The best replacement for r13 is r19. |
The best alternatives to r13 are rated as following: |
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Your alternative for r13 is not listed? Suggest! |
No companions for r13 have been suggested so far. |
You have in mind a companion for r13 and it is not yet here? Propose! |
r13 |
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r19 |
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r15 insulation |
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