There are also dry granular products made to soak up oil spills. Even a weekend DIY should know that every fixture that connects to a drain needs a vented P trap. The house I grew up in had floor drains in the garage, and they were wonderful. The floor drains in older homes were piped in almost all cases with a simple P-trap just like you might find under your bathroom sink. And as for car and truck oil pollution, imagine how many gallons per day leak onto the roadways around your town or city from pesky drips from engines, transmissions and hydraulic hoses. Every garage has pool areas. Floor drain basics integral trap drains building drainage zurn ab a 3 in trap e floor drain seal pvc pipe ing drainage gully trap lower type floor drain how to seal bat water traps with oil Floor Drain BasicsSureseal Eliminate Sewer Gas And Evaporation RectorsealUnderstanding Restroom Floor Drains Romtec IncHow To Unclog A Drain From… Read More » Let me tell you a story…My wife and I bought a house in the Philippines. Floor drains , much like the drains underneath your interior sinks, have a u-shaped pipe underneath them, called a P- trap . Garage floor drains get a lot of abuse, from dog hair to snow runoff to oil. Every time you use this faucet, a tiny amount of water is redirected down a small tube which disappears below the concrete floor in the basement. This tube continues over to the floor drain where the water is dumped in just below the drain cover. The size of the funnel depends on the size of the car or truck. Center the floor drains so they're exactly under the center of the car or truck when it is parked in the garage. I also used a tee fitting so I could create a surface clean-out that rises up from one end of the P-trap under the slab. Connecting a trap to a vertical drain with a wye fitting and a 45-degree elbow seems like a good idea. My builder has never heard of garage floor drains and insists on sloping the concrete floor so all liquids flow to the doors. This clean-out allows my son-in-law, or a future homeowner, easy access into the P-trap using the hose from a wet-dry vacuum. I checked several citations of the International Building Code, and there was language that garage floors must slope to the door so liquids drain to the door or to a drain. Square or round drains are cheaper, easier to install, and take less time to put in. Proper maintenance of a drain is crucial to its functionality. Old homes did not have trap primers for floor drains. They’re more expensive than other drains but they manage water flow brilliantly. As water drains down the steep slope at the wye, it can create a siphon effect such that water will be sucked out of the trap. You can always build things better than what the building code mandates. That may seem like a strange name for a plumbing part until you understand the function of this part. This allows sand and grit to settle out and not be carried into the drainpipe leaving the box drain. The chances of breeding mosquitoes in your garage are also cut down significantly with proper drainage. And the empty trap … You always need to check with your local code official and see what you can do. 1 Answer from this member: In some areas floor drains need a trap primer. I have to install a garage floor drain that MUST tie into the sanitary with a sand interceptor on a new house. This is especially true of drains that are piped directly outdoors on the land just outside the garage. No, never use a P-trap under a toilet. The floor drain controls the flow of water, preventing damage and unnecessary dirt buildup. Also, the trap needs to have an outlet slightly lower than the inlet. Installing a Floor Drain in a Garage. Shaped like the round end of a P (or a “U”), the P-Trap is the place in your drains that stops sewer gas odors from shooting back up your drains into your place of business. Dig up the concrete garage floor to make way for the new floor drain. The drainpipe exits out the side of the box drain, and the bottom of the pipe is about 1.5 inches up from the bottom of the box. That's a valid concern if you have a massive oil spill in a garage. As several others have already stated, every drain needs a trap of some sort to prevent the maliforous scent of “eau de pew” from rising out of the drain and spreading its tendrils throughout your living space. That drain has a trap. If you're worried about oil pollution, you can install a commercial oil separator as part of your drainage pipe installation. It's very important to make sure the tops of the floor drains are about 2 inches below the primary level surface of the garage slab. Check before you pour any chemicals down your drain, even it’s a cleaning solution. My builder has never heard of garage floor drains and insists on sloping the concrete floor so all liquids flow to the doors. The chances of breeding mosquitoesin your garage are also cut down significantl… If these are too troublesome for you, when you are building a garage and hired builders to do it, it is best to leave it up to them when installing a garage drain. Alternatives. And the drain I have is far from a perfect solution. You see this product at many gas stations when someone spills diesel fuel or other oil products. Having a drain installed — with the correct pitch to the floor — allows water dripping off your car or from rain falling outside (especially important in particularly rainy areas) to flow away rather than pool on the garage floor. These measure about 14 inches square and are about 10 inches deep. By signing up you agree to our Terms of Use and Privacy Policy, Discussion of news topics with a point of view, including narratives by individuals regarding their own experiences. Put in 3 so far and 2 more to go Log in … A properly designed trap should allow water to drain out while preventing air from being sucked into the blower compartment. The U-shaped pipe under the drain created a water seal, but it also allowed sand and dirt to accumulate fast. The concrete contractor needs to create large shallow funnels around the floor drains. The floor drain controls the flow of water, preventing damage and unnecessary dirt buildup. 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