I would guess the walls where R12 is used are below grade (concrete foundation on the sides), that is why the builder does not use R20. Of course, R20 is better but the price increase will include the extra cost of switching from 2x4 wall framing to 2x6, on top of the price difference between R12 and R20. R40, for sure, is even better but it is usually used in the attic, seldom heard being used behind walls.
I would guess the walls where R12 is used are below grade (concrete foundation on the sides), that is why the builder does not use R20. Of course, R20 is better but the price increase will include the ...& b7 }; _7 Y: l7 p9 P4 z8 W- E
ceramistpalace 发表于 2010-2-10 18:27
$ X$ f+ O6 G) O! s i" qbasement用的是friction fit insulation,不像屋顶,和外墙一样是fabricglass的,应该不用upgrade framing吧?然后仔细看了看,specifications上说exterior wall都是用的2“x6”的spruce,就是不知道basement的外墙的frame用的是什么材料。
6#Phaeton " D. Q# ]* z! h5 n4 Z8 Z3 c' w' c6 Q8 L2 o' Z# j/ B( K
Your house will still have below-grade concrete foundation walls on 2 sides and the front, a 2x4 frame on the inside of the wall is needed to accommodate the insulation.(just like a regular non-walkout basement)
就我所理解的,做点评论。欢迎讨论$ `2 u' x' c7 G* V- S
现在地下室都是水泥外墙,有足够的厚度阻挡热量外流。即使外面-50度,内墙的温度也会在0度以上(在不加热的情况下)。现代建筑一般地下室再加R8的Insulation就足够了。你的builder用R12已经是Upgrade了。屋顶用R40是近10来年的事。以前都是R32或更低的Insulation。" n7 t8 o+ l5 m
当然,如果LZ真的那么在乎绝缘性,你可以跟Builder提R2000Program。那是一种Certified System。+ ?1 N. Q! p' s2 w6 l' v+ G0 V 但高绝缘体系(包括现代的民用房建筑体系)有一个弱点,它是霉菌生长的主要根源。而霉菌是正常生活中对人体最大的危害。
sales刚刚回信给我,说是给我问问看。但是他说建议我不用升级,二是把钱花在basement的地面上比较合适。“Personally I would not upgrade the walls. I would put my money in the floor. On my last home I put 2x4 strapping on the floor and rigid insulation in between. I then put 5/8 tongue and groove plywood on top and Cork on top of that. Very cozy. Very warm on the feet.”
sales刚刚回信给我,说是给我问问看。但是他说建议我不用升级,二是把钱花在basement的地面上比较合适。“Personally I would not upgrade the walls. I would put my money in the floor. On my last home I put 2x ... , S- H& ?( P9 g* N2 vPhaeton 发表于 2010-2-10 21:01