Wash. Admin. Code § 51-11C-610221 - Tables A102.2.4 - Steel truss framed ceiling U[o] values
Table A102.2.4(1) Steel Trussa Framed Ceiling Uo
Cavity |
Truss Span (ft) |
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R-value |
12 |
14 |
16 |
18 |
20 |
22 |
24 |
26 |
28 |
30 |
32 |
34 |
36 |
19 |
0.1075 |
0.0991 |
0.0928 |
0.0878 |
0.0839 |
0.0807 |
0.0780 |
0.0757 |
0.0737 |
0.0720 |
0.0706 |
0.0693 |
0.0681 |
30 |
0.0907 |
0.0823 |
0.0760 |
0.0710 |
0.0671 |
0.0638 |
0.0612 |
0.0589 |
0.0569 |
0.0552 |
0.0538 |
0.0525 |
0.0513 |
38 |
0.0844 |
0.0759 |
0.0696 |
0.0647 |
0.0607 |
0.0575 |
0.0548 |
0.0525 |
0.0506 |
0.0489 |
0.0474 |
0.0461 |
0.0449 |
49 |
0.0789 |
0.0704 |
0.0641 |
0.0592 |
0.0552 |
0.0520 |
0.0493 |
0.0470 |
0.0451 |
0.0434 |
0.0419 |
0.0406 |
0.0395 |
Table A102.2.4(2) Steel Trussa Framed Ceiling Uo with R-3 Sheathing
Cavity |
Truss Span (ft) |
||||||||||||
R-value |
12 |
14 |
16 |
18 |
20 |
22 |
24 |
26 |
28 |
30 |
32 |
34 |
36 |
19 |
0.0809 |
0.0763 |
0.0728 |
0.0701 |
0.0679 |
0.0661 |
0.0647 |
0.0634 |
0.0623 |
0.0614 |
0.0606 |
0.0599 |
0.0592 |
30 |
0.0641 |
0.0595 |
0.0560 |
0.0533 |
0.0511 |
0.0493 |
0.0478 |
0.0466 |
0.0455 |
0.0446 |
0.0438 |
0.0431 |
0.0424 |
38 |
0.0577 |
0.0531 |
0.0496 |
0.0469 |
0.0447 |
0.0430 |
0.0415 |
0.0402 |
0.0392 |
0.0382 |
0.0374 |
0.0367 |
0.0361 |
49 |
0.0523 |
0.0476 |
0.0441 |
0.0414 |
0.0393 |
0.0375 |
0.0360 |
0.0348 |
0.0337 |
0.0328 |
0.0319 |
0.0312 |
0.0306 |
Table A102.2.4(3) Steel Trussa Framed Ceiling Uo with R-5 Sheathing
Cavity |
Truss Span (ft) |
||||||||||||
R-value |
12 |
14 |
16 |
18 |
20 |
22 |
24 |
26 |
28 |
30 |
32 |
34 |
36 |
19 |
0.0732 |
0.0697 |
0.0670 |
0.0649 |
0.0633 |
0.0619 |
0.0608 |
0.0598 |
0.0590 |
0.0583 |
0.0577 |
0.0571 |
0.0567 |
30 |
0.0564 |
0.0529 |
0.0502 |
0.0481 |
0.0465 |
0.0451 |
0.0440 |
0.0430 |
0.0422 |
0.0415 |
0.0409 |
0.0403 |
0.0399 |
38 |
0.0501 |
0.0465 |
0.0438 |
0.0418 |
0.0401 |
0.0388 |
0.0376 |
0.0367 |
0.0359 |
0.0351 |
0.0345 |
0.0340 |
0.0335 |
49 |
0.0446 |
0.0410 |
0.0384 |
0.0363 |
0.0346 |
0.0333 |
0.0322 |
0.0312 |
0.0304 |
0.0297 |
0.0291 |
0.0285 |
0.0280 |
Table A102.2.4(4) Steel Trussa Framed Ceiling Uo with R-10 Sheathing
Cavity |
Truss Span (ft) |
||||||||||||
R-value |
12 |
14 |
16 |
18 |
20 |
22 |
24 |
26 |
28 |
30 |
32 |
34 |
36 |
19 |
0.0626 |
0.0606 |
0.0590 |
0.0578 |
0.0569 |
0.0561 |
0.0555 |
0.0549 |
0.0545 |
0.0541 |
0.0537 |
0.0534 |
0.0531 |
30 |
0.0458 |
0.0437 |
0.0422 |
0.0410 |
0.0401 |
0.0393 |
0.0387 |
0.0381 |
0.0377 |
0.0373 |
0.0369 |
0.0366 |
0.0363 |
38 |
0.0394 |
0.0374 |
0.0359 |
0.0347 |
0.0337 |
0.0330 |
0.0323 |
0.0318 |
0.0313 |
0.0309 |
0.0305 |
0.0302 |
0.0299 |
49 |
0.0339 |
0.0319 |
0.0304 |
0.0292 |
0.0283 |
0.0275 |
0.0268 |
0.0263 |
0.0258 |
0.0254 |
0.0251 |
0.0247 |
0.0245 |
Table A102.2.4(5) Steel Trussa Framed Ceiling Uo with R-15 Sheathing
Cavity |
Truss Span (ft) |
||||||||||||
R-value |
12 |
14 |
16 |
18 |
20 |
22 |
24 |
26 |
28 |
30 |
32 |
34 |
36 |
19 |
0.0561 |
0.0550 |
0.0541 |
0.0535 |
0.0530 |
0.0526 |
0.0522 |
0.0519 |
0.0517 |
0.0515 |
0.0513 |
0.0511 |
0.0509 |
30 |
0.0393 |
0.0382 |
0.0373 |
0.0367 |
0.0362 |
0.0358 |
0.0354 |
0.0351 |
0.0349 |
0.0347 |
0.0345 |
0.0343 |
0.0341 |
38 |
0.0329 |
0.0318 |
0.0310 |
0.0303 |
0.0298 |
0.0294 |
0.0291 |
0.0288 |
0.0285 |
0.0283 |
0.0281 |
0.0279 |
0.0278 |
49 |
0.0274 |
0.0263 |
0.0255 |
0.0249 |
0.0244 |
0.0239 |
0.0236 |
0.0233 |
0.0230 |
0.0228 |
0.0226 |
0.0225 |
0.0223 |
Footnotes for Tables A102.2.4(1) through A102.2.4(5) |
a Assembly values based on 24 inch on center truss spacing; 11 Truss member connections penetrating insulation (4 at the eaves, 7 in the interior space); 1/2 inch drywall ceiling; all truss members are 2x4 "C" channels with a solid web. |
bCeiling sheathing installed between bottom chord and drywall. |
Notes
Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. 13-04-056, § 51-11C-610221, filed 2/1/13, effective 7/1/13.
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
Table A102.2.4(1) Steel Trussa Framed Ceiling Uo
Cavity | Truss Span (ft) | ||||||||||||
R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 |
19 | 0.1075 | 0.0991 | 0.0928 | 0.0878 | 0.0839 | 0.0807 | 0.0780 | 0.0757 | 0.0737 | 0.0720 | 0.0706 | 0.0693 | 0.0681 |
30 | 0.0907 | 0.0823 | 0.0760 | 0.0710 | 0.0671 | 0.0638 | 0.0612 | 0.0589 | 0.0569 | 0.0552 | 0.0538 | 0.0525 | 0.0513 |
38 | 0.0844 | 0.0759 | 0.0696 | 0.0647 | 0.0607 | 0.0575 | 0.0548 | 0.0525 | 0.0506 | 0.0489 | 0.0474 | 0.0461 | 0.0449 |
49 | 0.0789 | 0.0704 | 0.0641 | 0.0592 | 0.0552 | 0.0520 | 0.0493 | 0.0470 | 0.0451 | 0.0434 | 0.0419 | 0.0406 | 0.0395 |
Table A102.2.4(2) Steel Trussa Framed Ceiling Uo with R-3 Sheathing
Cavity | Truss Span (ft) | ||||||||||||
R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 |
19 | 0.0809 | 0.0763 | 0.0728 | 0.0701 | 0.0679 | 0.0661 | 0.0647 | 0.0634 | 0.0623 | 0.0614 | 0.0606 | 0.0599 | 0.0592 |
30 | 0.0641 | 0.0595 | 0.0560 | 0.0533 | 0.0511 | 0.0493 | 0.0478 | 0.0466 | 0.0455 | 0.0446 | 0.0438 | 0.0431 | 0.0424 |
38 | 0.0577 | 0.0531 | 0.0496 | 0.0469 | 0.0447 | 0.0430 | 0.0415 | 0.0402 | 0.0392 | 0.0382 | 0.0374 | 0.0367 | 0.0361 |
49 | 0.0523 | 0.0476 | 0.0441 | 0.0414 | 0.0393 | 0.0375 | 0.0360 | 0.0348 | 0.0337 | 0.0328 | 0.0319 | 0.0312 | 0.0306 |
Table A102.2.4(3) Steel Trussa Framed Ceiling Uo with R-5 Sheathing
Cavity | Truss Span (ft) | ||||||||||||
R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 |
19 | 0.0732 | 0.0697 | 0.0670 | 0.0649 | 0.0633 | 0.0619 | 0.0608 | 0.0598 | 0.0590 | 0.0583 | 0.0577 | 0.0571 | 0.0567 |
30 | 0.0564 | 0.0529 | 0.0502 | 0.0481 | 0.0465 | 0.0451 | 0.0440 | 0.0430 | 0.0422 | 0.0415 | 0.0409 | 0.0403 | 0.0399 |
38 | 0.0501 | 0.0465 | 0.0438 | 0.0418 | 0.0401 | 0.0388 | 0.0376 | 0.0367 | 0.0359 | 0.0351 | 0.0345 | 0.0340 | 0.0335 |
49 | 0.0446 | 0.0410 | 0.0384 | 0.0363 | 0.0346 | 0.0333 | 0.0322 | 0.0312 | 0.0304 | 0.0297 | 0.0291 | 0.0285 | 0.0280 |
Table A102.2.4(4) Steel Trussa Framed Ceiling Uo with R-10 Sheathing
Cavity | Truss Span (ft) | ||||||||||||
R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 |
19 | 0.0626 | 0.0606 | 0.0590 | 0.0578 | 0.0569 | 0.0561 | 0.0555 | 0.0549 | 0.0545 | 0.0541 | 0.0537 | 0.0534 | 0.0531 |
30 | 0.0458 | 0.0437 | 0.0422 | 0.0410 | 0.0401 | 0.0393 | 0.0387 | 0.0381 | 0.0377 | 0.0373 | 0.0369 | 0.0366 | 0.0363 |
38 | 0.0394 | 0.0374 | 0.0359 | 0.0347 | 0.0337 | 0.0330 | 0.0323 | 0.0318 | 0.0313 | 0.0309 | 0.0305 | 0.0302 | 0.0299 |
49 | 0.0339 | 0.0319 | 0.0304 | 0.0292 | 0.0283 | 0.0275 | 0.0268 | 0.0263 | 0.0258 | 0.0254 | 0.0251 | 0.0247 | 0.0245 |
Table A102.2.4(5) Steel Trussa Framed Ceiling Uo with R-15 Sheathing
Cavity | Truss Span (ft) | ||||||||||||
R-value | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 |
19 | 0.0561 | 0.0550 | 0.0541 | 0.0535 | 0.0530 | 0.0526 | 0.0522 | 0.0519 | 0.0517 | 0.0515 | 0.0513 | 0.0511 | 0.0509 |
30 | 0.0393 | 0.0382 | 0.0373 | 0.0367 | 0.0362 | 0.0358 | 0.0354 | 0.0351 | 0.0349 | 0.0347 | 0.0345 | 0.0343 | 0.0341 |
38 | 0.0329 | 0.0318 | 0.0310 | 0.0303 | 0.0298 | 0.0294 | 0.0291 | 0.0288 | 0.0285 | 0.0283 | 0.0281 | 0.0279 | 0.0278 |
49 | 0.0274 | 0.0263 | 0.0255 | 0.0249 | 0.0244 | 0.0239 | 0.0236 | 0.0233 | 0.0230 | 0.0228 | 0.0226 | 0.0225 | 0.0223 |
Footnotes for Tables A102.2.4(1) through A102.2.4(5) |
a Assembly values based on 24 inch on center truss spacing; 11 Truss member connections penetrating insulation (4 at the eaves, 7 in the interior space); 1/2 inch drywall ceiling; all truss members are 2x4 "C" channels with a solid web. |
bCeiling sheathing installed between bottom chord and drywall. |
Notes
Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. 13-04-056, § 51-11C-610221, filed 2/1/13, effective 7/1/13.