Tongue & Groove Flooring Installation Recommendations

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Properly installing your new KAYU tongue and groove flooring is extremely crucial for long lasting performance.

Sealing

Be mindful of excess moisture in the air.  KAYU Batu and KAYU Dark Red Meranti (commonly referred to as Mahogany) T&G are kiln dried but can still absorb moisture.

When using your KAYU T&G for exterior porches is important  the material is sealed with a penetrating sealer on all four sides, thus minimizing the dimensional change.  Lengthwise, there is virtually no expansion, therefore neatly trimmed ends can be butted tightly together.

Nailing

  • Nailing success has been achieved with 7d or 8d finish nails.
  • Stainless steel will provide the least amount of staining, although galvanized nails also work well.
  • Blind nail through the tongue at about 45 degrees
  • The nail must penetrate the joists
  • When face nailing within ¾” of the edge or end of the board, pilot holes are recommended to prevent splitting.

Ventilation

Ventilation is important.  Do not box in the deck underneath as the moisture underneath a boxed deck will be absorbed by the bottom side of the board.   The sun and wind will dry the top side of the board which will cause cupping.

  • Slope the soil underneath the porch away from the center
  • Install a moisture barrier on the ground underneath the porch. leave 2 feet of
  • Exposed soil around the perimeter under the deck.
  • Allow a ½” gap at the wall of the house. use trim board to cover.
  • Slope the deck ¼” per foot away from the house.
  • “Vent” (leave space around) columns/posts allowing for movement of flooring. if the flooring expands, it could move the posts.

Ventilation

Ventilation is important.  Do not box in the deck underneath as the moisture underneath a boxed deck will be absorbed by the bottom side of the board.   The sun and wind will dry the top side of the board which will cause cupping.

2 Responses to "Tongue & Groove Flooring Installation Recommendations"
  1. Thanks for sharing! Tongue and groove floor are fairly simple to install. They are typically made of oak, but they come in many different types of hardwood.

  2. Eric Clampit says:

    I am considering using treated plywood, with roofing tar paper on top to help me channel excess water away from decking area. Another reason for this is that the area has previously been a favorite den local of area ground squirrels ani really want to keep them away. I am installing a drainage systems to remove the excess water also. The location only gets direct sunlight during the early part of the day and is otherwise protected from adverse weather. The treated plywood will also create a very solid deck platform and makes it easier to create proper slope to drainage system. Any thoughts or comments are appreciated.

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