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25mm Aluminum Base & Cap – Mill Finish – 30 Base Screws & 30 Cap Screws Included w/24’ Piece


The 25mm aluminum base & cap is sold online in bundle packs, please choose ‘mill/wood’ for wood applications or ‘mill/metal’ for metal applications. Product purchase includes type and quantity of screws for correct installation.

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Product Description

Aluminum base and cap profiles are used to connect multiwall sheets together, providing a finished, professional look.

This aluminum base and cap install system is a dry seal, multiwall polycarbonate glazing system. An ideal system for installing polycarbonate sheets on structures with horizontal purlins set above rafters or trusses, arched roofs, or stud walls on metal and wood framed buildings.

Easy to install and versatile, this multiwall polycarbonate install system can be used with stud and rafter or purlin and girt framing. The aluminum base easily attaches to roof purlins or wall girts as well as to vertical rafters, trusses, or studs. (Proper blocking is required for load support.) Frames can be fabricated from wood, steel, or aluminum. The layout is the same for all frame types.

There are no gaskets required with this aluminum base and cap system. When the multiwall polycarbonate sheet is correctly fastened to the frame, the pressure of the aluminum cap against the sheet creates an exceptional seal, providing a watertight installation.

Easily cover a greenhouse, pool enclosure, large skylight, or metal building frame with this simple and straight forward base and cap multiwall polycarbonate install system.

Note: Multiwall polycarbonate sheets must be installed with the ribs ‘flutes’ following the roof slope and/or with the ribs vertical on the walls. This is important so the ribs properly drain condensation. If the sheets are installed horizontally, mold may gather in the flutes.

Formerly know as the Sundance Supply Base & Cap System.

Additional information

Weight11 lbs
Dimensions144 × 3.875 × 0.75 in


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Product Type

Aluminum Channels

Product Details

  • Base Profile: 6063 T5 Alloy Aluminumbase and cap trim system
  • Cap Profile: 6063 T5 Alloy Aluminum
  • Finish: Mill
  • Available Lengths: 4’, 6’, 8’, 12’ (Sold in Bundle Packs)
  • Fits Sheet: 25mm
  • Fasteners: Included w/purchase
  • Warranty: No

Sold Separately: Aluminum 8’ U-Profiles and 8’ 2″ x 2″ 90-Degree Corners
Base and cap profile is also available in 24-foot lengths. Framing and ridge flashing not included.



This Multiwall Polycarbonate Base & Cap System is ideal for a variety of applications including:

  • aluminum base and cap pool enclosurePool Enclosure
  • Pergola
  • Awning
  • Canopy
  • Breezeway
  • Carport
  • Skylight
  • Porte Cochere

Technical Information

A complete list of install components can be found by clicking on ‘All Products’ in the main menu and selecting ‘Install Accessories’. For additional product and technical information, please visit our ‘Resource Hub’.

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