CSLB Trade — General Building (B)

A concrete mix is batched with 620 pounds of cement per cubic yard. To hold the water-cement (w/c) ratio at a MAXIMUM of 0.45, what is the greatest amount of water that may be used per cubic yard?

1. AAbout 279 poundsCorrect
2. BAbout 344 pounds
3. CAbout 248 pounds
4. DAbout 310 pounds

Why: The w/c ratio is water weight divided by cement weight, so maximum water = 0.45 x 620 = 279 lb. 248 lb corresponds to a 0.40 ratio, 310 lb to 0.50, and 344 lb to 0.55, all of which miss the specified 0.45 limit.2025 CA Building Code (CBC) Chapter 19 (Concrete)

When installing a window in an exterior wall with a weather-resistive barrier, the flashing should be lapped so that:

1. AOnly caulk is used, with no flashing, so a continuous bead around the window becomes the water seal
2. BAll flashing is installed after the siding, laid over the finished wall where it can be seen and replaced
3. CUpper pieces lap over lower pieces (shingle fashion) so water drains outwardCorrect
4. DThe head flashing tucks behind the sill pan, so the sill piece is the outermost layer at the opening

Why: Flashing must be shingle-lapped, with the sill pan first, jamb flashing over the sill, and head flashing lapping over the jambs and tucked under the upper WRB, so water always sheds down and out. Reversing the laps, flashing after siding, or relying on caulk alone traps water and causes leaks.2025 CA Residential Code §R703