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3413Wood Fence Posts (Treated)

MN · 2025 Standard Specifications✓ Full text on BuildSpecBook pages 956–0 Save this section

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3413.1SCOPE

Provide preservative treated wood posts for fence construction.

3413.2REQUIREMENTS

A Species of Wood Provide posts cut from live, growing trees and made from Northern White Cedar or any species of Pine, except Lodgepole Pine. B Seasoning Air-season or otherwise condition wood posts to allow penetration of the preservative. C Manufacture C.1 Peeling Shave off inner bark and closely trim knots before treating. C.2 End Finish Cut the ends of posts square. If setting the post by driving, the Contractor may cut the larger end to a blunt point with a length no greater than 1 1/2 times the diameter of the pointed end. C.3 Dimensions Provide naturally round posts in the length and minimum diameter as required by the Contract. The Contractor may provide posts with a diameter at the small end no greater than 2 inches greater than the minimum diameter required by the Contract. C.4 Quality Do not use wood with any of the following defects:

(1)Knots that impair the post strength
(2)Short kinks, defined by a line drawn between centers of the butt and tip falling

outside the center of the post by more than 2 percent of the post length

(3)Checks wider than 1/4 inch
(4)Unsightly and exaggerated winding twists
(5)Decay, except Northern White Cedar may contain one pipe rot no greater than

1/4 inch in diameter

(6)Butt rot and ring rot totaling greater than 5 percent of the butt area in

Northern White Cedar

(7)Defects that affect the appearance or impair the strength or durability of the

post as determined by the Engineer

D Preservative Treatment Treat posts in accordance with 3491, “Preservatives and Preservative Treatment of Timber Products.” Cut, trim, and point ends before treatment. Provide treated posts with a dry surface and free from dripping or excess preservative.

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Source: Minnesota Standard Specifications for Construction, 2025 Edition. Pages 956–0 of 1,081. View official source ↗

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