Installing railing posts on elevated chamferred bases

I am looking for the company that built a railing system in Seattle Madrona neighborhood that uses 6x6 cedar posts, drilled through the center to accommodate a 3/4 inch all thread anchor bolt.

This system was designed for a waterproof deck and the posts sit on top of a chamferred block with the entire block covered with the waterproof membrane.

I would appreciate any assistance!

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May 12, 2011
Good waterproofing technique for posts
by: Editor-Rich Bergman

What you are describing is a common and established waterproofing method for securing surface mounted posts to decks that have been covered with vinyl decking membrane or other waterproofing material.

By setting a pyramidal shaped square elevated platform - chamferred as you refer to it - you reduce the amount of water that might otherwise pool nearby the post base and in vicinity to the fastener penetration holes through the deck. The elevation and the sloping encourages water egress around the post base.

The sloping also allows the membrane to be wrapped and glued over it easily.

This is not unique to any specific brand of post anchor or rail system but something which good engineering and good deck construction techniques adhere to.

But if anyone is aware of the specific railing system, please chip in and help out.

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