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Building Design and Construction Handbook - Merritt - Ventech!

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Panel<br />

siding<br />

Lap<br />

siding<br />

10.42<br />

TABLE 10.20 Recommended Installation of APA Rated Sturd-I-Wall<br />

Siding<br />

Description a<br />

APA MDO Exterior<br />

APA Rated Siding<br />

Exterior<br />

APA Rating Siding—<br />

Lap Exterior<br />

Nominal<br />

thickness, in,<br />

or span rating<br />

11 ⁄32 <strong>and</strong> 3 ⁄8<br />

15 ⁄32 <strong>and</strong> thicker<br />

16<br />

24<br />

16<br />

24<br />

Long<br />

dimension<br />

vertical<br />

16<br />

24<br />

16<br />

24<br />

Maximum stud<br />

spacing, in<br />

Long<br />

dimension<br />

horizontal<br />

24<br />

24<br />

a Recommendations apply to all species groups for veneered APA Rated Siding, including APA 303 siding.<br />

b Next regular size nailing should be used if panel siding is applied over foam-insulation sheathing. If lap siding is<br />

installed over such sheathing up to 1 in thick, 10d (3-in) nails should be used for 3 ⁄8- or 7 ⁄16-in siding, 12d (3 1 ⁄4-in) nails<br />

for 16 ⁄32- or 1 ⁄2-siding, <strong>and</strong> 16d (3 1 ⁄2-in) nails for 19 ⁄32-in or thicker siding. Nonstaining box nails should be used for<br />

siding installed over foam-insulation sheathing.<br />

c Hot-dipped or hot-tumbled galvanized steel nails are recommended for most siding applications, but electrically or<br />

mechanically galvanized nails are acceptable if the plating meets or exceeds thickness requirements of ASTM A641<br />

Class 2 coatings <strong>and</strong> is protected by a yellow chromate coating. For best performance, stainless steel or aluminum nails<br />

are an alternative. Galvanized nails may react adversely under wet conditions with some wood species <strong>and</strong> cause staining<br />

if left unfinished. Such staining can be minimized if the siding is finished in accordance with APA recommendations<br />

or if the siding is protected by a roof overhang from direct exposure to moisture <strong>and</strong> weathering.<br />

d Recommendations of siding manufacturers may vary.<br />

e Nails should be spaced 3 in c to c along panel edges for a braced wall section with 11 ⁄32- or 3 ⁄8-in panel siding<br />

applied horizontally over studs spaced 24 in c to c.<br />

ƒ Where wind velocity exceeds 80 mph, nails attaching siding to intermediate studs within 10% of the width of the<br />

narrow side from wall corners should be spaced 6 in c to c.<br />

g Stud spacing may be 24 in for veneer-faced siding panels.<br />

16 e<br />

24<br />

16<br />

24<br />

Nail size<br />

(nonstaining<br />

box, siding or<br />

casing nails) b,c<br />

6d for siding<br />

1 ⁄2 in thick<br />

or less;<br />

8d for thicker<br />

siding.<br />

6d for siding<br />

1 ⁄2 in thick<br />

or less;<br />

8d for thicker<br />

siding.<br />

At<br />

panel edges<br />

Nail spacing, d in<br />

At<br />

intermediate<br />

supports<br />

6 e 12 ƒ<br />

16 along<br />

bottom edge<br />

24 along<br />

bottom edge

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