If your hardwood flooring has started to raise or lift up, then it likely that it has not been fitted with the correct expansion gap around the perimeter of the room. As wood is a natural product it will naturally expand and contract with changes in temperature and humidity.
If a sufficient expansion gap has not been left to allow the flooring to do this, then it is likely to start to lift up as it has nowhere else to move.
An expansion gap of at least 12mm should be left around the perimeter of the room (including doorways) when fitting any type of hardwood flooring. Flooring spacers are available to ensure that the correct size expansion gap is left. Once the flooring has been installed, the expansion gap will be covered over with skirting or beading. If your hardwood floor has been installed without an expansion gap then you should remove the skirting or beading, cut the planks of flooring down around the edge of the room to create an expansion gap, then replace the skirting or beading.
For further information, see: 'What is an expansion gap?'
