Published at Thursday, June 14th 2018, 22:21:38 PM by Doreen Beich. Stair
Over the past several years, much has been done to address deck and stair safety issues, but we still have a long way to go. One glaring example of the failure in deck and stair safety protocol is the industry standard of permitting "hot dipped galvanized" anchors, screws, hangers and other hardware to be in direct contact with ACQ, pressure treated wood. The galvanic corrosion created between the high copper content of the wood and the galvanizing is so severe that the normal industry standard of G90 galvanizing will corrode in as little as 12 months and G185, such as Z-Max® can be gone in 24 months. The industry (including code officials) has adopted G185 as a fall back position with no engineering testing available to substantiate the validity or longevity of this adoption...this is a "knee jerk" reaction and is an accident waiting to happen. Without a barrier between the pressure treated wood and galvanized hardware, serious corrosion is inevitable.
Attention is now being given to the ability of the vertical post’s strength when hit by various degrees of lateral thrust pressure. These new directives, requiring the vertical rail post to support a minimum of 200 lbs. of lateral thrust, is making engineered stair systems extremely popular, with their ability to withstand over 500 lbs of lateral thrust for the ’rail post support’ structural sections of the overall decking plans.
Copyright © 2018 montlaker.com.
All contents published under GNU General Public License. All rights of images and videos found in this site reserved by its respective owners. All trademarks mentioned belong to their owners, third party brands, product names, trade names, corporate names and company names mentioned may be trademarks of their respective owners or registered trademarks of other companies and are used for purposes of explanation and to the owner’s benefit, without implying a violation of copyright law.