How To Insulate Scissor Truss Roof

Most economical when the difference in slope between the top and bottom chords is at least 3 12 or the bottom chord pitch is no more than half the top chord pitch.

How to insulate scissor truss roof. The right way to insulate attics and cathedral ceilings with batts using certain t. The finish ceiling option if you want to keep your exposed roof trusses visible then the easiest way to add some insulation is to add it to the exterior side of the finished ceiling. If you wanted to insulate your sloped roof assembly with cellulose you should have used common sawn lumber rafters. Then we fit a piece of foam across the rafter bay to create a one inch air space under the sheathing and we fit a piece of foam up under that channel at the outside edge of the wall plate sealing the foam board to the framing with gun foam.

The screws secure the counter purlin to each rafter or top chord. A variety of insulation materials can be used to insulate scissors truss roofs as long as. Your two best choices are probably to insulate from above with one or more layers of rigid foam or nailbase or sips or to insulate from below with spray polyurethane foam. By keeping the insulation on the outside it hides it from viewers while still keeping the insulation trapped inside.

Like ordinary roof trusses scissors trusses come with or without a raised heel sometimes called an energy heel. Scissors provides a cathedral or vaulted ceiling. So it s probably too late for cellulose. The boards are secured by a screw fixed counter purlin running from eave to roof ridge above each rafter or top chord.

We cut one inch strips from the foam board and tack them to the truss directly under the roof sheathing.