How to Fix a Sagging Awning Fabric

Awning fabric sags for a handful of reasons: the pitch angle has dropped over time, the spring tension inside the roller has weakened, or a support arm has bent or corroded. It’s a common issue, especially after a rough winter, and most causes are fixable without calling anyone out.

What You’ll Need

Tools

• Step ladder (tall enough to reach the roller tube safely)
• Adjustable spanner or socket set
• Flathead and Phillips screwdrivers
• Measuring tape
• Marker pen or tape

Materials / Replacement Parts

• Replacement tension spring (if the roller mechanism is worn)
• Replacement arm cord or bungee (if applicable to your awning type)
• Silicone lubricant spray
• Replacement arm strut or elbow joint (if arms are bent or cracked)

---

How to Fix It: Step-by-Step

Step 1: Diagnose Where the Sag Is Coming From

Before you touch a single bolt, spend two minutes figuring out what’s actually wrong. A sag caused by loose tension needs a different fix to a sag caused by a bent arm.

• Extend the awning fully and stand back to look at the shape of the fabric
• Check whether both arms are sitting at the same angle, or if one side is lower than the other
• Look along the roller tube for any obvious warping or one-sided droop
• Push gently up on the fabric midpoint — if it springs back with some resistance, the arms are probably fine and the pitch is the problem; if it stays put or wobbles, the arms need attention

Step 2: Adjust the Pitch Angle

If the fabric sag runs across the whole width rather than one side, the pitch is almost certainly too flat. Most awnings have pitch adjustment bolts on the wall brackets, and raising the angle is usually enough to pull the fabric tight.

• Retract the awning before adjusting anything
• Locate the pitch adjustment bolt on each wall bracket (usually a large bolt on the side of the bracket housing)
• Loosen both bolts by the same number of turns, then tilt the bracket slightly downward to increase the pitch
• A pitch of around 14-17 degrees is typical for most residential awnings
• Retighten both bolts to the same position, then extend the awning to check the result
• Repeat in small increments if needed — overpitching puts stress on the arms

Step 3: Restore the Roller Tension

If adjusting the pitch doesn’t fix it, or the fabric hangs loose at the front when the awning is extended, the roller spring tension has probably weakened. This is what keeps the fabric taut from the inside out.

• Retract the awning fully before working on the roller
• Some awnings have a tension adjustment nut on the end cap of the roller tube — check your awning manual for its location
• Turn the nut in the winding direction (usually clockwise, but check the model) by one or two full turns
• Extend the awning and test the tension — the fabric should sit firm, not ripple or droop
• If the spring is broken rather than just slack, the roller cassette or tension spring will need replacing.

Step 4: Inspect and Straighten the Arms

If one side sags more than the other, check the arms on that side. Aluminium arms can bend slightly under load or after a storm, and plastic elbow joints crack.

• Extend the awning fully to see the arms under tension
• Look at each arm’s elbow joint and telescoping sections for cracks, bends, or corrosion
• Check the arm cord or bungee (runs inside the arm on many models) — a snapped cord leaves an arm floppy
• Minor bends in aluminium arms can sometimes be straightened by hand with firm, even pressure, but cracked joints or snapped cords need replacement parts
• Apply silicone spray to all arm pivot points while you’re there — stiff pivots are often the first sign of bigger arm problems