Frame Ceilings and Roofs

Any ceiling below an unheated space should be insulated with materials having a rating of R-19 or better. The ceilings should have

Table 3-6 Slab Edge Heat Loss

Outdoor Design Temperature, °F	Total Width of Insulation, in Rated R-5	Heat Loss per Foot of Exposed Slab Edge Watts Btu/h
— 30 and colder	24	10.0	34
-25 to —29	24	9.4	32
—20 to —24	24	8.8	30
— 15 to — 19	24	8.2	28
4 1 — To 9 1 —	24	7.9	27
-15 to -9	24	7.3	25
0 to — 4	24	7.0	24
+ 5 to + 1	24	6.4	22
+ 10 to +6	18	6.2	21
+ 15 to + 11	12	6.2	21
+ 20 to + 16	Edge only	6.2	21
+ 21 and warmer	None	—	—

Courtesy Electric Energy Association

Figure 3-24 Ceiling and roof frame construction.

A maximum U-value of 0.05. Some methods for providing such insulation are the following:

1. Staple blankets or batts to the joists before the finished ceiling is applied (Figure 3-24).

2. Blow or manually apply loose insulation between ceiling joists from above.

3. Spray on insulation between the joists from above.

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