Jamb Anchoring Requirements

Jamb anchors are the screws and bolts that hold your window or door frame to the wall. Get the spacing wrong, and the whole thing can rip out during a hurricane. See how anchor spacing changes with wind zone.

6" HVHZ Spacing
#10 Min Screw Size
3" Min Length
Anchor Spacing Visualization
6" O.C.
6"
HVHZ
8"
High Wind
12"
Standard
12
Total Anchors
#10 x 3"
Fastener
450 lbs
Pullout Each

Fastener Types

The right anchor depends on what you are fastening to. Wood framing and concrete need different fasteners.

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Wood Screws

For wood stud framing
  • Minimum #10 diameter (0.190" shank)
  • 3 inches long minimum
  • 1.5 inch penetration into solid wood
  • Stainless steel within 3000 ft of coast
  • No drywall screws - too brittle
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Concrete Screws

For CMU or poured concrete
  • 1/4 inch diameter Tapcon or equal
  • 1.75 inch embedment minimum
  • Pre-drill with correct bit size
  • Blue coating for corrosion resistance
  • Expansion anchors for heavy loads

Frequently Asked Questions

Common questions about jamb anchoring in hurricane zones.

How close together should jamb anchors be in hurricane zones?
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In Palm Beach County HVHZ, jamb anchors typically must be spaced no more than 12 inches apart. For high-pressure zones or large openings, spacing drops to 8 inches or even 6 inches. Anchors also must be within 6 inches of each corner of the frame.
What type of fasteners work for jamb anchoring?
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For wood framing, use #10 or larger screws at least 3 inches long penetrating minimum 1.5 inches into solid wood. For concrete or masonry, use 1/4 inch diameter concrete screws (Tapcons) or expansion anchors. Stainless steel is required within 3000 feet of saltwater.
Do impact windows need more jamb anchors than regular windows?
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Yes, impact windows are heavier and must resist debris impact loads in addition to wind pressure. Manufacturers typically require closer anchor spacing - often 6 to 8 inches - compared to 12 inches for standard windows. Always follow the specific product NOA or FL approval.
Why do jamb anchors fail during hurricanes?
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Most jamb failures happen because anchors were too far apart, too short, or missed the solid framing. Wind pressure cycles thousands of times during a hurricane, loosening weak connections. Using the wrong anchor type for the substrate (wood vs concrete) is another common cause.

Calculate Your Anchoring Requirements

Get precise jamb anchor specifications for any opening. PE-stamped calculations available.

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