Web Reference: Trying to determine how far apart your deck balusters should be? Calculate the number of balusters for each railing section and get measurements on where to place them at Decks.com. Calculate how many balusters you’ll need for a deck or stair railing by selecting the total railing length, the number and size of posts, and the size of the balusters. Calculate baluster spacing and layout by entering the baluster size and the length of each section of the railing. Spacing & Quantity: To meet the 4″ ball rule required by most building codes, space these spindles every 6 1/4″ On Center. To determine quantity required, take your rail length in inches and divide by 6.25.
YouTube Excerpt: In this video, This Old House general contractor Tom Silva shows host Kevin O'Connor a quick, simple trick for
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