| Vinyl floors are typically laid over particleboard underlayment, which absorbs water like a sponge and then swells up. |
| The body of the floor rests unattached to an appropriate underlayment. |
| If, however, the floor is off level, you will need to fill in the low areas before the underlayment is applied, to create a level floor. |
| Use a leveling compound in all the low and dished areas, and then allow it to dry before installing the underlayment. |
| Never use the foam underlayment with moisture barrier on wood floors or wood subfloors. |
| To undercut the door jam, lay a piece of scrap flooring on the underlayment and using that as a guide, saw off the bottom the door jam so the plank will fit. |
