Stabilizing primaloft

I am about to make a top quilt with Momentum 50 and 1 layer of 6.0 oz per yard Primaloft from thru-hiker. I understand that Primaloft requires stabilizing to keep the fibers from moving. Rainshed recommends 24" centers for weights over 100g/sq meter and greater.

So I understand you can do this using yarn. If I go this route should I quilt to the top layer, bottom layer, or both?

As an alternative to yarn, I was thinking about using lines of stitching for a better appearance. I just bought a Patagonia Nanopuff which uses Primaloft. In looking at it, it appears to use this method to stabilize the Primaloft to the outer shell only. It is continuously sewn in roughly 3" x 5" squares.

http://www.patagonia.com/tsimages/84...120,8&cvt=jpeg

I understand the stitching method would compress the insulation in the areas of stitching, but would this have a significant impact to the warmth of the quilt? Any other considerations I should be thinking about?

I quilt with the yarn loop going all the way through the quilt from top to bottom.

One trick I learned is to cut a piece of cardboard about 3" long and as wide as your quilt is thick. So, if you quilt is 3/4" thick, cut the cardboard 3" x 3/4".

First, pull the yarn down through the quilt leaving a "tail" exposed on top, then bring it back up through the quilt from the bottom. Now place the cardboard on its long edge between the two "tails" of yarn and tie them together on top of the cardboard. Finally slide the cardboard out of the loop and let the quilt loft to fill the space in the loop. This method makes sure that your loops aren't compressing the quilt.

I prefer my loops about 15" apart.

My REI primaloft bag is also sewn through. There are two layers, one sewn to each side of the shell. The rows of stitches alternate between the sides so there is always uncompressed insulation. Seems to work just fine and has held up well.

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Originally Posted by Merganser

My REI primaloft bag is also sewn through. There are two layers, one sewn to each side of the shell. The rows of stitches alternate between the sides so there is always uncompressed insulation. Seems to work just fine and has held up well.

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That's an excellent idea. Too bad I ordered a single 6 oz layer instead of two 3 oz layers :(. There's always next time I guess. Of course, I'll need to determine if the aesthetics are worth the additional $15.

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Originally Posted by MAD777

I quilt with the yarn loop going all the way through the quilt from top to bottom.

I prefer my loops about 15" apart.

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Thanks for the advice.

Well, after nearly a year, I'm finally making headway on my topquilt. Everything is cut and ready to sew.

The Primaloft Sport I am using has a scrim on one side. I believe the scrim gets removed after sewing, correct?

I removed the scrim once everything was pinned, seemed easier then trying to cut around the stich.