CALCULATION ASSESSMENT

9/12/08

QUESTION 1
SPECIFICATIONS

Wall height 2400
Window 1 & 2 1300 high
Window 3 1200 high
Window 4 1500 high
Door 2100 high

Cover of Weatherboards 160mm

Waste 7%

Cost of board $725 per metre.

Perimeter
(8550 + 5200) x 2 = 27.5 m

Area
27.5 x 2.4 = 66 sqm

Area of openings
(1600 x 1300) x2 = 4.16 sqm
1100 x 1200 = 1.32 sqm
1700 x 1500 = 2.55 sqm
2100 x 900 = 1.89 sqm
=9.92 square metres

Nett area of house
66 - 9.92 = 56.08 sqm

Coverage of boards
1000 / 160 = 6.25lm of board in a square metre.

Weatherboards required for job
56.08 x 6.25 = 350.5 lineal metres of board required.

Add for waste
350.5 x 1.07 = 375.4 lm

Cost of board
375.4 x $7.25 = $2719.00


QUESTION 2

SPECIFICATIONS

Window 1 & 5 1350 high
Window 2, 3 & 4 1800 high
Window 6 1200 high
Door 2100 high

Wall hieght 2400

Sheets available 2.7 x 1200

Allow 7.5% waste

Cost of sheeting is $6.45 per square metre

Perimeter
(10110 + 7030) x 2 = 34.280

Area
34.280 x 2.4 = 82.272 sqm

Area of openings
(1500 x 1350) x 2 = 4.05 sqm
(1200 x 1800) x 2 = 4.32 sqm
1800 x 1800 = 3.24 sqm
1800 x 1200 = 2.16 sqm
2100 x 900 = 1.89 sqm
= 15.66 square metres

Nett area
82.272 - 15.66 = 66.612 squre metres to be clad

Sheet area
2700 x 1200 = 3.24 sqm per sheet

No. of boards required.
66.612 / 3.24 = 20.55 sheets
Add for waste
20.55 x 1.075 = 22.10 sheets
After rounding up, 23 sheets are required.

Cost
23 x 3.24 = 74.52 sqm
74.52 x $6.45 = $480.65