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Constantly improving on their innovative RainEscape drainage system, Trex offers Post Flashing for 4 inch x 4 inch wood posts to further prevent moisture penetration. The snug-fitting collar slides over a 4 inch x 4 inch post and is secured with a bead of RainEscape caulk (sold separately) as well as RainEscape butyl tape (sold separately). A post sleeve can fit over the wood post and the Post Flashing. If there isn't a post sleeve, you can trim the Post Flashing to the same height as your deck boards to completely conceal the Post Flashing.

Give us a call at 1-888-824-5316 and our team of project planners will help you estimate how much of everything you'll need.

The Trex RainEscape deck drainage system is designed for easy DIY installation, whether your joist spacing is 12-inch or 16-inch on-center.

Please note, this system can only be used for new projects; it cannot be installed on an existing deck.


DecksDirect # 6272

Trex RainEscape Post Flashing Installation Instructions (2.14 MB) 

Trex RainEscape Installation Sheet (2.23 MB) 

Trex RainEscape Installation Instructions (9.50 MB) 

Trex RainEscape Warranty (19 KB) 

Pack SizeEach
Compatible Post SizeNominal 4 in x 4 in
Overall Dimensions
(width x depth x height)
6-1/2 in x 6-1/2 in x 3-1/2 in
Inside Dimension3-1/2 in x 3-1/2 in
Material TypePVC
Included AccessoriesNone
WarrantyView Trex RainEscape Warranty Information
Butyl Tape for Trex RainEscape
Starting at: $63.67
Butyl Caulk for Trex RainEscape
Starting at: $10.90
Recessed Low Voltage LED Straight Dot Light by Trex
Starting at: $28.99
Recessed Low Voltage LED Riser Light by Trex
Starting at: $32.99
Downspout for Trex RainEscape - Tan
Starting at: $42.41
Grace Vycor Plus Self-Adhering Flashing Tape
Starting at: $28.99
Recessed Low Voltage LED Straight Dot Light by Trex
Starting at: $28.99
Acrylic Adhesive Flashing Tape by G-Tape
Starting at: $22.99
Trex Protect Non-Skid Butyl Tape is available in a 1-5/8 inch width for joists or in a wider 3-1/8 size for beams.
Starting at: $24.49
Soffit Light for Trex RainEscape
Starting at: $69.10

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