For handrails at one or more edges.
How to attach railing posts on a flat roof.
Mark for two holes in the posts that are each 1 inch from opposite sides of the post and 1 1 2 inches from the top or bottom of the joist.
Roofing contractors normally don t want to deal with the installation of post and railings.
When wooden posts are used for railing it is best to go with pressure treated 4 x 4 posts.
Once the plate and rod are installed i stand the post in place.
These posts should be fastened to the rafters with bolts and nuts.
Uncured rubber will flex enough to allow you to either seam it to the edpm rubber deck or attach it directly using adhesive meant for rubber.
Access the roof using an extension ladder.
Usually some scribing and fitting are needed to make it stand plumb without wobble or lean.
Staggering the holes avoids splitting the post along the grain lines.
To counterflash the uncured rubber you can either kerf the post and counterflash using copper or aluminum or box in your post thereby covering the post and rubber.
Normally a carpenter is best suited for this job.
How to attach railing posts to a flat roof.
Drill holes the same diameter as the carriage bolts you will use.
Here we show posts for a 36 inch tall railing which is common.
A schematic diagram of a post on a roof.
Measure from the edges of the roof and mark the line of the handrails at several points.