When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started.
Floor joist braces ducts.
Whether your home is new or old it is sometimes necessary to install floor joist bracing in order to eliminate squeaking and deflection in the flooring itself.
Floor joists are 2x10s the floor appears to be fullly nailed down solid 3 4 planks.
Figure 4 2 x 4 installed below duct work table 1 provides the correct quantity of bridging relative to the span of the floor joist.
To prevent problems use saddles or straps to support at regular intervals 4c 4d follow the manufacturer s instructions but in case they get lost here is a list of best practices for.
Make sure not to install joists so they run parallel to and directly under walls where you intend to install ductwork.
Although not as good as solid or cross bridging a 2 x 4 supporting the duct work as shown in figure 4 would provide more support and load sharing than a light piece of metal.
Position bathroom vent fans so the ducts can run parallel to the joists right up to where they exit the house.
Funny i am in the middle of writing an article on this very thing.
Duct work is mostly 8 round but going to get some oval.
Don t allow your crew to walk on i joists or install subfloor sheathing until all hangers blocking panels and temporary safety bracing strapping are fully installed.
Walking on joists before all accessories and floor decking are installed i joists are unstable and can roll over if walked on leading to injuries.
Finally if all else fails drop your pipes and ducts down below the joists and box them in with wood framed.
Sometimes the best route for a flexible duct run is up and over an obstruction.
While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length.
I did an audit on a house the other day and they have several of them.
Cross bracing and solid blocking.
House is 1959 original floors.
To make matters worse the old metal ducts leak a ton or maybe two and there is a small sewage leak in the crawl located right under one of the pans.
Bracing will stiffen a floor system prevent floor joists from twisting and increase overall stability however there are actually two types of floor joist bracing commonly used.
