Building bespoke cover for drainage system

Question

I have a bare concrete floor in a ground-floor side extension, and there’s a drainage system in place (likely for moisture/water runoff). The room is the coldest in the house, even with a radiator.

I’d like to install laminate flooring, but I want to know the correct way to prepare the floor in this situation. Can insulation be added under the flooring to help with the cold, and if so, what type would be suitable over concrete with potential moisture?

Would I need a damp-proof membrane, specific underlay, or a subfloor system? Are there any concerns about moisture affecting laminate in this kind of space?

Or would a different type of flooring be more suitable? Please note this is for a wheelchair user and a carpet is unsuitable.

William · Accepted Answer

Hi Melissa - You’ll need to address both moisture and insulation before installing any laminate.

I would recommend applying a liquid damp proof membrane to the concrete first, followed by a suitable insulation layer such as XPS boards or a high-quality thermal underlay.

You also need to ensure the drainage point remains accessible by incorporating a recessed access cover into the finished floor.

In this type of environment, laminate can be at risk if there is any residual moisture. A more suitable option would be a waterproof LVT (luxury vinyl tile) system, which performs better over concrete and is more durable, especially for wheelchair use.

Preparation is key here – moisture control, insulation, and proper levelling will make all the difference.

Scott · Answer

Bottom line
	•	Yes, you can install laminate—but only with proper moisture protection + insulation
	•	A DPM is essential
	•	Insulation will significantly improve comfort
	•	For long-term reliability (especially with possible moisture), LVT/SPC flooring is usually the safer choice

. Carry out full cctv survey of the drainage system and check the condition of the pipe work

Melvyn · Answer

Use  water proof  tile  adhesive  to seal the  floor  first

Building bespoke cover for drainage system

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