Sheathing worksheet

1. 4 × 8 ft sheets to buy: 21

1. Find the floor area: length × width

   $34\times 18$$=612\text{\hspace{0.17em}ft²}$

2. Add 9% for cutting waste, divide by the 32 ft² one 4 × 8 ft sheet covers, and round up to whole sheets

   $\frac{612\times 1.09}{32}$$=20.8463$$=\text{rounded up:}21$

2. 4 × 8 ft sheets to buy: 6

1. Find the total wall area: wall length × wall height

   $32\times 5$$=160\text{\hspace{0.17em}ft²}$

2. Add 11% for cutting waste, divide by the 32 ft² one 4 × 8 ft sheet covers, and round up to whole sheets

   $\frac{160\times 1.11}{32}$$=5.55$$=\text{rounded up:}6$

3. 4 × 9 ft sheets to buy: 16

1. Find the floor area: length × width

   $26\times 20$$=520\text{\hspace{0.17em}ft²}$

2. Add 8% for cutting waste, divide by the 36 ft² one 4 × 9 ft sheet covers, and round up to whole sheets

   $\frac{520\times 1.08}{36}$$=15.6$$=\text{rounded up:}16$

4. 4 × 10 ft sheets to buy: 9

1. Find the total wall area: wall length × wall height

   $33\times 9$$=297\text{\hspace{0.17em}ft²}$

2. Add 10% for cutting waste, divide by the 40 ft² one 4 × 10 ft sheet covers, and round up to whole sheets

   $\frac{297\times 1.1}{40}$$=8.1675$$=\text{rounded up:}9$

5. 4 × 10 ft sheets to buy: 46

1. Find the roof's flat area seen from above. Add the overhang to both ends of each side, since the deck hangs past the walls

   $59\times 24$$=\mathrm{1,416}\text{\hspace{0.17em}ft²}$

2. Find the slope factor for a 7/12 pitch: how much longer a sloped foot of roof is than a level one

   $\frac{\sqrt{{12}^2+7^2}}{12}$$=1.157704$

3. Multiply the flat area by the slope factor to get the true area of both roof slopes

   $\mathrm{1,416}\times 1.157704$$=\mathrm{1,639.3084}\text{\hspace{0.17em}ft²}$

4. Add 10% for cutting waste, divide by the 40 ft² one 4 × 10 ft sheet covers, and round up to whole sheets

   $\frac{\mathrm{1,639.3084}\times 1.1}{40}$$=45.081$$=\text{rounded up:}46$

6. 4 × 8 ft sheets to buy: 17

1. Find the floor area: length × width

   $26\times 19$$=494\text{\hspace{0.17em}ft²}$

2. Add 10% for cutting waste, divide by the 32 ft² one 4 × 8 ft sheet covers, and round up to whole sheets

   $\frac{494\times 1.1}{32}$$=16.9813$$=\text{rounded up:}17$

7. 4 × 9 ft sheets to buy: 9

1. Find the floor area: length × width

   $17\times 17$$=289\text{\hspace{0.17em}ft²}$

2. Add 9% for cutting waste, divide by the 36 ft² one 4 × 9 ft sheet covers, and round up to whole sheets

   $\frac{289\times 1.09}{36}$$=8.7503$$=\text{rounded up:}9$

8. 4 × 10 ft sheets to buy: 11

1. Find the total wall area: wall length × wall height

   $46\times 8$$=368\text{\hspace{0.17em}ft²}$

2. Add 9% for cutting waste, divide by the 40 ft² one 4 × 10 ft sheet covers, and round up to whole sheets

   $\frac{368\times 1.09}{40}$$=10.028$$=\text{rounded up:}11$

9. 4 × 10 ft sheets to buy: 28

1. Find the roof's flat area seen from above. Add the overhang to both ends of each side, since the deck hangs past the walls

   $30\times 30$$=900\text{\hspace{0.17em}ft²}$

2. Find the slope factor for a 5/12 pitch: how much longer a sloped foot of roof is than a level one

   $\frac{\sqrt{{12}^2+5^2}}{12}$$=1.083333$

3. Multiply the flat area by the slope factor to get the true area of both roof slopes

   $900\times 1.083333$$=975\text{\hspace{0.17em}ft²}$

4. Add 13% for cutting waste, divide by the 40 ft² one 4 × 10 ft sheet covers, and round up to whole sheets

   $\frac{975\times 1.13}{40}$$=27.5437$$=\text{rounded up:}28$

10. 4 × 8 ft sheets to buy: 9

1. Find the total wall area: wall length × wall height

   $36\times 7$$=252\text{\hspace{0.17em}ft²}$

2. Add 11% for cutting waste, divide by the 32 ft² one 4 × 8 ft sheet covers, and round up to whole sheets

   $\frac{252\times 1.11}{32}$$=8.7413$$=\text{rounded up:}9$