CSLB C-36 Plumbing ContractorFixture and Appliance InstallationMedium
A plumber is installing a wall-mounted toilet. The rough-in dimensions specify a distance of 15 inches from the finished wall to the center of the waste outlet. However, due to existing structural elements, the actual waste pipe stub-out is 17 inches from the finished wall. Which of the following is the most appropriate solution to accommodate this discrepancy?
- ARelocate the structural elements to align with the rough-in.
- BInstall the toilet as is, as a 2-inch difference is negligible.
- CUse a standard closet flange and force the toilet into position.
- DInstall an offset closet flange.
Show answer & explanationAnswer & explanation
Correct answer: D. Install an offset closet flange.
An offset closet flange is specifically designed to adjust for discrepancies in the rough-in dimension of a toilet's waste outlet, allowing the toilet to be installed correctly without altering the main waste pipe or structural elements.
Why the other options are wrong
- A. Relocating structural elements is typically a costly and complex undertaking, often impractical for a minor rough-in adjustment.
- B. A 2-inch difference is significant and will prevent proper installation and sealing of the toilet.
- C. Forcing the toilet will likely damage the toilet, the flange, or create a leaky seal, leading to future problems.
Offset Closet Flange
A type of toilet flange with an eccentric opening that allows for minor adjustments (typically 1.5 to 2 inches) in the rough-in measurement of a toilet's waste outlet.
- Used to correct rough-in discrepancies.
- Avoids costly repiping or structural alterations.
- Ensures proper toilet installation and seal.
Memory trick: When the rough-in's off, the offset flange will scoff at the scoff.