Using the most current Concrete Form HDO technology, our Crown Alkamax employs a proven Melamine HDO that can better stand up to high-alkalinity concrete mixes and is the most durable panel in the Crown Performance Panel product lineup.

Features & Benefits

Crown Alkamax is constructed with high strength Douglas fir inner plies with smooth, durable hardwood face and back veneer. The high resin content Melamine HDO is applied in a one-step process. All adhesives used are fully waterproof phenolic resins that meet APA exterior glue bond standards.

Available in 48” x 96” and 24” x 96” in 5/8” to 3/4” thickness

  • APA Certified Panel
    Crown Alkamax Hardwood panels are engineered to be Struc-1 equivalent and meet or exceed APA’s PS 1-09 for HDO Concrete Form.

  • Melamine HDO
    Crown Alkamax Melamine HDO provides the highest level of alkaline resistance of any Crown Performance Panel.

  • Hardwood Face and Back
    A durable hardwood veneer is used for the face and back providing a smoother pouring surface and a more durable panel than traditional softwood panels.

  • Two Piece Inner Plies
    Our two piece, Douglas fir inner ply construction method is engineered to provide a more solid panel that can better stand up to job site wear and tear.

  • Multi-Layer Edge Protection
    For additional moisture protection, all panels are edge puttied and then coated with a silver, aluminized, resin-rich alkyd edge seal.

  • Factory-Applied Release Agent
    For safety reasons, Crown Alkamax does not come factory coated with release agent. Prior to each use, application of Nox-Crete or equivalent release agent is required.

    See Care & Handling for more information

Load-Span Tables

Allowable pressure (psf) for the indicated deflection limits for indicated thickness – Wet Conditions

Span 5/8″ 11/16″ 3/4″
L/270 L/360 L/270 L/360 L/270 L/360
8″ 1955 1955 2055 2055 2230 2230
12″ 1045 780 1255 945 1380 1045
16″ 475 355 585 440 665 495
19.2″ 280 210 350 265 405 300
24″ 145 110 185 140 215 160

8′ Perpendicular to supports
Span 5/8″ 11/16″ 3/4″
L/270 L/360 L/270 L/360 L/270 L/360
8″ 1305 1305 1515 1515 1655 1655
12″ 805 605 940 815 1025 1025
16″ 340 255 465 350 605 455
19.2″ 240 180 300 250 375 325
24″ 120 – 170 125 225 170

8′ Parallel to supports

Note: Applicable for plywood across two or more spans, and on supports at least 1.5″ wide
Load Tables developed by APA: The Engineered Wood Association

Features & Benefits

Crown Alkamax is constructed with high strength Douglas fir inner plies with smooth, durable hardwood face and back veneer. The high resin content Melamine HDO is applied in a one-step process. All adhesives used are fully waterproof phenolic resins that meet APA exterior glue bond standards.

Available in 48” x 96” and 24” x 96” in 5/8” to 3/4” thickness

  • APA Certified Panel
    Crown Alkamax Hardwood panels are engineered to be Struc-1 equivalent and meet or exceed APA’s PS 1-09 for HDO Concrete Form.

  • Melamine HDO
    Crown Alkamax Melamine HDO provides the highest level of alkaline resistance of any Crown Performance Panel.

  • Hardwood Face and Back
    A durable hardwood veneer is used for the face and back providing a smoother pouring surface and a more durable panel than traditional softwood panels.

  • Two Piece Inner Plies
    Our two piece, Douglas fir inner ply construction method is engineered to provide a more solid panel that can better stand up to job site wear and tear.

  • Multi-Layer Edge Protection
    For additional moisture protection, all panels are edge puttied and then coated with a silver, aluminized, resin-rich alkyd edge seal.

  • Factory-Applied Release Agent
    For safety reasons, Crown Alkamax does not come factory coated with release agent. Prior to each use, application of Nox-Crete or equivalent release agent is required.

    See Care & Handling for more information

Load-Span Tables

Allowable pressure (psf) for the indicated deflection limits for indicated thickness – Wet Conditions

Span 5/8″ 11/16″ 3/4″
L/270 L/360 L/270 L/360 L/270 L/360
8″ 1955 1955 2055 2055 2230 2230
12″ 1045 780 1255 945 1380 1045
16″ 475 355 585 440 665 495
19.2″ 280 210 350 265 405 300
24″ 145 110 185 140 215 160

8′ Perpendicular to supports
Span 5/8″ 11/16″ 3/4″
L/270 L/360 L/270 L/360 L/270 L/360
8″ 1305 1305 1515 1515 1655 1655
12″ 805 605 940 815 1025 1025
16″ 340 255 465 350 605 455
19.2″ 240 180 300 250 375 325
24″ 120 – 170 125 225 170

8′ Parallel to supports

Note: Applicable for plywood across two or more spans, and on supports at least 1.5″ wide
Load Tables developed by APA: The Engineered Wood Association

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USA – CROWN Ax – OCT 2022

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