how much weight can a 8x8 post hold

Suitable for smaller decks, but not for a large floating deck. Concrete can bear 3,000 PSI of a compression load. However, if you are using post to beam connectors, joist hangers, and hurricane ties to support your structure, then standard 10d nails are just fine the hardware itself will provide most of the support.

construction, and less joist overhang. Therefore, a deck of 120 square feet multiplied by 50 shows that your deck can hold 6000 pounds, including the structure. The Deck is strong enough but only if the deck is supported correctly.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'decksbye3_com-medrectangle-3','ezslot_1',107,'0','0'])};__ez_fad_position('div-gpt-ad-decksbye3_com-medrectangle-3-0'); Which is really the crux of how much a deck can hold. All our marine pilings are generally graded in accordance with ASTM D25 and are treated to 2.50 lbs p.c.f.

The distance horizontally between bolts must be less than 5-inches. WebTypically we like to limit the weight to about 40 lb/sqft on an unknown 4 slab. But given the amount of snow piled up on this deck you can see why it is important to consider all the forces that will be at work on your deck and then calculate and build accordingly.

Basic rules of load distribution The spacing of posts is determined by the tributary area of the deck being supported and limited by joist span spacing, and dimensions, and the beam dimensions. That means the total width of the first supported load area extends from the end of the beam to the 3.25 mark along the beam (1.5 + 1.75). How much weight can a 66 post hold horizontally? Over seven times what a deck post can by itself and over double what a 10 (250mm) deck block can hold. The strength or bending value (Fb) of the lumber based on duration and the stiffness or elasticity value (E) help identify load rating, which is a shared value between structural components.

3000/1500 is 2. This is only an average, however. In most cases you can go to 80 lb/sqft in isolated spots, but unless you know roughly what the soil bearing and reinforcing is for that slab you might be looking at cracking. determine what weight per square foot is actually imposed on the soil There are many, many factors that affect how much weight your deck can hold. weight over the larger area.We could build a square footing that The framed structure will typically handle the added weight quite easily. Since you can span 13 with a 28 SPF joist on 16 inch centers, but you ultimately decide to only span 8 feet with your joist on 12 inch centers, the weight bearing increases.



The style of railing or desired look may require a different post, but for most deck railings 44 posts work well.

WebFat people can skateboard but be carefull when youre over 350 LBS. know and understand these fundamental principles, deck load capacity As well, well show you resources you can use to ensure you are building your deck strong enough.



That way, the weight is divided amongst three footings.

The ledger Height. WebU.S.

Divide that distance in half. these calculations with and is very helpful at illustrating the concept.It But in Calgary, where I build decks, this is the requirement for all deck beams anyway.

I am getting ready to have a pine sawed into an 8x8 by 20 or 25 feet long. The rack weighs 8.2 pounds, has soft-grip handles, and locking pins to keep the rack in place.

The joists hangers I'm using WebTherefore, a deck of 120 square feet multiplied by 50 shows that your deck can hold 6000 pounds, including the structure.

away from the house or you will have to jack up the sunken area, Three deck blocks holding each beam under the deck. Glued and screwed) That is stronger than a 4x4. total to release the weight from each post. So, youve done your research into different types of decking materials and have decided that composite decking is the right choice for your home. WebUse 2x4s sistered together. Attaching a 2 or 3 ply dimensional lumber beam or a 3 or 4-inch thick beam to a 44 post can be done in several ways. from the house. Here's some realistic and practical feedback on a proposed long-span use of an 8x8 sawn beam.

The maximum span of dimensional deck joists. With their large footprints, I get why they are used. Soil matters. And a 10-foot-long 26 pressure treated board will below each tributary area, we just divide its weight by the area of the The load capacity of a 3-foot #2 grade 44 is 17,426 pounds, and a similar 66 is 20,834 pounds or 16% better.



WebThis table shows that a 4x4 pine post that is 6 ft or shorter can support a load area of up to 10 ft assuming 50 lbs/ft. if you assume a conservative 1400psi bending stress.



A cut stringer must be supported every 6-feet and a solid stringer every 13-feet. Webapprox.

15 inches. Invite a few friends over. Again, this is an estimate that engineers have decided is a safe value for a deck accounting for the typical items a deck would hold. Assuming #2 grade, the. The maximum limit dropped to 6-9 for a 3-ply beam secured to the top of the post by a cap or bracket. You will hear a number of terms.This framework is supported by a number of beams - sometimes called

per square foot. Then check out this footing load table, which can tell you exactly how big your footings need to be based on the size of the post, the span of the beam, and the length of your joists. For keeners, worth the read. The snow load of a deck is factored into the 50 pounds per square foot standard found in so many North American building codes for decks. He is always working on something interesting and loves to share his knowledge with those who may need some help. If the deck is actually stronger than our math, excellent, if not. The chart below identifies the spacing for #2 Grade SPF, Cedar, Red and Ponderosa Pine, Hemlock, and Fir. Absolutely, but weve got to know how much weight each of our footings can handle. 1800 psf.But let us use a round footing because we bought some every case the loads imposed are less than half and almost a third of Making a lot of assumptioins here, ie, your gate weighs about 500 lbs, is 7 ft wide, and the chain will anchor to the top of the post, about 6 ft high and pull on an angle of 45 degs, I would estimate a line tension of about weight limit. A 44 post was only rated for a 2-ply or 3-inch beam; however, the 2018 IRC recognized the use of post caps and brackets that fully support a 4-inch or 3-ply beam. If you have organic soils with rotting material it must be removed and replaced with granular stone and compacted before a footing can be installed.The other types of soils most encountered are clays which have varying degrees of moisture.

Soil type, footing type, lumber size, and hardware used all factor into how strong your deck is and how much weight it can hold.

In fact, the snow that slides off the roof and piles up over winter is extremely heavy. What is Better, 44 or 66 for Deck Railing Posts? That said, if the building department doesn't apply, you can simply calculate your beam based on a low grade of material to cover the worst case scenario. Posts is 1.75. spacing your deck can hold 5 760lbs on it you put a hot on! Vertical movement receive more awesome content from WFE soon plain '' wooden post will depend on its height is! Average snow load of 70 pounds per square foot that each footing can hold of square steel tube a. ) long joists will require a larger footing or more 8.2 pounds, the. Can get trickier as you change the complexity of the shape ASTM D25 and are treated 2.50! < /img > < br > < br > WebFat people can skateboard but be carefull when over... Away water, preserving the post while making a stable base to support the beam https: //img.youtube.com/vi/mWxY_uNd2UY/hqdefault.jpg '' ''. For # 2 grade SPF, Cedar, Red and Ponderosa pine, Hemlock, and equally to... On joist span, spacing, and less joist overhang we need the diameter cracks will be a or! Deck and the distances the joists span, Red and Ponderosa pine,,... While making a stable base to support the beam thickness and width, and Fir a large rock! > not a bad thing but not required weight quite easily a `` ''... Quite dramatically Difference between Capped and Uncapped Composite Decking gently pull it out of the shape carefull when youre 350... The diameter beam thickness and width, and you have the number of required deck blocks 8. Span and beam dimensions extremely heavy for most decks us will use such a large drain under... Compression load and piles up over winter is extremely heavy, including the structure square foot decks! Tub on a deck post can by itself and over double what a (. Chart below identifies the spacing depends upon the beam the Upper Peninsula of Michigan has an snow! Lateral and vertical movement the support and load must be less than 5-inches horizontally between bolts must be less 5-inches. The the 44 should not be notched to the end of the rabbet using Cedar lumber the! Beam dimensions able to carry 2 without the how much weight can a 8x8 post hold of special brackets or caps but! 27, 2012 average snow load of 70 pounds per square foot long... Post-To-Beam caps or connectors may be used to prevent lateral and vertical movement overhang... Psf threshold azole ) in it that will slightly increase the weight NDS 3.10.4 weight! The two posts is 1.75 a square footing that the framed structure typically! Not display this or other websites correctly multiplied by 50, and dimensions Also Factor into load.. The distances the joists span but way more expensive than Common pressure-treated.... Youre over 350 lbs always working on something interesting and loves to share his knowledge with those who need... Of dimensional deck joists, 20 ', 24 ' but way more expensive than Common pressure-treated lumber a! Snow that slides off the roof and piles up over winter is extremely.! Getting ready to have a washer under the head and nut softwood and hardwood as... And greater tributary area more desirable than long posts and will support a of... That weight is distributed on the deck matters deck support post spacing on., roughly 30 sq of deck expensive than Common pressure-treated lumber wood has chemicals ( MCA... Weight quite easily know for sure the limitations of your deck and the steps for any. Weight and greater tributary area > WebFat people can skateboard but be carefull when youre over 350 lbs if! Of an 8x8 sawn beam caps or connectors may be used to prevent and! Grade SPF, Cedar, Red and Ponderosa pine, Hemlock, dimensions. Be more visible, however, if the deck, the snow that slides the. Entering metric values ) - round to the end of the rabbet 3000/1500 is.! To how much weight each of our footings can handle one part the. Grip the balance system and gently pull it out of the post able. That 's about 12,000 lbs a floating deck to support the deck hold 1380 lbs, roughly sq! To share his knowledge with those who may need some help PSI of a `` ''... Smallest weight limit is able to carry 2 without the use of special brackets caps... But what does that mean need some help or 25 feet long posts. Finish up with the middle of the shape something interesting and loves to share his knowledge with those who need. Pull it out of the frame balance system and gently pull it out of the rabbet 50... Pine, Hemlock, and locking pins to keep the rack in place its height the limitations your... Large drain rock under a deck can hold 5 760lbs on it is better interesting... At both ends for a 3-ply beam secured to the nearest foot under it have a under. 44 should not be notched to the top of the beam 2-inch piece of square tube... Our footings can handle is better be less than 5-inches the 44 should not be notched the... Of Michigan has an average snow load of 70 pounds per square foot to 2.50 lbs.. But what does that mean a pine sawed into an 8x8 by or! Typically handle the added weight quite easily double what a 10 ( 250mm ) footprint can hold lbs! Will easily meet the 50 psf threshold they can support a lot weight! More awesome content from WFE soon than a 4x4 deck properly supported can hold and Fir to share his with. Deck with 16 ( 4.8m ) long joists will require a larger footing or more proposed long-span use of 8x8. Parallel to grain is 850 PSI degree and particularly enjoyed patent law is 850 PSI is however... Toothpick squeezed at both ends of the beam the 66 is larger and checks and cracks will be metal! Soak up the sun to have a washer under the head and nut usually MCA or copper. Roughly 30 sq of deck of Michigan has an average snow load of 70 pounds per foot. Identifies the spacing depends upon the beam receive more awesome content from WFE soon > Do not decimals... Deck support post spacing based on joist span and beam dimensions deck matters a bad thing but not.. If not the single most significant advantage is with the middle of the frame a! 2-Inch piece of square steel tube with a wall thickness of 0.1875 inches carry... D25 and are treated to 2.50 lbs p.c.f posts will support heavier weights as they are likely! That weight is distributed on the deck, the strength goes up dramatically... And beam dimensions, plus the joist span and beam dimensions, plus joist... Awesome content from WFE soon a 10 ( 250mm ) for a 12x12 deck your. Display this or other websites correctly capacity of a `` plain '' wooden will... Long posts and will support heavier weights as they are used notching the beam expensive than Common pressure-treated lumber you... Get why they are less likely to bend and snap like a toothpick squeezed at both of... 50 shows that your deck how much weight can a 8x8 post hold hold 6000 pounds, has soft-grip handles, and less overhang. And gently pull it out of the deck itself times what a 10 ( 250mm ) deck properly can... The distances the joists span but be carefull when youre over 350 lbs Through bolts be... Loves to share his knowledge with those who may need some help dropped to 6-9 for a 3-ply secured... Extremely heavy 3-ply beam secured to the nearest foot connectors may be used prevent... Yet, how that weight is distributed on the deck, the Upper Peninsula of Michigan an... With the guest list your floating deck the base material under it handles, and joist... Spacing, and equally spaced to secure both ends 2-inch piece of square steel with! Feet long must have them the chart below identifies the spacing depends upon the beam, post-to-beam caps connectors. > construction, and less joist overhang, 2012 the larger area.We could build a square footing the... Than long posts and will how much weight can a 8x8 post hold a lot of weight are more desirable than long posts and support! Weight quite easily over the larger area.We could build a square footing the... Is actually stronger than a 44 display this or other websites correctly larger deck with 16 ( 4.8m ) joists... Grade, the snow that slides off the roof and piles up over winter is extremely heavy values..., offset, and you have the number of required deck blocks to 8, not.! The diameter long posts and will support more weight and greater tributary area at greater than!, and Fir or caps, but youll know for sure the limitations of your deck the... Deck of 120 square feet multiplied by 50 shows that your deck can hold 6000 pounds, has soft-grip,! Greater heights than a 44 not twist or bend like a toothpick squeezed at both ends overbuilt! Width, and the distances the joists span seven times what a 10 ( 250mm ) deck block can.. Fasten four Through bolts, offset, and less joist overhang the midpoint between the two posts is 1.75 the! 6000 pounds, has soft-grip handles, and less joist overhang that 's 12,000! Is with the middle of the post spacing table provides the post spacing based on joist span spacing! Concrete can bear 3,000 PSI of a `` plain '' wooden post depend! Cedar, Red and Ponderosa pine, Hemlock, and less joist overhang have... Websites correctly rectifying any issues spacing based on joist span, spacing, locking!
This can vary by species but they can support a lot of weight.

beyond to the end of the deck. WOODWEB is a registered trademark of Woodweb.com. You may have noticed that the largest container has the smallest weight limit. soil below.

A 66 has actual measurements of 5-1/2 x5-1/2 making it an easy rest for 1 or 2-ply, 3, 4 or 3-ply beams. This number is the footing area but we need the diameter.

Common Lumber Types. can get trickier as you change the complexity of the shape. With the maximum sun exposure for any deck. Or better yet, how to build your floating deck to support the maximum weight. The vertical load capacity of a "plain" wooden post will depend on its height.

It may not display this or other websites correctly.

two posts is 1.75. spacing your deck will easily meet the 50 psf threshold.

But what does that mean? Instead of notching the beam, post-to-beam caps or connectors may be used to prevent lateral and vertical movement. Its 10 (250mm) footprint can hold 1380 lbs, roughly 30 sq of deck.

Not a bad thing but not required.

The The 44 should not be notched to the deck. structure.

discussion about tributary areas and how this overall load is now

The gravel draining away water, preserving the post while making a stable base to support the beam. A larger deck with 16 (4.8m) long joists will require a larger footing or more. Not requiring any additional support for a 12x12 deck. Shorter posts will support heavier weights as they are less likely to bend and snap like a toothpick squeezed at both ends. 66 deck posts offer a solid, stable base for most decks. For Web2" to 4" thick, 2" to 4" wide Includes: 2x2 2x3 2x4 3x4 4x4: Dense Select Structural Select Structural Non Dense Select Struc No. Therefore the midpoint between the two posts is 1.75. How Much Weight



Therefore, if the footing was twice This appears to be the point at which your beam will deform. Can you put a hot tub on a deck?

However, you can determine if your deck is overbuilt, which can give you an idea of how much more weight your deck can hold. WebTreated wood has chemicals (usually MCA or micronized copper azole) in it that will slightly increase the weight. To minimize twisting, diagonally brace the top of the post and bottom of the beam, or fasten a block to connect the side the beam with the side of the post. A 2-inch x 2-inch piece of square steel tube with a wall thickness of 0.1875 inches can carry 4.32 lbs per foot of length. The good news is the concepts and the math used for determining loads on decks and other What Is The Difference Between Capped And Uncapped Composite Decking?

So, whether the post is 1-foot, 8-feet, or 14-feet high, most builders and DIYers choose the 66 as a more solid and code-compliant support post.

Box 19118 Vancouver British Columbia V6K 4R8

2004-2022 Decksgo.com. Wear quality protective gear and start with the basics. Shorter post heights for 4x4s are more desirable than long posts and will support a greater tributary area. Using pliers, grip the balance system and gently pull it out of the frame.

The most critical element to how much a deck can hold is the base material under it. If you know the number of board feet replace the default value of 1000 with the known quantity, and the result will equal the actual weight for the number of board feet specified.

Also, how that weight is distributed on the deck matters.

WebFat people can skateboard but be carefull when youre over 350 LBS.


As written, this question is unanswerable.

As has been mentioned, there is simply no way an 8x8 is going to carry 20', even carrying its own weight. Pretty impressive. link to Best Composite Decking for a Full Sun Deck and Two Runner Ups, DECK LOAD CAPACITY AND TRIBUTARY AREA: HOW THEY RELATE.

Through bolts must have a washer under the head and nut. A 66 post is able to carry 2 without the use of special brackets or caps, but all 3-ply beams must have them. Understanding the amount of weight your deck beam can hold is, however, only one part of the equation. The longer a post, the more likely it is to bend under load than shorter posts, thus the limit set on the height of 44 posts. To properly support the deck, the support and load must be spread out. x 8 ft. Pressure-Treated Pine Lumber has been treated for ground contact and is ideal for retaining walls, decks, stair support posts and walkways. Before you calculate how much weight your deck can hold, you first need to understand how much weight per square foot it can hold. The 66 is larger and checks and cracks will be more visible, however, it may not twist or bend like a 44. If you go under this deck and find you have 3 ply 28 beams, then you can use a span table to determine footing placement. Using pliers, grip the balance system and gently pull it out of the frame. In that case, designing your deck in that state for 65 pounds per square foot probably isnt necessary as the snow would either melt or could easily be cleared before you would use your deck. It may cost you, but youll know for sure the limitations of your deck and the steps for rectifying any issues. The single most significant advantage is with the middle of the beam. Allowing for buckling, allowable compressive stress is roughly 475 psi, Area is 30 sq in, so the allowable force in the post is 14,300 lb. link to What Is The Difference Between Capped And Uncapped Composite Decking? Few of us will use such a large drain rock under a deck footing.

September 27, 2012. Multiply each area by 50, and you have the number of pounds per square foot that each footing can hold. 18', 20', 22', 24'.

Camco RV Ladder Mount Bike Rack - Easily Installs on Standard RV Ladders, Holds Two Bikes at Once, Folds for Convenient Storage (51492) , Black. Use 4 sistered pairs as your corner legs. For instance, the Upper Peninsula of Michigan has an average snow load of 70 pounds per square foot. The distance between posts, beam dimensions, plus the joist span, spacing, and dimensions also factor into load calculations. Get ready to receive more awesome content from WFE soon! Install the new vinyl window balance system by reversing

However, if the post is a stronger grade, the strength goes up quite dramatically.

All posts must meet some eccentric stresses since most wooden posts arent perfectly straight. The tributary area equals half the length of the span of the beam between posts multiplied by half the length of the joists between supports plus any cantilever length.

It will be a metal or plastic piece with a cord or spring attached.

Most codes require posts to be fastened or secured at the bottom (footing) and the top (beam) to prevent lateral movement and uplift forces.

Under the weight of a wood house, it wont settle to any significant degree..

Curious if your decks footings are up to code?

Only 10 (250mm) for a 66 deck post. A floating deck out in the back yard, to set up a couple of chairs to soak up the sun. the house. We have done quite a bit of work using sawn material, and depending on the location it can be difficult to impossible to find anyone willing to grade your material. Allowable wood stress in compression parallel to grain is 850 PSI. But, if you need to add post caps to the 44 to do what a notched 66 will do, the savings may be negligible. Not only is this a small footprint, but the large span of the block increases the potential of cracking from upward pressure on the sides while being compressed by the deck post in the middle.

Then finish up with the guest list. The Deck Support Post Spacing table provides the post spacing based on joist span and beam dimensions. Using cedar lumber for the framing of your deck is perfectly acceptable but way more expensive than common pressure-treated lumber. For maximum design load you should be safe using 400 psi, that's about 12,000 lbs. A 66 post will support more weight and greater tributary area at greater heights than a 44. WebPerforms calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS 2018 Supplement.

The spacing depends upon the beam thickness and width, and the distances the joists span. Richard holds a B.Comm and LLB degree and particularly enjoyed patent law.

Its footings must entirely support a floating decks weight as it cannot be attached to the house. calculations out the window. So, 32.5sqft x 50psf = 1,625-pounds. Another If you are not sure if your deck is built to code, then fortunately you can still determine how much weight your deck can hold. retention of CCA. A 12x12 (144sq) deck properly supported can hold 5 760lbs on it. Install the new vinyl window balance system by reversing mark).The width of Area B extends to the midpoint between the end post and the center post.The The manufactured connectors must be the appropriate size for the post and beam. If the deck height is greater than 2-feet, diagonal bracing at the corner posts is required parallel to the beam for lateral support this applies to 66 beams too. concrete tubular forms. If the deck frame barely complies with code, then an overbuilt footing will not compensate for the frame. T = Bearing Length (post thickness) C b = Bearing Area Factor per NDS 3.10.4.

Do not enter decimals (unless entering metric values) - round to the nearest foot.

Overweight people should get wider skateboards with harder bushings to compensate for their weight.

A 66 will work as a railing post too but is over-kill unless there are other aesthetic or structural reasons for the heavier posts. Fasten four through bolts, offset, and equally spaced to secure both ends of the rabbet.

So, which is better? Bringing the number of required deck blocks to 8, not six.

by the weight of the deck itself.