6 Bathroom Remodel Structural Considerations
Out of Level Floors and Walls
While not always noticeable an out of plumb wall may show itself better when covered with tile and the grout lines taper off.
If you plan on installing shower glass doors and walls like Basco Shower Doors – you want to make your walls as straight and plumb as possible. On tip I use is to install solid surface strips, like granite or Silestone for the glass to butt to.
Deficiencies in the Floor Framing
The time to address structural floor issues, like reinforcing floor joists, is at the time it was built or during a retrofit or remodel.
Contractors may cut through floor joists to accommodate plumbing or HVAC mechanical equipment as long as they properly transfer the floor load to adjoining joists by adding headers.
Understanding the different types of basic framing methods will help you to identify load paths in homes built using different framing methods.
Being able to locate key point loads will also help you know where to look for structural problems. Homes are built to transfer the structural load down through the framing to the foundation.
This is called the “load path” and it’s where most of the weight forces in a home are concentrated. Point loads are loads that are concentrated in a small area, such as where a post supporting a beam or supporting a window header.
New floor system
Heading Off and Framing Floor Openings
In a perfect world any floor joist that is cut should have a header installed, preferably two and doubled adjacent joists. All headers should be nailed to the cut joists and their ends attached to two adjacent, uninterrupted floor joists.
The purpose of the headers are to transfer the floor load to the adjacent trimmer joists. The use of joist hangers facilitates this repair.
TIP: A single header nailed to the cut joist and two uninterrupted joists will work for openings less than 4 feet. If the header spans more than 4 feet, both the header and the trimmer joists should be doubled. We often refer to doubling up of joists or other structural framing as “sistering,” or “reinforcing.”
The doubled trimmer and header joists must be nailed together properly with spaced pairs of 16d nails every 16 inches so that they are reinforcing Floor Joists like beams.
Reinforcing floor joists is best done by doubling of floor joists. Doubling of joists is recommended under walls, heavy objects like tubs and at large openings. Doubling of joists can solve a lot of problems like sagging, uneven or undersized floor joists.
Sometimes on a remodel you can’t install a full length floor joist because of plumbing, existing walls or finished floors or ceilings. In these situations it sometimes makes sense to reinforce the floor joist or even all of the floor joists.
