âI think whatâs changed a bit over the years is â over time, the concentration of the active ingredient, THC, has increased dramatically in the marijuana that is available for people to smoke,â Ball said in a video.
Exterior residential entrance steps are usually about 7 inches high, so a porch with more than 2 steps would be about 21 inches high. Most building codes require a 36 inch high guard (railing) if the change in level is 30 inches or more.
In this video, This Old House general contractor Tom Silva explains how to install a stair handrail. Steps: 1. Stand 4-foot level on first step and hold it plumb. 2. Mark the level where it meets top of second step. 3. Calculate height of handrail and mounting brackets; mark bracket height on level.