You are looking at finishing your basement or installing some type of more confortable floor covering on to of an existing cement floor. Typically concrete floors are prone to be damp, especially in basements. A water resilient subfloor will provide you with the best afordable solution.

Humidity resilient pre-manufactured underlayments are design to be typically installed over concrete floor. They are interlocking tiles typically made out of plywood with plastic on the bottom. This type of subfloor allow air to circulate underneath and supports virtually any type of floor covering.

Here are the Required Tools and Materials

Wallboard Knife

1″ Wood Screws

Drilling Kit

Circular Saw

Floor Patching Compond

Flooring Roller

1/8″ Notched Trowel

Jig Saw

Utility Knife


Thin-set Mortar

1″ Deck Screws

1/4″ Notch Trowel

Power Sander

Fiberglass-mesh Tape

1 5/8″ Galvanized Deck Screws

Steps for Installing a Humidity Resilent Subfloor

  • measure the surface and calculate the number of plywood squares required – make sure you buy enough panels
  • prepare the floor – vacuum the entire surface to remove any debris, fix any leaks
  • level any low spots – any dips or low spots in the concrete surface higher than ¼” should be leveled with a Portland cement-based compound; if low spots are smaller than 1/4″, use plastic, rubber shims or a leveling kit
  • acclimatize the panels in the room where will be installed for 14 days – lay them on the floor with the plastic surface down
  • for the first row, cut and staggered each second square
  • if the last row will be less than 6″ wide, balance the width by trimming from the frst row
  • place 1/4″ expansion gap spacers around the walls
  • lay the first panel starting from a corner – place it with the groove against the wall
  • lay the next panel in place and fit its groove into the tongue of the first panel
  • tap the panels in place by using a block of wood and a mallet or a hammer
  • at the last row just tap down the panels
  • remove the spacers around the walls once all the flooring is installed

Building Interior Walls

  • set the interior stud wall on top of your new subfloor – build and your 2X4 frame on top of the subfloor
  • screw the plates of the frame into the cement through the underlayment – use one self-tapping concrete screw every 6 feet
  • if the frame is built out of metal studs, secure it every 2 feet
  • screw the plates of the frame into the ceiling joists – use one wood screw every 4 joists

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