NewStats: 3,263,743 , 8,181,216 topics. Date: Saturday, 07 June 2025 at 04:28 PM 332v2j

sule4:

Abdul, is there any setback to the structure if I wait till after roofing, plumbing and electrical work before doing the oversite concrete job

Always better to do it before super structure ( wall ontop of the foundation) because it help to create a uniform level after the foundation in other to receive the super structure block wall, with a properly spread membrane ( polystyrene) it help prevent moisture from rising through the block wall which may spoil painting and plastering in the super structural wal

Can one use pieces of blocks and concrete from a demolished house to fill the foundation..instead of latterite

jfkenny:
Can one use pieces of blocks and concrete from a demolished house to fill the foundation..instead of latterite

yes sir, provided it is properly compacted

Booking a seat already.

abdulwastecx:
I will start by enumerating the steps that need to be followed why building a bungalows foundation from structural points of view and also considering cost.

1. Site clearance
2. transverse survey and the leveling of the site by a land survey or a civil engineer using either total station or theodolite
3. the setting out of the building
4. Excavation of foundation trenches
5. Foundation footings( popularly called blinding).
6. Setting of foundation if any in the case of pad footing, combine or continues foundation
7. setting of foundation wall or substructures wall.
8. filling of the foundation
9. preparation of the filled foundation for DPC by compaction
10. Formwork for DPC
11. Placement of oversite concrete on the prepared foundation.

Brilliant. But u forgot a very important aspect. Site survey. Nature of soil. It determines the type of foundation to be required.

abdulwastecx, pls i need an advice on foundation and decking costing...

in portharcourt, a storey building measuring 20,000mm by 10,000mm. like how much by rough estimate should the foundation and decking cost?

thank you, abdulwastexc

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following and learning .....



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abdulwastecx:


setting out = 40k
excavation = 80 - 100k ( with a depth of 600mm and width of 450 or 675mm)
blinding concrete = 250k ( assuming 15k/cubic meter)
block work blocks both materials and workmanship= 500K
some foundation side columns = 80k
filling = base on site condition
dpc of 100mm thick (4" = 350k

TOTAL WITHOUT SUPERVISION FEE AND FILLING = 1.35m ( for a very solid job)

Thanks for this response. U are a gift to humanity. God bless u.

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.

I like it ,will lov to hav ur

abdulwastecx:
i am open to any question

good job...
que..
do u actually need d BRC for a bungalow floor slab..?

abdulwastecx:
Item 3. setting out : setting involve the transferring of information on the structural drawings, architectural drawings and servicing drawings into the ground for construction of a house to be possible.

Setting out can also be done using the following two method:
1. It can be done manually
2. It can also be done using surveyors instrument like total station or a theodolite.

For most bungalow with dimension of building less than 20m in both width and length, manual method can safely be use.
materials for a typical setting out
1. peg
2. Line
3. profile board ( 2 x 2'' soft wood)
4. nail ( 3'', 2'' and 11/2'' nail)
5. Builder's square, plumb, meters rule, tabe etc.

How to estimate materials for setting out
to get number of pegs required;
1. Get the perimeter of the building.
2. increase the perimeter by 25%
3. divide the perimeter by 2 ( i normally spaced my pegs @ 2m c/c)
4. since there are 20 pegs in a bundle and a bundle cost about N1,200. the result from 3 above is further divided by 20 to get the number of bundle and the result is multiply by N1,200 to know the cost of peg.


to get number of profile board ( 2 x 2'' soft wood)
1. using the result of 2 above, divide the result by 3m ( since 2 x 2 comes in 3.6m )
2. since each 2 x 2'' soft wood cost about N200, multiply the result in above by N200 to get the cost of profile.

in summary, it cost about N40,000 for materials and workmanship to set out a typical three bedroom flat bungalow


a typical profile board

Interesting and informative!

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.

..lolzz..
yes..u are very right sir....
a lot of ppl get confuse and mix every thing up....
Only professionals get it right. ..

So, lyk hw much is d total cost of layin d foundation

@OP ... Good work .

However, I, for one, I don't take engineering theory serious. Out there in the field, before you will finish this epistle, an informally educated mason ( brick layer) cum contractor would give you a structurally sound, standing and lasting building. I doff my hat for the informally educated brick layers cum contractors in the building sector. This is my experience and opinion, therefore I don't owe anyone an apology .

Weldone bro

Pls sir can you do me a favour, can you pls send this whole package to my e-mail really need to understand this rudiment before embarking on my own project, pls sir to [email protected]...... Thanks

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 ing 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

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

I really appreciate this analysis, thanks

I don't know why I dont like reading again ?

Put this lecture inside DVD and see me watching it..

just in time... doing my fence monday.... i so appreciate this...

Dis is real educative and gud at dis point for pple like us who have been nursing d †ђξ ambition of starting smtin small like dis. Pls I wld like if I can get d break down in ma mail. [email protected]

I love this

MrLittleFinger1:


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

My friend i don't see anything ambiguous my explanation above. when i say 1:2:4 means one bag of cement to four head pan of sharp sand and eight head pan of gravel/granite, i am saying that by assuming that a bag of cement is equivalent to two head pan of cement ( which is practically accurate )