Some Points on Rough Ins – The Things You Need To Consider


Today we wanted to talk about rough ins. Rough ins really is a funny name, somewhat contradictory. Rough ins, the placements of pipes and fittings in the wall, for plumbing and appliances, needs to be done precisely if you want to ensure the best results. A poor rough in means poor fit off, it can mean exposed pipes and ugly tiling. A poor rough in may not comply with regulations and can cause issues with damage later. 

With this post we’re talking predominantly about plumbing rough ins, and the need to use a licenced plumber who invests in the right fitting – it’s not just about connecting the pipes together and ensuring the rough in lasts. 

At MGP Services we use Rehau fittings for all of our gas and water service fittings. Rehau offers a 30 year warranty. In our nearly 2 decades of plumbing we’ve never seen a Rehau leak. It is a system that relies on extreme compression of soft plastic piping inside a hard flexible plastic casing for a permanent seal. Others may use a cheaper option available from Bunnings – a push in fitting that uses a washer and teeth to fix and seal a pipe in position. These cheaper fittings only have a 5 year warranty. 

Whilst Rehau fittings might be slightly more expensive to install (and the tools required are expensive for plumbers to purchase) the upfront investment works out as better value. Push fittings are cheap and nasty, and we’ve seen it too many times where people cut corners and it ends up costing clients more money when they have to fix leaks down the track. If you’re not going to choose MGP Services make sure you ask your plumber if they’re going to use Rehau fittings.


There are a couple of other common rough in issues we wanted to cover.

Sewer Rough Ins – Does your sink, shower or bath make a gurgling noise? If so, it’s likely because of negative air pressure siphoned through the sewer. This happens primarily when a sewer trap hasn’t been ventilated properly – an issue caused at the rough in phase. If it’s not sized to regulate with correct airflow, this problem is almost impossible to rectify afterwards. You need the rough in to be precise so there aren’t too many bends as this can cause your siphonage issues. Make sure it’s located correctly. 

Water Service Sizing – Different areas of Melbourne have different water pressure levels yet standard houses only require pipes of a minimum 20mm. You need to take into account the general water pressure in the area where you’re doing the rough in and make sure you put in the appropriate pipes accordingly. Otherwise you may see water pressure drops if someone turns the kitchen sink on whilst you’re in the shower. 

Hot Water Sizing – 16mm pipes are the minimum requirement for hot water, but when you’re doing a rough in you want to ensure that you have the right pipes for the right house. If you’re going to have 2 showers going at once, you’ll need bigger pipes. Rough in your hot water pipes for demand, not just to minimum specs.

We hope this article has helped you understand different aspects of rough in and how it can help with the construction of your house. If you’d like to have a chat about our rough in services, get in touch today



Contact us today to assist you with your plumbing and gas fitting requirements. We might be located in Frankston, but we don’t stop there!
We provide our plumbing services to all of Melbourne, both residential and commercial.