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The two most common sizes used for deck posts are 4×4 and 6×6. When using 4×4 posts, place them no more than 6 feet apart, and when using 6×6 posts, no more than 8 feet apart. The reason for these standards is that the railing system won't have proper support if the posts are too far apart.

Aluminum Railing Construction Durarail's framework uses the 6063-T5 alloy and the posts are made of the even stronger 6005A-T61 alloy.

Plan Your Railing To Meet Post Spacing Code The answer depends heavily on the size and material of the posts and rails you're using. But in general, most posts (including 4x4 wood posts) can only be 6 feet apart, while some stronger systems (or 6x6 wood posts) can span up to 8 feet between posts.

Aluminum Railing Construction Durarail's framework uses the 6063-T5 alloy and the posts are made of the even stronger 6005A-T61 alloy.

And because aluminum is a non-ferrous metal (i.e. a metal without iron), it is rust and corrosion-free by nature. Cost: When comparing aluminum with stainless steel railings, aluminum deck railings are more cost effective from the beginning.

Actual dimensions Available in 6' or 8' lengths and 36” or 42” Rail height for horizontal and stair applications.

What are the post dimensions? We have our Stair Line Post 1 3/4″ x 1 3/4″ with 4″ x 4″ base plate, our Scenic & standard posts are 2 1/2″ x 2 1/2″ with 4″ x 4″ base plate as well as a 3″ x 3″ Privacy/Windwall post with 5″ x 5″ base plate, and our 4″ x 4″ Maxum post with 6″x 6″ base plate.

For a residential property, the required rail height is 36” and for commercial or multifamily properties it's 42”.