Essay Question 1) Describe how a masonry cavity wall works and what aspects of c

Question

Essay Question

1) Describe how a masonry cavity wall works and what aspects of cavity wall construction are most critical to its success in preventing water leakage?

2) Before coating concrete with paints, stains, or vinyl floor covering the minimum cure time must be:

A) At least 7 days old

B) At least 14 days old

C) At least 20 days old

D) At least 27 days old

3) Flashings in masonry walls are used for?

A) Keeping water from penetrating inner layers of the building

B) Stop water from entering outer layers of masonry

C) Keeping masonry from uncontrolled cracking

D) All of the above

4) It is not necessary to install water proofing in masonry? T or F

5) Stairways typically have 7” of rise to 11”run for most treads in stairwells. T or F

Essay Question

Describe how a masonry cavity wall works and what aspects of cavity wall construction are most critical to its success in preventing water leakage?

Before coating concrete with paints, stains, or vinyl floor covering the minimum cure time must be:

At least 7 days old

At least 14 days old

At least 20 days old

At least 27 days old

Flashings in masonry walls are used for?

Keeping water from penetrating inner layers of the building

Stop water from entering outer layers of masonry

Keeping masonry from uncontrolled cracking

All of the above

It is not necessary to install water proofing in masonry? T or F

Stairways typically have 7” of rise to 11”run for most treads in stairwells. T or F

Explanation / Answer

Prob.1.

Cavity wall provides a hollow air gap in between, which prevents the water from reaching the inner wall. Certain aspects must be taken care of.

1. A minimum of 2" air gap.

2. Flashing at the bottom of the cavity to allow the water to escape through the weep holes.

3. Weep holes must be spaced at not more than 24" apart in bricks and no more than 32" apart in CMU.

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