Lesson 3.2 Subflooring
1-12. Plywood Subflooring.
After the foundation and basic framework for the floor are completed, the subfloor can be installed. Material for constructing the subfloor can be either 1-inch or 2-inch material. Plywood is very satisfactory for subflooring because of the large sheets which can be installed rapidly. The thicknesses required are 1/2-, 5/8-, or 3/4-inch, depending on the joist spacing and the floor load requirement.
- Lay sheets with the face grain at a right angle to the joist when installing plywood.
- Lay the sheets so that the joists are placed over the joists.
- Arrange plywood so that the joints for the complete floor are staggered (see Figure 1-24 ).
- Glue and nail the plywood in place.
Figure 1-24. Plywood subflooring
1-13. Diagonal Subflooring.
Lay diagonal subflooring on the joist framework and nail it in place (See Figure 1-25 ). Subfloor material can be either 1-inch or 2-inch material.
- Lay the subfloor before the walls are framed.
- Square the ends of the boards before nailing when laying the flooring.
- Place the ends of the boards before nailing when laying the flooring.
- Use at least three nails per joist for boards 8 inches wide or more.
Figure 1-25. Diagonal subflooring