303 Siding Manufacturing Specifications - …

1 B840 for pdf 5/21/01 4:05 PM Page 1. D A T A F I L E. 303 siding manufacturing specifications 1. Scope Panel Repairs Wood Decorative Treatment Wood repairs shall be subject to Face plies must have some form of deco- The provisions of this specification Glueline Quality Control Procedures for rative treatment which may be in the represent minimum requirements that Wood Panel Patches for APA 303 Series form of overlaying, rough texturing, plywood panels must meet to qualify Specialty Siding Panels. grooving, embossing, striating, brushing, for classification as APA 303 Series Wood panel repairs shall be placed with or scratch sanding. Scratch sanding is Specialty Siding .

2 Grain of the patch parallel to the grain of surfacing in a standard sander without the face. oscillation using a coarse paper. Smooth 2. Gluebond sanding is not permitted. Decorative Plywood shall meet the gluebond Panel Repairs Synthetic treatment skips are not permitted except requirements for Exterior type plywood, Panel repairs shall be made with as may occur in repair of voids at bottom as defined in the most recent edition of approved synthetic patching materials of grooves. Rough texturing shall be Product Standard PS 1 for Construction in a manner that simulates a natural perpendicular to the face grain direction. and Industrial Plywood.

3 Defect shape. Faces shall be bonded to the panel with Multiple synthetic patches shall not tight side out. 3. Veneer Grade and Workmanship exceed 2-1/4 inches in maximum width Except where purposely arranged for General Requirements (as measured in narrow dimension) and decorative effect, veneer joints in panel Veneer grade and workmanship the patch shall fall fully within the faces shall not exceed two per panel in provisions of the most recent edition of boundaries of a rectangle four inches Special Series 303-OC, and joined pieces Product Standard PS 1 for Construction wide by seven inches long with side shall be reasonably matched for color and Industrial Plywood, C-C grade, parallel to the panel edge.

4 When used as faces in Special Series 303. Exterior type, apply except as modified Stain and 303-6 and joints shall be parallel to by this specification . Stain from glue smears or bleed-through panel edges within 1-1/2 inches. Special face grade provisions shall be or from Manufacturing -related sources Overlays those listed in Table I. Openings in face such as trademarking ink shall not be Overlays shall be approved PS 1 Medium veneers used for three- and four-ply pan- permitted. Density Overlays or approved PS 1. els are limited to splits up to 1/16 inch Stain from synthetic repair overfill shall Special Overlays that meet Medium wide and other openings up to 1/4 by be limited to that which assumes the Density weatherability and durability 1/2 inch.

5 Pin knots are tight knots shape of the defect being repaired and acceptance criteria. 3/8 inch or less in diameter. Limitations within 1/2 inch of the defect edge. on grade characteristics are based on Core Gaps and Laps 4. Species four by eight-foot panel size. Limits Core gaps in veneer used adjacent to Species covered by this specification on other sizes vary in proportion. faces shall not exceed a maximum width are those listed in PS 1, except other Veneer Repairs Wood of 3/4 inch. Every effort shall be made to species may be used as given below. All wood veneer patches shall be neatly produce closely butted core joints. Laps in plies adjacent to faces are prohibited.

6 Panels classified for species group made, taper to a point and be placed through panel property testing in with grain of the patch parallel to accordance with PS 1 as permitted the grain of the face. A P A. T h e E n g i n e e r e d Wo o d A s s o c i a t i o n 1997 APA - The Engineered Wood Association B840 for pdf 5/21/01 4:05 PM Page 2. for Decorative grade may be used for the plane of the face may occur within a Siding panels intended for 303 Series Siding subject to the core veneer. Any openings 1/16 inch or direct application to studs spaced following condition: more in dimension intersected in the 16 inches shall conform to the Only species listed in PS 1 shall be core veneer shall be solidly filled with an following requirements.

7 Panels meeting used for crossbanding when qualifying approved synthetic patching material. the requirements of also qualify for Span Ratings by meeting require- Where grooves are wider than for direct application to studs ments of Section or 3/8 inch, any voids at the base of grooves spaced 24 inches Species otherwise not provided for in shall be solidly filled with an approved Panels shall have an average thick- PS 1 may be used in APA 303 Series synthetic patching material or be patched ness of not less than 5/16 ( ) inch Siding panels subject to the following with wood repairs subject to Glueline in any 16-inch width. conditions: Quality Control Procedures for Wood When two crossband layers remain Panel Patches in APA 303 Series intact, the minimum thickness of cross- Species group assignment shall be Specialty Siding Panels.

8 Banding shall not be less than 1/16-inch established in accordance with proce- dures established for PS 1 species group- Group 1, 2, or 3 species. 7. Span Rating ing when such group assignments will When only one crossband layer govern use of the species for crossband- Siding panels shall qualify for Span remains intact, the requirements of ing as covered by this specification . Ratings by meeting the requirements Table III shall apply. Panels manufactured with unlisted of Section or Siding panels intended for direct species for faces shall be identified by Alternatively, panels may qualify for application to studs spaced 24 inches the common name for that species and Span Ratings by performance testing in shall conform to the minimum there shall be no reference to PS 1 accordance with the requirements of requirements of through in the panel trademark.

9 Manufacturing and Performance Standard or the special conditions of for APA Rated Siding Panels. Additionally, Panels shall be minimum four-ply 5. Panel Construction such performance tested panels, except construction. Four-ply panels shall not for lap Siding , must meet wall racking exceed 5/8 inch in nominal thickness Panel construction shall conform criteria for sheathing as given in Manufac- and texturing shall not extend into the to Table II: turing and Performance Standard for APA inner layer. Panels of five or more plies Rated Sheathing Panels. Thickness at the shall have at least two crossband layers TABLE II. Finished Panel point of nailing shall be that at the base remaining intact.

10 Nominal Minimum Minimum of grooves at panel edge (if grooved). Thickness Number Number Minimum net panel thickness at Range (inch) of Plies of Layers unless otherwise recommended by the any point shall be 13/32 ( ) inch Through 3/8 3 3 manufacturer, and shall determine (no minus tolerance). Over 3/8, test load requirements. through 5/8 4 3. Over 5/8, through 7/8 5 5 TABLE III. Minimum Net Panel No. of Min. Species Minimum Over 7/8 6 5 Thickness at Any Point Plies Group of Thickness Item After Face Treatment in Crossband of Crossband No. (no minus tolerance) Panel Remaining Intact Remaining Intact 6. Grooves 1. 9/32" (.281") 3 1 1/6". 2. 9/32" (.)