# Thread: Calculate time it will take to build a wall

1. ## Calculate time it will take to build a wall

Hi

I'm trying to create a spreadsheet that will work out how many days it will take to build a wall. Your help would be very appreciated as my brain is going to explode.

I know how many bricks are in a metre squared and how many bricks can be laid in a day by a single bricklayer.

The issue is that a wall can only be built to a certain height before it falls over, so the bricklayer has to return the next day when the mortar has set.

So how long would this wall take to build and how to calculate if the length, height and amount of builders change?

Length = 17.5m (variable)
Height = 1.8m (variable)
Max Height in a day = 1.4m (fixed)
Amount of bricks in a m2 = 60 (fixed)
Amount of bricklayers = 2 (variable)
Amount of bricks laid per bricklayer per day = 275 (Fixed)

Its easy to work out in my head as it is obvious that the bricklayers would have to come back an extra half day to finish off but what if the wall was 100m long and 10m high?

I assume this is an algebra question as it has variables, if I'm wrong please tell me which forum to post in

2. ## Re: Calculate time it will take to build a wall

Will the bricklayers lay full length rows before proceeding to the next row? Or will they build a section to max height the length they are able to complete in a day?

3. ## Re: Calculate time it will take to build a wall

Hi good point and yes they will build a full row

4. ## Re: Calculate time it will take to build a wall

Actually correction : walls can only be built 4 metres along at a time

5. ## Re: Calculate time it will take to build a wall

I think we're going to need the exact brick size to complete this for all cases.

UK standard brick seems to be 215mm x 65mm with 10mm mortar joint horizontal and vertical.

That look ok to you?

6. ## Re: Calculate time it will take to build a wall

Yes that is correct

7. ## Re: Calculate time it will take to build a wall

Please exp-lain what is meant by these two statements and why they are variable ....
Length = 17.5m (variable)
Height = 1.8m (variable)

8. ## Re: Calculate time it will take to build a wall

That is the size of the current example of wall. And they are variable because they could be larger or smaller numbers the next time a wall is built.

The fixed numbers can't change.

9. ## Re: Calculate time it will take to build a wall

"... it is obvious that the bricklayers would have to come back an extra half day to finish off "

Please explain how you arrive at this statement.

10. ## Re: Calculate time it will take to build a wall

I don't feel like explaining that statement will help with the calculation but anyway... if 2 builders can build a wall measuring 17.5m x 1.4m in a day they will have to return the next day to finish off which would take about half a day.

Steff

11. ## Re: Calculate time it will take to build a wall

Steff, replies to your problem will be as "obscure" as the problem statement...
get my drift?

12. ## Re: Calculate time it will take to build a wall

Ignoring the mortar joints ....
If the amount of bricks laid per bricklayer per day = 275 (Fixed) and the mount of bricks in a m2 = 60 (fixed), a bricklayer can lay 275/60 m2 per day. If the max Height in a day = 1.4m (fixed), a bricklayer can lay 1.4/(275/60) m length per day.