Underboard on standard wooden floorboard floor?

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30 Jul 2015
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This might be a stupid question, but here goes:

I've taken an old carpet up to sand and varnish the bare floorboards beneath. They are straight edged boards with the normal gaps in-between, and I'd expected to have to draught proof these gaps. However when scraping the build up of crud from between the gaps there appears to be some kind of, I presume sheet underboard, underneath. There are a few proper gaps (maybe 5% of the floor) that go all the way through where some boards have been lifted at some point for services.

I had always thought floorboards were just laid on the joists, hence the drafty gaps. Is it normal to have thin layer of underboard between the joist and the floorboards? Does this mean there no real need to draught proofing the gaps?

This is a ground floor flat, which is part of a larger Edwardian house, it's possible it is an extension but must be older than circa 1980.

Hope it's not a daft question! Thanks
 
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