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Overcoming Below-Grade Issues When Installing a Basement Bathroom

Basement, Basement, Bath, Construction How-To, Flooring Installation, Plumbing, Plumbing - Directory, Projects, Punch!, Remodeling, Tile, Tile October 10, 2011 admin


By Matt Weber, Photos By Hal Jones

 

Creative thinking combined with innovate building products give rise to a beautiful basement bathroom.

Hal Jones, online media director of the Extreme How-To, was adding a new bathroom in the partially finished basement of his family’s lake house. Working in his favor was the fact that the unfinished space gave him a fresh canvas on which to install the bathroom amenities. However, working against him was limited square footage because the adjacent areas had already been partitioned into finished rooms. Plus, the area of construction was located on a solid concrete slab, with no drain system in place. Here’s how Hal employed traditional techniques, state-of-the-art fixtures and new DIY-friendly materials to conquer those obstacles and create a bathroom to brag about.

 

Fixture Fix-Up

The plumbing fixtures provide the function and focal points of a bathroom, and Hal chose Kohler fixtures to outfit the project. Kohler’s Revival Series white, porcelain pedestal-style sink provided a sleek look while economizing space. Kohler’s matching Revival Top-Trip high-efficiency toilet featured two interesting top-of-the-line attributes, a bidet (AKA dog water fountain) and an electronically heated seat, making this water closet top contender for “Most Lavish Toilet in Winston County, Alabama.” The bathtub was Kohler’s triangular Cornerstone Whirlpool Bath complete with soothing water jets and comfortable armrests to relax in a spa-like atmosphere. Hal was definitely making the most of this project.

Ever seen a bidet in action?

Ever seen a bidet in action?

The supply valve beneath the toilet tank has a T-fitting to provide the bidet feature.

The supply valve beneath the toilet tank has a T-fitting to provide the bidet feature.

Drain Platforms. The first order of business for the plumbing fixtures was to determine a game plan for addressing the lack of drain plumbing. The solution: Raise the fixtures. Rather than cut into the concrete with a slab saw or jackhammer to make clearance for drain lines, Hal took an alternative approach. He constructed joisted a plywood platform for the toilet, similar to building a miniature deck, which elevated it several inches off the floor and provided just enough space to install the necessary drain lines. The toilet was then installed as usual with a flange and wax ring atop the platform. Hal also built a platform and knee-wall that encased the bathtub drain lines, which were also routed above the slab. Naturally, the fixture platforms reduce headspace when someone is standing on top of them, but Hal decided it was a logical compromise for easier installation on this project.

The toilet was installed atop the platform as usual. Shown here, Hal Jones is drilling the platform for the toilet drain.

The toilet was installed atop the platform as usual. Shown here, Hal Jones is drilling the platform for the toilet drain.

For this bathroom, elevated platforms were constructed beneath the tub and toilet to provide clearance for drain lines. The platforms were leveled with shims as needed.

For this bathroom, elevated platforms were constructed beneath the tub and toilet to provide clearance for drain lines. The platforms were leveled with shims as needed.

 

A powder-actuated fastener is a powerful tool for nailing the floor plate of a partition wall to a concrete subfloor.

A powder-actuated fastener is a powerful tool for nailing the floor plate of a partition wall to a concrete subfloor.

The water supply and electrical lines were routed through the wall studs. A right-angle drill is a handy tool for drilling the studs.

The water supply and electrical lines were routed through the wall studs. A right-angle drill is a handy tool for drilling the studs.

To make sure the surface of the wood decking had a good waterproof seal from the inevitable drips in a bathroom environment, Hal brush-applied ProFlex Primer and Sealer over the top of the plywood decking.

The above-grade drain lines for the individual fixtures still didn’t address the lack of a main drain stack. To solve this issue, all the plumbing fixtures were tied into a SanifloSanicube pump, located out of view in the unfinished basement on the opposite side of the bathroom wall. The Sanicube was chosen due to its capacity for handling a washing machine and a future kitchenette addition. The pump includes a macerating blade to liquefy solid waste, which is then pumped upward to tie into the existing drain stack of the house.

The drain lines were pieced together from PVC plumbing.

The drain lines were pieced together from PVC plumbing.

After lifting the tub onto the platform, Hal is checking to ensure the tub is level. Room to work is critical to such a big project. This photo was taken from an adjacent room, and the lack of wall between the rooms made it easy to transport the tub into the space. Erecting the partition wall between the two rooms is the final phase of the project.

After lifting the tub onto the platform, Hal is checking to ensure the tub is level. Room to work is critical to such a big project. This photo was taken from an adjacent room, and the lack of wall between the rooms made it easy to transport the tub into the space. Erecting the partition wall between the two rooms is the final phase of the project.

The supply lines for the fixtures were installed using a PEX system, which costs significantly less than traditional copper and is simpler to install. The PEX system was tied into a manifold, which enables the various supply lines to be shut off independently for easy installation and maintenance of the plumbing system.

Shown here is the bathroom plumbing integrated into the elevated platform.

Shown here is the bathroom plumbing integrated into the elevated platform.