How to Install FRP Column Covers: Step-by-Step Manufacturer Guide (2026)
Direct Answer (Quick Summary):
To install FRP (Fiberglass Reinforced Polymer) column covers, measure and cut the two fiberglass halves to height, dry-fit them around an existing structural support, bond the seams with a two-part epoxy adhesive, and secure them with stainless steel screws. Finish the vertical seams with fiberglass tape and automotive-grade bondo, then install the capital and base before final caulking, priming, and painting for a seamless, weather-resistant finish.
FRP column covers are a durable, low-maintenance way to upgrade the look of porch columns without altering the existing structural support. Unlike wood, fiberglass will not rot, absorb moisture, or attract insects — making it an ideal long-term solution for exterior applications.
This guide walks through the manufacturer-recommended installation process for Architectural Mall FRP column covers, based on our official installation manual and real-world field experience.
Important: FRP column covers are decorative, non-structural wraps. They must be installed over an existing load-bearing column or post. They do not replace or reinforce structural supports.
Video: FRP Column Cover Installation (Recommended)
Before starting, we strongly recommend watching our installation video to familiarize yourself with the process:
Tools & Safety Equipment Required
Have all tools and protective equipment ready before beginning installation.
Tools & Materials:
Tape measure
Level
Pencil & speed square
Screw gun / drill
Circular saw or angle grinder (with masonry or diamond blade)
Two-part epoxy adhesive
Stainless steel screws
Caulk gun & exterior caulk
Automotive-grade bondo & fiberglass tape
Wood or plastic wedges
Painter’s tape or ratchet straps (optional, but helpful)
Safety Equipment:
Protective eyewear
Gloves
Dust mask or respirator (recommended when cutting fiberglass)
Step-by-Step FRP Column Cover Installation
Step 1: Measure & Cut the Column Cover
Measure the total height from the installation surface to the underside of the beam or ceiling. Cut the column halves to length using a circular saw or grinder.
Column covers may be cut up to ½ inch shorter for easier installation.
Some capitals add height, while others wrap around the shaft — account for this before cutting.
Always wear protective gear when cutting fiberglass.
Step 2: Temporarily Assemble & Pre-Drill
Join the two column halves together temporarily using painter’s tape or straps.
Pilot-drill holes every 12–16 inches on center
Do not countersink too deeply — fiberglass can crack if penetrated
If a hole is drilled too deep, move 2 inches away and re-drill
Step 3: Position Around Structural Support
Move the assembled column to its installation location.
Place the halves around the existing structural post
Use plastic wedges for exterior installations (wood wedges for interior)
Shim the column slightly to prepare for leveling
Step 4: Bond & Secure the Column Halves
Apply a liberal amount of two-part epoxy adhesive to the inside of the lap flange.
Join the halves together using stainless steel screws
Do not overtighten until the adhesive cures (typically up to 24 hours)
Ensure edges are flush and aligned before final tightening
Step 5: Install the Capital
Attach the capital to the column shaft.
Being ½ inch shorter makes this step easier
Use the same adhesive and screw method as the shaft
Align halves carefully for a seamless appearance
Step 6: Level & Set the Column
Use wood or plastic wedges to level the column perfectly.
Once plumb, apply adhesive around the wedges to lock them in place
Recheck level before the adhesive fully cures
Step 7: Finish the Vertical Seams
Reinforce seams using fiberglass tape and automotive-grade bondo.
Apply bondo in thin layers
Sand between coats for a smooth, professional finish
Avoid heavy applications — patience produces the best result
Expert Tip: Seam finishing should be treated like auto-body repair. Thin layers and sanding are key to making a two-piece wrap look like a solid architectural column.
Step 8: Build & Install the Base
Construct a frame at the bottom of the column and install the base.
Follow the same glue-and-screw process
Ensure the base is square and flush before curing
Step 9: Caulk, Prime & Paint
Caulk all joints:
Base to column shaft
Column shaft to astragal (if applicable)
Capital to substrate
Prime and paint using high-quality exterior products. FRP accepts paint well and holds finishes far longer than wood.
Step 10: Post-Installation Check (Recommended)
After 24–48 hours:
Inspect seams and caulk lines
Touch up if needed
Monitor during the first few weeks for movement or gaps
Common Installation Mistakes to Avoid
Skipping pilot holes → cracked fiberglass
Using non-stainless screws → rust stains
Overtightening screws before epoxy cures → seam separation
Applying bondo too thick → difficult sanding
Installing over unsound structural posts → future failure
Frequently Asked Questions
How long do FRP column covers last?
With proper installation and painting, FRP column covers can last 30–50+ years with minimal maintenance.
Can FRP column covers be painted any color?
Yes. Use a high-quality exterior primer and paint. Urethane-based paints provide excellent adhesion and durability.
Can I install FRP covers over rotted columns?
No. The underlying structural post must be sound. Column covers do not stop or repair existing structural rot.
How long does installation take?
For experienced installers, most projects take 2–4 hours per column, excluding curing time.
Download the Printable Installation Guide
Prefer a printable version?
Related Resources & Internal Links
Need Help With Sizing or Product Selection?
Architectural Mall has been manufacturing and supplying high-performance architectural products for over 20 years. If you need help choosing the right FRP column covers, capitals, or bases.
Call 877-279-9993 or email us
