CM $110$: In$-$Class Exercise #$1$

Information:

You have received an request for proposal $($RFP$)$ to complete the concrete portion of a slab on grade for a residence in northern Colorado. You will be responsible for providing and installing a $6$ mil $.$ vapor barrier, pouring and finishing a concrete slab using $2500$ psi concrete.

The slab has the following dimensions: ${25}^{\text{'}}{40}^{\text{'}}{4}^{\text{'}\text{'}}$

Keep it simple: Don't worry about turning down$/$overlapping the vapor barrier, etc. Just use straight floor area $({25}^{\text{'}}{40}^{\text{'}})$ for the calculations.

You are NOT responsible for reinforcing, pour$-$break material or formwork.

Materials:

$6$ mil. vapor barrier $-{100}^{\text{'}}$ by ${10}^{\text{'}}$ roll $-$ $$65$

$2500$ psi concrete $-$ $$\frac{105}{C}Y($includes delivery and placement$)$

$2540\frac{4}{12}$~~$333\mathrm{.}3327=12\mathrm{.}33$

Laborer installing vapor barrier $-$ Hourly rate $$\frac{16}{h}r,$ productivity rate $500$ SF $,$

Laborer placing concrete $-$ Hourly rate $$\frac{20}{?}$ hour, productivity rate $10C\frac{Y}{h}r$

Laborer finishing concrete $-$ Hourly rate $$\frac{20}{?}$ hour, productivity rate $250$ SF$/$hr

How many CY of concrete are required to complete the slab on grade?

$12\mathrm{.}33$ cy

Since unit cost has been provided $(\frac{\text{\$}}{C}Y),$ what is the total material cost for the concrete?

$12\mathrm{.}33105$~~$$1294\mathrm{.}65$

How many square feet of vapor barrier are required?

$1000$ sf

What is the total material cost for the vapor barrier?

$$65$

What is the square footage of concrete slab that must be finished?

$1000sf$

What is the unit cost $($$$/$SF$)$ for labor to install the vapor barrier?

$\frac{16}{1i}\frac{1hr}{500}=$

What is the unit cost $(\frac{\text{\$}}{C}Y)$ for labor to place the concrete?

What is the unit cost $(\frac{\text{\$}}{S}F)$ for labor to finish the concrete?