Floor Support Joists

The wall could be either a properly sized structural concrete or concrete block wall or a wood framed wall.

Floor support joists.

The joist support helps reinforce the floor so it can handle the weight load it needs to. Span tables and tables that show design limits for particular lumber types allow you to determine whether a given floor design will meet code and design requirements. Span tables use these tables to determine rafter span ceiling joist span and floor joist span. Plenty of trial and error plus a healthy dose of engineering and testing have gone into the official rules in the building code.

According to section r502 4 of the 2009 edition of the international residential code joists under parallel load bearing walls must be big enough to support the weight of the load they bear. This is especially true if you are planning on getting a grand piano or something of the same caliber. Here we ll examine the rules. Still when framing a raised floor it s easier to think of floor joist spacing in terms of 12 16 or 24 inches on center because each joist is positioned along the header according to its center point.

We ll discuss these. Find jack posts at lowe s today. This article provides step by step instructions and pictures on how to make structural repairs by sistering floor joists alongside weak joists. This support could take the form of a structural wall.

This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.