Hurricane Straps and Roof-to-Wall Connections — What Georgia Homes Need

What Hurricane Straps Do and Why They Matter in Georgia

A hurricane strap is a pre-formed metal connector — typically 18-gauge or 20-gauge galvanized steel — that ties a roof rafter or truss directly to the wall top plate below it. Without this connector, the only thing holding your roof to your walls is gravity and a few toenails driven at an angle through the rafter into the plate.

Toenails work fine under static gravity loads. They fail under uplift. When wind flows over a roof, it creates negative pressure on the leeward slope — suction that pulls the roof upward. During a severe thunderstorm or straight-line wind event, that uplift force can exceed 50 pounds per square foot on portions of the roof. At a truss spaced 24 inches on center with a 20-foot tributary span, a single connection point can experience over 1,000 pounds of uplift. Three toenails driven into end grain provide roughly 200 to 300 pounds of withdrawal resistance. The math does not work.

Hurricane straps solve this by wrapping around the rafter or truss and nailing into the side grain of both the rafter and the top plate — creating a mechanical connection that resists uplift through nail shear rather than withdrawal. A single Simpson Strong-Tie H2.5A strap, properly installed with the correct nails, provides 590 pounds of rated uplift capacity. That is two to three times the capacity of toenails — and the connection does not degrade over time the way nails driven into end grain can loosen as wood shrinks.

Georgia Wind Requirements Under ASCE 7-16

Metro Atlanta falls within the 115 mph ultimate design wind speed zone under ASCE 7-16, the standard Georgia references for wind loading. This is not the sustained wind speed during a storm — it is the 3-second gust speed used for structural design with a 700-year return period. The actual uplift forces at any connection depend on the wind speed, exposure category (how open the terrain is), roof slope, building height, and the location on the roof. Corner zones, ridge lines, and gable ends experience the highest uplift pressures — sometimes double or triple the pressures at the center of the roof.

Our structural engineer calculates these zone-specific uplift demands using the ASCE 7-16 components and cladding tables, then compares them against the rated capacity of the installed connectors. In many homes we inspect, the center-of-roof connections may be adequate but the corner and edge zones are grossly under-connected — because the builder used the same strap everywhere instead of upgrading connectors at high-demand locations.

Types of Roof-to-Wall Connectors

Not all hurricane straps are the same. Different connection geometries require different hardware, and selecting the wrong connector leaves the connection under-rated even when a strap is physically present.

H-Series Straps (H2.5A, H10, H10A)

The H-series from Simpson Strong-Tie is the most common hurricane strap in residential construction. The H2.5A wraps over the top of the truss or rafter and nails into both sides, providing a direct uplift path. It requires four 8d x 1.5-inch SD connector nails on the truss/rafter side and two on the plate side. The H10 and H10A models handle higher loads — up to 1,340 pounds of uplift — and are used at gable ends, hip corners, and other high-demand locations.

Twist Straps (LSTA, MSTA)

Twist straps install from one side of the connection, making them ideal for retrofit applications where you cannot access both sides of the rafter-to-plate joint. The LSTA series provides up to 1,280 pounds of rated uplift depending on the model and installation configuration. These are the straps our engineer specifies most often for retrofit work in existing Atlanta homes because they can be installed from inside the attic without removing sheathing or exterior cladding.

Embedded Holdowns and Anchor Bolts

For new construction, the continuous load path often starts with embedded anchor bolts or holdown brackets that connect the wall framing to the foundation. Hurricane straps are one link in this chain — they transfer uplift from the roof to the walls, and then holdowns and anchor bolts transfer it from the walls to the foundation. A strap without the lower connections is an incomplete load path.

Common Hurricane Strap Failures Our Engineer Finds

Having a strap physically present on a rafter does not mean the connection is adequate. Our structural engineer finds four categories of failure in metro Atlanta homes — and every one of them reduces the connection capacity below the code-required uplift resistance.

Failure 1: No Straps at All — Toenails Only

The most common finding in homes built before 2000: no metal connectors anywhere. Every rafter or truss is held to the wall plate by two or three toenails driven at an angle into end grain. These connections were standard practice for decades, but they cannot resist the uplift forces specified by current wind design standards. A toenailed connection in end grain has roughly one-third the withdrawal resistance of the same nail driven into side grain. Under cyclic wind loading (gusts that push and pull repeatedly), toenails loosen further with each cycle.

Failure 2: Wrong Fasteners

This is the failure that surprises homeowners most. The strap is there, it looks right, but the installer used the wrong nails. Drywall screws are the worst offender — they are hardened, brittle steel that snaps under shear loading instead of bending. Roofing nails with large flat heads do not fit the strap nail holes correctly and have shorter shanks. Common framing nails may work in some applications, but they are not tested or rated with the strap. The manufacturer’s rated capacity is based on specific nail types tested under laboratory conditions. Substitute any other fastener and the rated capacity is void.

Failure 3: Insufficient Nails

A Simpson H2.5A strap has ten nail holes — four on each side of the rafter and two into the top plate. Our engineer routinely finds straps with only two or three nails installed, leaving seven or eight holes empty. The rated capacity of the strap is proportional to the number of nails. A strap with 3 nails out of 10 holes filled delivers roughly 30 percent of rated capacity — which may be less than the toenailed connection it was supposed to replace.

Failure 4: Strap Bent, Buckled, or Misaligned

Hurricane straps must bear flat against the wood surface with the nails driven straight through the nail holes. Straps that are twisted during installation, bent to accommodate misaligned framing, or buckled because the rafter does not sit directly above the wall plate create eccentric loading that reduces capacity. A strap nailed at an angle or with a gap between the strap and the wood surface will peel away under uplift rather than transferring the force cleanly into the framing.

Adding Hurricane Straps to Existing Homes

Most homes in metro Atlanta built before the early 2000s have no hurricane straps. The good news: retrofit connectors can be installed from inside the attic without opening walls or removing roofing. The process is labor-intensive but straightforward for a crew that understands the hardware.

Our structural engineer begins by calculating the uplift demand at each connection point using the ASCE 7-16 wind loading provisions for the specific building. The demand varies by location on the roof — field, edge, and corner zones each have different pressure coefficients. Connections at gable ends and hip corners typically require higher-capacity connectors than mid-span trusses.

For standard interior truss connections, the Simpson LSTA or MSTA twist straps are the most practical retrofit option. These straps install from one side, which is critical when the opposite side of the rafter-to-plate connection is inaccessible due to wall sheathing. Each strap is nailed with Simpson SD connector nails — not common nails, not screws. Every nail hole gets filled.

In attics with blown-in insulation, the insulation must be pulled back from each connection point to expose the rafter-to-plate joint. Our crew marks each truss location, clears the insulation, installs the connector with the specified fastener schedule, and replaces the insulation. The entire attic can typically be strapped in one to two days depending on access and truss count.

The retrofit strap installation is one link in the continuous load path from roof to foundation. If the wall-to-foundation connection is also inadequate — missing anchor bolts or holdown brackets — the uplift force transfers through the new straps into the walls but has nowhere to go from there. Our engineer evaluates the entire load path, not just the roof-to-wall connection, and recommends the complete scope of work needed to create a continuous uplift resistance chain.

For related structural concerns, see our pages on truss damage, rafter and collar tie failures, and sagging roof repair. If your roof has been damaged by a storm and you are filing a claim, our insurance claims assistance team works alongside the structural engineer to document the damage for your adjuster.

Why Connection Inspections Require an Engineer

A general home inspector can note whether straps are present or absent. That is a binary observation. It does not tell you whether the straps installed are the correct model, whether they have the correct nails, whether the nails are in the correct holes, or whether the rated capacity meets the calculated uplift demand for that specific location on the roof.

1 Source Roofing is the only roofing contractor in metro Atlanta with a structural engineer on staff. When our engineer inspects your attic, he does not just look for straps — he calculates the actual wind uplift forces at each connection using ASCE 7-16, compares those forces against the installed connector capacity, and identifies every deficient connection. The result is a written engineering report that specifies exactly which connectors to install, where, with what fasteners, and in what quantity.

That report serves multiple purposes. It guides our installation crew so every connection meets the calculated demand. It documents the pre-existing condition for your insurance claim if storm damage is involved. And it provides a permanent record that the work was engineered — not guessed at by a roofer eyeballing the attic with a flashlight.

For a complete structural assessment that goes beyond hurricane straps, see our roof framing inspection page. To understand how wind uplift code requirements affect your specific roof geometry, or how improper roof penetrations can compromise structural integrity near strap locations, explore our full library of technical resources.