Flooring options for house with raised floor

A

AndroidMan

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The house is around 50 years old and has a raised floor, not sure what the term is but if I were t lift the floorboards, I am sure it would go down to the soil.
Its not a warm house but is manageable.

I want to replace the downstairs flooring in the TV room and hallway. Its currently a thick carpet and underlay. That seems sufficient insulation but probably could be better. I am thinking of some thick laminate flooring. But should I consider the thicker foam-like underlay and thinner planks? Or thicker planks and thinner underlay? Just really concerned about the drafts coming up through the floor.
Also another concern is around the edges. Will that be an area drafts will come through and how best to plug that?
Any thoughts?
 
It's called a suspended timber floor and in all likelihood unsealed. The space underneath the floor should be vented to the outside.

If you do not want to remove the original floor boards, your best bet is to remove the floor covering and the skirting boards. Then lay airtight membrane over the floor from wall to wall, lapped and taped if necessary and seal the membrane at the floor edge to the wall (up an inch or two) using either airtight tape or mastic. Next lay whatever new floor covering of choice and refit either the original or new skirting boards.
 
I think you can insulate under the floor; though you need to be careful not to block the air bricks.
 
If you have a budget to spare, it's standard now to have the suspended floor to be lifted and replaced with a concrete ground floor slab on insulation
 
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