg
hence, no of bags = 0.58 x 1506/50 =17.4bags ( 18 bags aprox.)

part of sand = 2/7 x 4.05 =1.16m3
since the density of sharp sand is 1600kg/m3 and a tonne of sharp sand is 1000kg
hence, 1.16 x 1600/1000 = 1.856tonnes ( 2 tonnes aprox.)

part of gravel = 2 x 1.16 = 2.32m3
since the density of gravel is 2400kg/m3 and a tonne of gravel weight 1000kg
hence, 2.32 x 2.4 =5.57tonnes ( 6 tonnes )

part of water using water cement ratio of 0.6
weight of water = 0.6 weight of cement = 0.6 x 18 x 50 =540kg
volume of water required, from density = mass/volume
making volume subject, volume = mass/density
where density of water = 1000kg/m3
hence, volume of water required = 540/1000= 0.54m3
since,1m3 = 1000liters
volume of water required = 540 liters

Oga, I greet your office sir. That 'P' represents what sir, thank you.

abdulwastecx:


it is just a popular among building construction expert to interchanged those two. to me DPC ( damp proof course ) is a combination of a membrane use after filling (with leterite, hard core and sharp sand) and the concrete placed on top of that membrane basically to prevent moisture from rising through the foundation. basically it serve other structural purpose like allowing a uniform building level to be achieved after foundation, it also serve as tie to join the foundation wall together.
the BRC ( British reinforced mesh ) is introduced at the middle to prevent sinking under its own weight and cracking due to internal tension which may developed in the concrete.

summary. DPC = DPM + oversite concrete

Oga, when shall one apply that DPM (that nylon stuff), is it between hardcore and oversite concrete or before hardcore?

Castos:
Oga, I greet your office sir. That 'P' represents what sir, thank you.

perimeter

Castos:
Oga, when shall one apply that DPM (that nylon stuff), is it between hardcore and oversite concrete or before hardcore?

between hardcore and oversite concrete

abdulwastecx:


between hardcore and oversite concrete

Thank you sir, please after Will the hardcore cover even the foundation wall? And what is the ratio of mix for the hardcore (please state for bungalow and duplex)

Castos:
Thank you sir, please after Will the hardcore cover even the foundation wall? And what is the ratio of mix for the hardcore (please state for bungalow and duplex)

pls can you tell the (estimate) cost of building 3 self content bedroom with sitting room, dinning and kitchen in owerri

mystical10:
pls can you tell the (estimate) cost of building 3 self content bedroom with sitting room, dinning and kitchen in owerri

I don't about Owerri, in Anambra 6-7m call build a decent bungalow of 3bedroom.

Castos:
I don't about Owerri, in Anambra 6-7m call build a decent bungalow of 3bedroom.

ok.

abdulwastecx:
mix ratio for foundation footing for bungalow should either be 1:3:6 or 1:2:4 for normal soil.
i prefer 1:2:4 ( 1 bag of cement : 4 head pan of sand or 1 wheel barrow of sand : 8 head pan of gravel or 2 wheel barrow of gravel). reason been that the foundation of bungalow is very important because it help to distributes the wall load to foundation adequately.
A typical foundations supporting a three bedroom flat or its equivalent should have the following features

1. minimum thickness of 100mm ( 4'') and should not more than 225mm (9'') thick on a strong soil for economy reason.
2. the sharp sand should not be too smooth and free from clay and other dirt which may reduce the strength of concrete
3. the gravel should be preferably 3/4 ( 20mm) thick and must be free from dust.
4. the water for mixing should be drinkable and free from salt and other chemical contamination
5. the water-cement ratio must not be greater than 0.6.


mode of calculating the volume of concrete for foundation footings ( strip foundation).
1. get the sum of the total gird of the substructure, let say 'P' = 50 ( example)
2. get the width of the foundation, say 450mm (18'') for 150mm ( 6" wall and 675mm ( 27" ) for 225mm (9" wall
3. Assume a thickness of say 150mm for 6" wall and or 225mm for 9" wall.
4. convert all your dimension to 'm'
5. hence volume, v =50x 0.45 x 0.15 = 3.375m3
6. increase the volume by 25% to cater for shrinkage and wastage. =1.25 x 3.375= 4.05m3

using mix ratio 1:2:4
part of cement = 1/7 x4.05 =0.58m3
since the density of ordinary Portland cement s 1506kg/m3
and i bag = 50kg
hence, no of bags = 0.58 x 1506/50 =17.4bags ( 18 bags aprox.)

part of sand = 2/7 x 4.05 =1.16m3
since the density of sharp sand is 1600kg/m3 and a tonne of sharp sand is 1000kg
hence, 1.16 x 1600/1000 = 1.856tonnes ( 2 tonnes aprox.)

part of gravel = 2 x 1.16 = 2.32m3
since the density of gravel is 2400kg/m3 and a tonne of gravel weight 1000kg
hence, 2.32 x 2.4 =5.57tonnes ( 6 tonnes )

part of water using water cement ratio of 0.6
weight of water = 0.6 weight of cement = 0.6 x 18 x 50 =540kg
volume of water required, from density = mass/volume
making volume subject, volume = mass/density
where density of water = 1000kg/m3
hence, volume of water required = 540/1000= 0.54m3
since,1m3 = 1000liters
volume of water required = 540 liters

I disagree with the mix ratio u explained here. The 1:3:6 is used for mass concrete n the 1:2:4 is for reinforced concrete. Pls try n verify n apply corrections too.

temmy6996:
I disagree with the mix ratio u explained here. The 1:3:6 is used for mass concrete n the 1:2:4 is for reinforced concrete. Pls try n verify n apply corrections too.

1: 3: 6 is weaker than 1: 2: 4 or 1: 2: 4 is stronger than 1: 3: 6, The difference between the two is just the cement content and the ratio of aggregates.

we are talking about a bungalow where the load on the structure are not that critical, hence a well placed concrete of 1: 3: 6 will do the work sufficiently.

The problem now is we don't even follow these ratios because of inadequate concrete production mechanism like batching plant.

Pls send this breakdown analysis to my email taiwo@doctor.com

Castos:
Thank you sir, please after Will the hardcore cover even the foundation wall? And what is the ratio of mix for the hardcore (please state for bungalow and duplex)

hardcore is not a concrete but is the material put under floor . It is used as a sub base after building the foundation wall to make up levels before casting the ground floor oversite concrete of DPC.
The recommended type of material for hardcore
is hard stone ballast or quarry waste that is retained on a 150mm BS sieve .
Care should be taken
to ensure that the hardcore is free of weeds, roots, vegetable soil,
clay, black cotton soil or other unsuitable materials. Broken stones
or brick and waste concrete from a demolished structure can also be used as hardcore

Castos:
Thank you sir, please after Will the hardcore cover even the foundation wall? And what is the ratio of mix for the hardcore (please state for bungalow and duplex)

hardcore is not a concrete but is the material put under floor . It is used as a sub base after building the foundation wall to make up levels before casting the ground floor oversite concrete or DPC.
The recommended type of material for hardcore
is hard stone ballast or quarry waste that is retained on a 150mm BS sieve .
Care should be taken
to ensure that the hardcore is free of weeds, roots, vegetable soil,
clay, black cotton soil or other unsuitable materials. Broken stones
or brick and waste concrete from a demolished structure can also be used as hardcore

mystical10:
pls can you tell the (estimate) cost of building 3 self content bedroom with sitting room, dinning and kitchen in owerri

send the drawing to my mail so i can help with the estimates