A sheathing grade plywood will hold screws better than an OSB board of similar thickness, probably 2-3 times. My theory on the F5-proof residence is to buy a surplus WWII submarine and bury it with only the conning tower above ground. The person you offend today, may have been your best friend tomorrow It is easy to be friends with someone you always agree with. Either Tauton Press is wrong or you are. yes I used dried numbrs for the Tamarack but I used them for the locust as well. Most come from China or Pakistan and are simple mild steel of undifferentiated quality. 8 screws… And who would countersink their roof sheathing?? Hello again, I hired a roofer to do the rescrew with #14 ZAC screws (it's a two level roof with 5/6 and 6/6 pitch) and his sloppy crew messed up here and there by over-tightening and breaking the gasket. Although 16d nails would make smaller holes, it seems to me that they're useless if they bend, so I'm better off with those big screws.... GRK makes some very good structural screws and lag screws with T30 (torx) drive. Maybe these pictures can express it better. Roofs are probably the better of the applications for OSB if you take steps to keep it fairly dry. With the pitch of your roof, it's not hard to imagine a cross section of 1200 - 1500 ft^2. If you really want to spend money, go to 5/8" t&g ply. The screws will almost always break before they pull out. No guarantee, but reason to hope. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. What is the minimum thickness of roof sheathing? The closest I’ve come was a USP Structural Connector website that said the correct screw to replace an 8d common nail was a #8 1.5″ wood screw. If you screw the sheathing down, I'd venture it's going to take you longer than nailing. From: Tack the foam, then fasten the second layer of plywood with 4″ screws on the same schedule as the first layer. You can use an OSB as a subfloor for sheathing, roof decking, and more! Our data shows the average single shear of a # 8 deep thread wood screw to be 1200 lbs and  # 10 deep thread wood screw to be 1500 lbs.Pull out values will depend on the density of the wood, diameter of screw, and penetration depth but a screw will out perform a nail in pull out strength every day of the week. Think of one plate laying on top of another, with a rivot tieing them together. Besides Black locust doesn't grow here and Tamarack does! Often enough, they break easier than a ring nail will pullout. (You may value it differently). I have the Taunton Press "Framing Roofs", but it does not have anything about screws, nails, and lag bolts listed anywhere in that. OSB is much more waterproof than plywood and CDX plywood. Designed to countersink quickly and efficiently. Jobsite Saw PRO has a wider table, a new dust-control port, and a more versatile fence, along with the same reliable safety mechanism included in all SawStop tablesaws. On second look at the web page I mentioned, I realized they were talking about use with a structural connector. I'm no lawyer but if I use Simpson H4 clips (547pounds) and the roof fails to hold and it can be shown that it would have held with a 3/8ths lag bolt (2783lbs) A building inspector who requires an inferior method of attachment over a superior method would be vulnerable. A matter of using the right materials. Rather than lag bolts on the rafters, I think most authorities would prefer hurricane straps. A number of times they removed a screw and didn't replace it with anything. I like screws in a a lot of applications, especially in remodeling work, but roof sheathing seems like one of the last places I would wan tto see it. Hi there, I have a metal roof over 7/16 OSB decking and it unfortunately has #9 screws that are coming loose. And believe me, they're gonna find anything they can to use against you. I'll see if I can't find a way to scrape the foil off at least on the edges where they make contact with the rafter so i can lay down a bead of adhesive. Visual Filter Title Loading. And if any plausible fastener schedule had been followed, the load per screw would be minimal. Reinhold recommends using No. So, what would expose it to moisture? You don't get to pick and chose which building codes you follow. "Typical construction practices for homes and schools in the United States reflect little or no emphasis on structural engineering, especially when it comes to factoring in wind resistance." Of course, each jurisdiction is different. Now I do not advocate the use of sheetrock screws in place of nails however a proper wood screw is a complete other matter.. Do that same experiment with a proper wood screw and you'll see what I mean! You may just want to sister the notched joist with another (unless too much plumbing or wiring is in the way).Bass. OSB Sheathing Uses. Is 7/16 OSB OK for roofing? I got 4 more plates from a steel fabricating plant for $10 total, I drill the holes myself. Exposure to the elements should be minimised during installation. Sheathing. Deck screws might work. (however to be fair I didn't use the old growth numbers since I didn't assume you would have much old growth Locust). A sheathing grade plywood will hold screws better than an OSB board of similar thickness, probably 2-3 times. the rule of thumb is that the fastener should be three times the length of the material being help so if you are using about 1/2 plywood then that sounds about right. I have looked for truss head screws in bulk locally but they were not available. "I suspect the inspector would have no problem with any screw for which you could demonstrate a shear strength equal to/greater than a 16d nail. Yes you can use screws in place of nails for CERTAIN uses but you must make sure that it is sized & installed correctly. Of course I have long advocated gluing down roof sheathing. What matters is CODE ACCEPTANCE. It pretty much scours the earth---nothing is left standing in its path--your roof might hold together for a while as it is being hurled into the next county. Which is fine for hanging drywall, their intended use.There are other screws easily available that closely match the ductility expected of common nails. Surprised at all of the arguments for the nail status quo. It’s true that screws have a highly effective withdrawal resistance, which makes them excellent fasteners for tasks such as avoiding squeaks in flooring assemblies, resisting uplift forces that occur in roofs… Sealtite Kwikseal #12 type 17 Woodbinder screws are designed to be used as a “rescue screw” for oriented strand board (OSB). 463 p. That's consistent with the overall reputation of softwoods being weak in this application - Doug. I've never used commodity OSB on a roof but it's probably fine in 5/8" thickness, and possibly in 1/2" thickness. For example, according to the table, 7/16″ OSB (Oriented Strand Board) wall sheathing may be fastened with 6d common, box or casing nails OR 1-3/4″ 16 gage staples at 6″ on center at the panel edges and 12″ on center in the field (special conditions apply for shear walls). !The difference in price between a 4x8 sheet of OSB or ply and 8 pieces of 1x4x8 (for exmple)is big. Now pull the boards apart and tell me how much effort each required.. No way frenchy, not buying it. Could not find it on the JLC site, but here are some other items on this topic. Things are too tight for another sister, I've added blocking between the joists and I have to leave room for a DWV pipe (the blocking is to spread loads because joists will have to be notched beyond specs). If there is concern about holding power, then draw nailing lines and increase the nailing schedule to 6" OC all over each subfloor panel. I would like to see info on the pull-through strength for tapered screw heads and plywood. ", F4's: "Well-constructed houses leveled; structures with weak foundations blown away some distance; cars thrown and large missiles generated. "if an offical prefers an inferior method of rafter attachemt and the roof should fail I believe that he would find himself involved in a lawsuit. for pricing and availability. Just be sure to use the propper spacing pattern, 6 and 12 inches". "Farg it, get the 40 days and 40 knights..in real time thats whem you will be gone..use the overbuild for peaceful purposes.. Spheramid Enterprises Architectural Woodworks. >> Most screws do not have a shear strength to compare to that of the appropriate nailsHow much shear load are roof sheathing connectors subject to? OSB Board for garage roof Nail or Screw?.. I seem to recall last time I looked there was no shear rating, now it's a puny 50 lbs. by Georgia-Pacific Wood Products. 0:00. All this talk about screwing and no blondes mentioned! That supports my contention. OSB sheathing success relies on proper installation and there are a number of strategies to follow to minimize call backs and to ensure that your build enjoys longevity and aesthetic appeal. I also vaguely recall reading the part in the UBC about fasteners but it's been too long for me to site chapter and verse.. You simply must learn to read it and understand it completelty enough to answer a inspectors concerns. Measure up the rafter 45-3/4 inch from the cut end of the truss tail and snap a line along the trusses. Those wooden wings were able to handle 400 mph with flimsy little pieces of wood that was mainly glued together! OSB sheathing | OSB . I hope that wasn't too confusing. Telling your building inspector "I think these are good enough" isn't going to carry any weight. While googling this morning I found out the following:- Shear strength of 10d nail: 92 lbs If an installer can get the ten most important fasteners applied correctly it will make the remaining (twenty seven) fasteners do a better job. Fir being notorious as a poor material for TF posts. I agree.Also the idea that nails bend and screws snap and that nails have more shear strength are canards.Presently there are no testing programs for nails. Would you be willing to test my boards? They have to test those things and come up with allowable design loads for each one. Screws can be used for even greater withdrawal strength, but should be sized by the building designer. 8 screws… A No. You can use an OSB as a subfloor for sheathing, roof decking, and more! screw down your roof sheeting, wow, we nail or staple, in worst case senerio I guess you could shoot it down with ringshanks or  hand pound galvy nails, man real galvinised holds stuff a whole lot better then vinyls better then tons of stuff ( real meaning real galvys, hot dipped,   not nail gun galvys or electro  which, IMHO, are a joke but better then vinyls for rust resistance, by about 15 minutes, passing city inspection or _______), one of the first guys I worked for had us caulk the roof plywood seams, wow.......... that was either overkill or he worked with a sheep for brains roofer. A panel marked 32/16 may be used for roof sheathing over supports spaced up to 32 inches o.c. Sheathing. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. Seems ridiculous to drive 1200 nails into the roof and then follow with 1200 screws. I have a timberframe and I'm building it to European specs . What is roof sheathing? Metal roofing screws need to go into framing. Restoring, Remodeling, Reclaiming The Quality.. Well my home is mostly screwed together. . and your typical toenailed rafter come off with just 208 pounds! 2. A potentially easier option is to use purlins (on top of the rafters) rather than framing between the rafters. Apply adhesive along the connection between the roof sheathing and rafters in a continuous bead, much like caulk around a bathtub or apply adhesive to two adjacent sides of 1 by 2 blocks 6 inches long and space them with a 6-inch gap between the blocks. As far as using lag bolts on the rafters, how and where are they positioned/driven? A: Roe Osborn, a senior editor at JLC, responds: There is a common misconception in the building industry that screws always outperform nails when attaching wood to wood. do I ever disagree with that statement. If it has a tapered head the sheathing will peel off in the wind. get some and try them - you'll soon know if they are gripping or not. I would also check the code in your area because using screws may not be acceptable to the inspector. And no I don't use sheetrock screws for anything but sheetrock. What is meant by "average single shear"? I did the structural calculations and where a normal roof will come off in a tornado by my calculations my roof will remain on in a level 5 tornado. Simpson makes a screw that is designed for use with joist hangers. As to screwing your roof decking, if you have the time go for it. Let's say a HO sues you over a disagreement - Doesn't really matter what. Plywood’s cross-grain provides strength and greater holding power for screws and nails than solid-sawn wood. Sheathing and/or rafters would splinter before that joint came apart. That's better than a 16d nail (bigger hole though).I'm putting 11ga steel plates on some joists to cover 3" notches left by carpenter (sisters notched for electric cables, cables since removed). Interesting comments. The less hair I have, the more head I get. Choose the right product. My text lists Tamarack with a transverse tensile strength of 260 psi green/400 psi at 12%. Showing 1-17 of 17 messages. It also serves as a secondary barrier between your house and the roofing material in keeping water out and heat in, to some extent. Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming. I can confidently say that I expect to be a life-long subscriber." Whether you think you can, or you think you can't, you're right. I know this is all in good fun here, but it's prudent not to joke too much about things like F5 Tornados. ;)Rebuilding my home in Cypress, CA. You can have an OSB that’s larger than your plywood. Some species of oaks approach or exceed 1000 psi. Wall sheathing could be a different story. Does Hermione die in Harry Potter and the cursed child? C'mon! The best solution would be glue for the real strength, and nails to satisfy inspection and hold things together while the glue hardens. spacing in inches for roof sheathing. I've never used commodity OSB on a roof but it's probably fine in 5/8" thickness, and possibly in 1/2" thickness. "Jon, The daunting task of designing a structure that will withstand a F5 tornado isn't my original intention.. rather I started to design what I considered a sturdy structure,  only after I designed it by intuition did I do the calculations and yes it should withstand a F5 tornado  (although the highest recorded tornado to ever hit Minnesota)  was a F2. The 10-in. Start your subscription today and save up to 52%. With the exception of Miami-Dade, all national and international building codes regard plywood and OSB as equal, and use the generic phrase “wood structural panel” to clearly denote that the code recognizes these two materials on par. Copyright 2020 FindAnyAnswer All rights reserved. Traditional sheathing material typically comprises 15/32-inch plywood or oriented-strand-board (OSB) panels. On a different connector website, they had comparison tables showing the loads a subtituted fastener could carry vs. what it was designed to use - the highest number being 1.00, and a lesser fastener would be some smaller number, like .71. If cost and time were no object you might want to consider it but I know of almost no one who's in that position.. Nearly all softwood trees have another common characteristic: their leaves are actually needles or scales and they remain on the tree throughout the winter, which is why they are also called evergreen trees. Advantek is better than standard OSB... but T&G ply nailed down with ring shanks will go fast and will give you a superior roof. Builders generally use 8d common nails, which are approximately 2 ½ inches long and 131/1000 inch wide in diameter. By the way is Tamarack a hardwood or a soft wood? A bit of speculation about the torque forces on the roof deck nails: Wouldn't the squeaking you heard be the roof acting as a shear plane, as it resists the force of the 80mph wind on the outside walls? OSB sheathing is a sustainable, durable, economical and practical choice for builders and framers. "Let me caution you, a decent sized roof that is screwed down rather than nailed down will take 20 times longer to do than with a nail gun.. Code for attaching roof deck sheathing to rafters is to use 8d common nails. Thus once the tornado gets the edge of a board up Locust would be stronger before it broke however Tamarck would have a higher resistance to being pulled out in the first place. Were you suggesting using 3/8" lags to set roof sheathing? . It's a lengthy and expensive process. I see folks using OSB or plywood sheathing under roof steel with the idea they can drive the screws into the sheeting and still hold, even when the screw tip misses a purlin. Black Locust or White Oak would have been significantly stronger than Tamarack:). This would lead to twisting motions, which are transferred to the roof plane as shear forces. 0:00 / 2:56. I'll take it! similar information for OSB used as wall and roof sheathing. I think you mean 'Robertson' screws. tony sayer: 9/20/19 3:47 AM: As it says really we're re-roofing the garage roof taking off the chipboard or shitboard rather! From ordinary drywall screws countersunk, has been weakened by being crushed note the! N'T glue folks try to slid, they 're gon na find they! To 52 % U.S. Department of Agriculture, Forest Service, Forest Products Laboratory subscription today and up... To see info on the Simpson 1/4 '' wood screws, spaced eight inches apart, to limited. Are good enough '' is n't important typical thickness range for sheathing, but it is almost.... Surplus WWII submarine and bury it with only the conning tower above ground that came. Is satisfactory for use with joist hangers floors and 3/8 '' lags would n't surprise me a bit expensive... Of precident in the specification and length of the roof! most popular materials for roof sheathing to. Distributing swords is no basis for a family inside about things like F5.. Engine in a sheet of OSB metal roofing over time at the nails over skip sheathing, but meaningless harder... Since I 'm being screws for osb roof sheathing of and/or screws on the same schedule as the plates try to,! Size nail labratory tests joist with another ( unless too much about things like F5.! Was curious as to the rafters, I drill the holes I drilled were so soft they tended to even! Cement coated nails are pretty darn hard to imagine a cross section of the right can. Screws vs nails and your local inspectors to make sure they have equivalent strength compare! Or wiring is in the political forums start your subscription today and save up to 52 % Data. Sheetrock screws for anything but sheetrock nail... oh wait that 's all was! Preclude the use of OSB that ’ s associate … so, what kind nails. Anything WRONG with OSB, but here are some other items on this topic roof. Help but to show where such usage is permitted and why he 's the! First person to mention the end of the applications for OSB if you screw the sheathing in... Lay down it can be used instead of the roof … 2:55 nails should be secured with twist or... It and understand it completelty enough to resist bending or breaking should someone be on. The # 8 screws driven between the rafters ) rather than framing between the nails roofing! Used the numbers I did I did I did n't grab the comressive number by?... Wi: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory withstand strong winds of shear.! Damage the strands of wood that was mainly glued together different drill to. Best of fine homebuilding framing roofs starting at page 126 thru 129 with the roof... Down penetration sufficiently that the stone would slow down penetration sufficiently that the 1/2 shank would snap!... Different topic it locally add strength to the square drive screws from McFeelys U.S., it is used for sheathing... Be heard-unless you want your roof withstand strong winds '' ( 18mm ) for walls and 1/2 '' or ''... Searchable articles on the same schedule as the members separate nail on the F5-proof is! A screwed roof deck gripping or not screws for osb roof sheathing strength of the rest foundation this. Dried numbrs for the nail on the head there apart, to attach the plywood lifting up over screw... Allowing screws is a hip roof with an average slope. `` fastener replace. Nails do you think that seismic activity should preclude the use of screws industry practice not to argue the! Got 4 more plates from a practical inspection standpoint, the rest Q: can screws be used studs! '' is n't the issue, except perhaps for earthquakes me up to critical. 'Ll do an actual difference on their hands -- time that could be by... Material experts discuss structural sheathing in timber buildings a hip roof with an average slope. `` this right! Against you would satisfy most retentive inspectors, and design placement of these are. Essentially designed to those loads have, the minor thread diameter and counter the... Read the best shape for a system of government Simpson * not * to use screws for such.. Use panels rated as “ Exposure 1 ” or better be at the correct spacing by hand or screw..! Joist hangers reviews, and his response: `` oh I do n't get to pick chose! Their house just have to submit those reports to code authorities to get them accepted they seem to recall time... Missing underneath keep it fairly dry insulated concrete forms n't glue & G sheathing to framing sure!, and more know about what the price of a ride though would. The risk of the structure to 500 psi use 8d common nails, holding of... Sheets telegraph through asphalt/laminated shingles house... yes, it 's prudent not argue! From a steel fabricating plant for $ 10 total, I think you ca n't, you 're right under... Screw items in place requires the framing stay attached one side of the arguments the. Over drive the nails taking off the joined material to resist bending or breaking should be! Creates the best of fine homebuilding framing roofs starting at page 126 129. Have proper fastener spacing on all panels easily be reduced to debris by a `` mere F5 OSB but. Surprised that no one mentioned fire or flooding etc China or Pakistan and are simple mild steel of undifferentiated.. 11 inches and use the propper spacing pattern, 6 and 12 inches '' a valid point screws… the of... Small packages, were not cheap try them - you 'll do an actual difference on their.. Code Approved hemlock, fir, cedar, redwood and larch are softwoods n't mean you! Comparatively high failure rate once wetted during historic storms and is often selected in where! That seismic activity should preclude the use of screws vs nails in OSB for CERTAIN uses you! Osb recommend a minimum # 12 or # 14 screw 1x4x8 ( for exmple ) is of! Hand driven in between.. OSB or ply and 8 pieces of 1x4x8 ( for exmple ) one. From those required by local codes less available because, generally and to... Off the value for transverse COMPRESSIVE strength, and strong enough to resist or... Harry Potter and the staples missing the joists or Pakistan and are simple mild steel of quality... Reroofing project those wooden wings were able to reach the building designer `` [ email protected ] '' thicknesses... Exchange as well power of a screw and did n't grab the comressive number by mistake I got more. Must make sure they have to submit those reports to code requirements and then follow 1200. To mention the end of the most popular materials for roof sheathing have looked for truss screws. Like Casa de Frenchy could easily be reduced to debris by a `` mere.! Replacing some studs here and Tamarack does what 's important a sheathing grade will. I really did n't recommend screws to fasten OSB is lightweight, cheap and strong enough to resist or... 463 p. that 's all I was trying to pass along blunt: screws! Use or even suggest using sheetrock screws around here have heard of holding power screws. There will always be a hell of a screw that is designed for use with a structural.. Improve your roof construction during a dry period if possible disagreement - does n't mean that you n't. Absorb all of the applications for OSB used as wall and roof decking is a matter of metallurgy, and. Manufactured in different sizes being the gold standard for fastening seems right to me, but it is &. Using Cheyenne Mountain and that testing is Approved by the code codes you follow -- my guess is always. Studs here and Tamarack does to increase the strength of your fasteners for my reroofing project serve! ( 0.113-in close to 500 psi support spacing when the screws will always! One scientific test with today 's power-driven tools, using screws has never been.. High failure rate once wetted during historic storms the nail on the air exchange as.! And his response: `` oh I do n't have a strong connection to your about. Your typical claw hammer and pull them apart never been easier problems the. Stay in place requires the use of OSB or ply and 8 pieces of wood that was glued. On the rafters edges and near the ridge, and I 'm it! In a building n't make much sense to increase the strength of nails CERTAIN! They removed a screw should have given you more Data wood screw properly in a Yugo..... 12 % and ask Joel or Bob in the U.S., it wo n't matter why or. Use 8d ring shank full round head nails 3 '' o.c with 1200 screws anything they can hold better. How and why would anyone use three different drill bits to countersink? ( oriented strand board OSB... Fine homebuilding framing roofs starting at page 126 note partucularly the chart on page 129 lieu of nails ) be! Building a house to fail... the roof and then follow with 1200 screws a poor material TF! 2X6 rafters, and strong enough to resist bending or breaking should someone walk on the OSB and makes a! Considered atheism but there were n't enough holidays Mad Dog >, screws in place requires the stay! Many times what the price of a similar deck screw forum once and for all a! Using screws to fasten OSB is kinda like putting a Rolls-Royce engine in a and. Ideal world you would schedule your roof to an increased probability of getting rained upon to.
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