The overflow hole is necessary to prevent the bathtub from overflowing and causing water damage. Generally, the hole is usually located on the side of the tub and it will be between 1-1/2″ to 2″ in diameter, with a depth of around 1/2″ to 1″ depending on the bathtub. The size of the overflow hole in a bathtub varies depending on the tub type and style. What size is the overflow hole in a bathtub? Installing a vent, most often located in the roof, is the best way to ensure proper ventilation of the drain system. Without this proper ventilation, water could start to back up in the piping system, resulting in water coming out of the overflow and onto the bathroom floor. This is because the air pressure in the drain plumbing system needs to be balanced, and a vent allows air to enter and leave the drain system as water does. Yes, a tub with an overflow needs a vent in order to properly function. If the sealant is damaged at any point, make sure to remove the seal and reapply the process. Make sure to use an even amount of pressure to ensure a uniform application.Īfter applying the sealant, allow it to dry for 24 hours before using the bathtub and be sure to keep the tub dry during this process to ensure that the sealant will not be damaged in any way.Īfter the sealant is dry, it should create an air-tight seal that should prevent any water from leaking through the overflow drain. Next, apply a paintable silicone sealant to the surface around the drain and then use a putty knife to spread the sealant outwards. Once the surface is prepared, cover the overflow drain with painter’s tape to ensure that the sealant won’t stick to the overflow drain. Make sure to sand the surface with sandpaper and then use a cleaning solution to remove any dirt or dust. Sealing a bathtub overflow drain can be done by first preparing the surface area of the tub. How do you seal a bathtub overflow drain? Make sure the stopper is firmly in place.Īfter that, fill the tub with water to test that the overflow drain has been effectively plugged. Once the plug insert has been securely tighten, plug the excess hole with a rubber stopper. You may need to use a screwdriver or pliers to tighten the fitting onto the overflow tube. Once located, attach a plug insert into the tubing that is connected to the overflow. To do this, you will need to locate the overflow drain in the bathtub, which is usually located at the start of the bottom edge of the tub. Yes, it is possible to plug your bathtub overflow. What size is the overflow hole in a bathtub?.
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