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Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: Durability of Hardboard Lap Siding

Source: USDA Forest Service, Forest Products Laboratory, Research Paper, FPL-RP-674, 2013; 29 p.

Author(s)Carll, Charles; Boardman, Charles R.; Verrill, Steve P.

Publication Year: 2013  View PDF »

Category: Research Papers
Associated Research Project(s):   FPL-4723-1B  FPL-4851-1B

Abstract: This paper describes a study that was undertaken to evaluate the degree of correlation between in-service performance of hardboard siding and its performance in the industry standard test procedure for “weatherability of substrate.” The study included 13 different hardboard sidings: 6 noncommercial boards and 7 commercial products. All manufacturing plants operating in the United States in 1996–1997 were represented in the study. Twenty replicate specimens of each of the 13 different boards were exposed on the south side of an unconditioned building near Madison, Wisconsin, for 155 months (almost 13 years). Although the climate at the exposure site was less challenging with regard to rainfall or decay hazard than most locations in the eastern United States, paint coating on test specimens was only about half as thick as recommended. Two failure modes were observed in service, drip-edge paint cracking and edge welting, although paint condition on board faces remained essentially perfect throughout the exposure period. With regard to the two observed failure modes, substantial differences were observed among the 13 sidings. Relative frequency of the two failure modes was related to residual thickness swelling (RTS) value of the board, as identified by the substrate weatherability test procedure. Lower RTS values were associated with lower relative frequency of failure and lower relative frequency of more intense failure. In general, there was no “plateau” value below which further reductions in RTS were not associated with greater relative frequency of improved in-service performance.

Keywords: Hardboard siding; long-term exposure; durability; edge welt; drip edges

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 959 kb(s)

Date posted: 09/30/2013

This publication is also viewable on Treesearch:  view
RITS Product ID: 66264
Current FPL Scientist associated with this product
Verrill, Steve P.
Mathematical Statistician

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