How to Foundation Paper Piece Scrappy Half-Square Triangles
Ready to learn how to foundation paper piece or just want to review? I’m going to guide you through the process step by step. I will be using my preprinted Scrappy Triangle foundation pads, but the steps apply to any foundation paper-pieced quilt blocks.
Ten years ago I was terrified of foundation paper-piecing (FPP) and couldn't wrap my mind around the idea of putting fabric on the back of paper and then sewing on the other side of the paper. It was just weird. But after making a few foundation paper-pieced blocks, it became one of my favorite piecing methods. When I started the Year of Scrappy Triangles, I wanted to link to a post where people could learn how to paper piece if they didn't already know how, but I couldn't find one I liked. So, here is my contribution. Let's get started!
Foundation Paper Piecing
What is Foundation Paper-Piecing? (sometimes called paper-piecing) Foundation paper-piecing is when the outline of a quilt block is printed on a paper foundation and fabric is sewn together on the paper using the outline as a sewing guide. When the block is complete the paper foundation is removed. Amazingly accurate piecing is possible with FPP, even with the smallest of pieces. Each foundation paper-pieced block is different, but same basic steps and techniques apply to all.
Supplies:
Necessary:
Foundations - There are two options
Pre-printed foundations on specialty paper that require no printing/copying
Print your own foundations on regular copy paper or specialty foundation paper
Basic sewing supplies including: sewing machine, thread, seam ripper, cutting mat, and ruler.
Flat head pins or glue stick (school or specialty)
Add-a-quarter ruler (optional)
Seam roller (optional)
Step 1: Copy the Foundation
If you are not using pre printed foundations, the first step is to copy or print the needed foundation. You can use regular printer paper or use specialty foundation paper. Foundation paper is a thinner paper which is easier to see through and tear off after finishing the block, but it is more expensive. I usually use regular printer paper but making these Scrappy Triangles using these foundation pads has made me rethink that decision.
Before you print, check that the sizing is at 100% and Fit to Size is not selected. After copying, always check that the pattern has copied or printed to the correct size. There will box that is 1" square that you can measure to test if the foundation printed correctly. If you know the size of the finished unit, you can measure the printed foundation itself.
Step 2: Cut and Prepare Fabric
Each section of the foundation is numbered and a different fabrics will go in each section. Decide which fabric you wish to use in each section. Cut the fabric approximately ½” larger than the area the it will need to cover. If there are many different pieces, labeling with help keep them in order.
You can also write the color of fabric you will use for each section on the foundation itself so you don't get confused about what fabric goes where mid-piecing. (Don't ask me how many times I have sewn the wrong fabric to the wrong section!)
Step 3: Prepare Your Sewing Machine
Foundation paper-pieced blocks are sewn on a piece of paper. When the block is finished, the paper will be removed. Removing the foundation paper is much easier if the stitch length is smaller. More perforations in the paper = easier tearing.
Prepare your sewing machine by reducing the stitch length to 18-20 stitches per inch. (Some people prefer even more stitches per inch.) This is a 1.5 setting on most sewing machines. The smaller stitch size will allow the paper to be pulled off easily when the block is finished. When I am making very small FPP units I like to reduce my stitch length even further to 1.3.
Controversial option: Use polyester thread instead of cotton. It is stronger than cotton and can withstand the pressure of removing the papers.
Step 4: Trim and Sew
When sewing the fabric pieces together, you will sew on the lines that divide the sections. For example, when you sew piece 2 to piece 1, you sew on the line between piece 1 and 2.
To start, place the wrong side of the fabric that will go in section 1 on the back side of the paper foundation. (The wrong side of the fabric should touch the paper.) Hold them up to a light to make sure the fabric covers the entire area of section 1. It should also overlap the other sections by at least ¼” on all sides. Secure the fabric with a flat head pin or a dab of glue stick. (Ball head pins will not allow the ruler to lay flat when it is time to trim.)
Locate the line that runs between section 1 and 2. Using a postcard or piece of cardstock as a guide, fold the foundation back along the line between section 1 and 2.
Line up the ¼” line on your ruler with the edge of the paper and trim the exposed fabric to ¼”.
TIP: You can use a small regular ruler for trimming, but they also make specialty Add-a-Quarter rulers. They have a groove on the bottom that butts up against the folded paper and makes it easy to trim 1/4”. I used regular rulers for years but finally bought an Add-a-Quarter ruler once my close up eyesight started to go. It was a game changer! No more squinting!
Fold the paper back down and flip the foundation over to the backside. Place the second piece of fabric on top of the first piece of fabric, right sides together and lined up along the trimmed edge. Pin in place.
Flip the foundation over to the printed side. Double check that the stitch length is reduced to 1.5 and sew along the line between sections 1 and 2. Start a ½” before the line so the beginning of the sewing will be in the seam allowances. You can use the fold as a sewing guide until you hit the line. Continue sewing and stop ½” past the end of the line.
TIP: If you are making multiples of the same foundation, sew all of the 2 pieces onto the 1 pieces. Trimming, pinning, and sewing the same numbered section to all the foundations at the same time speeds the piecing process.
Set the seam and press piece 2 open. If the paper starts to curl up or brown, the iron is too hot and should be turned down. Do not use steam to avoid the possibility of the ink bleeding. Some quilters press the seams open using a seam roller or their fingers/thumbs.
After pressing, hold the foundation up to the light and make sure the 2nd fabric covers section 2 completely and overlaps the other sections by at least ¼”.
Paper side up, place the cardstock on the line between section 3 and sections 1 and 2. Fold the foundation back over the cardstock. Some fabric will come up with the paper. Simply pull the fabric down and off of the paper. Using the edge of the paper as a guide, trim the fabric to ¼”.
Fold the foundation back down, line up the 3rd piece of fabric with the newly trimmed edge, pin, flip and sew, remembering to start a ½” before the line.
Press piece 3 open.
Continue to repeat these steps for all sections of the foundation. The basic foundation piecing formula is trim, sew and press. It is that simple. As you go, hold the foundation up to the light to make sure the fabric covers all sections completely.
Step 5: Trim to Size
Once the block is pieced, trim the paper-pieced unit to size by lining up the inner solid line with the ¼” line on the ruler. Then trim off the excess. I trim the blocks this way because it is difficult to be sure the ruler is lined up exactly on the outer dotted line and the trim is more accurate when measured from the solid inner line.
Step 6: Sew the paper-pieced units together
To sew the foundations together simply line up the edges and sew along the line. Remove the papers from the seams and press the seam to the side or open.
If you are instructed to sew the FPP unit to a traditionally pieced unit, simply leave the paper on and sew the units together as normal. Remove the paper only after the foundation is sewn to other quilt pieces on all sides. This will eliminate any possible stretching and distortion of the block.
If you are still having a hard time removing the papers, you may want to give Carolina Moore’s Water Pen a try. It dampens the paper so it tears off more easily.
That's it! Just follow these steps and you will be foundation paper piecing like I pro. Now go and make all those foundation paper-pieced projects you've always loved!
Want to keep a copy of these instructions by you while you paper piece? Click below to download a condensed printable version of these instructions.