What size nails should you use for a ridge vent?
Why ordinary shingle nails are too short
Standard shingle nails, often around 1 1/4 inches, are sized for a few layers of shingle on the deck. A ridge vent adds roughly an inch of vent body plus the folded cap shingle, so the same nail barely reaches the wood. The cap nails are what hold the vent down in high winds, so short nails are a common cause of ridge blow-offs after Georgia storms.
What to check in the instructions
- Minimum length or required penetration depth.
- Shank type, smooth or ring shank, and gauge.
- Head size, commonly 3/8 inch minimum.
- Corrosion resistance, such as hot dipped galvanized.
- Nail placement, usually on lines marked on the vent.
Do not overdrive
Driving nails too deep crushes the vent, reduces airflow and leaves a wavy ridge. Set the nail gun pressure carefully or hand nail the caps so the heads sit snug and flush with the cap shingle.
Checking an existing ridge
From the attic, look for nail tips coming through the deck along the ridge. If none show on a plywood deck, the nails may not be penetrating. Read wind damage to roofs in Georgia and roof ventilation basics.