₦airaland Forum

Congrats Lalasticlala

Olorun a wo fun wa....... Greet madam oh.

Btw: so you have been doing orza room runs... Kontinue

Babs612000:
please like how much did you spend on the wiring only, if possible list of the wires.

We did surface wiring so it wasn't expensive at all..... Conduit wiring are usually more expensive but I think we still spent close to 400k on tbaf... Including payment to PHCH, pole and related expenses.....

Thanks

Hollar007:
you're highly welcome sir

Hi... quick one on your request.....

flashing - They come in linear meters, so basically all you need is to get the length of the space to be covered in meters and order it. i.e there is no basic calculation needed here, you just measure the length and order.

eave - eaves are external ceiling (technically) - you can follow my thread on how to calculate the numbers of ceiling needed here >> https://www.nairaland.com/4256068/how-calculate-quantity-cost-asbestors#63657921

that covers it...... thanks.

enyiulo:
16rooms hotel how much will it cost to build it

you can only get an accurate response when their is a plan and location

heard his lines just last week and as good as the raps are; the chorus (hooks) are a pure genius.

congrats and make positive impacts

1234jossy:
Hello sir,

Is this building sitting on a half plot of land?

No, on almost a plot... but not up to 1.

Hollar007:
I've been looking for this for a very long time... Really appreciate @saydfact for the post will also beg him to have a similar post of flashing eave angle and others.....It is good to criticize with facts which is very good for we the novice to learn from but... there's also a challenge of others posting their own calculations than discouraging the OP...... Once again thanks for sharing this with us God will continually uplift and enrich your knowledge

THANKS SIR - FOR YOU, I'LL CONSIDER DOING THOSE TUTORIALS....

RIP

HE IS A FREE MAN NOW

https://twitter.com/hashtag/FreeBhadoosky?src=tren&data_id=tweet%3A1050035800732327936

bejick:
I hope you know the roofing sheet come in flat and will be cull-gated.

Kindly educate us,
we're here to learn not argue on who's right or wrong....

You can ignore if the message doesn't appeal to you. NO DISRESPECT PLS.

Str8talk21:
Nice try, but here are the flaws in your calculation:

1. You did not specify what type of roofing material you are adopting for this exercise?
2. you did not give room/allowance for overlapping of these long span roofing sheets which will ultimately change the value of your initial derivative.
3. standard allowance or rule of the thumb for emergence of off-cut is 30%.

I think you can recalculate now.

adanny01:
Thats it.

Thats the flaw i picked.

Different styles of roofing sheet have different overlap dimensions. I actual buying, the whole thing will still be recalculated to take account of lapping.

Secondly, the area method increases waste. The most precise method is the length method. This takes care of cut to use and cut to waste.

The purpose of this thread is to Educate and learn.... Wld be glad if both or anyone of you can teach us those methods....
thanks

adeolu21:
that was the reason the OP said minus accessories in his conclusion. Anyway, it might not work for you if u do have problem with calculations, but it does work for me.

thanks sir - God bless you.. amen

coliboyswag:
this is it

sorry, the roof design can't work on this.
thanks

coliboyswag:
The left and right elevation is longer than the front and back

share the plan - for clarity

follow my latest posy here >> https://www.nairaland.com/4778694/how-practically-calculate-quantity-m2

coliboyswag:
bro pls what if u entrance is facing ur left or right side of ur floor plan can this type of roof gud for it

yes... with proper planning

rhektor:
Eave angles as well as other flashing will consume materials it must also be provided for

Eave, Flashing are not necessarily done with roofing sheets, the topic is on roofing sheets only.... I can decide to use asbestos, pvc etc for the eave so it doesn't apply here.

Thanks - what I omitted are the flashing. ridge cap etc because the thread wld become too long and complex to understand....

my targets are not professionals but those building their individual houses with little resources.

idfact0404:
Nice one, but with ur soft analysis you av to consider some complex roof designs. On til you get on top of d roof b/4 you can give comprehensive details or accurate measurement.

there is no roof that can't be estimated b4 its built - I understand your point but don't forget QS give roof estimates even before the building start? how do they do it?

obviously, its possible

Abbesuper123:
Nice one OP, I'm a quantity surveyor and I like what you did there, it's educative � �

thanks sir... appreciate

mastech1:
@op kindly confirm or explain if this calculation can be used to quantify the no or size if nigerite slate were to be used.

I've done that calculation in a separate post here >> https://www.nairaland.com/4256068/how-calculate-quantity-cost-asbestors

you can find more, just follow or check my old post

karlswizzy:
op are you a quantity surveyor. nice job

Architect

HOW TO CALCULATE THE TRUE LENGTH OF C IN R1 (diagram 1,2,3 above) also see attached diagram below

From the Architectural Drawings you can get the HEIGTH AND BREATH OF THE ROOF, what the drawings won't tell you is C (I dimensioned it thou for learning purpose in the attached diagram)

USING TRIGONOMETRY A² + B² = C²
= 4.2² + 4.5² = C²
= 17.64 + 20.25 = C²
C² = 37.89

C = Root of 37.89
C = 6.15548

C = 6.155 (same with the dimension from AutoCAD)

Thanks

Good Day; Its feels good typing 'see who's back' - with my last post over a year now - apologies to my followers and thanks to those who kept it touch.

I've been wanting to do this topic but couldn't come up with the easiest way to teach it; while it is possible to measure the quantities of roofing sheets needed for your project even before you set the first block using the Architectural drawings; it requires a lot of experience especially in trigonometry and site visualization. I have however found an easy way around it; as would be discussed below.

I have carefully designed and attached a roof plan for this purpose, (feel free to use should it fit your building design... lol)

Calculating the quantity of roofing sheet needed is done is meter square (m2), same parameters used for selling and purchasing roofing sheets hence we would expect to use the AREA FORMULAS (i.e Area formulas for Rectangle / Square, Triangle, Trapezium and Rhombus), sounds easy right? Yes it is!!!

The most difficult aspect of calculating Area of Roofing is FINDING THE TRUE LENGTH (Technical Drawing students should understand this) and that is infact why I opted for the practical way to calculate because I expect the roofing carcass to have been done on site before you can apply this teaching by asking your carpenter to measure key length as we would explain soon. (We would also discuss finding TRUE LENGTH in brief at the end of this tutorial)

LETS GET TO BUSINESS....

Diagram 1: shows the roof plan and the front elevation of a building while
Diagram 2: shows the division and label to guide us in our calculation.
Diagram 3: shows the dimensions of lengths that are ALREADY IN THEIR TRUE LENGTHS (those not labeled would have to be measured on site or calculated)

We would calculate the roof per section eg R1, R2, etc and add up later. (PRINT OUT THE ATTACHED DIAGRAMS)


Let's start by calculating R1.

The shape R1 is a triangle, so we would use the triangle formula (½BxH) where B = (A+B) in Diagram 2 = 9m and H is the true length of C. (ask your carpenter to measure (A+B) and C on site and write down the distance in meters). Measuring from my drawings C = 6.15m

Hence area of R1 = (9m x 6.15m) / 2
Area of R1 = 27.68m² (what this means is that minus waste, we need 27.68m² of roofing sheet to roof R1 alone) we would add waste after the entire exercise.

Now let's calculate R2:

The shape R2 is a trapezium hence the formula would be ½x(A+B)xH - (notice i divided R2' out) here the carpenter should measure the following distances and you can note them down; R, (F-K) and D in true length. R = 7m, F-K = 18.4-2.4 = 16m and D = 6.15m (measured from my drawings).

Hence area of R2 = ½ (7+16) x 6.15 = (23m x 6.15m) / 2
Area of R2 = 70.73m²

I separated R2' to make the calculation and formula application simplier. R2' wld now be calculated as a Rhombus using formula L x B.

Hence area of R2 = O x O' = 2.4m x 3.05m (measured from my drawings as I expect you to measure from site)
Area of R2' = 7.32m² also note that R2' = R7 hence R7 = 7.32m²

LETS FAST TRACK THE CALCULATIONS

Calculating R3:

R3 = R2 - (the small triangle in R4&R5) so I'll calculate the small triangle and subtract from R2.
hence; the area of the smaller triangle using same principle from R1 = (7m x 4.7m ) /2 = 16.45m²

R3 = 70.73 - 16.45 = 54.28m²

Now let's calculate R4 & R5: The trapezium formula applies here also; measure F, I and Q where F is the true length and F = H in the formula ½x(A+B)xH
= ½ (3.99+7.49) x 4.8 = (11.48m x 4.8m) / 2
Area of R4 = 27.55m²

Area of R5 = 27.55m² also


Now let's calculate R6 and R8: If you look at the roof plan critically, you would notice that R6 + R8 = A perfect Triangle; so instead of calculating them separately, draft it into a complete triangle and calculate using the triangle formula. Coincidentally also, R6 +R8 = R1 so lets just pick the figures from R1.

Hence R6+R8 = R1
Area of R6+R8 = 27.68m²

TOTAL AREA OF ROOFING SHEETS NEEDED THEREFORE = R1+R2+R3+R4+R5+R6+R7+R8
= 27.68 + 70.73 + 7.32 + 7.32 + 54.28 + 27.55 + 27.55 + 27.68
= 250.11m²

Now lets add waste of 10% - 20% depending on the roofing material e.g. Gerard roofing sheet would generate more waste than Long Span roofing sheet.


ADD 20% = 250.11 + 20% of 250.11 = 250.11m² + 50.02m²

TOTAL AREA OF ROOFING SHEETS = 300.13m²


Multiple 300.13 by the price of 1m² of roofing sheet eg N3200 (Gerard) = 300.13 x 3200 = N960,416:00k (Minus Accessories)


I'll briefly explain calculating TRUE LENGTH of C in R1 below.

RIP

inspiring

Kaybthaniels:
Oga Saydfact, abeg you have contact of anyone that does tank stand in Lagos?, if yes, I will appreciate if you share with me, Thanks in advance.

There is none I can personally stand for.... thanks for following my thread

congrats dollar man and incoming Gov of Lasgidi

congrats dollar man and incoming Gov of Lasgidi

congrats dollar man and incoming Gov of Lasgidi

thanks

African and African Nations should know that we can only be GREAT together - Not in Isolation....