Insulation Of Truss Or Raftertype Roofceilings

The thicker batts now available for insulating roofs are made in widths equal to the full centre-to-centre distance of standard roof framing. The lower portion is slightly compressed when installed between the framing, but the upper portion retains its width and covers the tops of the framing, thus reducing heat loss through the framing.

Eave details to avoid blocking ventilation: (A) suggested detail with ordinary truss heel joint; (B) alternative design with raised truss heel joint.

air ventilation baffle mesh screen

baffle i" (25 mm) minimum mesh screen

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baffle i" (25 mm) minimum mesh screen

Raised Heel Truss Detail

Loose-fill insulation can also be used to cover the framing and, unlike the standardized batts, offers the advantage that only the amount desired need be installed. On the other hand, care must be exercised to ensure it is installed at the correct density or settling may occur. Loose-fill insulation must also be prevented from spilling onto eave vents and from being displaced by wind entering the vents. Baffles such as those shown in Figure 125 must be used to avoid blocking air circulation.

Batt and rigid type insulation should be installed so that it fits tightly against framing members. Care should be taken to ensure that air circulation to and from eave vents is not blocked.

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