I have laid floor boards in a room but I am now worried that there should be a gap between floor boards and the walls around all four walls of the room for the air to flow through. I have left 2-3mm and you can slide a saw down the gap between the wall and the floorboards, will this be enough for the air to flow through? two of the walls are dry lined with batterns and polysteyrene, the batterens only touch the walls where the hammer fixings go through wooden blocks so there is a 5-15mm gap between the solid wall and timber wall frame, the air can flow freely from the roof behind this dryling. I am very nervus that if the 2-3mm gap around the floor isnt enough the air circulating from the loft and behind the drylined wall is going to sweat and give my floor boards dry rot, am I being stupid? or should there be more of a gap? can the boards expand getting rid of the gap all together?
Any thoughts on this welcome thanks