What size floor joists should i use

What is the best solutions. Hello, I bought my parents house, I was born here. The builders of the house used no sub flooring. The tongue and groove wood flooring is nailed to the joists. Can I install sub flooring over it? Was it common to find these houses with no sub flooring? I am putting on a flat roof span 3. Putting in box headers to reinforce a host the needs to be notched. I am replacing subfloor in a bathroom due to some water damage.

I used a toe kick saw to remove the damaged subfloor. I know I need to add blocking around the edge to secure the new subfloor to. The reason I ask is because the addition that was put on has a floor height that was not correct it ended up that the floor height in the addition was two inches higher than the rest of the floor giving me a ramp between the new and existing. If you wanted to reduce the width or vertical cross section of the joists you should measure the width of joist you need to make the floors even and adjust the span to accommodate that joist size.

The walls are std concrete block. As well as human traffic. The initial ground floor space of building is a work shop area for auto and wood crafts. What wood type and dimensions would be recommended to make this addition?

Build a house 2nd floor inside a block house which has a fl code truss roof and no windows. Certainly a lot of post. Or would steel be better placed as center and side columns? Hi, Jarred! Can I put a soaker tub in there without danger of too much weight after filled with water. Hi, Frank, Great question! He will contact you soon to discuss featuring it during an upcoming show. Take care! It might be smart for me to get more floor trusses to increase its strength.

Step 5] Install 6mm vapour barrier over the entire floor, staple to top of floor joists. Step 6] Install the plywood floor and nail into place. If the weather is rainy you can tarp off the floor to keep the insulation from getting wet.

Not as common for use in small structures and are mostly used in large wood frame buildings and houses. These are designed to span greater distances then normal floor joists and are engineered for the project.

There joist spacing is typically 16 inches on center. Pressure treated and treated lumber is only treated to protect against rot and it does not affect the bearing capacity or the joist spacing.

Follow the same guidelines for regular not treated floor joists. Using 24 inch centers on the floor is a poor choice and the floor will sag between the floor joists. I hope you have found this article helpful and be sure to share it. Thanks for reading. This is also true of trees within the same species—when conditions cause slow growth, the lumber from the tree will be stronger.

Common species used in-house framing include:. The fewer defects contained in a piece of lumber, the stronger it will be. Higher grades of lumber clear, select, or 1 have fewer flaws, and will, therefore, be stronger. A common choice for construction framing is 2-grade lumber. While not as strong as the higher grades, the flaws in 2-grade lumber are generally not enough to seriously weaken the boards. Avoid using 3- or 4-grade lumber for structural framing applications.

If you are hand-picking boards, examine them for knots and other flaws. The strength of a given joist board is most dramatically affected by the board's top-to-bottom width. The width is considerably more important than the thickness of a board. For example, a joist made from doubled 2 x 6s can span a distance about 25 percent more than a single 2 x 6, but a 2 x 12 can span about 80 percent more than a 2 x 6, even though it has the same amount of wood as a doubled 2 x 6.

Joist span is also governed by the weight placed on the floor. Floor loads are described using two measurements: dead load and live load. Dead load for residential construction is generally considered to be about 10 pounds per square foot. You can also download this excellent pdf span table guide includes C16, C24 and I-joists 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.

Unless C24 timber is specified, the more generally used timbers are less expensive C Size of joist mm.