Vinyl click flooring underlay

jay9011

Hi, 
I'm planning to lay waterproof vinyl click plank flooring in my bathroom.
The floor is new build chipboard and relatively smooth. 
Do I need to lay a plywood sheet underlay or possibly a roll of underlay or is non required? 
Thanks very much in advance. 

FreeBear

Have LVT click flooring in my kitchen & utility rooms. Used wood fibre boards in the kitchen and a polystyrene underlay in the utility area. The installation instructions stated that underlay was not required.. Both types provide a small amount of thermal insulation (important as I have concrete floor in 75% of the area). Between the two, the polystyrene absorbs the sound of footsteps better - If your bathroom is upstairs, it is something to consider. Else I would say that underlay is not essential over a flat chipboard surface.

jay9011

FreeBear said:

Have LVT click flooring in my kitchen & utility rooms. Used wood fibre boards in the kitchen and a polystyrene underlay in the utility area. The installation instructions stated that underlay was not required.. Both types provide a small amount of thermal insulation (important as I have concrete floor in 75% of the area). Between the two, the polystyrene absorbs the sound of footsteps better - If your bathroom is upstairs, it is something to consider. Else I would say that underlay is not essential over a flat chipboard surface.

Thanks very much for your answer. Very useful. 

Rosa_Damascena

FreeBear said:

Have LVT click flooring in my kitchen & utility rooms. Used wood fibre boards in the kitchen and a polystyrene underlay in the utility area. The installation instructions stated that underlay was not required.. Both types provide a small amount of thermal insulation (important as I have concrete floor in 75% of the area). Between the two, the polystyrene absorbs the sound of footsteps better - If your bathroom is upstairs, it is something to consider. Else I would say that underlay is not essential over a flat chipboard surface.

Wwere your downstairs areas screed?

FreeBear

Rosa_Damascena said: Were your downstairs areas screed?

The utility area and half the kitchen is concrete floor with a bit of screed on top and a layer of self leveling compound. No insulation incorporated within the slab as it was not a BR requirement in the 1970s. The remainder is a suspended timber floor - Fairly typical of many homes that have been extended.