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Q.
What do you call those doohickeys that keep the insulation from blocking the
vents in my bird blocking? The 12 inch insulation I am installing will block
these at the wall edges of my gambrel roof trusses.
A.
They are called
insulation baffles. You can find them in a variety of styles and materials, or
you can make your own. The simplest are just corrugated cardboard that is
folded up on each side so that it can be stapled to the rafters. This provides
an area where the insulation is held away from the roof sheathing to allow air
to flow in at the bird block vents and up by convection to exit at the ridge or
other roof vents.
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