Using floor joist span tables.
Floor joist span 2x8.
The larger the deck the larger the joists.
If i sister a 2x8 to each 2x6 meaning that the bottoms of the joists line up but the top of the 2x8 is approximately 2 inches above the top of the 2x6 is there a span table for such a situation or any rule of thumb for estimating strength as per code.
Residential structural design vertical structural forces we were about to start learning about floor joist span tables.
Dead load deflection is limited to l 360 and total load deflection is limited to l 240.
1 psf lb f ft 2 47 88 n m 2.
That theory seemed safe enough for me to adopt as a.
Continuing on from part 1.
1 ft 0 3048 m.
Assume that i have an attic which currently has 2x6 joists on 16 inch centers.
2 grade of douglas fir are indicated below.
The maximum span is measured o c.
Of bearings and is based on uniformly loaded joists.
Dead load weight of structure and fixed loads 10 lbs ft 2.
A 2x8 up to 12 feet.
Maximum floor joist span for no.
The spans are based on simple span joists.
Spans in this table were derived from the irc table r502 3 1 2 design criteria.
The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel.
Live load is weight of furniture wind snow and more.
There is a commonly used old fashion method of ensuring that the proper size joists or headers are used.
2x10 to 15 feet and 2x12 to 18 feet.
However it is important to understand that all substantial spans should be properly engineered especially with the.
If the span is 6 feet or less use 2x6 s if the span is 8 feet or less use 2x8 s less than 10 feet 2x10 s etc.
In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.
A 2x8 joist was not used for floor framing during my public experience as a builder 2x10 was the minimum width for floor joist in house construction and the common length was 16ft per 24ft span.