15. Sagging in floor joists is typically caused by
A. oversized joists.
B. undersized joists.
C. improper nailing of sub-flooring.
D. improper moisture content of the wood
i think it's D.
It's B. Undersized joists.Just did the test!
Yes, I have seen "juicy" wood also called "lake dried" installed as joists. I left that job. Undersized joists would never make it through the frame inspection.
Thanks...
To determine the correct answer, we need to understand what could cause sagging in floor joists. Let's analyze each option:
A. Oversized joists: Sagging is generally not caused by oversized joists. If the joists are too big, they would be more likely to be too strong to sag.
B. Undersized joists: This is a possibility. If the joists are too small or not properly designed for the load they need to support, they might not be able to bear the weight, leading to sagging.
C. Improper nailing of sub-flooring: While improper nailing of the sub-flooring could potentially result in some minor issues, it is unlikely to be the main cause of significant sagging in the floor joists.
D. Improper moisture content of the wood: This could indeed be a significant cause of sagging in floor joists. If the wood used for the joists has an incorrect moisture content, it can lead to warping, shrinking, or expansion of the wood, causing the floor joists to sag.
Considering the options, it appears that your instinct is correct. Option D (improper moisture content of the wood) is most likely the cause of sagging in floor joists. However, it's worth mentioning that a professional inspection or evaluation by a structural engineer would be necessary to accurately identify the cause.