How to determine if a floor is level.
The floor is croked.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
The likelihood a given floor has for bending is affected by many factors but the most common primary cause is simply old age.
Laminate flooring on an uneven subfloor can cause problems and needs to be addressed.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
It s a bit confusing but a flat floor can still be slightly out of level and still create a good foundation for a long lasting floor installation.
What can be done about uneven laminate locking floors.
But laying out the laminate floor layout pattern ahead of time can still be complicated especially in an older home with out of square walls.
The floor can have an unlevel subfloor and still have a base for a nice laminate floor.
Some new flooring installations require a level subfloor such as resilient tile flooring.
Laminate floors aren t attached to the subfloor but subfloor preparation is as critical as it is when installing a nail or glue down floor.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.