Roof Deck Design Height Limit

Stair rails on decks should be between 34 inches and 38 inches high measured vertically from the nose of the tread to the top of the rail.

Roof deck design height limit. The larger the deck the larger the joists. If larger than 400 square feet it requires frost line footings. If located on a corner lot the structure must be situated in the half of the lot furthest from the side street. If in one 100 year floodplain the structure must be firmly anchored.

36 minimum height when surface is 30 above grade. 200 lb concentrated load. A 2x8 up to 12 feet. 2x10 to 15 feet and 2x12 to 18 feet.

The dca6 recommends minimum 6x6 posts with a maximum 12 foot height. 34 minimum stair rail height from nosing to top of rail. 50 lb concentrated load over 1 sqft or balusters. Load limits on the roof of a building.

Roofs are under a lot of pressure. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. The code has some very specific requirements for deck stairs. Treads must be at least 10 inches deep measuring from front to back.

In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above. 4 maximum gap between deck and underside of bottom rail. 4 maximum gap between balusters. There is a height limitation of 15 feet.

Internachi is more conservative in its recommendations which specify that posts should be no taller than 12 feet unless cross bracing is used between posts. If bracing is used a maximum post.