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12 in. Galvanized Weather Cap

  • Fits most 12 in. turbine bases
  • Galvanized construction with easy installation
  • Used to replace turbine heads during anticipated severe weather
  • View More Details

Frequently Bought Together


Product Overview

More homes and businesses in the U.S. are protected by a GAF roof than by any other product. We are the leading roofing manufacturer in North America.

Nothing protects quite like a roof.

Nothing protects quite like a roof. That's why millions of Americans live, work, and play under quality products from North America's largest roofing manufacturer - GAF.

Always have a balanced ventilation system. The amount of exhaust ventilation should always be equal the amount of intake ventilation.

How much Ventilation do I need?

Include 1 sq. ft. of attic ventilation, evenly split between intake and exhaust, for every 300 sq. ft. of attic floor space.

Choosing the right attic ventilation for your home is very important. GAF offers a great selection of Master Flow and Cobra products.

What type of Ventilation do I need?

Review the ventilation options below to determine the best fit for your home application.

Available in both roof mount and gable mount, power attic vents exhaust the greatest volume of hot and/or humid air from the attic.

High efficiency Electric, Solar or Hybrid

Quickly removes large volumes of heat and moisture from your attic.

Cooler external air enters through vents lower on the eaves or soffits that “pushes” the hot/moist attic air out of the vents higher on the roof.

No electricity required

Allows excess heat and moisture to escape your attic without the need for electric hook-up.

Wind Turbines utilize the wind to pull heat and moisture from your attic and acts as a static exhaust vent when wind is still.

Wind-powered, smooth, and quiet operation

Utilizes the wind to pull heat and moisture from attic; acts as a static exhaust vent when wind is still.

Located at the lowest part of the roof, intake vents are a critical part of the attic ventilation system, allowing fresh air to flow into the attic

The most overlooked and critical part of attic ventilation

Allows cooler, fresh air to enter the attic at/near the soffits driving heat and moisture out higher exhaust vents.

Your home offers warning signs when your attic isn’t properly ventilated. You may recognize some of these signs in your own home.

5 Warning Signs

Here are some poor attic ventilation warning signs that you may recognize:

A possible cause of higher cooling costs could be insufficient attic ventilation, requiring the cooling system to run excessively.

1. Increased energy costs

Excess attic heat can cause your cooling system to work harder, raising your energy costs.

If you see that your shingles are dry or breaking, that could mean you have inadequate attic ventilation or you may need a new roof

2. Curling/cracking shingles

Inadequate ventilation can cause your roof shingles to curl and crack.

Moisture in the attic can become trapped and condense on rafters and insulation if not insulated properly. This can potentially increase energy costs

3. Roof decking moisture

Excess attic moisture can drip into attic insulation reducing effectiveness, even damaging ceilings below.

Stains or mold growth inside your home may be caused by inadequate attic ventilation. Excessive moisture in the attic allows mold and mildew to thrive

4. Attic mold/mildew

Excessive moisture can cause dangerous mold and mildew causing additional concerns.

Ice damming can cause water to enter the attic and house if you don’t have an adequate shingle underlayment or if the flashing has deteriorated.

5. Winter ice dams

Ice dams can cause expensive leaks and damage in attics, as well as living spaces.

The GAF Master Flow weather caps are used to replace turbine heads when severe weather is anticipated. It fits all GAF Master Flow 12 in. turbine bases. Manufactured from galvanized steel for durability. The WC12 weather cap fits most other brands of turbine bases.
  • 12 in. cap is used to replace turbine head when severe weather is anticipated
  • Galvanized steel construction for durability
  • Slots on sides to secure to turbine base
  • Fits any 12 in. Dia turbine base
  • Florida building code approved
  • Easy to install
  • Base not included

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Paintable,UV Resistant,Wildlife Guard
Galvanized Steel
Pack Size
Product Weight (lb.)

Warranty / Certifications

Manufacturer Warranty
1-year Accessory Warranty

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.3
    out of 32 reviews
  • 100% recommend this product
Filter by:
Showing 1-10 of 32 reviews
Good quality but too early for rating...
Good quality but too early for rating
by HomeDepotCustomer
  • Verified Purchase
Too small
They are too small. After spending a few hours getting them on, and a few getting them off, I broke down and got a pair custom-made at a sheet metal shop. Expensive, but on and off in a few minutes.
by Pianodude
    • Recommended Product
    Perfect for what I needed...to remove the turbine in a...
    Perfect for what I needed...to remove the turbine in a storm threat
    by Nick
    • Verified Purchase
    Rating provided by a verified purchaser...
    Rating provided by a verified purchaser
    by HomeDepotCustomer
    • Verified Purchase
    Good quality, easy to install, the price was very reasonable. You...
    Good quality, easy to install, the price was very reasonable. You will have to line up the holes to the galvanized weather caps to the vent base, as they do not line up exactly with the holes to the vent. I recommend bringing a drill and a small drill bit for aluminum. You may need a very small block of wood for resistance as you drill the holes. Another option is self tapping hex srews.
    by Depotman65
    • Verified Purchase
    Did not come with screws to mount...
    Did not come with screws to mount
    by DAVID
    • Verified Purchase
    Excellent Product
    Excellent Product
    by HomeDepotCustomer
    • Verified Purchase
    • Recommended Product
    It was good for the price. We will see in next...
    It was good for the price. We will see in next hurricane
    by HomeDepotCustomer
    • Verified Purchase
    These are super easy to install. Worked well for...
    These are super easy to install. Worked well for us to permanently eliminate some old Wind Turbines.
    by tcr
    • Verified Purchase
    1 person found this helpful
    Needs to be a bit larger to fit properly. Had...
    Needs to be a bit larger to fit properly. Had to trim boot for the cap to slide on. It works but takes a little effort to get on.
    by HomeDepotCustomer
    • Verified Purchase
    Showing 1-10 of 32 reviews