How to span 30 feet with wood

The other option is to have a stile in the middle of the span and put shelf supports on the stile and the backs of the cabinet, effectively cutting the shelf in two. With the center support, it will be like having shorter shelves without the center plywood divider. Any shelf over 34", we laminate 2 layers of 3/4 ply and use 1 1/2" shelf nosing.

Dimensional lumber is used for floor joists, for example, 2x6s, 2x8s, or 2x10s. Engineered wood beams and floor trusses are specialty products built to be straight and strong and span 30 feet. Most contractors use engineered wood beams and floor trusses in new construction homes to save on construction material costs.Build 20x20 Deck • What size lumber can span 20 feet?-----Our main goal is creating educational content. The topic of this video has been processed in t...Step 1: Determine Load Factors. Step 2: Calculate Total Load. Step 3: Determine Beam Spacing and Overhang. Step 4: Consult Load Tables or Structural Design Software. Step 5: Select Beam Size. Step 6: Verify with a Structural Engineer. In Conclusion: Understanding Laminated Veneer Lumber (LVL):The size of the LVL (Laminated Veneer Lumber) needed to span 30 feet depends on several factors, including the load it needs to support and local building codes. Typically, for a span of 30 feet, you would need 5-1/4″ × 16″ or 5-1/4″ × 18″ size of engineered LVL beams, often custom-made to meet the specific requirements of your project.35' is a heck of a span to begin with. Not many LVL manufacturers have spans listed that high in their literature. ... FWIW, span-to-depth ratios are a great first check for any beam, wood, steel or concrete... because, for deflection, moment of inertia is more important than material properties. ... A W14 has a span-to-depth ratio of 30 (420 ...From there, multiply the length and width together to arrive at the total square footage of your deck. For instance, if the longest point of your deck is 20 ft and the widest point of your deck is 16 feet, your deck's total square footage would be 320 square feet. 20 ft (length) x 16 ft (width) = 320 sq. ft. When building a deck from the ...You can cover the center butt joint with a post to beam connector. Back to that patio layout, a center post would be directly in line with the back door when you walk outside. The door swings in, but if it swung out, it would hit that center post. No center post. 24 foot span.The span of a mono truss depends on the type of truss and the materials used to construct it. Generally speaking, a mono truss made of wood is limited to spans of around 25-50 feet, while steel mono trusses can span up to 300 feet. However, steel trusses can be extended beyond 300 feet by using additional supports.

1) Construction cost of 1000 square feet House 2019? Cost of House Construction per square foot 2019https://www.youtube.com/watch?v=dsLFJMDZcLs2) Grade Of Co...A beam overhang can be maximum of 3/8 of the supported span. Steel beam or rsj size for 30 feet span :- as per general thumb rule, for 30 feet span size of steel beam or universal beam or w beam or I beam or UB’s or hot rolled section or Rolled steel joist (RSJ) should be ISMB 450 or UB 450×180 or W18 used for residential building or ...How far can a 2×12 rafter span: A 2×12 rafter can span 30 feet 2 inches when spaced 12 inches apart on centre, 23 feet 10 inches at 16″ OC & 19 feet 6 inches at 24″ OC without support with best quality No. 2-grade southern pine lumber with a maximum live load of 20 pounds per square foot (lbs/ft2) and a dead load of 10 psf.The sum will be the height of your double header in inches. For example, if the span is 4 feet, add 2 to 4 for a sum of 6. Therefore, the header would need to be made from doubled 2x6s. For odd numbers, round up. This rule of thumb seemed to be consistent with what I had observed as a contractor as being typical of header details in the ...This is a great thing, especially seeing as it saves time and money of the extra wood needed to span greater than 4′ gaps. When we are planning a pole barn home, often we will suggest 2′ on center trusses for the home portion where drywall ceiling will be installed and 4′ to 8′ on center in the shop where metal will be installed.

Find out the minimum size floor joists you need for building decks, sheds, or room additions for different types of wood on both 16” and 24” spacing. Expert Advice On Improving You...The size of the LVL (Laminated Veneer Lumber) needed to span 30 feet depends on several factors, including the load it needs to support and local building codes. Typically, for a span of 30 feet, you would need 5-1/4″ × 16″ or 5-1/4″ × 18″ size of engineered LVL beams, often custom-made to meet the specific requirements of your project.A floor truss can be designed to span 30 or more feet with ease. The truss manufacturer can build them so strong that there's no bounce to the floor at all. This …What size floor joist to span 10 feet. A 2×6 (2-by-6) size of floor joists, made of southern yellow pine, graded as #1, can be used to span 10 feet long when spaced 16 inches apart on O.C and live load of 30 Psf and dead load of 10 Psf.35' is a heck of a span to begin with. Not many LVL manufacturers have spans listed that high in their literature. ... FWIW, span-to-depth ratios are a great first check for any beam, wood, steel or concrete... because, for deflection, moment of inertia is more important than material properties. ... A W14 has a span-to-depth ratio of 30 (420 ...Discover palliative care options for children with heart disease across the lifespan. Learn from the AHA's science news about comprehensive care approaches. National Center 7272 Gr...

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The span of a mono truss depends on the type of truss and the materials used to construct it. Generally speaking, a mono truss made of wood is limited to spans of around 25-50 feet, while steel mono trusses can span up to 300 feet. However, steel trusses can be extended beyond 300 feet by using additional supports.Every two to three years, make sure to clean your wood fence to avoid dirt, moss, mildew, and graying. Then, use a UV inhibiting, water-repellant coating. After you make the proper repairs, scrape off any moss or peeling paint until you're able to see your wood again. If you see any mold on your fence, you can mix 20% bleach with 80% mild ...What size floor joist to span 10 feet. A 2×6 (2-by-6) size of floor joists, made of southern yellow pine, graded as #1, can be used to span 10 feet long when spaced 16 inches apart on O.C and live load of 30 Psf and dead load of 10 Psf.To span 10 feet, you might consider using an LVL beam of approximately 3.5 inches in width and varying depths depending on the load requirements. A 3.5 x 9.25 inches LVL beam, for instance, could potentially span 10 feet under specific load conditions, but it's crucial to confirm this with load tables or a structural engineer.The most frequently used quality materials for custom-built wood shelves are 3/4” thick plywood, poplar, or pine; definitely avoid the melamine-laminated composite shelving and MDF. And a typical shelf …The cheapest safe way for you to accomplish this is to go to a truss manufacturer. Have them engineer and design four (4) 30 foot, flat top trusses - two, doubled, for each side of the bridge - about four feet apart. Tell them you are thinking of "Pratt" trusses... or possibly "Lattice" trusses. There's a possibility they will tell you that you ...

For example, your house is 40 feet long with a 24″ rafter spacing. So the first thing you need to do is convert 30 ft to inches. 40ft x 12″ = 480″ (length in inches) ÷ 24″ on-center = 20 rafters. After getting the answer, add 1 for the '0' rafter and multiply it by 2. You'll get the number of rafters needed for your roof.From contributor A: A 6 x 8 will span 12' for flooring. Even with your light load, you are pushing at 20' plus the uplift and side shear for the wind. Maybe if you integrated some arched gussets. From contributor M: You can pick up Ted Benson's book "Building the Timber Frame House."Luckily, there are tons of handy charts to help get you started. Ideal deck post spacing is 8 feet or less. The distance between deck support posts depends on the type of wood species used and the size of the joist and beam. There is no minimum span, and maximum spans can reach up to 15'.Oct 10, 2023 · The size of the header needed for a 10-foot span will depend on factors like the load it needs to support and local building codes. Common choices might include a 4×6 or 4×8 header. How do you span 30 feet with wood? Spanning 30 feet with wood typically requires larger structural members like engineered beams or multiple support columns and ... What size lumber for a 15 foot span. For a 15 foot span, you will need atleast 2×8 size of lumber/ floor joist when spaced at 12″ apart. Thus, a 2×8 size of lumber can allow to span 14 feet. For a 14-foot spans, the lumber has to be at least 8 inches in depth used as floor joist. What size lumber for a 16 foot span What size beam for a 12 ft span? For a 12-foot span, a wooden beam might typically be a 4x12 or larger, depending on load requirements and other factors. The actual size should be determined by an engineer. How far can you span with a 2x12? The maximum span for a 2x12 wooden beam can vary based on factors like wood species, load, and local codes.24 ft span floor joist. I am building a loft in my barn, it will be 24 foot wide by 60 foot long and 7 feet tall. I was trying to keep the middle span open underneath the loft. I was planning on using 2″x12″x16′ joists, they would overlap by 8 ft in the middle. I was going to use 4 bolts, nails and heavy duty adhesive.Conclusions :-. As per thumb rule & general guideline, for a 20 foot span, size of GLULAM beam should be 12 inches deep and 5 1/4 inches wide, thus you would need something like a 5 1/4″× 12 GLULAM to span upto 20 feet length. RSJ beam size for 3m, 4m, 5m, 6m, 7m, 8m, 9m and 10m span. What size Glulam for 22 foot span.If you mean to span the total distance between the posts and go for 24 feet, you better get an engineer for that one. 16 feet isn't that big a deal for some 2x12 with plywood. Garage doors do it all the time. If you really want to increas your 12 ft span to 16 foot, then your talking about relocating one or both posts.The maximum span for a 2×10 beam without support depends on factors like the wood species, grade, and load. Consult span tables or an engineer for precise calculations. What size I beam for a 30-foot span? ... Consult with a structural engineer for an appropriate beam size. How big of a beam do I need to span 22 feet? The size of the … 3. Spans shown are in feet 4. Deflection Limits: Live Load – L/480, Total Load – L/360 5. Top and Bottom Chords braced by structural sheathing 6. Openings are to be located in the center of the span, max opening width is 24 inches 7. Single spans only The price of wood multiplies exponentially depending on its length - not to mention its weight does, too. A 30' beam easily weighs upwards of 500 lbs and would take a professional crew and some …

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Use 1 1/2" square tube steel with a .083 wall and weld it together. Then weld a diagonal brace from the bottom of hinge side to top of latch side. Attach 2x4 with carriage bolts and pickets as usual. This keeps the gate frame from racking out of square after the gate is hung. If possible use steel posts also.Aug 15, 2023 · The span of roof trusses depends on design factors and load requirements, but common spans are 20 to 30 feet or more. How much does a 30 ft truss cost? Truss costs vary widely based on design, location, and materials, but a 30-foot truss can cost hundreds to thousands of dollars. By the way the polycarbonate panels are available 24", 36", 48", 72" and 83" wide. 25mm thick and up to 24' long. At additional transportation charges. Thank you in advance. You'll need trusses or TJIs for that span, and talk to an engineer (or the "truss guy" at the lumberyard, who will have a program that will spit out results ...I have attached two pictures of the finished bridge. The footings are 2’x6’ (step type) and 3 ½ feet deep, there are four 2x6 arches 30’ long a nd the decking is recycled TREX decking from a co-worker replacing his deck. In all this cost me $1500 and my time.Mar 3, 2024 · There are online calculators available to help you determine the required beam size for specific spans. As a general guideline, for a 20-foot span, you should opt for a 4-2×16 or an 8×16 wood beam. In other words, a 2×16 wooden beam with four nails or a 4×16 wooden beam with eight nails can effectively span 20 feet. Floor Truss Span Tables Alpine Engineered Products 17 These allowable spans are based on NDS 91. Maximum deflection is limited by L/360 or L/480 under live load. Basic Lumber Design Values are F =2000 psi F =1100 psi F =2000 psi E=1,800,000 psi Duration Of Load = 1.00. Spacing of trusses are center to center (in inches). Top ChordWatch on. The maximum span of a 2×6 board for a lean to structure depends on the load the structure needs to support and the species of the lumber. Generally, a 2×6 of #2 Grade southern yellow pine can span up to 6' - 0" if it is used as a joist and the total load on it is less than 25 lbs/sqft. If the lumber used is of a lesser grade ...

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The IRC's span tables make it easy to pick a joist to bridge a simple span—one without intermediate supports or cantilevers— or to work the other way around to get the biggest simple span out of the wood available. But span is just one of many rules relating to joists; there are others for blocking, notching, and bearing lengths.Determine the Rafter Length: Measure the length of the rafter needed for your roof design, accounting for any overhangs or additional features. Mark the Rafter: Using a framing square or a speed square, mark the plumb cut and the birdsmouth notch on the rafter. The plumb cut determines the angle of the roof slope, while the birdsmouth notch ...Oct 31, 2022 · Step 1 – Determine the design of your bridge. Step 2 – Dig out the area for the footings. Step 3 – Create the footings for your bridge. Step 4 – Create the abutments for your bridge. Step 5 – Lay down boards on top of them and screw them down with deck screws. A bridge is a structure built to span physical obstacles such as a body of ... How to span a 28' gap, preferably with wood. Ask Question Asked 5 years, 9 months ago. Modified 5 years, 9 months ago. Viewed 218 times ... By "sistering" I mean to sandwich two 2x6s or 2x8s together (in offset lengths) to reach the full 27' using wood glue and then heavy duty screws on both sides (or perhaps bolting them together in a number ...The size of the header needed for a 10-foot span will depend on factors like the load it needs to support and local building codes. Common choices might include a 4×6 or 4×8 header. How do you span 30 feet with wood? Spanning 30 feet with wood typically requires larger structural members like engineered beams or multiple support columns and ...Sleeping Room: Use Table R502.3.1 (1) Floor Joist Spacing: 12 inches. Species and Grade: Hem-fir #2. Lumber Size used: 2×10. Now lets find the maximum allowable span for a 2×10 member given the above scenario: Therefore given the above example, the maximum allowable span for a 2×10 member is 18′-6″.Allowable uniform load based on deflection of 1 / 360 of span is 100 pounds per square foot except the span rating of 48 inches on center is based on a total load of 65 pounds per square foot. Allowable load at maximum span. Tongue-and-groove edges, panel edge clips (one midway between each support, except two equally spaced between supports 48 ...The length, or span, of a 2×6 framing stud ranges from 84 inches to 120 inches. The typical length found in U.S. hardware stores is 96 inches, or 8 feet. The type of wood that is b...Span entries are listed for 2×6 through 2×12 joists and 12 in., 16 in., and 24 in. on-center spacing. The illustrations (one for cantilever joists and one for flush rim-beam hung joists) point out where joist span measurements are taken from — the saddle of the ledger mounted joist hanger to the center of a dropped beam or saddle of the ... ….

The size of the LVL (Laminated Veneer Lumber) needed to span 30 feet depends on several factors, including the load it needs to support and local building codes. Typically, for a span of 30 feet, you would need 5-1/4″ × 16″ or 5-1/4″ × 18″ size of engineered LVL beams, often custom-made to meet the specific requirements of your project.The strength, or load-bearing capacity will vary with wood species, and the length of span. A stick of white pine is lighter, but not as strong as yellow pine, plus, you also have to look at the number of knots, and the relative size of the knots because the knots do not add strength, they tend to make break points especially if the knot ...The American wood Council National design specification for wood, lvl is type of structural composite lumber comparable to glued laminated timber (glulam). ... In addition, a double ply 18″ LVL beam can allow to span maximum distance of 30 feet. In general, the maximum span for a double 5 1/2″ LVL need to be 10 feet, while the the maximum ...Switching to a 3-1/2-inch wide 2.1E 3100 LVL beam, a 7-1/4-inch deep beam can span up to 20 feet, a 9-1/2-inch deep beam up to 26 feet, and wider or thicker beams can span more than 30 feet. For instance, a 30-foot 7-inch wide by 24-inch deep 2.1E 3100 LVL wood beam has a total allowable load of 1241 pounds per linear foot for supporting a ...Glulam beam weight per foot:- a 3- 1/2″ × 10″ size of Glued Laminated timber or Glulam beam can weight around 8.75 pounds per linear foot and a 3- 1/2″ × 12″ size can 10.5 lbs. One linear foot is the equal of a one-foot length of a wood. High strength structural engineered wood or Glued Laminated timber or lumber or Glulam beam can ...LVL beams can span up to 60 feet, with costs ranging from $3 to $11 per linear foot, depending on the span length. ... What size LVL to span 30 feet (with Calculator) Load Bearing Wood Beam Calculator. Leave a Comment Cancel reply. ... Wood Beam Span Table Ontario; Doyle Log Rule Calculator - Log Board Foot Calculator (Online) ...Teri asks, “I've had problems with the polyurethane finish peeling on my heart pine floors. If I sand them down, will stain alone be enough to protect them?”Stain alone is not a su...I have a covered terrace that extends 10' out (West) from the house towards the yard/pool and has a width/span of 32'. The current beam is made up of (2) 2x6 in wood placed side-by-side functioning as the beam. It is currently supported by (4) 4x4 wood posts which are rotting away. The beam supports (17) 2x6 joists.For example, let's say you are using a beam to support a roof on a 30-foot span and you're allowed 1/360th of an inch of deflection. To calculate how big your beam should be, divide 30 by 360 to get .0833 feet. This is less than an inch, so you'll need a 1-inch beam. How to span 30 feet with wood, For sake of discussion we will assume a minimal roof snow load of 20 psf (pounds per square foot) and a 4/12 roof slope. Dead load will be the actual weight of the roof steel and the roof purlins. HemFir has a base Fb of 850 psi multiplied by the size factor of 1.5 = 1275 psi. In bending, 2×4 #2 purlins would work at 12″ on center, however I ..., Conclusion. If you are planning to span 16 feet with a beam, you will need to use a beam that is at least 6 inches wide and 18 feet long. The size of the beam will also be determined by the type of wood you select. For example, if you use an engineered wood beam, you will be able to span a longer distance than if you use a solid wood beam., Use design loads of 20 LL and 10 DL for an unfinished attic area with limited access. Specify 16" on-center joist spacing to match the roof rafter spacing, and refer to the Ceiling Joists table on page 3. A 1⁄2" x 71⁄4" 1.5E TimberStrand® LSL ceiling joist can span 15'-7", which is adequate for areas C and E ., RCC beam size for 12 feet span, what will be beam size when distance between two column is 12 feet, what size beam do I need for a 12 foot span, how do you c..., 50 inches / 12 = 4.1667 inches. Round up to the nearest even whole value to find the door header height. 4.1667 inches → 6 inches. Combine this value with the wall frame material thickness, typically 4 inches, to get a lumber size of 4" × 6"., When building a roof, how do you calculate the length of the rafters? All you need to know are the span of the building and the slope of the roof., So, a 12-foot span would require 2x8 joists: (12 ÷ 2) + 2 = 8. ... Each 2x6 steel joist provides roughly the same strength as a 2x10 wood joist, allowing the material to span a greater distance without increasing the size. Steel joists can be spaced 12, 16, 20, or even 24 inches apart, depending on the load restrictions for the deck. ..., Second, all banding should be inspected prior to hoisting to make sure it is intact and secure. Again, never use the banding to lift the bundles. For trusses between 45-60 feet in length, at least two pick points should be used to lift a bundle (see Photo B1-12). For trusses over 60 feet in length, a minimum of three pick points should be used., A 14", 16", and 18" deep will all span 30', but 16" and 18" are typically doubled or tripled for greater loads. 3-1/2" 2.1E 3100 at 7-1/4" deep will span 20', a 9-1/2" up to 26', and other depths 30'. A 7" 2.1E 3100 at 24" deep can potentially span up to 60' depending on load and construction variables, and ..., Use this wood beam span calculator to check a wood beam of a particular size and length to see if it can support a given uniform linear load by comparing its allowable and required bending and shear stress. ... we want to find the deflection of a 2" × 10" select structural Douglas Fir Larch beam that spans 8 feet (or 96 inches) in length, and ..., A single sheet is typically 48 inches wide (size 4' × 8'). Framing a stud wall at 16 or 24 inches OC will result in the edge of a vertical sheet falling over the center of a stud, as 48 is divisible by both 16 and 24. Thanks to this, the edge of the sheet is securely supported and backed by about ¾ inch of wood, which we can use for nailing., Examples are flat roof commercial buildings. The dimensions I noted are found in many places. But the best location is the International Residential Code for rafter size R802.4.1 R802.4.1(1) through R802.4.1(8). This goes through types of wood and a few other variants. Snow loads in northern areas are in the local codes. Usually decreased spacing., Beam Span Chart Table. The span of a beam is dependent on a few variables: The grade and species of lumber, size of lumber and the load it carries. Fewer posts on upper-level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans. Beam span maximums are based on a maximum ..., My rule of thumb for floor design is a minimum of one inch of depth for every foot of span. i.e. an 11 7/8" I-joist shouldn't span over about 18'. If you're spanning 26' 6" and want a stiff floor, your floor members need to be 18" deep. Using 11 7/8" I-joists at that span is ludicrous., For each 4x4 removed add a 2x? The entire span. Support the end of the span with the entire width. Use 8 ' 2x and cut the first on in half (4') so the joints stagger. Use 3/8 lag bolts every two feet starting 4" from each end. Three bolts every two feet., This online rafter calculator helps you calculate rafter length based on the roof slope ratio in inches per foot and the width of the building. The computation includes results for the hip/valley factor, slope factor, and the roof slope in degrees. If you include an eaves overhang dimension, the calculator will incorporate the extension of., 1) Construction cost of 1000 square feet House 2019? Cost of House Construction per square foot 2019https://www.youtube.com/watch?v=dsLFJMDZcLs2) Grade Of Co..., A floor truss can be designed to span 30 or more feet with ease. The truss manufacturer can build them so strong that there's no bounce to the floor at all. This comes in handy if you desire a ..., For example, a 30×20 would refer to a 20′ wide by 30′ tall truss. Truss spacing depends on the building’s span length. For example, if you have an 18′ wide span then each set of trusses should be spaced 18″ apart from one another (measured from centerlines). 30 foot 4/12 truss dimensions. 30 Foot 4/12 Truss Plan. Truss Sizes:, Example: The highlighted cell (below) shows that a 2" x 6" Douglas Fir joist, with a grade of #2, spaced 24" apart, can have a maximum span of 10 feet - 8 inches (10-8). ). Based on the following design requirements: an uninhabitable attic with limited storage has a live load of 20 Psf, a dead load of 10 Psf, and a deflection limit of L/240 (span in inches divided by, Span Tables for Purlin Supporting Rafters (to BS 5268-7.6) Imposed loads of 0.75 kN/m² snow load are applicable to most areas where the altitude does not exceed 100 metres (refer to BS 6399-3) Imposed loads of 1 kN/m² snow load are applicable to most areas where the altitude exceeds 100 metres but does not exceed 200 metres, but excluding ..., American Wood Council, The size of a header is determined by the span (the distance between two supports), the weight of the house and the loads imposed by wind and seismic activity. For a 12-foot span, you will need a header that is at least 24 inches deep and 6 inches wide. If you are using an engineered header, you will need to follow the manufacturer's ..., Woah thats way to far of distancing between trusses u can have posts that span 8ft oc. In doing that you’d have to use box beams or use LBL beams and and do a layout of 4′ oc. For your rafters and then id use 16 foot lumber and stagger your roof perlings., For example, let's say you are using a beam to support a roof on a 30-foot span and you're allowed 1/360th of an inch of deflection. To calculate how big your beam should be, divide 30 by 360 to get .0833 feet. This is less than an inch, so you'll need a 1-inch beam., Can I build a 3 ply dimensional lumber beam to span 24 feet? If not, what should be used for the application. It is for a 20 foot, by 24 foot pergola. The potential plan would call for two 20 foot outside beams. Supported by 3 (6x6) posts each. To span the gap, would be 3 parallel beams 10 foot on center, at 24 feet in length., The first span table is for roofs where the ceiling is not attached to the rafters (with no snow load), a live load of 20 Psf, a dead load of 20 Psf, and a deflection limit of L/180. The second span table is the same as the first, except it assumes a ground snow load of 50 Psf. When calculating the maximum span of a rafter, use the horizontal ..., Floor joist: Horizontal pieces or slats that hold up flooring materials. Header joist: Frames the opening of the floor. Blocking: Small blocks of lumber between joists that stabilize and brace the slats. Beam: Provides structure and supports the weight of a floor; made of lumber or steel. Sill plate: Treated wood attached to the top of a home's ..., Span entries are listed for 2×6 through 2×12 joists and 12 in., 16 in., and 24 in. on-center spacing. The illustrations (one for cantilever joists and one for flush rim-beam hung joists) point out where joist span measurements are taken from — the saddle of the ledger mounted joist hanger to the center of a dropped beam or saddle of the ..., In general, though, most wood beams can span somewhere between 20-40 feet depending on the factors mentioned above. So if you’re planning on using a wood …, Free Lean-to Roof PDF Plans. Please follow links provided below to open free detailed PDF plans for 8' wide, 10' wide, 12' wide and 16' wide lean-to overhangs. Most plans include list of materials needed to build a lean-to addition. Please use your judgment and common sense and go over the list to make sure everything looks good. We did our best., I spend some time playing in webstructural.com when I approach these projects. They have metal and wood in there and it does all of the structural calculations that your structural engineer does. But you have to know what it wants for input and what it saying in the output. Your span isn't crazy and having 2' of floor thickness to use is nice., Some decking materials installed at a 45-degree angle to the run of the joists require the joist spacing to be 12 inches on center. Your joist span will depend on the size of the joists (i.e. 2X8 vs 2x10 vs 2X12). See the below span chart as well as the local codes and guidelines for your jurisdiction. The larger the span, the larger the joists.