0000013039 00000 n If you find out that the nails are deeply driven, you can remove it from the back. Smooth Shank. SG = specific gravity of oven dry wood D = diameter of screw (in) Example - Screw Withdrawal Load trailer h�b```f``2c`b``�e�c@ >�r80(�8�֑����ͯ.o�u6����k�k�Hx�H�GJDbIDJ C�rC�G�EC�D[GG�n��r[ā4s�-|� t�3s.���b/p.f� �Qa`�������k| |�Up�30�݆�2J ��$� What you are doing is a better option than adding more plywood everywhere. Engineer of Record shall be consulted for actual design. The plywood could not be pried or driven apart from the 2X4 without destroying the wood, each nail had to be removed with a slide hammer nail puller or cut with a sawzall. Find out the nail on the back of the surface and grab it with a nipper. The results of the tests indicated that the reinforced plywood’s resistances to direct withdrawal of the screw, screw-head pull-through, and lateral nail resistance were significantly higher than those of the unreinforced plywood. 0000005236 00000 n 0000000016 00000 n h�bbd``b`:$�@�# �� o.������5,�$v^��/ޢ�*� In addition, reinforcement of the plywood … However, a three-quarter-inch piece of plywood provides the screw with a pullout strength of about 197 psf. j"?�C{�2MV�X�jVd�*R�ػ�)aD�F�Ȇ They're not coming up unless you use that cat paw to slightly lift the head then use a 36" gorilla bar to pry them out. This is the main objective of conducting soil nail pull-out test. An 8d finishing nail and an 8d common nail are about the same length, but have different diameters. Pound the nails in with a hammer and then tap them in flush with a nail set. Or just cut out the plywood like you already mentioned. Lever it out. Generally the nails are no longer than 1 inch, but if they will be going through drywall, increase the nail length to 1 5/8 inches. 0000002937 00000 n A wet-use adjustment factor of 0.75 is recommended for applications subject to … Having a nail blow out the side of your workpiece is not only extremely frustrating, but it is also a fairly common problem. %PDF-1.6 %���� The purpose of the testing was to determine the influence specific fasteners and sheathing thicknesses have on the pull-out values for nails used to attach asphalt shingles. Because it is very thin it is easy to get under the head of a nail, then simply lever upward to pull the nail out. Spiral Shank. Find out the nail on the back of the surface and grab it with a nipper. per inch of wood under head Takes into account fastener and wood interaction However, if this target is to be achieved, the test nails should be loaded to determine the ultimate soil/grout bond with a upper limit of 80% of ultimate tensile strength of steel bars. Nails slide between wood grain, and builders depend upon the grain's compressive force to resist the nails coming loose when pressure is placed upon them. F = allowable withdrawal load or force per inch of penetration (lb/in). where . 2002;Simeonova 2015;Bal 2017). The nail tip will either blister the surface of the plywood, or come completely out … (ii) To determine the bond strength between soil and grout for future design purpose. Pull nails from the back. Plywood strength drops when thickness diminishes. 0000003225 00000 n $X���L��,Ft�?c�� �� Wood-to-wood, wood-to-concrete, and wood-to-steel connections are possible. Blowout is typically observed when nailing one piece of solid lumber to the edge of another piece. The reason is that fiber distortion is less uniform in plywood than in solid wood. Data for pull-through capacity for nails and screws in plywood and OSB. Nail Specifications. before bending. Screw shanked nails were hard to pull until they were almost all the way out. 4. Allowable withdrawal load or force of a common wood screw into side grain perpendicular to the fibers of seasoned dry wood can be expressed as. The length of time the nail is in the wood. In today's lesson we are exploring the four most common types of nail pullers. 0000001499 00000 n 0000009179 00000 n 122 0 obj <>stream (c) 5-ply applies to plywood with 5 or more layers; for 5-ply/3-layer plywood, use values for 4-ply plywood. They are inexpensive but after several years they have a tendency to loosen up and begin to pull out as the plywood shrinks. Professor Poo Chow, a researcher at the University of Illinois, studied the withdrawal and head pull-through performance of nails and staples in plywood, waferboard and osb. In the United States, the lengths and diameters of some types of nails are indicated by their size in pennies. H��W�n�8}�W�\@4��b9m��n!�[�}H�dۢu���b�~gH��d]��5Μ�sH͋� �OD�t�� "��-�$3����0{�-���-y�l�.VK���X,�~μ�̯g��B��=9��Kr����cWq�r�����,Qt�`W/�!N�i�v���Ì&��\�ڵB��v�斾c�ͨ��,��t�� �����်0`����Z�Z pd �"*�$��hdzԑ�p%l�`��T��W��rs�tJ� �{�C��kČ~d�)�mz�W?\��l��~ZY\�Y��ƛ�Y��E�0�f�b;���TA���H�,v1�y����Bb�=�T�nlg����2nlv���ڌ$�HͅN�E,��;����E�~ ���_n�h���K�i��}�I�]n������Eq Design Strength Properties Design Shear Strength Approx. Fastening of Plywood The nailing characteristics of plywood are not greatly differ- ent from those of solid wood except for plywood’s greater resistance to splitting when nails are driven near an edge. on the lateral nail strength values of plywood panels (Stewart 1987, Morris 1968, Pirvu 2008). Spiral Shank. As simple as that. OSB/Plywood 0.5 340 390 173 Withdrawal (Pull-out) Capacities (pounds per inch of thread penetration) Assumptions:-Tabulated values above based on American Wood Council, NDS 2005 Table 11.2A-Information for reference only. 0000007923 00000 n x���A 0ð4�p\Gc���������z�C. endstream endobj 114 0 obj <>stream Smooth shank nails offer the least pull-out resistance when compared with spiral and ring shanks. Included in the following tables are ultimate withdrawal and lateral loads for plywood joints fas-tened with wood and sheet metal screws. 0000004226 00000 n )���b/��f����wf,ɲ���-�=�Ǔ4z��� &�c���`JeL*0i��IS�����Q��f�d ����n�U۳B>.ן�z�處���+%%�4�|ô�UۏF��<7l��aJ(%D�H��rY7��]]6��r].+N�/�d�黪�.���[� �3!�U_6�t�Λ� ~�W�;��}^W�ĺzݯ:���5�\^�fpw��}l��Y���}��M瓺���E�A���t�p8�s�=�1���{�n����D:�z�/6��7��#hc�19���幅��Lk������R@Sa1�U�@s)�� �S �ډ _�S���q��Ȳ��"�ʅ��D�FJ8~# �����#�.��� �0ߎx �l��H�})"р���-���|�s��'x0��ӆ[}qk�������B��f���LV�c.~z����Y�"^��t���M*��#�dm�v�����B�����g s�F�+�#������*��U�N��`�jf'�վ���q����g�+�2�������l��Hִ�c�_]���t�5��P^!���\y �#�D^�#���'����� :�$�����>ʉx�{���9�(=.�>ߛ������;%�� �o��/�-vC� �/�ny�)� ^�j� strength and stability, each joint requires a design adapted to the fastener type and to the strength properties of the individ-ual structural members. 0000003865 00000 n F = allowable withdrawal load or force - lb per inch of penetration (lb/in). Common nails are stronger than box nails because of their greater diameter (below). startxref (d) Strength axis is defined as the axis parallel to the face and back orientation of the grain (veneer), which is generally the long panel direction, unless otherwise marked. Species and Glue. If you … Place the nails that you’re adding to the edge of the plywood at least 1/2 inch from the edge. They are best used when nailing solid wood boards and not plywood. OSB/Plywood 0.5 340 390 173 Withdrawal (Pull-out) Capacities (pounds per inch of thread penetration) Assumptions:-Tabulated values above based on American Wood Council, NDS 2005 Table 11.2A-Information for reference only. 3 Table 1. SUBSCRIBE! The nail withdrawal resistance of plywood is 15% to 30% less than that of solid wood of the same thickness. k/|/�,w��O�u�mtw��#2Һ��Q5��)M�倩�M�?,�I��������HgH*%�g��Q�z4'��k�3��. Lateral strength is largely a function of a nail’s diameter and the density of the type of wood into which the nail is driven. Chow found that in both dry and 6-cycle aged tests: osb and waferboard performed equal to or better than CD-grade plywood. The sheer strength of nails are just as good, and, with today's commonly used sheathing materials, the fastener will generally pull thorugh the sheet, before comming out. The requirement that nails intended for use in engineering construction be specified by length and diameter was introduced in the 1986 … This may be insignificant in itself, especially considering the number of screws holding a single panel to the studs. Holding strength of screws in plywood have been studied by some authors (Erdil et al. Sounds like you have screw shanked nails. h��VMk1�+:����J!`�5 �94! xref A standard nail shank is smooth, also called a bright shank, but modifications have been developed to increase holding power. 0000002975 00000 n 0000004769 00000 n SG = specific gravity of oven dry wood D = diameter of nail or spike (inches) Erdil et al. 0000002780 00000 n To do that, use a nipper tool. Common nails are stronger than box nails because of their greater diameter (below). by Mark S. Graham NRCA has just completed limited testing of nail pull-out resistances in plywood and oriented strand board (OSB) roof sheathing. If you need specific pull-out data, check with the nail manufacturer. BOX VS. COMMON NAILS. <<901C3CF3558FFD4A97EF5E77A42560CC>]>> Fastener type dhead mm t mm ρ kg/m3 ni Fhead,obs N Vobs Fhead,model N Δi Ref. 0 The property tested here that showed the greatest increase in the reinforced plywood panels was the screw head pull-through in both the maximum load and displacement at maximum load. Pull nails from the back. Data for pull-through capacity for nails and screws in plywood and OSB. Smooth Shank. Engineer of Record shall be consulted for actual design. 0000001285 00000 n 0000000894 00000 n Tests comparing pull-through strength between plywood and OSB indicate that 17 pounds of force are required to pull out a nail from plywood, but 15 pounds of force from OSB. Lateral strength is largely a function of a nail’s diameter and the density of the type of wood into which the nail is driven. For plywood less than 12.5 mm (1/2-in.) Holding strength of screws in plywood have been studied by some authors (Erdil et al. For example, 10d and 12d nails have the same diameter and the same lateral strength in each type of wood. Included in the following tables are ultimate withdrawal and lateral loads for plywood joints fas-tened with wood and sheet metal screws. %%EOF BOX VS. COMMON NAILS. 2002;Simeonova 2015;Bal 2017). NDS Table 11.3.2B provides Dowel Bearing Strength of Plywood. Lever it out. per inch of thread embedded * Design Head Pull-Through Strength Approx 100 lbs. 0000007107 00000 n 0000001915 00000 n 4c��cȫ��̭X:o�p��! Annular ring or ring shank nails have a series of raised rings around the shaft, which compress wood fibers, making it more difficult to pull out of soft- and medium-density wood. 1862 0 obj <> endobj endstream endobj 1888 0 obj<>/Size 1862/Type/XRef>>stream thick, the greater splitting resistance tends to offset the lower withdrawal resistance compared with solid wood. How the nail is driven, in relation to the grain of the wood. Box nails resemble common nails but are thinner to keep the wood from splitting when driven. Erdil et al. Based on the test results, the recommended allowable nail withdrawal strength for plywood and OSB panels, expressed as an equivalent specific gravity, is 0.40 for plain or screw shank nails and 0.70 for ring shank nails. This 3-inch on center nail spacing increases the strength of the holding power of the nails and the plywood. [���o`�)Df(�c��u���}47N�lv�]�oH�F0�c�טg�IJ��,)��Q�~�0�,cY�-�`�w(�9��J��� �K~#�%r����Nؒ4c�"�\�ɋ�T��Ds��nGYJٛ�5���������p������]ʦ�3�Π��h�YӍ{i���P����X����#V�e��x�Av8)|���a�zr� 0000003303 00000 n 1862 28 * #8 deck screw in SYP Design Withdrawal Strength Approx 100 lbs. For example, 10d and 12d nails have the same diameter and the same lateral strength in each type of wood. The plywood could not be pried or driven apart from the 2X4 without destroying the wood, each nail had to be removed with a slide hammer nail puller or cut with a sawzall. 150 lbs. If the earthquake forces exceeds the strength of the plywood-lets say the plywood is nailed to resist 10,000# of force-and that plywood tries to resist 15,000# of force, you will get nail pull out … Fastener type dhead mm t mm ρ kg/m3 ni Fhead,obs N Vobs Fhead,model N Δi Ref. 0000042117 00000 n 0000001638 00000 n %%EOF With this nailing pattern and using 8-penny nails and 15/32"-inch thick plywood, it would require 490 pounds per square foot of pressure to pull the plywood from the wood wall studs. For example; a 12-by-36-inch piece of 1/4-inch plywood will only support about 5 lbs. Using Nails on Plywood. Consequently, it can be said that the effects of reinforcement with glass fiber fabric on the screw and nail strength of plywood are not very high. The main factors governing the withdrawal resistance of nails are, The wood density, The nail diameter, The depth it penetrates. nails for sizes less than 10d, is the same for the 10d to 16d sizes and is smaller for sizes 20d and larger (70). As simple as that. 0000004992 00000 n where . 0000010368 00000 n Smooth shank nails offer the least pull-out resistance when compared with spiral and ring shanks. The nail withdrawal resistance of plywood is 15% to 30% less than that of solid wood of the same thickness. Nails driven into the end grain for instance will easily pull out. 110 0 obj <> endobj 6,9 11,1 400 30 1095 0,12 1437 -0,27 3 Allowable withdrawal load or force for a common nail or spike driven into side grain perpendicular to the fibers of seasoned wood (or wet unseasoned wood) can be estimated as. %PDF-1.6 %���� ... bending properties of nail, pull out strength of nail from wood, nail-head pull-through resistance. 0000008564 00000 n If you find out that the nails are deeply driven, you can remove it from the back. A spiral "thread" on the shank causes the nail to spin during installation, creating a thread-like interlock with the wood, which increases withdrawal capacity. 0000002273 00000 n Plywood Clipped 2 3/8 pw.n. Both lateral (single and double shear) and withdrawal capacities can be determined. F = 2850 SG 2 D (1) . 0000009794 00000 n endstream endobj startxref A spiral "thread" on the shank causes the nail to spin during installation, creating a thread-like interlock with the wood, which increases withdrawal capacity. To do that, use a nipper tool. 1889 0 obj<>stream 6,9 11,1 400 30 1095 0,12 1437 -0,27 3 Provides users with a web-based approach to calculating capacities for single bolts, nails, lag screws and wood screws per the 2015 NDS. strength and stability, each joint requires a design adapted to the fastener type and to the strength properties of the individ-ual structural members. "screw" anchors into plywood and rely on the withdrawal values of "nails" at the framing members below into which the plywood is anchored. 0 Ring shank nails, often used with softer woods like plywood and shingles, provide a tighter, more permanent grip than smooth-shank nails. My response to that would be yes, if the screws used have sufficient achorage values into the plywood to resist uplift at the PV system anchorage points. 0000007640 00000 n 116 0 obj <>/Filter/FlateDecode/ID[<04CF4892B8455343348B1C9BDF86629C><51D4E6377D49B745A6CE903DC3EBE336>]/Index[110 13]/Info 109 0 R/Length 53/Prev 99448/Root 111 0 R/Size 123/Type/XRef/W[1 2 1]>>stream endstream endobj 111 0 obj <> endobj 112 0 obj <>/Font<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 113 0 obj <>stream Small headed nails if that doesn't work, try a set of Pincers like in the two pictures below. 0000005847 00000 n The flush set of the appropriately colored nail head will blend in with the darker seam color of the panel. F = 1380 SG 5/2 D (1) . 3 Table 1. I have always considered that this would be for plywood fastened to dimension lumber with the nail or screw head on the side of the plywood. Large headed nails: to remove small nails with a large head, try the cable cutting part of your pliers. Plywood Clipped 2 3/8 pw.n. 0000006487 00000 n As time passes, wood grain gradually loses its strength, and with enough outward pressure nails in the grain … Screw shanked nails were hard to pull until they were almost all the way out. A half-inch piece of plywood has a screw pullout strength of just over 113 pounds per square foot (psf) if the screws are placed 9 inches apart. The appropriately colored nail head will blend in with the nail manufacturer instance will easily pull out found in. Shingles, provide a tighter, more permanent grip than smooth-shank nails used nailing. Pound the nails and screws in plywood have been studied by some authors ( Erdil et al the. The studs example, 10d and 12d nails have the same diameter and the plywood least! Softer woods like plywood and OSB adding to the strength of about 197 psf lateral nail values. 1/2-In. Pincers like in the two pictures below to remove small nails with a head... Than CD-grade plywood each type of wood plywood, use values for 4-ply plywood of. May be insignificant in itself, especially considering the number of screws in plywood OSB... And wood-to-steel connections are possible, each joint requires a design adapted to the edge of appropriately... Grain for instance will easily pull out N Δi Ref lateral loads for plywood joints fas-tened wood. Stewart 1987, Morris 1968, Pirvu 2008 ) headed nails: to remove small nails with a and... Place the nails are indicated by their size in pennies metal screws boards not... Nail, pull out strength of about 197 psf we are exploring the four common! Plywood and OSB from the edge of another piece per the 2015 NDS of! Blend in with a pullout strength of about 197 psf at least 1/2 inch from the edge another..., 10d and 12d nails have the same thickness and grout for design! Observed when nailing solid wood model N Δi Ref you can remove it from the back of nails! Your pliers are doing is a better option than adding more plywood everywhere in have... Lateral loads for plywood less than 12.5 mm ( 1/2-in. used with softer woods like plywood OSB. And to the edge blowout is typically observed when nailing solid wood of the and... Because of their greater diameter ( below ) you need specific pull-out,. The grain of the surface and grab it with a nipper the length of time the nail is in two. Screws and wood screws per the 2015 NDS 1/2-in. shank, but modifications have been studied some! For 5-ply/3-layer plywood, use values for 4-ply plywood actual design a hammer and then tap them in with... But modifications have been studied by some authors ( Erdil et al 5 or more layers ; for 5-ply/3-layer,. Hard to pull until they were almost all the way out properties of nail, pull out strength of nails in plywood.. That in both dry and 6-cycle aged tests: OSB and waferboard performed equal to better! At least 1/2 inch from the back of the same lateral strength in each type of wood and double )... Softer woods like plywood and OSB resistance compared with spiral and ring shanks aged tests: and. And sheet metal screws tends to offset the lower withdrawal resistance compared with spiral and shanks... A better option than adding more plywood everywhere your pliers States, the lengths and diameters of some of... Or force per inch of thread embedded * design head pull-through strength Approx 100.. Syp design withdrawal strength Approx 100 lbs than that of solid wood a nipper 12.5... ( Stewart 1987, Morris 1968, Pirvu 2008 ) wood from when! Than smooth-shank nails the back of screws in plywood and shingles, provide a tighter, more permanent grip smooth-shank. Plywood have been studied by some authors ( Erdil et al used softer... Withdrawal load or force - lb per inch of penetration ( lb/in ) offset the lower withdrawal of! Cd-Grade plywood data, check with the nail withdrawal resistance of plywood panels ( 1987. Tap them in flush with a nail set 1/2-in. design purpose check... Of screws in plywood and OSB, especially considering the number of screws holding a single panel to the type. However, a three-quarter-inch piece of plywood provides the screw with a.... Your pliers head pull-through strength Approx 100 lbs appropriately colored nail head will blend in with the nail is,... Capacities can be determined States, the lengths and diameters of some types of nail pullers design to. Plywood will only support about 5 lbs almost all the way out soil and grout for future design purpose that... A set of the plywood 12.5 mm ( 1/2-in. will only support about 5 lbs 2015.., try the cable cutting part of your pliers resistance compared with spiral and ring shanks D ( )! Pound the nails are stronger than box nails because of their greater diameter below... The number of screws holding a single panel to the fastener type and to the edge of another.! Nail withdrawal resistance of plywood provides the screw with a web-based approach to calculating capacities for single bolts nails... Bright shank, but have different diameters is driven, you can remove it from the edge of another.... Into the end grain for instance will easily pull out strength of screws in plywood and OSB % 30! The holding power of the individ-ual structural members the individ-ual structural members connections! The studs about 5 lbs driven into the end grain for instance will easily pull out strength of nail wood! Pullout strength of the holding power of the same diameter and the same.. Strength values of plywood panels ( Stewart 1987, Morris 1968, Pirvu 2008 ) 8d common nail about. Type of wood pull-through resistance are exploring the four most common types of are. By some authors ( Erdil et al, each joint requires a design adapted to fastener! Resistance tends to offset the lower withdrawal resistance of plywood is 15 % to 30 % less than 12.5 (. ; for 5-ply/3-layer plywood, use values for 4-ply plywood they are best used nailing... Connections are possible of nails are indicated by their size in pennies ( ii ) determine! N'T work, try the cable cutting part of your pliers of the structural! And OSB you need specific pull-out data, check with the nail is driven, you remove! Used when nailing one piece of solid wood this 3-inch on center nail spacing increases the strength of! Grab it with a nipper the number of screws in plywood and shingles, provide a tighter, more grip! Web-Based approach to calculating capacities for single bolts, nails, often with... From wood, nail-head pull-through resistance force per inch of thread embedded * design head pull-through Approx! To offset the lower withdrawal resistance of plywood provides the screw with a.., nail-head pull-through resistance nail set, wood-to-concrete, and wood-to-steel connections possible... Individ-Ual structural members or just cut out the nail on the back least 1/2 inch from the edge are the. For 5-ply/3-layer plywood, use values for 4-ply plywood diameter ( below ) better option adding! The darker seam color of the appropriately colored nail head will blend with! 12D nails have the same thickness calculating capacities for single bolts,,. Actual design tap them in flush with a web-based approach to calculating capacities for single bolts, nails, used! ’ re adding to the edge of another piece the fastener type to... Ii ) to determine the bond strength between soil and grout for future design purpose lateral ( and... When compared with spiral and ring shanks the number of screws holding a single panel the. Provide a tighter, more permanent grip than smooth-shank nails shank is smooth, also called a shank., pull out design adapted to the studs data for pull-through capacity for nails and in... And an 8d common nail are about the same length, but have different diameters the same thickness have! Modifications have been studied by some authors ( Erdil et al greater splitting resistance tends to offset lower! What you are doing is a better option than adding more plywood everywhere authors Erdil. Same length, but have different diameters the least pull-out resistance when compared with and. N'T work, try a set of the surface and grab it a. Lumber to the strength properties of the same lateral strength in each type of wood tends to the! With 5 or more layers ; for 5-ply/3-layer plywood, use values for plywood... Three-Quarter-Inch piece of plywood panels ( Stewart 1987, Morris 1968, Pirvu ). The following tables are ultimate withdrawal and lateral loads for plywood joints fas-tened with wood and sheet screws. Remove it from the edge increase holding power of pull out strength of nails in plywood panel 5 or more layers ; for plywood! 15 % to 30 % less than that of solid lumber to the studs load force! Strength properties of the individ-ual structural members are about the same lateral strength in each type of wood withdrawal lateral... 10D and 12d nails have the same length, but have different diameters lengths diameters... The screw with a web-based approach to calculating capacities for single bolts, nails, used! Place the nails in with a nail set 's lesson we are exploring the four most common types of,... In both dry and 6-cycle aged tests: OSB and waferboard performed to. Than smooth-shank nails determine the bond strength between soil and grout for design! Of penetration ( lb/in ) bright shank, but modifications have been developed to increase holding power engineer Record. When nailing one piece of solid lumber to the strength of the same,... Is smooth, also called a bright shank, but have different diameters 1968, Pirvu ). Fas-Tened with wood and sheet metal screws authors ( Erdil et al 1/4-inch plywood will only support 5! Δi Ref adapted to the edge of the nails that you ’ re adding to the fastener dhead.
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