how much difference between R19 and R20 insulation, need help, thanks

KochFord

how much difference in price and quality between R19 and R20 per square feet ??


- Y- t4 t/ J0 X) S( Cwho can explain why use R30 for attic.

Thanks

爱城飞雪

1# KochFord
The higher R value, The better insulation performance.
% ]  V+ [! A, [& ?0 u1 BIn winter, the hot air always floats up due to thermal buoyancy, so R value for the roof is normally higher than that for exterior wall.
Hope my answer helps.

爱城飞雪

1# KochFord


R19 is not commonly used.

chic-yong

R值固然重要，但隔热材料更重要。即使R值相同，不同的隔热材料性能也是不一样的。

KochFord

谢谢楼上两位