DIY bath installation : mission impossible?

Installing a bath can seem overwhelming, but it needn't be. Like any do-it-yourself project, as long as you do your research and take the proper precautions, a DIY bath installation can deliver good results: you'll be relaxing in your new bath in a matter of days.

While plumbing and waterproofing a bathroom are best left to the professionals, fitting a new bath is something that can be done by most handy home owners. Here's a step-by-step guide on DIY bathtub installation to help you along the way...

Preparation is key

Andrew Gorman, general manager of the Mornington Home Innovations Display Centre, says although installing a bath can be tricky, it's all in the preparation. "Before you start you must have all plumbing and structural work checked out by a licensed professional and approved by your local council," he says.

If you don't enlist the services of a licensed professional, insurance won't cover you if anything goes wrong – so don't risk it!

Size does matter

Carefully measure the dimensions of your bath and the area where it will fit to ensure that you have enough room. Be sure to include enough space underneath the bath for the drainage system. 

According to Scott Berkefeld from Richmond-based Guardian Plumbing and Gas Services, it's a good idea to work to a full tile height when positioning the bath. "For example, using a height of two to three tiles from the floor will save you cutting your tiles down later on," he says.

Waterproof the area

Cut out a groove in the wall for the bath to slide into. The lip of the bath should fit into the wall, thereby allowing the cement sheet and tiles to fit in place over the top.

This is an important step in your DIY bath installation project, as it is a major part of the waterproofing process, says Scott. "Once this is done you can connect your drain," he says. "Then pour a couple of buckets of water into the bath to test the trap seals on the drain to ensure it's watertight."

Add support and sealant

 Depending on the material your bathtub is made of, you may need to provide some additional support. "If you're installing a plastic bath, you'll need a mortar base for support; otherwise the bath will crack and leak," says Scott. "If it's a pressed metal bath, you don't need to worry."

It's worth taking time to apply a waterproof seal between the bath and the adjoining walls, advises Scott. Sikaflex is a good sealant to use - it's like silicone but better quality. Afterward, use a clean, damp cloth to wipe away any excess sealant.

Once your bath is in place you can get on with the fun stuff – the tiling, decor and the best bit – the satisfaction you get relaxing in your new tub.

Find bathtub and bathroom fitting retailers in your area for your DIY bath project: