Install New Drain with P-Trap and AAV — Connect the Drain Plumbing
Part of project
How to Install and Level a Shower Pan Base · Step 7 of 8
In this video
Assemble the new drain line using PVC pipes and fittings. Apply PVC primer and then cement to each joint. Install a P-trap, a sanitary tee above it for venting, and an Air Admittance Valve (AAV) on top of the vent pipe. Use 45-degree fittings to offset the pipe around a floor beam before connecting it to the main drain line in the crawlspace.
Goal: Install proper drainage
- Working in a crawlspace can be hazardous. Be aware of your surroundings, potential pests, and moisture.
- Prime all PVC joints before cementing to ensure a strong, leak-proof bond.
Used in this video
- PVC Primer and Cement Applicator — Applying primer and cement to PVC pipe and fittings.
623K subscribers
FAQs
Before installing the shower pan, how thoroughly do I need to prepare my subfloor, and what should I look out for?
Ensure the subfloor is clean, dry, and structurally sound. Check for rot, water damage, or uneven spots, repairing them as needed to provide a stable foundation for the mortar bed. A smooth, level subfloor is crucial for the pan's stability and proper drainage.
What's the right consistency for the mortar bed, and how much do I need to mix for a standard shower pan?
The mortar (like SAKRETE 80 lb. Gray Type S Mortar Mix) should be mixed to a thick, peanut butter-like consistency, allowing it to hold its shape without being too wet or crumbly. For a typical 48x32 inch pan, one 80lb bag should be sufficient, but always check the pan manufacturer's recommendations. Ensure even coverage to fully support the pan.
Beyond just using a level, what are the key steps to ensure my shower pan is perfectly level and stable?
Dry-fit the pan multiple times, checking with a long level in all directions (front-to-back and side-to-side). Once in the mortar, apply even pressure and re-check constantly, making micro-adjustments by lightly tapping high spots or adding mortar to low spots if necessary. Ensure the pan has full, even contact with the mortar for stability and proper drainage towards the drain.
What are the critical steps for correctly installing and sealing the drain assembly to prevent leaks?
Apply a generous bead of plumber's putty (like Oatey 9 oz. Stain-Free Plumber's Putty) around the drain flange before seating it firmly into the pan opening. Hand-tighten the nuts from underneath first, then use Channellock pliers for a final snug turn, being careful not to overtighten and crack the pan. Always perform a water test for leaks before proceeding.
Install New Drain with P-Trap and AAV — Connect the Drain Plumbing
Part of project
How to Install and Level a Shower Pan Base · Step 7 of 8
In this video
Assemble the new drain line using PVC pipes and fittings. Apply PVC primer and then cement to each joint. Install a P-trap, a sanitary tee above it for venting, and an Air Admittance Valve (AAV) on top of the vent pipe. Use 45-degree fittings to offset the pipe around a floor beam before connecting it to the main drain line in the crawlspace.
Goal: Install proper drainage
- Working in a crawlspace can be hazardous. Be aware of your surroundings, potential pests, and moisture.
- Prime all PVC joints before cementing to ensure a strong, leak-proof bond.
Used in this video
- PVC Primer and Cement Applicator — Applying primer and cement to PVC pipe and fittings.
Frequently Asked Questions
Before installing the shower pan, how thoroughly do I need to prepare my subfloor, and what should I look out for?
Ensure the subfloor is clean, dry, and structurally sound. Check for rot, water damage, or uneven spots, repairing them as needed to provide a stable foundation for the mortar bed. A smooth, level subfloor is crucial for the pan's stability and proper drainage.
What's the right consistency for the mortar bed, and how much do I need to mix for a standard shower pan?
The mortar (like SAKRETE 80 lb. Gray Type S Mortar Mix) should be mixed to a thick, peanut butter-like consistency, allowing it to hold its shape without being too wet or crumbly. For a typical 48x32 inch pan, one 80lb bag should be sufficient, but always check the pan manufacturer's recommendations. Ensure even coverage to fully support the pan.
Beyond just using a level, what are the key steps to ensure my shower pan is perfectly level and stable?
Dry-fit the pan multiple times, checking with a long level in all directions (front-to-back and side-to-side). Once in the mortar, apply even pressure and re-check constantly, making micro-adjustments by lightly tapping high spots or adding mortar to low spots if necessary. Ensure the pan has full, even contact with the mortar for stability and proper drainage towards the drain.
What are the critical steps for correctly installing and sealing the drain assembly to prevent leaks?
Apply a generous bead of plumber's putty (like Oatey 9 oz. Stain-Free Plumber's Putty) around the drain flange before seating it firmly into the pan opening. Hand-tighten the nuts from underneath first, then use Channellock pliers for a final snug turn, being careful not to overtighten and crack the pan. Always perform a water test for leaks before proceeding.