Outdoor Fabric Yardage: Solution Dyed, Seams, and Cushions
Outdoor fabric is bought for how long it lasts, not how it feels in the shop. The yardage is the easy part. Choosing cloth and thread that survive the same number of summers is where projects go wrong.
Solution Dyed Is the Phrase That Matters
Outdoor is a marketing word. Solution dyed is a manufacturing one, and it is the single most useful thing on the label.
In a solution dyed acrylic the colour goes into the liquid before the fibre is formed, so the pigment runs all the way through each strand like a stick of rock. There is no surface layer to bleach off. A printed or piece dyed fabric has colour sitting on the outside, and sunlight works on that layer directly. Both can be sold as outdoor cloth. They will not look the same after three summers facing south.
| Type | Usual width | Ask about | Suits |
|---|---|---|---|
| Solution dyed acrylic | 54–60" | Cleaning method, water behaviour | Cushions, awnings, curtains |
| Outdoor polyester | 54" | Whether colour is printed on | Cushions under cover |
| Marine vinyl | 54" | Backing, cold tolerance | Boat and poolside seating |
| Treated canvas | 54–60" | Whether the treatment is renewable | Covers, bags, awnings |
Water resistant and waterproof are not the same claim, and for a seat cushion you may actively want the first rather than the second. Fabric that sheds water completely also traps whatever gets in through the seams.
Two Bench Cushions, and Why the Second Is Cheaper
Take two boxed bench cushions, each 48 by 18 by 3 inches, on 54 inch fabric, with a zipper, no piping and no repeat. Run them through the cushion calculator one at a time and then as a pair:
- One cushion: 2 yards
- Two cushions ordered together: 3.25 yards
- Two cushions ordered separately: 2 + 2 = 4 yards
Three quarters of a yard saved by asking for both at once, and it is worth understanding why rather than taking it on trust. Each cover is one long wrap panel 49 inches wide plus two side strips only 4 inches wide. The wrap is too wide to sit beside another wrap on 54 inch cloth, so two cushions genuinely need two rows of it. The side strips are a different story: four of them side by side take 16 inches, so all four fit comfortably in a single row across the width.
That is the general lesson for outdoor work, where you are usually making several matching pieces at once. Small parts nest and large parts do not, so plan the whole set in one go rather than a cushion at a time.
Your Thread Will Fail Before Your Fabric Does
This is the one that surprises people. You buy good solution dyed acrylic, sew it with the polyester thread already on the shelf, and a few years later the fabric still looks fine while the seams are letting go and the cushion is coming apart in your hands.
Ordinary polyester thread degrades in sunlight faster than the cloth around it. The stitching sits on the outside of every seam with nothing shading it, so it takes the full dose. Broadly, you have three choices:
- Standard polyester: fine indoors or under permanent cover, and the usual reason outdoor seams fail early.
- UV treated bonded polyester: a large improvement for modest money, and the sensible default for garden furniture.
- PTFE thread: effectively immune to sunlight and priced accordingly. Worth it for awnings, boat work, and anything you do not want to take apart again.
None of this changes your yardage. It changes whether the yardage was worth buying, which is why it belongs on the same page.
Build It So It Can Dry
An outdoor cushion is not a sealed unit, and trying to make it one causes the problem it is meant to prevent. Rain finds a way in through the zipper and the needle holes no matter what the face fabric does, so what matters is how fast it gets out again.
Reticulated or quick dry foam lets water pass straight through instead of holding it. Mesh panels or small drainage grommets in the underside give it somewhere to go. Fabric that breathes lets the inside dry rather than staying damp and growing something. A cushion built to keep water out and then left sitting in it is the usual cause of a mouldy insert inside a perfectly good cover.
Cleaning advice is specific to each product, so work from the sheet for what you actually bought. As one manufacturer example, see the Sunbrella cleaning guide. It covers that maker’s products and does not validate the yardage maths here.