How to Install Your Sling
Step-by-step instructions for replacing the sling on your patio furniture.
Estimated time: 30-60 minutes per chair · Last updated May 2026
How It Works
Your new sling has a sewn tunnel along each edge. You insert a spline rod through each tunnel, then slide the fabric into the rail channels on your chair frame. The spline rod is what locks the fabric inside the rail. After sliding the sling in, you bolt everything back together and stretch it tight.
Tunnels Pre-Sewn
We sew the spline tunnels. Your sling arrives ready to install.
Spline Rods Included
The correct spline/retaining rods come with every order.
Take Photos First
Photograph your frame before disassembly for reference.
Tools You'll Need
Flat-head screwdriver
End caps, loosening old sling
Scissors or utility knife
Cutting old sling
Ratchet & sockets
Rail bolts
Pliers
Pulling old sling, stretching new sling
Rubber mallet
End caps
Wire cutters
Trimming spline rods
Clamps (optional)
Holding fabric while tightening
Masking tape
Marking rails
Penetrating oil (optional)
Loosening corroded bolts
Step-by-Step Installation
Remove the End Caps
Using a flat-head screwdriver, carefully pry the plastic end caps off both ends of the sling rails. End caps can become dry and brittle from sun exposure — try pulling them off by hand first. If they resist, gently pry with the screwdriver.
Tip: Set end caps aside safely — you'll reinstall them at the end.
Remove the Old Sling
The easiest way is to cut the old sling down the middle with scissors or a utility knife, then slide the old fabric out of the rails. If it's stuck, try pushing it back into the rail with your hands, or use pliers to pull it out. Dish soap and water sprayed into the rail can help loosen stubborn slings.
Tip: If you want to keep the old sling as a reference, unbolt the rail instead of cutting.
Remove One Rail & Spreader Bar(s)
Unbolt one sling rail from the frame (keep the other attached). Use a ratchet with the correct socket size. Remove the spreader bar(s) from the back of the frame. Before disassembling, mark the rails and frame with masking tape so you know which side is which.
Tip: Spray bolts with penetrating oil 30-60 minutes before to loosen corrosion. Replace any rusted or bent bolts.
Insert Spline Rods Into the New Sling
Your new sling has a sewn tunnel (pocket) along each edge. Insert the included spline rod into the opening on each side, feeding it all the way through. The rods will be longer than the fabric — DO NOT trim them yet. The excess length helps the sling slide through the rails.
Tip: Leave spline rods long until the very last step. The excess makes installation much easier.
Slide the Sling Into the Rails
Starting with the excess spline rod, feed the sling fabric through the rails. The rod slides into the channel inside the rail and pulls the fabric along with it. Make sure the rails are on the correct sides and in the same position as before.
Tip: If your sling has a tag, make sure it will end up on the top or back of the frame.
Bolt the Rails Back On
Line up the bolt holes and hand-tighten all bolts with your fingers first. Don't fully tighten yet — you need play to adjust the sling. If you had spacers or washers, put them back in.
Adjust the Sling Length
Starting at the bottom/front of the frame, pull the sling material until it's flush with the ends of the rails on both sides. Once aligned, tighten the bottom/front bolts with a ratchet to lock the front in place for stretching.
Tip: The sling may look slightly short before stretching — this is normal. Slings are designed to fit tightly.
Stretch the Sling & Eliminate Wrinkles
On the side that hasn't been tightened, use pliers to grip the fabric and stretch it to the edge of the rail. Clamp it to hold position, then tighten the remaining bolts. The sling should now be tight and mostly wrinkle-free. Minor wrinkles will work out after use.
Tip: Place your new sling in the sun for 10 minutes before installation — warm fabric is much easier to stretch.
Reinstall Spreader Bar(s)
If your frame has spreader bars, they need to go back on. Flip the frame over onto a towel. Try fitting the bar into position — if it's slightly long, bend it gently over your knee. If it won't bend, use a spreader tool (~$10) to push the rails apart. A second person helps here.
Tip: Not all frames have spreader bars — skip this step if yours doesn't.
Trim Spline Rods & Reinstall End Caps
Using wire cutters or heavy scissors, trim excess spline rod flush with the end of each rail. Tap the end caps back in using a rubber mallet — gently, so you don't crack them. Give the chair a test sit!
Tip: If end caps won't go in, check that the spline rod isn't sticking out.
Good to Know
Sling Appears Short?
Normal. Slings are designed to fit tightly and require stretching during installation.
Warm Day Advantage
Place sling in the sun for 10 minutes before installing. Warm fabric is much easier to stretch.
Minor Wrinkles
Some wrinkles may remain after installation, especially around bending areas. They work out after a few uses.
Two-Piece Slings
Install the seat piece first, then the back piece for correct tension on each.
Grab a Helper
Most of the job is doable solo, but spreader bar installation and stretching are easier with two people.
Frames Vary
Every manufacturer is a little different. Use these as a general guide and adapt for your specific frame.
Disclaimer: These are general installation instructions. Sling frame assemblies vary by manufacturer and model. Casual Slings is not liable for any damages caused to frames or materials as a result of following this guide.
Need New Slings?
Custom-cut with tunnels sewn and spline rods included. Ready to install.