Georgia Septic Installer Practice Test

What layer should be placed on top of the aggregate above the perforated pipe before backfilling?

1. A layer of concrete

2. A layer of pervious building paper

3. A layer of plastic sheeting

4. A layer of gravel

The correct answer is: A layer of pervious building paper

A layer of pervious building paper is an appropriate choice to place on top of the aggregate above the perforated pipe before backfilling in a septic system installation. This material serves an essential function in allowing water to move through while providing a barrier that prevents soil from entering the aggregate and clogging the perforated pipe. Building paper can keep soil and other particulates from mixing with the aggregate, maintaining proper drainage and helping to ensure that the septic system operates efficiently. This layer protects the pipe system while permitting effluent to flow out into the surrounding soil effectively. In contrast, other materials like concrete, plastic sheeting, or gravel would hinder performance in various ways. Concrete would create an impervious barrier, stifling drainage. Plastic sheeting would also block water from infiltrating, leading to issues with water drainage. Gravel may also not provide the same protective qualities against soil intrusion that building paper offers. Thus, using pervious building paper is crucial for maintaining the longevity and functionality of a septic system.