hi, need some advice...we have had just over 3 months ago laminate flooring installed in living room & dining room areas...all has been fine except for the last approx 2/3 weeks there is a definate lifting of the laminate in middle of room (ie when you tread on it it actually springs up and down approx i would guess around a 1/4 of an inch..there are only about 4 to 5 strips that are affected...the floor has not gotten wet..it was laid by professional floor company not by me..it seems to me like that it does not have room to expand..but also, we did have a door installed ( bifold) after the flooring was laid and i see there is a small screw into a bracket that helps to hold door level & the screw is screwed into the flooring....could this screw be stopping the floor expanding ? i have the company coming up to look at the floor on wednesday & they have already told me that the flooring ONLY expands width ways NOT length ways...is that right ? and i do not want them to say the screw has caused the problem if it has not or could not have..but if it has caused the problem i will accept it is my fault..i just do not want to be hoodwinked & allow them to get away with not putting the floor right, sorry to rant on..but any advice /help would be greatly appreciated