Wedge Shaped Cushion Cover Tutorial

Wedge shaped cushion cover

Wedge shaped cushion cover

Recently I was asked for an article on making a wedge shaped cushion cover.  Most cushions we cover are square, rectangular or round, so this was a good opportunity to look at making covers for cushions of irregular shape.  I bought a wedge of foam from a local shop so my measurements here are naturally for that specific wedge.

Over Christmas I felt that I could well have more people than chairs in my tiny sitting room.  The wedge proved useful for someone to rest against a wall while sitting on the floor.

Wedge shaped foam

Wedge shaped foam

Cutting requirements for the wedge shaped cushion cover

Before you can buy the fabric or even think of cutting it, you need to take careful measurements of each face of the wedge.

I measured each face (six in total) and then added 1″ to each measurement so that I could use a 1/2″ seam allowance.

I thought that the wedge was shaped so that the front and the back were both at an angle.  In fact if you look carefully at the photo you’ll see that the back is at right angles to the base and the front is at an angle.

This obviously makes a difference to the pieces that you cut.  When I cut the two wedge shaped pieces for the sides I cut them with the fabric folded over so that my two wedge shapes were mirror images of each other.

List of sizes

List of sizes

You also need to decide which face you are going to put the zip in.  For my wedge I have sewn the zip into the base.

The measurement for the base was 9″ by 21″.  Instead of using one piece, I cut two pieces 5″ by 21″.  This was so that I could sew the zip in the middle between the two rectangles.

Add the zip

I began by turning under a 3/4″ hem hem on one long edge of each of the base rectangles.  Then I sewed the zip to these two edges so that the rectangles were joined by the zip in the middle.  I used an 18″ zip because that’s what I had in stock.  This was a mistake – if I had used a longer zip I would have found it easier to pull the cover over the wedge when I had finished.

Assemble the wedge shaped cushion cover

Add the front and back first

Add the front and back first

Next I added the front and back panels to the base section, making one long strip.  The sides (the wedge shaped pieces) are next to be sewn.  They will be added to the ends of the base section.  The fabric is now in a cross shape.

When sewing the sides in place, be careful to sew only as far as the seam lines – see below.

I had to be careful when adding the side sections because the back of the wedge is at right angles to the base while the front is angled against the base.  This meant that I had to check that the right angled corners of each side section were on the same side as each other – on the left in the photo.

Sew the sides to the back and front

Sew the sides to the back and front

Next I needed to join the side sections to the back and front sections.  This involves pulling the edge of the back to the edge of the side section.  This means that you will have three seams joining together at the base.  Because you only sewed as far as the seam lines above, this should leave you sufficient fabric to form a seam.  This time you need to start sewing with your needle on the seam line joining the base to the front or back.

You are making a pouch at this stage – almost like putting the side gusset in a bag.  Be careful to smooth all the other fabric out of the way before you begin sewing.  There are four seams to sew in this way – two sides of each side section.

Sew the sides of the top

Sew the sides of the top

Add the top section

Before you sew the top in place, open the zip at least half way.  This will enable you to turn the project right side out.

Now with right sides together sew the two short ends of the top to the tops of the side sections.

Finally sew the long sides of the top to the front and back of the cushion cover.  These seams again need care as you have three seams meeting at each point.

One thing (or do I mean another thing) that I could have improved upon:  the front of the wedge is slightly longer than the back because it’s at an angle to the base.  I didn’t pick up on this when I was measuring the foam wedge.  It meant that the front section was slightly shorter than the sides and back when I sewed everything together.  It was easy enough to trim everything to the same length before I sewed the seams, but I thought that it was worth mentioning as something you might find helpful.

Making a wedge cushion cover is mainly a matter of logic.  Begin at the base and then gradually add the other pieces to build up your wedge, finishing with the top section.  I hope you’ll find this article useful no matter what shape of cushion you are making a cover for.

Here’s the video:

Thanks for visiting my blog.

I hope to see you again soon.