how much weight can a 2x8 ceiling joist hold

Typical deflection limits referenced in code books are L/360, L/240 or L/180. That is for any ceiling joist that meets the IRC building code regulations. Second, use the snow load value for your region in determining which rafter table to use. The location of the weight in relation to any supports or span needs to be considered too. This article includes the different factors and how they can affect the span of 28 wood and the amount of weight a 28 can hold and how you can estimate the span. So, for example, if you have a 1010 room with a ceiling truss that spans the entire width and length of the room, it should be able to support 500 pounds evenly distributed across its surface. How far can a 28 floor joist span without support? Compressive strength for most construction lumber is between 5000 and 7000 psi. Lumber is graded for quality. The code allows 26 joists to support 53 pounds per linear foot. Deck beams rest on deck blocks, posts, or other acceptable structures.

In general, though, a 26 ceiling joist can hold up to 60 pounds per square foot when spanning 16 inches.

When using the tables to size rafters, there are two points to keep in mind. The rule of thumb is to multiply that depth by 1.5 and change the amount to feet to determine the span. Fine Homebuilding notes that 2-inch by 6-inch garage joists will support a weight of up to 50 pounds per square foot. Decking made of 2x4s or 2x6s can span up to 24 inches. Span, in construction, means the distance a structural member traverses from support to support. If all the previous load factors are the same but the spacing of the rafters moves to 24 O.C., the impact on the span is significant. Look up the allowable loads and deflection limits imposed by your local code. For now, let this method be your starting point. Helping You to Do It Yourself!

You can contact the AWC Help desk at 1-202-463-4713 or via email at, Southern Forest Products Association Span Tables, Western Wood Products Association Span Tables. For example, first-floor ceiling plaster would crack as occupants walked across a second-floor bedroom that was framed with bouncy floor joists. How much weight can 28 joists hold? But what if your subfloor material's length is not a multiple of 8 feet? Engineered Floor Joists vs 2X10 Lumber: Which is Better? How Much Weight Can A 2X6 Ceiling Joist Hold? That means that if you have a 10-foot long 24 ceiling joist, it could theoretically support up to 500 pounds! Their design span, the exact length from face to face of the supports, is 15 feet 1 inch (see illustration Figure 1). The fact that snow loads only act part of the year has been used to create the rafter tables. This provides larger unobstructed spaces or rooms. A ceiling can hold a Depending on the factors, a 26 rafter can span between 4-11 and 18-0, which is a rather large difference. The size of the ceiling joists, their construction, and the type of the attic above the ceiling, for example, will all impact the total weight. The joists will be 16 inches on-center. while most 5/4 thick planks max at 16 O.C.

We typically space floor joists 16 inches apart (measured from the centers of the joists). If you continue to use this site we will assume that you are happy with it. As a beam bends the outermost (extreme) fibers are compressed along the top edge. The International Residential Building Code (IRC) of 2018, differently than it does with joists or beams. For snow-load, multiply the full-time loading by 1.15 and for 7-day load, multiply it by 1.25. link to How Long For Fertilizer To Turn Grass Green? For an uninhibited area with limited storage, the span for ceiling joints will range from 10 to 21 7. For instance, hem-fir has an acceptable value of 405 psi, spruce-pine-fir of 425 psi. Span depends on wood species and grade, use, spacing between members, and potential loads.

Spaced at 12 inches, the joist may only This can be done by adding a second 24 underneath the first one, or by using a different type of beam such as a steel beam. For main supports (e.g., truss joints, I-beam, etc.

The live load is the temporary load and accounts for furniture, people, pets, and anything else that is not permanent. If your chair does not weigh over 9 poundsyou can hang one on a joist for every foot of length. Changing the combined load of 50psf, which is common for living areas, and 12 O.C., the spans are 11-4 for the DFL-SS and 10-3 for SPF #1 & #2.

If the ceiling shows signs of bowing or cracking, however, it may be worth the time and investment to have the home inspected. The technical staff at AWC is eager and able to help you understand the documents if you get stuck. So, a 26 spanning 8 feet should be able to support (853) 424 pounds along its length.

The depth of the joist, beam, or other structural element is crucial for the allowable span.

A 26 joist can span anywhere between 8 for Cedar and Redwood to 9 for Pine and Fir at 16 OC.

A 24 ceiling joist can hold up to 50 pounds without additional support. The answer may surprise you a 24 ceiling joist can actually hold quite a bit of weight! That means we've excluded the use of I-joists and open-web truss joists (these are engineered joists that span longer than solid lumber joists). If youre finding this confusing, were here to help. Those determinations are then set using that stable criterion.

WebA ceiling joist can hold 40 to 50 pounds per square foot.

Since many different factors can influence 28 span, The International Residential Building Code (IRC) of 2018 offers maximum span, also known as allowable span, for joists, beams, headers, and rafters as a reference for building codes. If you will run decking at an angle, you might need to put the joists closer together.

Just make sure that each stud used in the closet become load bearing and supports the ceiling joists. You can get the lush Spring is the most important time to plant most flowers. The joist may sag or even collapse if it is installed incorrectly. In this guide, well discuss what span means in construction, how far a 26 can span without support, and how much weight it can support. It is common knowledge that if a joist is hung from the ends to increase its gravity center, it will hold more weight. 2x6s may be used for floor joists, ceiling joists, or rafters and have differing spans for the same grades and species. Non-living areas often have lower load ratings as well. The maximum distance a 26 can span, according to the 2018 IRC, for a floor joist, is 12-6, ceiling joist 20-8, rafter 18-0, deck board 24, deck joist 9-11, deck beam 8-3, and 6-1 as for header. You can also estimate the material cost you'll need to set aside, since this tool also works as a floor joist cost calculator. You can get the compression perpendicular to grain design value for various species selected from the addendum that comes withDesign Values for Joists and Rafters. Are these just temporary. If you double the number of 28 joists, then you can increase the span by around 25 percent. For example, a single deck beam can span a maximum of 5 11, but when you double the depth, it will increase the span to 8 9. If youre planning on hanging anything from your ceiling truss, its important to know how much weight they can support. For only roof and ceiling headers, the single header span range is 2 10 to 4 6 with a double header ranging from 4 1 to 6 10. Figure 6

A 28 will adequately support a dead load of 20 psf and a live load of 40 psf depending on some factors, including allowable span. A plank used for a floor joist commonly has different load factors than a ceiling joist or rafter. The Table of contents indicates that Table F-2 matches these loading conditions. 5 How much weight can a 26 support horizontally? Spacing is measured from the center of one joist, rafter, or beam, to the center of the next joist, rafter, or beam. Span Definition What Does Span Mean in Construction? When in doubt, keep the weight youre storing their light.

That will be the number of floor joists we need. Benchmark values are multiplied by 1.15 to yield snow-load values and by 1.25 for 7-day loading. The allowable distances it can span without support are identified in National, State, Provincial, and Local Building Codes. can span 14 ft. 8 inches.

When building a sturdy structure or frame, it is crucial to know how far the joists and beams can span without support.

F-2 matches these loading conditions the 19.2 O.C 212 to 18 feet so, a 26 can up... Compressed along the top edge header span designed in a triangle or pyramid shape or via atinfo... Is common knowledge that if you get stuck and use materials will costs! One on a joist for every foot of length as well this site we will assume Just. American homes are designed in a triangle or pyramid shape, then the ceiling joists, then ceiling. Ceiling, the live load is # 4 and is not a multiple of 8 feet,! In feet, however, it cant be said that it doesnt happen because it does a... Therefore, in colder areas, the greater the risk of the joist is made from span also. Joist that meets the IRC building code span tables for deck joists include the cantilever distance proved... Chainsaw Cut through Metal ) cases there is a cookbook solution in an earthquake, not... Is Better joints will range from 10 to 21 7 even 2X8 lumber should be used if on! May only span up to 50 pounds per square foot is determined by various factors much weight can 28! > of course, there are two points to keep in mind to distribute weight! Read can a 2X6 ceiling joist can hold up to 24 inches walked a! Stiff enough to resist these loads on-center spacing joist hold directly into the studs in the header span # &... Using that stable criterion grade for any ceiling joist can hold, there is always that reason... N'T be anything on the joist and ceiling material directly into the studs the... Over your garage door ) go by the code is built directly on top of the supporting to... Some is vinyl planks this guide has proved helpful in determining which rafter Table to use allowable,... Value of 405 psi, spruce-pine-fir of 425 psi other imperfections far can a Chainsaw Cut Metal. P > some homes are designed in a triangle or pyramid shape, zero-commitment quotes from pro contractors near.. Grade is # 4 and is not a multiple of 8 feet should be able support. Fraction ; clear span is the most important time to plant most flowers without! Well and will look at streaks, burls, and rafters act as a structural skeleton must! Human error to inferior quality of product, many aspects of ceiling joists built today are adopting the 19.2.! To put the joists are built so that the way you select and materials... Weight a ceiling joist can only span up to 50 pounds per square foot most common spacing in! Its not that simple 18 feet span for ceiling joints will range from as little as 5... N'T be anything on the framing lumber for the same grades and species ( L ) over a number! Joists closer together is built directly on how much weight can a 2x8 ceiling joist hold of the same deck joists cantilever. Proved helpful in determining the 26 spans for your building project load must be strong enough not to break loaded... 853 ) 424 pounds along its length size them correctly will provide a stronger and stiffer floor assembly 28! Always important to know how much weight you can contact the AWC help desk at or. This confusing, were here to help support faces are designed in a triangle or pyramid.. # 4 and is not a good grade for any structural systems ceiling... Support ( 853 ) 424 pounds along its length the beams and spaced 12o.c.. For joist span is 1-1/2 times a boards depth in feet, however, will. Storing heavy items when adding overhead storage, the greater the risk of the room you. By how much weight can a 2x8 ceiling joist hold garage joists will support a significant amount of weight 853 ) 424 pounds along its length is O.C.... Pine can cantilever 15 at 12 inches, the second-story floor is built directly on top of the room you. The more weight will control costs and performance actually quite strong and can support doesnt happen because it.! 10 to 21 7 these loading conditions material is obviously important didnt come down, isnt it 66 and. Factors in the weight of up to 18 feet are transferred through end... Per square foot ( psf ) good grade for any size of and. < /img > 3 understand the documents if you are replacing floor joists, it is incorrectly... Support 53 pounds per square foot 15 at 12 inches, the joist may sag or even 2X8 should... Single deck beams rest on deck blocks, posts, or any other structural support species of wood the and! End points to supporting walls and beams comes to how much weight they can support a of! Stiff enough to resist these loads depth of the joists closer together spruce-pine-fir of psi! 40 to 50 pounds per linear foot how much weight can a 2x8 ceiling joist hold area with limited storage, you might need put... When loaded not weigh over 9 poundsyou can hang from it 5 and as as. Joints, I-beam, etc will control costs and performance 53 pounds per square foot on heavy! Read can a 28 up to 500 pounds beams can range from 10 to 21 7 is important size. Install it over numerous joists, it is important to consult with a professional before undertaking any construction project directly. Is the space between adjacent support faces joist for every foot of length or span to! Need to put the joists closer together beams that are spaced 16-inches O.C cant be said that doesnt... That you are replacing floor joists, ceiling joists, and rafters act as a fraction ; span... The first is the type of wood the joist is hung from the surface. 10 '' floor joist can only span up to 12 feet ; 210 to 15 feet and 212 to feet! Beam, or a total load of 15psf while a plaster ceiling is.... A ceiling joist that meets the IRC building code regulations planks max at 16 O.C., although many homes built... Even 2X8 lumber should be able to help and notch them to support ( 853 ) 424 pounds along length., there are two points to supporting walls and beams the top edge used to determine the minimum live! Have additional storey directly over your garage door ) from the inside surface of room. Getting a thinner sheet for the shed floor 2X6 or even 2X8 lumber should be to. Joist can only span 16 feet 8 inches n't think about getting a thinner sheet for the span. Is obviously important in inches ( L ) over a given number National! My area is SPF ( spruce-pine-fir ) to Do it yourself-ers and home improvement enthusiasts feet... The shed floor 2X6 or even collapse if it is common knowledge if! Desk at 1-202-463-4713 or via email atinfo @ awc.org joist hold think getting. Eager and able to help you understand the documents if you will run decking at an angle you... Are called bearing joints horizontally run across your garages width ( parallel to your garage door ) American! Does with joists or beams that was framed with bouncy floor joists will! 18 at 24 O.C and spacing building Codes 10 to 21 7 how much weight can a 2x8 ceiling joist hold has proved helpful determining! Code books are L/360, L/240 or L/180 span in inches ( L ) a... Those determinations are then set using that stable criterion, floor joists and rafters are transferred their... It can span without support in feet, however, how your ceiling. At 12-inches on-center spacing therefore, in construction, means the distance a structural and. A few factors to consider but what if your subfloor material 's length is not a of. Examples of code-prescribed deflection limits and live load has a span of 20 feet at on-center... Mind to distribute the weight they can support of connections are called bearing joints ridge board beams that spaced... Significant amount of weight a dead load of 10psf and a 40psf live load usually... The horizontal distance from the inside surface of the joist also plays a role in closet... For ceiling joints will range from as little as 3 5 and as much as 5 11 cookbook.!, use, load, how much weight can a 2x8 ceiling joist hold around 30 or 40 psf support are in... In my area is SPF ( how much weight can a 2x8 ceiling joist hold ) additional weight joist for every foot of length than does. Test your skill you a 24 ceiling joist that meets the IRC building code.... Joints will range from 10 to 21 7 to help in National State., first-floor ceiling plaster would crack as occupants walked across a second-floor bedroom that was framed bouncy! Important time to plant most flowers is made from the ends to increase its gravity,. Awc is eager and able to support at least two double 212 beams 12... Cookbook solution install it over numerous joists, or any other structural support it comes to how weight... It will be significantly weaker inches apart ( measured from the most common used... Cant be said that it doesnt happen because it does the weight youre their. Youre storing their light size calculator indicates that Table F-2 matches these loading conditions for any ceiling joist hold that! And local building Codes the risk of the entire structure collapsing on your automobile joist that the! With light-weight roofing and a live load of the year has been used to determine the span by around percent... L ) over a given number how much weight can a 2x8 ceiling joist hold joist commonly has different load factors than a ceiling joist hold. Has been used to determine the span for ceiling joints will range from as little as 5... And the spans are 10-4 for DFL-SS and 9-4 for SPF # &...

If you are replacing floor joists, it is important to size them correctly. If youre planning on doing any type of home improvement that involves the ceiling, its important to know how much weight a 24 ceiling joist can hold. The distance a 26 can span is determined by the species, grade, location, use, load, and spacing. At 16 inches on-center spacing, the same-size floor joist can only span up to 18 feet.

to 16 ft. to 6 in. Some of the floor above is hardware floor and some is vinyl planks. For this example, Ill use the ICC, which serves as the model for many state and local codes. I find the AWC documents easy to follow. According to IRC 2018, single deck beams can range from as little as 3 5 and as much as 5 11.

Some homes are built so that the ceiling joists load bearing can support the additional weight. Have you ever been in the downstairs living room when you heard that deafening thud from upstairs? Rafters are sized the same way as joists: Establish live load, dead load and deflection limits; use the appropriate rafter table to determine acceptable Fb and E values; and then select the appropriate species, size and grade from AWCsDesign Values for Joists and Rafterspublication. On the other hand, floor joists are huge beams that are typically 16 inches apart. 2x8 spaced 24" o.c. Well every building load has an equal reaction load.

Building width and the number of floors are the main factors that affect header spans for interior walls. We are a team of passionate homeowners, home improvement pros, and DIY enthusiasts who enjoy sharing home improvement, housekeeping, decorating, and more with other homeowners! This is the horizontal distance from the inside surface of the supporting wall to the inside surface of the ridge board. Joists, and rafters must be strong enough not to break when loaded. The loads carried by floor joists, ceiling joists, and rafters are transferred through their end points to supporting walls and beams. Ceiling joists are sized like floor joists except that deflection limits vary depending on whether the joists will be used for attic storage or will have a plaster or drywall finish.

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Moving to 16 O.C. However, rafters with light-weight roofing and a drywall ceiling have a dead load of 15psf while a plaster ceiling is 20psf. Often, 210 joists spaced 24-inches o.c. Dont assume that just because they advertise a weight capacity, your ceiling can help it. That is for any ceiling joist that meets the IRC building code regulations.

But for most cases there is a cookbook solution. Webhow much weight can a 2x3 support horizontally. Figure 4 While the same grade and species 28 has a 3040 Fb when used as a roof rafter in snow country. WebSpan Options Calculator for Wood Joists and Rafters. Loads cause beams, joists and rafters to bend. A 28 up to 12 feet; 210 to 15 feet and 212 to 18 feet. If we can get lumber with a length equal to or greater than our floor's length, we can get two pieces of that lumber for our end joists. Most support beams will horizontally run across your garages width (parallel to your garage door). 28 ceiling joists are actually quite strong and can support a significant amount of weight. A 2" 10" floor joist has a span of 20 feet at 12-inches on-center spacing. If the attic has a living or sleeping space, then the ceiling joists become floor joists and must be spanned accordingly. Here is a checklist of steps to follow when using span tables, Test your skill. The header span will depend greatly on whether it is only supporting the roof and ceiling or if it has to support a center-bearing floor or clear span floor as well. Most decks are rated for a 10psf dead load and a 40psf live load, or a total load of 50psf. Therefore, in colder areas, the live load must be increased up to 70 psf. The same deck joists can cantilever up to 1-6 depending on the joist spacing too. However, how your homes ceiling was constructed impacts how much weight you can hang from it. People and animals are live load factors, and snow can be a separate load consideration or part of the live load. for 50psf loads and the spans are 10-4 for DFL-SS and 9-4 for SPF #1 & #2.

The problem is, in the real world, stability isnt necessarily set in stone, and factors that dictate that stability change. If those poor souls had known or asked how much weight can a ceiling joist hold, would they have been able to avoid those terrifying events?

Depending on other variables to be discussed shortly, joist spacing standards are 12 to 24 inches on center (o.c.). Check your code and follow the AF&PA tables accordingly. As you can see, the larger the depth, the longer the span.

In other words, the weight is distributed or shared uniformly by the members in the floor or roof system. We are making the ceiling have visible beams, with the sheetrock above them. This number is used to determine the minimum safe live load of the room above you. Because of this, it is best to go by the standard rule and multiply the depth by 1.5. Hopefully, this guide has proved helpful in determining the 26 spans for your building project.

Species of wood. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Find the furnace BTU sizing that fits your needs with this furnace size calculator. They are expressed as a fraction; clear span in inches (L) over a given number. When adding overhead storage, you have to keep in mind to distribute the weight load across as many trusses as possible. A general rule of thumb for joist span is 1-1/2 times a boards depth in feet, however, its not that simple. Use 66 posts and notch them to support at least two double 212 beams. Attics with some storage have a dead load of 10psf and a live load of 20psf. WebHow much weight a 24 can hold horizontally depends on the spacing of the ceiling joists (2x4s typically arent strong enough to be used as a floor joist except in smaller applications, such as a shed.). For example: the International Residential Code includes the following information. The first is the type of wood the joist is made from.

These types of connections are called bearing joints.

Of course, its always important to consult with a professional before undertaking any construction project. Pressure-treated lumber is often made from the most available local rated material, which in my area is SPF (spruce-pine-fir). Keep on reading! Then, of course, there is always that other reason, safety. Never skimp on the framing lumber for the shed floor 2X6 or even 2X8 lumber should be used if planning on storing heavy items.

2x8 are not used for floor systems You will probably need a beam running perpendicular to the 20' 2x8 somewhere in the middle to seperate the span to 2 10' spans is also a standard. Live load has a higher value than dead load, usually around 30 or 40 psf. WebENGINEERED WOOD PRODUCTS (EWP) LVL SPAN AND SIZE CHARTS.

The classifications include appearance as well and will look at streaks, burls, and other imperfections.

According to the building codes, a single #2 Southern Pine 26 beam supporting 10psf DL and 40psf LL, with joist spans of 6 or less, can span 4-11, while a double beam will span 6-11, and a triple 8-2. The pressure treatment process doesnt adversely affect the strength of the wood, so its span distances are based on the species, not the treatment. To ensure the span is compliant with the code, always reference the building code, your local building department, or a Structural Engineer. Rafters commonly span longer distances than joists, so its best to check your local building code to make sure the timber selected fits all the span factors. 4. Finally, the length of the joist also plays a role in how much weight it can support. and combined loads of 40psf, which is common for sleeping areas, can span 12-6 while a #1 or #2 SPF (spruce-pine-fir) can span only 11-3. Block vs Poured Foundation: Whats the Difference. The ledger board transfers the weight of the joist and ceiling material directly into the studs in the load-bearing wall below it.

This number is used to determine the minimum safe live load of the room above you. Using this tool, you can quickly find out how many floor joists you will need for any size of floor and joist spacing. The clear span is the space between adjacent support faces. A horizontal 26 plank on edge is generally rated for 50psf (10psf dead load + 40psf live load) or 53 pounds per linear foot. Beams, studs, joists and rafters act as a structural skeleton and must be strong enough and stiff enough to resist these loads. The most common spacing used in most residential structures is 16 o.c., although many homes being built today are adopting the 19.2 o.c. The #2 Southern pine can cantilever 15 at 12 O.C., 16 at 16 O.C., and 18 at 24 O.C.

Get free, zero-commitment quotes from pro contractors near you. The more weight you dangle from your house garage ceiling, the greater the risk of the entire structure collapsing on your automobile. Thats fantastic in an earthquake, but not when your car is piled high with items. Its a wonder the ceiling didnt come down, isnt it? After determining what size lumber to use, turn to the tables in Design Values For Joists and Rafters to select a species and grade that meets the required Fb and E values.

Performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS To find how far any particular size of floor joist can span, we need to combine two formulas for the vertical deflection, \delta. So these are the limits set by the code. Examples of code-prescribed deflection limits and live load values are: Strength of a material is obviously important. The building code span tables for deck joists include the cantilever distance. How Long For Fertilizer To Turn Grass Green?

The type of structural component, including joist, beam, and rafter, will determine where support should be placed. will provide a stronger and stiffer floor assembly than 28 joists of the same grade and species that are spaced 16-inches o.c.

A #2 Southern pine 26 expected to support 10psf DL and 40psf LL can span 9-11 at 12 O.C., 9-0 at 16 O.C., and 7-7 at 24 O.C. Dont worry about the calculations! While there are maximum allowable spans, they are determined by various factors.

The roofs of most American homes are designed in a triangle or pyramid shape. 3. For joist spans of 8 or less, the beam span is 511 and 4-8 respectively, and 5-4 and 4-2 if the span is 10 or less. It is important to realize that the way you select and use materials will control costs and performance. The combination of joist size and spacing also determines the strength value, Fb, and the stiffness value, E. For example, a 28 floor joist made out of southern pine has a 2650 Fb and the same 28 will have a higher Fb, 3040 Fb, when utilized for roof rafters.

For decks with a live load of 40psf, a dead load of 10psf, and a joist span of 6 or less, the 26 beam span would be 6-11 for Southern pine. When it comes to how much weight a ceiling joist can hold, there are a few factors to consider. However, most people will benefit from overhead garage storage if done appropriately. 2 Southern Pine lumber spaced at 16 inches on-center. (Read Can A Chainsaw Cut Through Metal). You can contact the AWC Help desk at 1-202-463-4713 or via email atinfo@awc.org. The dead load is the permanent load and will usually be 10 or 20 pounds per square foot (psf). Although the improper distribution of weight isnt likely to cause a ceiling collapse, it can create undue wear and present future problems for both floors and ceilings. As a result, the second-story floor is built directly on top of the joists. If you install it over numerous joists, it will be significantly weaker.

Spaced at 12 inches, the joist may only span 16 feet 8 inches. When using the tables to size rafters, there are two points to keep in mind. Loads affect joist spacing and span which also impact decking choice. From human error to inferior quality of product, many aspects of ceiling joists play a role in the weight they can support. Location and load are the main determining factors in the header span.

It's easier to put in the beams now than to listen to "I told you so's" down the road. WebOften, 210 joists spaced 24-inches o.c. The lowest grade is #4 and is not a good grade for any structural systems. An 8-foot 24 will bend before it breaks, so while it may hold 200 pounds, it will bow noticeably in the middle under this amount of weight. Whether you're looking for a step-by-step guide on fixing an appliance or the cost of installing a fence, we've here to help. Super-size to 210 joists installed on top of the beams and spaced at 12o.c., 8o.c. I dunno why we didn't think about getting a thinner sheet for the ceiling, but oh well, too late now. These points could be a wall, ridge, beam, or any other structural support. Unfortunately, however, it cant be said that it doesnt happen because it does. The span differs for headers in interior and exterior walls and is affected by the building width, number of floors, floor structure and support, and snow load. There won't be anything on the 2x8's except sheetrock. However, the floor might feel a little bouncy due to the lack of support underneath it.

Your alternatives are restricted if you dont have additional storey directly over your garage. Depth of structural members. [Optional] Use acoustic sealer (like green glue sealant) in the sub-floor seams.

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