You plan to install a new ceramic floor or a vinyl floor and the thickness of the underlayment is a concern. Cement boards provide a less thicker, exceptionally hard, and durable underlayment. It is better than plywood and efectively prevents the growth of mold and mildew.

What is a Cement Board?

  • A rigid substrate made of Portland cement, aggregate and glass mesh
  • Withstand prolonged exposure to moisture
  • Does not rot, disintegrate or swell when exposed to water
  • Provides execent support and robustness to the floor
  • Ideal for ceramic underlayments or backing surfaces around bathtubs, showers and countertops
  • Available in various widths, lengths and thicknesses
  • Easy to cut with a untility knife

Typical Cement Boards Applications

  • Floor underlayment in kitchens, foyers, laundry rooms, mud rooms, bathrooms
  • Countertops
  • Backsplashes
  • Bath tub and shower enclosures
  • Saunas and steam rooms
  • Garden and whirlpool tubs
  • Swimming pool and whirlpool decks and enclosures

Steps to Installing Cement Board Floor Underlayments

  • Spred thin-set mortar strating at the longest wall using a 1/4″ notched trowel
  • Set the cement board on the mortar with the rough side up
  • Fasten the cement board using 1 1/4″ cementboard screws every 6″ at 8″ intervals in the filed of the cement board
  • Cut cement board as required to follow the surface of the floor
  • Place alkali resistant fiberglass mesh tape over the seams and fill all the gaps with thin-set mortar by using a putty knife
  • Allow the thin-mortar to cure per maufacturer’s instructions before starting tile installation

Required Tools and Materials

Tips for Installing Cement Boards

  • Make sure the edges are offset from the subfloor seams
  • Flush all the screw heads with the surface of the boards
  • Leave 1/8″ expansion gaps at all joints and 1/4″ around the walls
  • Do not use conventional paper drywall tape, joint compound and drywall nails or screws fro cement board installations
  • Do not use cement boards as a moisture barrier, use proper moisture barriers instead
  • Do not expose cement boards to temperatures exceeding 225°F (107°C)

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