Week 3

1
Week 3
2
Electrical

• Code
• 1. all electrical outlets run off a pigtail from
  main line
• 2. Each Circuit is wired directly into circuit
  panel - no junction boxes
• 3. Bathrooms must have GFCI either at panel or
  first outlet must be GFCI

3

• 4. In rooms must have outlet
• a) on any wall longer than 2
• b) no more than 6 from any door
• c) no more than 12 feet apart along wall
• d) less than 18 off floor

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• 5. Kitchen
• a) Refridgerator on own circuit
• b) at least two circuits for outlets
• c) must have outlet on island if more than 6 sq
  ft
• d) outlets within 6 feet of sink must be GFCI
• e) all countertops must have a wall outlet

5

• 6. Must have at least 1 outside outlet - GFCI
• 7. Dont forget furnace
• 8. Fire detectors must be hard wired into a
  circuit with lights

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• 9. Separate circuits for Clothes Dryer, Electric
  Range, Electric Ovens, Electric Hot Water Heater,
  Gas Range, Electric baseboard heaters
• 10. Must fill all holes between floors with a
  fire stop caulk
• Know local code - does all wiring have to be in
  conduits?

7
Plumbing

• 1. All drain pipes must be vented
• 2. Sewer pipe must be PVC Schedule 40 or better -
  can use cast iron pipe
• 3. All sewer pipe joints must be welded
• 4. Minimum 3 pipe for toilets and main runs

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• 5. Minimum 1-1/4 pipe for sink drains
• 6. 1/2 pipe minimum for water pipes type L
  copper
• 7. 3/4 copper pipe for baseboard heat

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• 8. Gas is piped through Black Iron pipe and
  fittings or rolled copper tube
• 9. boilers and hot water heaters must have a
  pressure relief valve and piping to floor
• 10. Rough in plumbing includes setting tubs and
  showers - need to insulate outside walls before
  they are installed

10
Large Projects

• Estimated differently than other projects
• Many involve several separate construction
  projects
• May be large area
• Roadway
• Super Walmart
• Large housing development
• Have to look at project to do estimate correctly

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• May break project into quadrants or sections to
  facilitate scheduling (allows faster completion)
• Need to estimate each section to get correct
  quantities
• Wont be the same quantities as if doing 1
  estimate

12
Contingencies

• What is it?
• Risk factor
• Allows contractor to factor in the unknown
• The less that is known about project higher the
  contingency
• Design Build has a high contingency at start of
  project
• decreases as project is built

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• Why do you want to minimize it?
• Part of bid
• Drives up final price
• Need a good estimate
• Contingency never equals zero
• Always something that is not known
• Price fluctuation
• Weather
• Labor

14
Mobilization

• How much does a piece of equipment cost
• Need to include getting it to/from site
• Need a truck to haul each way
• Each time equipment is brought on site cost money
• Want to minimize how
• What is cost?
• Truck, driver, setup, inspection
• May need equipment to set up

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Unit price bid

• We have been talking about a lump sum estimate
• Unit Price estimate gives price per unit to do
  work
• Multiply units by price to get cost
• Still need a good estimate to find errors
• Includes all costs associated with item
• Mob/Demob, material cost, labor cost