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Wood frame toe nailing: how to toe-nail joists, studs, & beams in wood framed structures. This article describes the proper method for strong "double-shear" angled or toe nailing of joists or studs that butt into beams or top or shoe plates in wood framed buildings. Properly done, toe-nailing makes very strong wood framing connections. But mistakes like choosing the wrong nail size, wrong nail placement, or wrong number of nails can mean weak joints and a weak structure.
Wood framing connections & connectors: this article series explains the proper selection and installation of structural connectors, brackets & tie plates used to connect deck or porch framing and support members.
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Definition of toe-nailing: framing nails driven on an angle from opposing sides and through the nailed-through wood framing member into the nailed-to framing member so that the "crossed" opposed toe-nails form both a shear-resistant and a withdrawal-resistant connection between the framing members.
[Click to enlarge any image]
Toe-nailing or slant-driven nails are commonly used where it is not possible to drive through the side plate or top plate into the framing member, and has been historically widely used for connecting studs to the top or bottom plate, beam to plate, and rafter to plate or ridge board connections.
We will 5illustrate several of these toenail or slant-nail connections in this article.
Toe-nailing is used both stand-alone, without steel framing connectors and also toe-nailing is specified for the installation of some (not all) framing connectors.
Definition of shear loading & lateral loading of wood framing connections:
Shear loads or lateral load are across the framing nails while withdrawal loads are those that tend to pull the framing nails out of the nailed-to member.
Toe-Nails Instead of Joist Hangers are OK for Framing Lumber Butt-Joint Connections, but Don't Over-Nail and Don't Under-Nail
It is not necessary to use steel joist hangers (FRAMING CONNECTORS & JOIST HANGERS) if the joist is properly toe-nailed from either side into the ledger board, provided that the proper size and number of nails are used.
Our illustration (above left, adapted from a Double-Shear stamping on a steel joist hanger) explains why toe-nailed lumber connections can be very strong. We drew in spray-brown color, a representation of wood framing members showing the abutting of 2x lumber (vertical in the illustration) with a header or beam (horizontal in the illustration).
The crossed nails, when applied close together (as guided by the framing connector or by the hand of a competent framing carpenter), form a very strong wood-to-wood connection. Use of toe-nailing, or angled opposed framing nails (Double-Shear in Simpson Strong-Tie's patented joist hanger such as the item adapted above), can permit the use of fewer total nails in a wood frame construction.
Our photo at left shows an unsuccessful use of toenailing in a failed attempt to connect intersecting glulam beams. The nails (those brown spots) pulled, broke, bent, and allowed the connection to fail.
The steel Lally columns are also not properly located an installed.
These beams are not properly connected and their structure is in danger of collapse. That some movement has already occurred is evident in the gap above my tape measure.
The strength of a toe-nailed wood framing connection will be affected by:
How Many Nails to Use When Toe-Nailing
Because the "toe-nails" cross one another in the header or ledger board when used to secure a deck joist, this connection can actually be stronger than straight-in or end-nailing the deck joists from the other side of the ledger or girder. But using too many nails (below left) or too few nails (below right) is a mistake that results in a weak connection and potentially an unsafe structure.
Using Too Many Nails when Nailing Wood Framing
Using too many nails in a framing lumber connection when toe-nailing or in any position for that matter will also cause a weak framing connection that can lead to structural collapse.
That's because an excessive number of nails actually fractures the lumber. If you click-on and enlarge our photo at above left you'll see that the contractor fractured the vertical stud near its top. Our photo (left) shows about 30 nails shot by the builder during framing of this home.
The framer was trying to drive a recalcitrant stud into position. Clamps might have worked better. This stud was so split as to lose its structural integrity, and replacement of this wall stud was needed.
Too few nails when toenailing framing
Using too few toe-nails in a framing lumber connection is going to make a weak structure that could collapse. For code compliant nailing see the nail schedules in the applicable building code for your area. For example see the UBC Table 25-Q Nailing Schedule. A few examples are cited below.
How to keep the framing member in position when toe-nailing
Framing tip: if you've marked the stud, rafter, or joist location on the nailed-to plate or ridge board you may find that as you toe-nail the first nail into the side the nailed-through member begins to slide past the placement line.
If the movement of the nailed-through member off of the layout line is 1/8" or less, go ahead and finish the first nail, but then start the second nail on the opposite side of the nailed-through member. As you finish that nail you will drive the nailed-through member back to its exact position on the layout line.
If the movement off of the layout line is more than 1/8", stop nailing the first toe-nail and start the second opposite-side toenail to move the member back into position. Rather than tippy-tap back and forth on the two sides, you should be able to fully drive the second nail even if it moves the member back over the layout line up to 1/8" in the opposite direction. When you finish nailing the first toenail you'll drive the member back into perfect position.
Then finish the remaining toenails, taking turns to nail from opposing sides.
Where to Place the Nails When Toe-Nailing
At left is an example of angle or slant nailing that is not "toe nailing" because the nails for each connection are being driven into only one side of the mated wood members. That's ok for this application.
Incidentally, you may notice that the joist bridging shown at left was nailed at its upper end before the subfloor was set in place. But no one remembered to finish the job. The nails in the bridging ends show proper placement and angle for nailing into the joist bottom edges.
First let's understand the objective: we want the toe-nailed nails to accomplish the following:
If you're not sure about the angle (about 50° to 60° up from horizontal) or starting location of your nail from the end of the member, hold your toenail across an example of the to-be-connected lumber where the end of the nailed-to member is visible. You'll be able to see the depth to which it's going to penetrate.
What size nails should be used for toe-nailing
But in my OPINION the typical "toenailing" of this girder to the post top that some builders may use would still be an inadequate connection. This connection, discussed in detail at FRAMING CONNECTORS & JOIST HANGERS, is an unsafe structure that risks collapse.
Reader question: (July 22, 2012) Ron said: 3" or 3 1/4" for toe nailing 2x lumber?
In the article above you can see an illustration of toe-nailing showing nails crossing into the nailed-to member for strength.
Driven a properly-sized nail on a proper angle through the 1 1/2" of thickness of 2x lumber you've got 1- 3/4" bite into the lumber below; Toe nailing can be quite strong if properly installed - with nails in pairs set on opposing sides and at opposing angles so that they "cross" inside the nailed-to wood. But if "toe nailing" is done only from one side the framing connection is not strong and in my opinion not proper.
It's also important to locate the toenail correctly - if it's too close to the bottom of the vertical stud or end of the horizontal framing joist it will split the wood and won't have enough bite in the nailed-through member.
If on the other hand the toenail is too high in the nailed-through member it won't have enough bite in the nailed-to member. I toenail about an inch from the end of the nailed-through member and on an angle that I can visualize as sending a good portion of the nail into the body of the nailed-into member.
How to avoid splitting when toenailing or slant-nailing wood framing
In our photo at left I point out the location of two of the four required toenails for nailing the rafter to the top plate at the birds' mouth cut. I don't see any splitting but I'm worried that the nails may be a bit high. Depending on the size of nail used there may not be adequate penetration into the top plate.
Photo courtesy of Carson Dunlop Associates, a Toronto engineering & home inspection firm and home inspection education company.
Framing tip: experienced carpenters learn to place the long axis of the diamond-shaped cut tip of a common framing nail across the wood grain of the nailed-into member.
This position minimizes splitting. As you take the nail out of your nail apron with your left hand, just place the tip of your third finger on the nail tip and use your thumb and forefinger to roll the nail so that you feel its long axis against the flat of your third finger. With the nail in that position, as you start the fastener, place the long axis of the nail point across the wood grain.
A 3 1/2 inch common nail or 16d might be over-sized for toe-nailing and is likely to split the 2x, especially if nailed near the edges of the lumber.
You originally asked this question in an article on framing connectors. Framing connectors, an alternative to toenailing, are nailed straight into the respective framing members using common, galvanized but short framing connector nails, not full length common nails.
Toe-nailing & Slant-Nailing References
This article series discuss best porch & deck construction practices, including choice of framing materials, decking or flooring choices & installation, how to select and use deck and porch structural and flooring fasteners, actual deck & porch framing construction details & connections, deck joist & beam span tables, how to build leak-proof rooftop decks, construction of covered & screened porches, deck & porch railing construction & materials, choices of finishes and stains for decks & porches, and past & current deck lumber preservative treatments with related health & environmental concerns.
Continue reading at FRAMING FASTENERS, NAILS, SCREWS
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