Rafter baffle width reduction

[MerlinsBeard]

I have some rafters that are 16" spaced, but some rafter bays are a little on the skinny side (around 12" in the sides of the dormer section of the ceiling).

I'm using ADO Provent 4' x 16" since that was what I could find locally. Because of the X protrusions, Just cutting it in half and overlapping the two sides doesn't look like it would be very form fitting.

Cutting from one end means I'd have to force a new crease to try to fit the shape.

If I have to make a new crease, I might as well try to add a "V" in the middle so that instead the baffle profile looks like

_________ __________
___/ \_/ \___

Since I'm adding the vertical pinch, it would effectively reduce the width and hopefully not horribly disfigure the baffle plastic. I'm thinking of setting up some kind of jig and using a heat gun to try to force the rafter baffle into the profile.

Thoughts? Is this a reasonable idea, or maybe a better alternative?

 

[K'ledgeBldr]

I think you’re making a mountain out of a mole hill.
Cut in half, overlap, install. They are to provide a means of air to travel- as long as there is some opening it is sufficient (path of least resistance).

But, if you feel it’s absolutely necessary to have a fully open cavity- you can glue the two half’s together to make it rigid; or make one out of cardboard- which was the material of choice for a long time before they started using plastic.

 

[duneslider]

cardboard works just great, especially for the smaller spaces.