Work Item
ASTM WK65136

Revision of C1063-18b Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster

Keywords

None Provided

Rationale

The currently indicated wood framing and wood-based structural panel moisture content levels in C1063 conflict with extensive research published by the Forest Products Laboratory which recommends: Moisture content (MC) in excess of 20% is a major predictor of performance problems with wood and wood products, influencing their susceptibility to fungal and insect infestation and the susceptibility of fasteners embedded in them to corrosion. High MC and repetitive, large fluctuations in MC are also implicated in creep deflection. To prevent these deleterious effects and to provide for the long service life of solid wood in use, an MC of 20% or less has therefore long been recommended. This level is approximately the equilibrium MC value of wood at 90% relative humidity and room temperature. It corresponds with approximately 19% MC in construction plywood and 17% MC in oriented strand board.

Details

Developed by Subcommittee: C11.03

Committee: C11

Staff Manager: Stephen Mawn

Work Item Status

Date Initiated: 09-14-2018

Technical Contact: Jeff Bowlsby

Item: 001

Ballot: C11.03 (18-06)

Status: Will Reballot Item

Item: 001

Ballot: C11 (21-02)

Status: Will Reballot Item

Item: 002

Ballot: C11 (19-02)

Status: Will Reballot Item

Item: 015

Ballot: C11 (19-05)

Status: Will Reballot Item

Item: 011

Ballot: C11 (20-01)

Status: Will Reballot Item

Item: 001

Ballot: C11.03 (22-01)

Status: Negative Votes Need Resolution