Filling gaps between the boards, good idea?
Filling gaps is an effective way of eliminating draughts, 98% of houses have air bricks at ground level. There will be a continuous amount of air passing under the house, when you take up the carpet that air will create a vacuum and suck warm air from your room and pass it out the house through the air bricks. Filling gaps stops the warm air leaving the room maintaining the temperature of the room as you remember it was with carpet. Above ground level rooms; this stream of air is not present so it would be purely a decorative reason. Gap filling actually look great on most floors.
