How Do You Measure for an 84 Inch L Shaped Double Elbow Curtain Rod
2026-11-10
Measuring a corner window for a 84 Inch L Shaped Double Elbow Curtain Rod requires more precision than a standard straight rod, because the double elbow design must clear the corner while keeping both curtain panels aligned. At Sunway, we have helped thousands of homeowners and installers get this measurement right, and the process comes down to four steps: map the corner, measure each leg, confirm the elbow clearance, and verify the return and projection. This guide walks through each step with the same field method Sunway recommends to professional fitters.
Step 1: Map the Corner and Identify the Two Legs
An L-shaped rod has two straight legs joined by a double elbow. Measure each leg separately from the corner point to the outer mounting bracket location, not to the window frame edge.
| Measurement | Where to Start | Where to End | Why It Matters |
|---|---|---|---|
| Leg A length | Corner wall intersection | Outer bracket center on wall A | Determines the straight rod segment length |
| Leg B length | Corner wall intersection | Outer bracket center on wall B | Determines the second rod segment length |
| Elbow offset | Corner point | Center of the double elbow | Confirms the elbow clears the wall corner |
| Total span | Outer bracket A | Outer bracket B (along the L) | Verifies the rod covers the full opening |
Record all four figures before ordering. Sunway recommends measuring twice and noting the wall type at each bracket point.
Step 2: Confirm the 84 Inch Coverage
The 84 Inch L Shaped Double Elbow Curtain Rod refers to the combined usable span across both legs, so the two leg measurements plus the elbow offset should total approximately 84 inches. If your legs measure 40 inches and 40 inches with a 4-inch elbow offset, the total is 84 inches — a correct fit.
| Scenario | Leg A | Leg B | Elbow Offset | Total | Result |
|---|---|---|---|---|---|
| Standard fit | 40 in | 40 in | 4 in | 84 in | Correct |
| Short on one side | 36 in | 44 in | 4 in | 84 in | Correct, asymmetric |
| Oversized opening | 44 in | 44 in | 4 in | 92 in | Rod too short |
| Undersized opening | 36 in | 36 in | 4 in | 76 in | Rod too long |
Step 3: Measure Projection and Return Clearance
Projection is the distance from the wall to the rod centerline. For double rods, measure the front and back rod positions separately so both curtain layers clear the window treatment.
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Measure from the wall surface to the back rod centerline.
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Measure from the wall surface to the front rod centerline.
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Confirm the return distance from the window frame to the bracket base.
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Check that the double elbow does not contact the corner trim.
Sunway double elbow rods are designed so the elbow geometry keeps both rods parallel through the corner. Verify this with a spirit level before drilling.
Step 4: Mark Bracket Positions and Validate
Mark every bracket center with a pencil, then dry-fit the rod sections before final mounting. Confirm the 84 Inch L Shaped Double Elbow Curtain Rod sits level on both legs and that the elbows rotate freely without binding.
Frequently Asked Questions
How do you measure a corner window for a 84 Inch L Shaped Double Elbow Curtain Rod?
Measure each leg from the corner point to the outer bracket center, add the elbow offset, and confirm the total equals 84 inches; then verify projection and return clearance on both walls before marking bracket holes.
Can a 84 Inch L Shaped Double Elbow Curtain Rod be used on a bay window with unequal sides?
Yes, as long as the two legs plus the elbow offset total 84 inches; asymmetric layouts such as 36 inches and 44 inches are common and work correctly when each leg is measured independently.
What is the most common measuring mistake with a 84 Inch L Shaped Double Elbow Curtain Rod?
Measuring to the window frame instead of the bracket center is the most frequent error, which shortens the usable span and leaves gaps at the corners; always measure to bracket centers and double-check the elbow offset.
Contact Us
Ready to confirm your measurements before ordering? Contact Sunway today with your leg lengths, elbow offset, and projection figures, and our team will verify your 84 Inch L Shaped Double Elbow Curtain Rod configuration and recommend the right mounting hardware for your corner window.
