Sealing a Bathtub Drain

A bathtub drain is one of the biggest single gaps in your house, which will require sealing. The hole is large to encompass all the applicable pipes and drains from the bath, and must be sealed to avoid leakages and damp. This can cause particular problems where the tub sits over an unheated area, although it is still very worthwhile sealing the gap. In this article, we aim to discuss the best ways of sealing a bathtub drain, and the easiest ways to leave a proper, tight seal. Furthermore, we will elaborate on how to ensure a tight fit from bath to source.

The Box Method

Here's a simple tip to help when sealing a bathtub drain. Nine times out of ten, you'll find that the hole you're looking to fill is too big to hold a sealant. The best way to achieve the desired affect is to construct a ply box underneath, and then tightly seal the box, leaving a smaller hole for the pipe to pass through.

This will reduce the size of the problem, and then allow for more effective sealing to stop those leakages, and the problems associated with them. Two sides of the box are formed by the floor joists which will already be in place. To close off the remaining sides, add blocks of wood, cut to fit.

Next, seal the box with a plywood bottom, taking care to cut a hole slightly larger than the pipe. Insert the pipe through the box bottom, and seal to create a tight finish. The best thing to do from here is insulate and seal within the box, which will eradicate the problems you would otherwise face.

Insulation and Sealing

Your first step after constructing the box should be to run sealant around all the joints created by the box, to tightly seal off the area. Liberally apply the sealant to firmly seal. Next, generously insulate with household insulation, or other suitable alternatives. These can be found in any good DIY store or builder's merchants, or alternatively online.

It is always advisable to buy large quantities of insulation, as it is always handy to have too much than too little. Next ensure that you seal around the intersections with the pipes and the box, and you will have effectively sealed up the gaps that can be potentially problematic when sealing a bathtub drain.

Ensuring a tight fit at the Bath

To ensure the tightest possible fit at the bath, apply sealant generously to both sides, effectively closing up any gaps that may be present. The problem with gaps is that they allow moisture in the form of condensation which can lead to damp, and direct leakages which are obviously problematic.

These may have further negative impacts for the wellbeing of your house, both structurally and aesthetically, and subsequently should be treated with the utmost importance. Ensuring an effective seal can solve a lot of problems, so sealing a bathtub drain effectively is always a good idea.

So now you know the best procedure when sealing a bathtub drain. It's always to good to ensure you've got all the bases covered, so a good tip would be to run the bath after you've applied the sealant and allowed it to dry to test out your handy-work. That way you can see any problems as they arise, and tackle them before they cause any more problems.

See Also:

How to Caulk a Bathtub