1st Floor Ceiling Joist Depth

Enter a span for the joist.

1st floor ceiling joist depth.

Most lay outs are on 16 so the field is pre selected. Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor. The lowest is a plain ceiling joist with no storage 10 pounds per square foot. To change it click on another option.

This is the distance between joist centres. There is extremely little difference between the old span tables and the new ones. This is how far apart they will be. I d suggest you first run a continuous 1 by or 2 by plate across the ends of the existing joists to provide a stable base for the new joists.

The bulk of the floor s thickness comes from the joists which are the horizontal beams that carry the floor s weight. Joists must exhibit the strength to support the anticipated load over a long period of time. Joists in home construction are usually made with 2 by 10 or 2 by 12 lumber. Standard floor thickness however is substantial in order to provide the strength necessary for bearing the weight of the walls the ceiling and the roof.

The weight of the timber floor itself consists of the timber joists the plasterboard ceiling underneath it except for suspended timber ground floors the floorboards and the nails or screws used to fix both of the aforementioned coverings. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size. But larger is not always better when builders are constructing a home or adding a room addition. That also gives you a fighting chance at a level floor.

Select the on center spacing for the joists. Ceiling joists are usually installed either 16 or 24 inches on center which means roughly 16 or 24 inches apart. The highest is a fully loaded floor 70 pounds per square foot. If you simply set the new joists on the old they probably won t mate well and any slope in the old floor will translate through to the new.

The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example. If you re figuring the total height of a house the thickness of the floor will depend mostly on the size of the joists. Once you ve located the first one the others are easier to find.