What Should You Check in Bathroom Pipes Before Tiles Hide Them?

1. Match the pipes to the fittings you will buy

Choose the basin, toilet, shower and taps before the hidden pipe positions are fixed. Share the exact model sheets with the plumber. A tap that looks similar may need a different body inside the wall.

Ask the team to mark the final floor level and finished wall face. Plaster, adhesive and tiles add thickness. The hidden mixer body must fit the depth stated for that model, not a depth guessed from a photo.

Try the layout as a person would use it. Can the door open? Can you reach the tap? Will the basin fit without blocking the toilet? Fix these clashes while changes are still easy.

Further reading: Hansgrohe India: iBox universal basic set

2. Write down what is going inside the wall

Ask for the pipe type, size, fitting names and joining materials in the work list. Confirm which lines carry hot water and which carry cold water. Do not judge a pipe only by its colour.

For CPVC pipes, the glue-like joining material is called solvent cement. It needs time to cure, or become ready, before testing. The time depends on the named system and site conditions. Keep the current maker instructions with the job notes.

Ask the plumber to check supports, joints and capped open ends. Do not cut a beam, column or slab to make a pipe fit without approval from a qualified building professional.

Further reading: Astral Pipes: CPVC PRO technical guide

3. Ask for a proper supply-pipe test record

Water supply pipes need their own leak check before the wall is closed. Have a trained plumber choose and carry out the test for the exact pipe system and fittings. This is not a do-it-yourself pressure-test guide.

Ask which test pressure and hold time the maker requires, when the joints finished curing, and which parts are being tested. Astral’s CPVC guide calls for hydraulic testing with water, removal of trapped air and visible checks of the joints. It warns against testing with air or gas.

A photo of a gauge alone does not show that the whole test passed. Keep the method, start and finish readings, dates and the plumber’s result. If water appears or the reading changes, have the cause checked and repaired, then repeat the required test before covering the work.

Further reading: Astral Pipes: CPVC PRO technical guide

4. Check the drain as well as the water supply

A supply-pipe test does not prove that the drain is sound. Ask the plumber to test the waste line while the joints are visible. Astral’s drainage guide describes a water test before pipes are hidden, and checking joints for leaks.

Ask how the pipe falls towards the outlet, where cleaning access will remain and how the trap will be reached. A trap holds water to help stop drain smells. A slow drain, wet joint or hard-to-reach part needs attention before the finish goes on.

Also agree how the tiled floor will fall towards the floor drain. The pipe layout, drain cover and finished floor need to work together.

Further reading: Astral Pipes: DrainMaster technical guide

5. Keep the three checks separate

Supply testing checks the water pipes. Drain testing checks waste pipes and their joints. A waterproofing water-holding check checks the floor system. Passing one does not replace the other two.

After plumbing work, the waterproofing team still needs to seal pipe entries and drain edges with the chosen system. Agree the order so later drilling or moving a fitting does not break work that already passed.

Read the separate bathroom waterproofing guide

6. Keep a small record before the wall closes

In a society flat in Raysan or Sargasan, check building rules before work touches a shared shaft or common line. Keep agreed access clear. In an older Gandhinagar sector home, ask where the new pipes join the old ones and how those joints were checked.

Take clear photos of each wall and the floor with fixed reference points. Keep a simple marked layout, the product sheets and test notes. Label each photo so you know which wall it shows. These records can help a future repair, but do not prove a place is safe to drill.

The free guide below includes two planning examples and a site record. Use it to ask clear questions, not to sign off technical work yourself.

Bathroom renovation help in Gandhinagar

• Exact fitting models and final positions agreed.
• Supply and drain tests recorded, with problems repaired.
• Repair access and waterproofing handover agreed.
• Photos, pipe layout and test notes saved.