I have noticed a slight damp feel to the edge of my carpet in the lounge in one corner, I lifted the carpet and the underlay has darkened like its damp. Underneath are floor boards on a suspended floor. I have taken up the floor boards and there is no sign of moisture and all pipes etc are fine. I have ruled out kids and pets. I don't think there are sufficient air bricks and am looking at installing more but could this cause a damp underlay?
Thanks