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B Flashcards

(8 cards)

1
Q

What is the first step in locating corner stakes for a building?

A

Establish a baseline

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2
Q

How do you use 3-4-5 rule to establish a 90-degree corner?

A

Measure out along the reference line four feet, measure the opposite line 3 feet, then measure between those two points. If the distance is 5 feet, you don’t have a 90 degree corner and you’ll have to adjust the angle between the lines accordingly.

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3
Q

Roughly how far from the building’s outside corners do you place the batter boards and why?

A

Minimum of 4 feet; so equipment operators and builders can do their work.

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4
Q

What’s the customary allowance for a working space for constructing forms?

A

2 feet

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5
Q

What do you use to clean rock or concrete surfaces before you place fresh concrete on them?

A

Stiff brooms and compressed air or water.

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6
Q

Why do you moisten a clay subgrade before you place fresh concrete on it?

A

To help subgrade from extracting moisture from the concrete.

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7
Q

Before you place concrete on a sand or gravel subgrade, what do you use to keep from extracting moisture from the mix and making the concrete set too fast?

A

Burlap, tarpaper, or polyethylene. Overlap the burlap and moisten it, lap the tarpaper at least an inch, and lap the polyethylene at least 12 inches.

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8
Q

What problems could a puncture in the vapor barrier cause?

A

Moisture could get trapped between the concrete and the barrier, resulting in shifting, cracking or splitting.

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