APA Residential & Commercial - Page 13

A. Siding

Siding shall be (specify appropriate grade):⁽¹⁹⁾

APA RATED SIDING EXT, or

APA MEDIUM DENSITY OVERLAY (MDO) EXT.

Spacing of 1/8" is recommended at panel ends and edges, unless otherwise indicated by the panel manufacturer. Nail panel siding 6" o.c. along panel edges and 12" o.c. at intermediate supports with 6d nonstaining ⁽²⁰⁾box, casing or siding nails for panels 1/2" and less, and 8d for greater thicknesses. ⁽¹⁰⁾

Nail lap siding installed over nailable  panel or lumber sheathing 8" o.c. along bottom edge, unless otherwise recommended by manufacturer. Nail lap siding installed direct to studs or over nonstructural sheathing at each stud. Use 6d constraining⁽²⁰⁾ box, casing, or siding nails for siding 1/2" thick, and 8d for thicker panels. If siding is applied over nonstructural sheathing, use next regular nail size. Use nonstaining box nails for siding installed over form insulation sheathing.

Prior to installing siding, apply building paper over studs when (a) lap siding is applied direct to studs, (b) square-edge panel siding is installed without battens or caulk  at vertical joints, (c) grooved panel siding is installed horizontally direct to studs, or (d) when required by local building or energy codes or by the siding manufacturer^.(6)

All panel edges should be sealed.  For panels to be paint,d sealer can be paint primer; for panels to be stained, sealer should be a water-repellent preservative compatible with the finish.

B. Soffits

Soffits shall be (specify appropriate grade):⁽⁵⁾

APA A-C EXT

APA B-C EXT

APA C-C P&TS EXT

APA RATED SIDING 303 EXT,⁽¹⁹⁾ or

APA MEDIUM DENSITY OVERLAY (MDO) EXT.⁽²¹⁾

Nail 6" o.c. at supported panel edges and 12" o.c. at intermediate supports, with 6d nonstaining ⁽²⁰⁾ box, casing, or siding nails for panels 1/2" and less, and 8d for thicker panels up to 3/4".

CSI Division 9- Finishes (Painting)(19)

A. Preparation of Surfaces

1. Exterior Panels-Panels to be exposed outdoors shall have all edges sealed. With paint, sealer may be a liberal coat of exterior house paint primer. With stain, seal with water-repellent preservative compatible with finish coat.

Surface shall be clean, dry and free of loose wood fibers.

2. Interior Panels: Surface shall be clean, dry and free of loose wood fibers. Holes and cracks shall be filled with putty or p[plastic wood (except for rustic type panels intended for stain finish).

After dry, sand lightly in the direction of the grain of face veneer or texture to match existing surfaces.

Any tree pitch or sap spots shall be first touched up with a sealer.

B. Application of Finish

(Specify by brush, roller, or spray; brush application of the first coat gives best performance.)

Exterior Panels- Painted

First coat: Exterior stain-blocking primer as recommended by manufacturer of finish coat. (May be tinted.) Apply quantity as recommended by paint manufacturer:

Second coat: Top-quality exterior all-acrylic latex house paint designed for use with primer; color as selected. Two topcoats provide better performance.

Exterior Panels - Stained

First coat: Top-quality exterior penetrating semitransparent soil stain where grain showthrough is desired ⁽²²⁾; or heavily pigmented solid-color oil or latex stain where grain is to be masked ⁽²³⁾; color as selected. Apply in one or two coats as recommended by manufacturer.

Use stain-blocking primer with light colored solid-color latex stains.

Interior Panels-Painted

Firs coat: Stain-blocking primer as recommended by manufacturer of finish coat.

Second coat: Flat, semi-gloss or gloss topcoat designed of use with primer color as selected. Use tow topcoat need to cover.

Interior Panels - Color Tone

First Coat: Stain and companion sealer mixed to selected color (or sealer, then stain applied separately).

Second coat: Interior satin varnish (additional coats can be applied as desired for depth of luster).