quantities Cement and sand in plastering

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quantities Cement and sand in plastering

Postby ifreeman » Wed Dec 23, 2009 10:21 am

Hi,

I have asked my contractor to show me quantities for sand and cement he will use.He replied

for 2cm plastering ratio 1:1:5 for 1sqm of wall
- 8.5kg cement
- 0.023cbm sand

I thought that plastering would be, for 1cbm
- 0.8cbm sand
- 6 bags of 50kgs of cement

which would become for 2cm X 1sqm
- 6.0kg cement
- 0.016cbm sand

1. could someone confirm if the quantities I calculated are right?
2. there is 40% difference with his quantities. Could it be that there could be 40% losses during the mix process?


Also, he mentioned something I didn't see on this forum
Stiffener for block wall 1 meter
- size : 0.07X 0.10X 1.0m
- cement : 18.2kg
- stone No 3,4 : 0.04cbm
- Sand : 0.07cbm

Does someone know what is it and could confirm the quantities are right?

thanks in advance
ifreeman
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Re: quantities Cement and sand in plastering

Postby geordie » Wed Dec 23, 2009 3:55 pm

i am assuming that by stiffeners he is talking about the beams they cast into the walls to stiffen them seval members have posted pictures

regarding sand and cement you do get a lot of shrinkage and compaction especially after the sand has been washed also a slight increase in thickness can double the amount used i;e a thicker bed or render can eat the stuff

given the low cost has your builder been extortianate
my comments may be wrong but never deliberately
If it aint broke, dont fix it
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