Concrete, Masonry, and Formwork Safety Flashcards

Under OSHA 1926.706, how far must a masonry wall limited access zone extend from the wall?

Answer: The wall height plus 4 feet

The limited access zone equals the height of the wall to be constructed plus four feet and runs the entire length of the wall.

On which side of a masonry wall under construction must the limited access zone be established?

Answer: The side of the wall that is unscaffolded

OSHA requires the zone on the side of the wall that will be unscaffolded, where a collapse would fall.

Masonry walls taller than what height must be adequately braced to prevent overturning unless otherwise supported?

Answer: 8 feet

1926.706(b) requires walls over 8 feet in height to be adequately braced until permanent supporting elements are in place.

Who may enter a masonry wall limited access zone while the wall is being built?

Answer: Only employees actively engaged in constructing the wall

Entry is restricted to employees actively engaged in constructing the wall; all others are kept out.

What guarding does OSHA require on masonry saws?

Answer: A semicircular enclosure over the blade

1926.701(f) requires a semicircular enclosure over the blade, constructed to retain blade fragments if the blade breaks.

Under the OSHA silica standard, what is the permissible exposure limit for respirable crystalline silica in construction?

Answer: 50 µg/m³ as an 8-hour TWA

29 CFR 1926.1153 sets the PEL at 50 µg/m³ averaged over an 8-hour day, with an action level of 25 µg/m³.

When cutting block with a stationary masonry saw per Table 1 of 1926.1153, which control method is specified?

Answer: Integrated water delivery system that continuously feeds water to the blade

Table 1 specifies an integrated water system feeding water continuously to the blade for stationary masonry saws.