Deck Accessories
Post Caps
Deckorators
$3-$25/eachFlat Deck Post Caps for Clean Post Finishing
Flat deck post caps provide a clean finished appearance while protecting exposed post tops from water infiltration that causes splitting checking and rot. Available in wood composite metal and copper these simple caps are the most essential yet overlooked deck accessory extending post life significantly.
Key Features
- Protects post tops from water
- Clean finished appearance
- Multiple material options
- Fits standard 4x4 and 6x6 posts
- Easy press-fit installation
- Available in matching colors
Specifications
Materials: wood composite aluminum copper vinyl | Fits: 4x4 and 6x6 posts | Installation: friction fit or adhesive | Styles: flat pyramid New England | Colors: multiple to match railing
Best For
All exterior deck posts fence posts pergola posts and any exposed post top requiring protection from water and a finished appearance.
Compatible Materials
Pressure-treated posts
Cedar posts
Composite post sleeves
Vinyl post sleeves
4x4 and 6x6 posts
Pros & Cons
Pros
- ✓ Essential post protection
- ✓ Clean professional look
- ✓ Easy installation
- ✓ Very affordable
- ✓ Multiple style options
Cons
- ✗ Can blow off in high wind
- ✗ Adhesive may be needed
- ✗ Limited to standard post sizes
- ✗ Some materials fade
- ✗ Must size correctly
Installation Tips
Ensure post top is flat and level. Apply construction adhesive to the post top for permanent installation. Press cap firmly into place. For wood caps apply finish to match the deck before installation. Copper caps will develop a green patina over time which can be prevented with clear sealer.
Frequently Asked Questions
Highly recommended. Uncapped posts absorb water through the end grain leading to premature splitting and rot.
Standard caps fit nominal 4x4 (3.5x3.5 actual) and 6x6 (5.5x5.5 actual). Measure carefully.
Copper develops a green patina for rustic look. Aluminum stays uniform with powder-coated finish.