What is PSF live and PSF dead - Fine Homebuilding
2004年9月28日 · PSF live - # per sq ft live load - live load is movable stuff - people, furnature, etc. PSF dead load is - the weight of the material used to construct the building - lumber, flooring, shingles, etc. Normal standard for floors - depends - deck floor - attic floor, primary living area - sleeping room - lots of choices.
Deflection ratio explanation - Fine Homebuilding
2013年1月29日 · When you see span charts for a floor joist, you’ll often see something like “L/360”. What that means is that given the PSF loading specified in the chart, the live load deflection of that joist is limited to 1/360th of the span. To use an oversimplified example, a floor joist that’s 360″ (or 30′) long would be allowed to deflect a ...
How to Make Sense of Deck Loads - Fine Homebuilding
There wasn’t a clear answer in the International Residential Code until the 2015 version, where a footnote to the ledger fastener table [R507.2] reads, “Snow load shall not be assumed to act concurrently with live load,” which means you only have to design for the greater of the two loads—in your case, the 60 psf snow load.
How to Reinforce Ceiling Joists to Handle Heavy Loads
Even a stack of wood a foot deep would mean 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 still insists that doubling is OK then ask for a signed and sealed letter to this effect.”
The Story of Habitable Attics - Fine Homebuilding
2023年9月13日 · The IRC live load requirements on ceiling joists under attics can be as low as 10 lb. per sq. ft. (psf) with a maximum L/240 deflection. When those top floor ceiling joists suddenly become the habitable attic’s floor joists, they will be expected to support at least a 30-psf live load with a L/360 deflection (table R301.5).
Design Pressure - Fine Homebuilding
2007年4月17日 · The relationship between DP and windspeed is the ratios of the design pressures (in psf) are the square of the ratios of the wind-speeds in mph. <!----> <!----> A window with a DP20 is rated to a pressure level equivalent to 89mph windspeed, but it is tested (for structural) at a pressure equivalent to 134mph.
A Solid Deck Begins with Concrete Piers - Fine Homebuilding
A 12-ft. by 16-ft. deck is 192 sq. ft. Multiply by 50 psf to determine the design load, 9600 lb. Half of that weight (4800) is carried by the ledger; the other half is carried by the piers. Because the corner piers carry only half the weight that the inside piers carry, dividing 4800 lb. by three tells me the two inside piers must each bear ...
Deck Footing Sizing Table - Fine Homebuilding
A comparison of the footing sizes I calculated for the example deck resting on 1500 psf soil in the Sizing Deck Footings article and DCA 6 Table B3 shows an almost identical result. My calculations came up with 15 3/4 in. diameter center footing …
Deck Joist Span Chart - Fine Homebuilding
Deck Cantilevers. Section R507.5 notes that deck joists can cantilever up to 1/4 of the joist span. But you’ll notice when you look at the portion of the span table for joists with cantilevers that the joist span for decks with a cantilever is often less than …
Rules for Rooftop Solar - Fine Homebuilding
Subsections clarify that the roof must support the dead load of the roof including the weight of the panels plus the local snow load. Alternatively, where the snow load is less than the minimum required roof live load (12 psf to 20 psf depending on size and slope), the roof must support the dead load of the roof and the live load.