Mixed floor types within one room

[raine]

Hi all,

Getting two rooms knocked through into one, and an extension added, to make one large room (kitchen). It's a Victorian house.

The two rooms that are being knocked into one have different floor constructions - the existing dining room has timber floorboards, and the kitchen has a solid slab type floor (overlaid with a very old "marley tiles" style vinyl / lino - stuck down).

My question is - it it normal / acceptable to keep both floor types in a single room (the new large, extended kitchen)? Or will it cause too many problems when laying floor coverings (likely tiles), getting levels to match across the room etc?.

My builder says it's quite normal to mix the floor types in a single room, but it seems worrying to me.

 

[bobasd]

"quite normal" for a knock through.

floor levels and ventilation of the suspended floors and how to bridge the possible resulting floor cavity and any indications of damp must, if possible, all be worked out before any work starts.

 

[raine]

Ace, thanks Bobasd, that answers my question.

 

[dazlight]

The old concrete needs a liquid dpm. The floorboards needs 6mm or 9mm plywood.

The new screed should be built to match the highest existing floor.

 

[foxhole]

I would not use less than 18mm ply over boards .

 

[Notch7]

Or will it cause too many problems when laying floor coverings (likely tiles),

There is a significant risk of tiles cracking at the floor joint.

I have sometimes replaced the existing joists or sistered with oversized joists -like 10 x 2. Because otherwise the floor bounce can be annoying on a tiled floor and there is too much differenct in 'feel' walking from a solid to a suspended floor

On the original suspended floor it is best to re cover with 18mm plywood, screwed at close centres.

Ditra mat helps to decouple tiles from substrate and reduces risk of cracking at floor join