what is an inexpensive material to use to support sagging ceiling joists
That's Leo's delimma, as he explains in this Fine Homebuilding forum mail service. The recently completed sixteen- by 24-foot building has ii×4 walls and a roof with a 2×10 ridge and 2×6 rafters.
It was only afterwards the building was upward did Leo realize he hadn't figured in the added weight of the lumber on the ceiling joists.
"The xvi-ft. 2x6s are there to keep the ii×6 rafters from spreading," he writes. "This is a pretty basic design, designed by an engineer and canonical by the town. I only wish I mentioned it before that the cranium might exist used for storage. If I had mentioned information technology earlier what would I have done differently? I don't want a axle or posts running downwards the middle for obvious reasons."
If he doubled up every other joist, would it be enough to handle the weight of "a lot of hardwood." His engineer is comfortable with this, but what does everyone else think?
A little sag, but it won't collapse
The 2×six joists will sag, no doubt, says DanH. "They volition probably non plummet, and the load will probably not compromise the construction. Many a garage has been loaded down for decades the way you propose, and out-and-out failures are rare, in spite of the rather inferior garage construction techniques used 60-lxxx years agone."
Just, DanH adds, that assumes Leom uses common sense and doesn't overload the overhead storage area with wood.
The sag could be reduced or eliminated past installing king posts, or Leom could sister 2x8s to the two×6 joists to "roughly triple" the load-bearing chapters of the ceiling.
"Since this isn't a floor, and so the allowable deflection tables don't actually apply," adds Jigs-northward-fixtures. "They are mostly there to keep people walking on the flooring comfortable, or preclude inflexible floor like ceramic tile, from being damaged. The structure would be audio with considerably more deflection."
Even a stack of wood a human foot deep would hateful a load of 50 lb. per sq. ft. (psf).
Engineer 10 is skeptical.
"Tell your engineer that another engineer says that doubling 2x6s doesn't work for heavy loads," he writes. "If he/she nevertheless insists that doubling is OK and so ask for a signed and sealed letter to this effect."
Engineer x adds that a No. 2 two×half dozen over a sixteen-ft. bridge can deport ten psf while a 2×8 will conduct 20 psf. Sistering the two together means a load-carrying capacity of 30 psf.
"This is based on angle force only not deflection, therefore a load larger than that will cause collapse," he writes. "The load can exist considered permanent dead load since it will exist at that place for months at a time which makes everything worse because of material fatigue.
"In addition to that the deflection will exist and then noticeable from beneath that it will look frightening to a casual observer."
I-joists would have been a skillful bet
Calvin suggests that I-joists would accept been an alternative to consider at the start of the project. In his ain garage, he used I-joists with ii×four flanges for a 30-ft. clear span.
"No sistering or modification of I-joists to the existing state of affairs," he says.
There'due south a problem with I-joists, Sandcastles points out. Leom is already concerned at that place isn't enough room between his double top plate and the roof to wedge in the boosted 2x8s, and the minimum I-joist Sandcastles knows of is nine i/iv in.
"You probably have to fifty-fifty more significantly trim the 9 1/iv I joist, cutting it more manufacturers will let," Sandcastles says.
Likewise, says Leom, the load rating for an I-joist is 100 psf live load, twenty psf for a expressionless load, and that doesn't help his state of affairs much because lumber stored overhead for long periods of fourth dimension is dead load.
Piffin had this variation on the I-joist option:
"What I would do is to add a 2×4 to the top and bottom of each joist, using gum and structural screws to catechumen each joist into an I-joist in identify," Piffin writes.
"You could fifty-fifty perhaps introduce a proficient crown to each by property the bottom chord in place with a slightly long 2×4 post under the middle equally you install it. Practice bottom chords get-go, then the tops. Leave posts in identify until all fasters are in and the glue kicks well."
Or, utilize LVLs in a limited area
JAlden wonders whether Leom actually needs storage over the full 24-ft. length of the store. Would, say, viii ft of storage exist enough for the corporeality of wood he has?
"If so, go buy 4 pieces of 9 1/4 inch [laminated venner lumber]," JAlden writes. "Last time I bought them they were about 3 bucks a foot and then we are talking 200 dollars here.
"Cut the ends at the bending of your roof and see how long you tin can make them and nonetheless get some bearing on your superlative plates. You may go full begetting if y'all accept some roof overhang to slide one side into. Get as much bearing as you can. Even half of the plate is sufficient.
"Sis these to every other two×half dozen and you lot'll have viii anxiety of beefed upwardly expanse."
RELATED LINKS
6 Ways to Stiffen a Bouncy Floor – Bouncy floors are one of the virtually vexing issues faced in houses, both new and old. Contributing editor Mike Guertin teams up with structural engineer David Grandpré to detail 6 mutual, and not-so-common, means to stiffen up the joists and go along the china cabinet from wobbling.
How to Repair a Butchered Floor Joist – The criticism is often undeserved, but plumbers nonetheless have a reputation for taking a recip saw to studs, joists and rafters when they get in the way of supply and drain lines. Learn how torepair a floor joist, if you lot ever do run into this trouble.
Supervene upon a Rotten Lally – A proper footing and post add floor support that volition never fail again.
Stiffening a floor – In this Q. & A., Former associate editor Roe A. Osborn gives advice on hardwood floors and tips on how to stiffen hard wood floors.
Source: https://www.finehomebuilding.com/project-guides/framing/how-to-reinforce-2x6-ceiling-joists-to-handle-heavy-loads
0 Response to "what is an inexpensive material to use to support sagging ceiling joists"
Post a Comment