Wall leak with flooring probems

we had a roof collapse in January of this year. For a year previously we knew we had a leak in the roof. Now that the roof has been fixed we are experiencing a problem with our flooring (the cheap floorboards under the carpet are buckeling). We have been told since there are no apparent pipes under the house leaking it appears the mosture cmay have come from the water that was in traped the walls. Even though there are no apparent stains on the walls and the flooring has never been wet is there any way to find if there were leaks in the walls and there they may have orginated ? Even though it has been around six months since the roof was fixed and it has been hot? You can email me back at ccbeat@charter.net