Roof Deck Design Height Limit

In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.

Roof deck design height limit.

A 2x8 up to 12 feet. 4 maximum gap between balusters. Treads must be at least 10 inches deep measuring from front to back. Good for short span conditions for use when metal deck is used as a leave in place form composite deck 3 inch depth 32 inch coverage 11 foot to 15 foot optimal span range pan perforated acustadek option available with smooth series rivet attachments or welded.

There is a height limitation of 15 feet. Roofs are under a lot of pressure. The larger the deck the larger the joists. 34 minimum stair rail height from nosing to top of rail.

50 lb concentrated load over 1 sqft or balusters. 200 lb concentrated load. 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. 2x10 to 15 feet and 2x12 to 18 feet.

The dca6 recommends minimum 6x6 posts with a maximum 12 foot height. 50 lbf vertical and horizontal load along top rail. 36 minimum height when surface is 30 above grade. If bracing is used a maximum post.

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. The code has some very specific requirements for deck stairs. Load limits on the roof of a building. If larger than 400 square feet it requires frost line footings.

If in one 100 year floodplain the structure must be firmly anchored. 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.