Quality Specifications

Wood Quality

  • Master samples must be used to verify dimensional and aesthetic properties of the manufactured moulding and must be replaced every (3) years at minimum to ensure product does not exhibit color fade or damage due to UV exposure and handling.

  • Color should be verified using either spectrophotometer or Nix color sensor to ensure the manufactured moulding matches the master sample within a range of delta 3.

    • Test product should be verified in at least (3) spots on the moulding to ensure consistency.

  • Wood type changes must be tested and approved by Larson-Juhl quality and product development prior to implementation.

  • Product surface hardness should be tested during production using the proper standard pencil based on finishing top coat (e.j. 3H would correspond to Polyurethane) and should exhibit no scratches or indentations on the surface of the moulding. All moulded product should be delivered free of scratches and indentations.

  • Product must have a sheen reading that is no less than 5 from the Master sample.

  • All boxed moulding should consist of defect free or an assortment of defect and defect free moulding.

  • A maximum of 1/3 of the sticks per box may have a defect.

  • All defect allowances must be clearly marked on the stick in the defect area.

  • The rules and allowances for defects are:

    • Up to and including 1-1/4 inches (3.2cm) wide

      1/2 foot (1.3cm) billable allowance for any defects; No more than 2 defects per stick

    • Over 1-1/4 inches (3.2cm) to 2-1/2 inches (6.4cm) wide

      1 foot (0.3m) billable allowance for any defects; No more than 2 defects per stick

    • Over 2-1/2 inches (6.4cm) wide

      1 foot (0.3m) billable allowance for any defects; No more than 1 defect per stick

  • Material must not chip when cut by saw at 2,400 RPM.

  • Moulding should not fade or oxidize due to exposure to sunlight within (3) years

  • Mouldings should be delivered free of external contamination in product finish.

  • All mouldings must meet US Proposition 65 and European REACH standards for regulatory control.

  • All parts to have bar codes placed every (3) feet (code 39 or 128) centered on back of moulding for traceability purposes.

  • On finished sides of moulding, no finger joints may be visible unless approved as part of product design.

  • When joining finger joined lumber for mouldings, initial moisture content should be no greater than 8% for hardwoods and 10% for softwoods.

  • The individual finger joined lumber moisture content should fall within a 1% delta of each piece throughout the moulding to prevent warpage.

  • Product finish adhesion should be tested during production utilizing a cross-hatch adhesion test.

  • Product finish should not rub off with water, window cleaner, or use of cross-hatch adhesion test.

Warpage

Warp is any variation from a true or plane surface, which usually develops during drying. Warp includes bow, crook, kink, cup and twist or any combination thereof. Larson Juhl tolerance on warpage is as follows:

  • Tangential- A form of warp in which lumber deviates on the horizontal plane (width) which can be a bow, twist, kink, or crook in the wood.

    • Up to and including 1-1/4 inches (3.2cm) wide

      1/2 inch (6.4mm) per linear foot is the maximum acceptable bow from point of greatest deflection.

    • Over 1-1/4 inches (3.2cm) to 2-1/2 inches (6.4cm) wide

      3/8 inch (3.2mm) per linear foot is the maximum acceptable bow from point of greatest deflection.

    • Over 2-1/2 inches (6.4cm) wide

      1/4 inch (1.6mm) per linear foot is the maximum acceptable bow from point of greatest deflection.

  • Radial- A form of warp in which lumber deviates on the vertical plane (thickness) which can cause a cup in the wood.

    • Up to and including 1 inch thick (2.54 cm)

      1/2 inch (3.2mm) is the maximum acceptable bow from point of greatest deflection

    • Over 1 inch (3.2 cm to 2 inches (6.4 cm) thick

      3/8 inch (4.76 mm) is the maximum acceptable bow from point of greatest deflection

    • Over 2 inches thick (6.4 cm) thick

      1/4 inch (6.4 mm) is the maximum acceptable bow from point of greatest deflection

  • Longitudinal- Due to the general insignificance of shrinkage in this direction, there will be no specification, however Larson Juhl does reserve the right to classify as unacceptable in specific cases

Lumber Treatment Process

  • All purchased raw wood materials must be properly treated for woodworm infestation and kiln dried to a controlled moisture content of 8% or less for hardwood and 10% or less for softwood before finishing and shipping any product for a Larson-Juhl facility or customer.

    Any significant damages we receive or our customers receive due to woodworm or unusable warpage and twisting will be addressed with the supplier and debited according to our defective product chargeback process.

    Larson-Juhl reserves the right to inspect the lumber treatment process at our suppliers to ensure that proper controls are being used to comply to applicable standards.