Section Contents

APA Plywood Panel Grades for Specific Applications

There are two ways to identify APA plywood panels:

  1. The type of veneer grade identified on the trademark refers to the grades on face and back of the panel e.g. A-C or B-B.
  2. Information given here on the panel’s end use application such as:
APA Rated Sheathing APA Rated Sturd-I-Floor
APA A-B APA A-C
APA B-B APA B-C
APA C-C Plugged APA C-D Plugged
APA 303 Siding APA T1-11®
APA High Density Overlay (HDO) APA Medium Density Overlay (MDO)

APA Rated Sheathing

Unsanded panels specially designed for structural subfloor decking, wall and roof applications.
Other significant uses are shipping crates, pallets & pallet bins, shelving and partitions, as well as a range of industrial applications.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

 

Veneer Grades

 

Face

 

Inner

 

Back

3/8
15/32
1/2
19/32
5/8
23/32
3/4

0.354 IN (8.99)
0.451 IN (11.46)
0.483 IN (12.27)
0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)

 

Exposure 1   

C

D

D

Exterior

C

C

C

APA Rated Sturd-I-Floor

Specially designed floor panel with smooth surface for carpet and high impact and concentrated load resistance. Available with square or tongue-and-grooved edges.  Normally touch sanded.  Plywood Sturd-I-Floor may also be available with a sanded face.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

 

Veneer Grades

 

Face

 

Inner

 

Back

19/32
5/8
23/32
3/4
1-1/8

0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)
1.091 IN (27.72)

 

Exposure 1

C
plugged

C1,D

D

 

Exterior

C plugged

C1

C

Note:
Special knothole size restrictions apply to ply adjacent to face to resist indentation from concentrated loads

APA A-B

Provides two solid sanded surfaces for applications where appearance of one side is less important than the other such as high appearance hoarding, signboards, shipping containers, shelving, ducts and cabinets.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

 

Veneer Grades

 

Face

 

Inner

 

Back

1/4
11/32
3/8
15/32
1/2
19/32
5/8
23/32
3/4

0.234 IN (5.95)
0.328 IN (8.33)
0.359 IN (9.12)
0.453 IN (11.51)
0.484 IN (12.30)
0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)

 

Exposure 1

A

D

B

Exterior

A

C

B

APA A-C

For exterior applications where the appearance of only one sanded side is important, such as soffit boards, high quality appearance hoarding, lorry cargo space linings, farm buildings and commercial refrigerators.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

 

Veneer Grades

 

Face

 

Inner

 

Back

1/4
11/32
3/8
15/32
1/2
19/32
5/8
23/32
3/4

0.234 IN (5.95)
0.328 IN (8.33)
0.359 IN (9.12)
0.453 IN (11.51)
0.484 IN (12.30)
0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)

 

Exterior

A

C

C

APA B-B

General purpose utility panel with two solid sanded sides.  With B-B Exterior both sides can be used for concrete forming (Plyform) to double panel usage.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

 

Veneer Grades

 

Face

 

Inner

 

Back

1/4
11/32
3/8
15/32
1/2
19/32
5/8
23/32
3/4

0.234 IN (5.95)
0.328 IN (8.33)
0.359 IN (9.13)
0.453 IN (11.51)
0.484 IN (12.30)
0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)

Exposure 1

B

D

B

 

Exterior

B

C

B

APA B-C

Utility panel with B-grade veneer face, sanded smooth.  Suitable for use on farm service and non-permanent buildings, cargo linings for rail cars and lorries, concrete formwork and agricultural bins.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

 

Veneer Grades

 

Face

 

Inner

 

Back

1/4
11/32
3/8
15/32
1/2
19/32
5/8
23/32
3/4

0.234 IN (5.95)
0.328 IN (8.33)
0.359 IN (9.12)
0.453 IN (11.51)
0.484 IN (12.30)
0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)

 

Exterior

B

C

C

APA C-C Plugged

Provides smooth surface for applications of carpet with high impact and concentrated load resistance.  For floor decking, refrigerated storage rooms, pallet bins, railcar and lorry floors and lining of their cargo areas,  soffit, tile backing, concrete formwork where smooth finish is not essential and other similar uses where continuous or severe moisture may be present.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

      
       Veneer Grades
Face     Inner   Back

3/8
1/2
19/32
5/8
23/32
3/4

0.354 IN (8.99)
0.483 IN (12.27)
0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)

 

Exterior

C
Plugged

C

C

APA C-D Plugged

For built-in storage units, walls and ceiling tile backing, cable reels, separator boards and other interior or protected applications.  Not intended for formwork, nor as a substitute for APA Rated Sturd-I-Floor because it lacks the necessary puncture resistance.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

      
       Veneer Grades
   Face      Inner  Back

3/8
1/2
19/32
5/8
23/32
3/4

0.354 IN (8.99)
0.483 IN (12.27)
0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)

 

Exposure 1

C
Plugged

D

D

APA 303 Siding

Textured, grooved or overlaid exterior panels used for cladding or fencing and made exclusively by APA member manufacturers.  Available in a variety of wood species.  When applied directly or through blocking to studs, the panels possess sufficient strength and shear wall racking resistance to eliminate the need for diagonal bracing.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

      
       Veneer Grades

 

Face

 

Inner

 

Back

11/32
3/8
15/32
1/2
19/32
5/8

0.322 IN (8.18)
0.354 IN (8.99)
0.451 IN (11.46)
0.483 IN (12.27)
0.578 IN (14.68)
0.609 IN (15.48)

 

Exterior

When 303-OL face veneer is B

Faces of other grades per 303 manufacturing specification

C

C

APA T1-11

This is a special APA 303 Siding (cladding) panel with grooves 6.4 mm (1/4”) deep, 9.5 mm (3/8”) wide, spaced 100 mm (4”) or 200 mm (8”) on centre or with other spacings in special order.  Available as unsanded, textured and MDO finish in a variety of species.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

      
       Veneer Grades
   Face Inner  Back  

19/32
5/8

0.578 IN (14.68)
0.609 IN (15.48)

Exterior

When 303-OL face veneer is B

Faces of other grades per 303 manufacturing specification

C

C

APA High Density Overlay (HDO)

Panel face and back coated with hard, semi-opaque resin fibre overlay highly resistant to abrasion.  For concrete forms, cabinets, countertops, laboratory bench tops, signs, industrial tanks.  Also available with skid-resistant screen grid surface suitable for pedestrian walkways.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

      
       Veneer Grades
   Face     
Inner
   Back

3/8
1/2
5/8
3/4

0.354 IN (8.99)
0.483 IN (12.27)
0.609 IN (15.48)
0.734 IN (18.65)

Exterior

 A  or  B

C2  Plugged

A  or B

Note:
May have C centre if five or more plies

 APA Medium Density Overlay (MDO)

One or both surfaces coated with smooth, opaque resin-fibre overlay, ideal base for paint, indoors or outdoors.  Suitable for shelving, factory work surfaces, panelling, signs, built-in storage units.  Specially manufactured MDO panels may also be used for concrete forming.  Also available as APA 303 Siding.

 

Performance
Category

 

Recommended Thickness
Label
(Figure in brackets is mm equivalent)

 

Typical APA
Trademark with Exposure Durability
Classification

 

Veneer Grades

 

Face

 

Inner

 

Back

11/32
3/8
15/32
1/2
19/32
5/8
23/32
3/4

0.322 IN (8.18)
0.354 IN (8.99)
0.451 IN (11.46)
0.483 IN (12.27)
0.578 IN (14.68)
0.609 IN (15.48)
0.703 IN (17.86)
0.734 IN (18.65)

 

Exterior

B

C

B or C

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All Questions OSBPlywood

What is a ‘life cycle stage’ and how do these link to the environmental assessment of whole buildings?

How do core category rules link with environmental product declarations?

Whose responsibility is it to check that wood products being imported into the EU do not originate from illegally sourced timber supplies?

Does the EUTR require mills to provide any extra documentation for customs entry into the European Union?

Must all plywood and OSB panels carry a CE marking?

What is the definition of a construction product under the CPR?

What is a Declaration of Performance referred to under the Construction Products Regulation?

What is the difference between Structural 1 and Exposure 1?

Does structural panel siding have shear values?

What are mould and mildew, and do they compromise the integrity of engineered wood?

The CE-mark on an APA plywood panel means it conforms to European Standards – but which ones?

I want to use a Rated Sheathing panel for flooring/ roofing application, what info do I need to know?

Plywood: Span rating
OSB: Span rating

What extra strength benefits do Structural 1 OSB panels provide over standard Rated Sheathing panels?

Do APA panels give off formaldehyde?

Plywood: Formaldehyde
OSB: Formaldehyde

What is the difference between a touch-sanded panel and sanded panel?

I’d like to know how APA veneer grades match those given in the European standards

How do I correctly gauge the face appearance a plywood Siding panel?

I want to specify an APA panel for concrete formwork – what do I need to know?

Are APA panels tongue and grooved on all four edges?

I am not familiar with the term ‘Sized for Spacing’ – what is its significance?

How are Performance Category and thickness related?

I’d like to know more about a panel’s Span Rating and how it links to thickness.

Plywood: Span rating
OSB: Span rating

What is Span Rating on the APA trademark and why is it important?

Plywood: Span rating
OSB: Span rating

What is the difference between Exposure 1 and Exterior plywood panels? What are their appropriate uses?

What are the main OSB panels likely to be available in Europe?

What are the main plywood panels likely to be available in Europe?

What are the main European standards that I would need to be aware of for OSB panels?

The main standards are: EN 13986 and EN 300

What are the main European standards that I would need to be aware of for plywood panels?

The main standards are: EN 13986, EN 636, EN 314, EN 635-3