Re: Contracting a new house
Quoting Madball
On a normal one story house, load bearing exterior walls can be 2x4. They can support that weight just fine. The main reason to use 2x6 is for added insulation value, you can obviously get more insulation in a 5 1/2" cavity versus a 3 1/2". If the house is over 2 story, then you must use 2x6 to support the extra weight.
Engineered lumber is becoming much more common these days. The quality of dimensional lumber is getting worse all the time. Trying to find good quality affordable 2x10's or 12's is almost impossible. There will be a day when you won't see any dimensional lumber in homes.
Ditto on the 2x6 vs 2x4 comment.
Down here in southern louisiana insulation is important.
I'll using 2x4's on all walls with r15 batt insulation ...owens corning can still do the job.
So ...it will be 2x4 r15 batts - 1" foil back foam - tyvek - air space - brick (r19+ total).
Under porches it will be 2x4 batts - 1/2" foil back foam - tyvek - durock - stucco (r19or+ total).
Corners will be 2x4 r15 batt - 1/2" foil back foam - 1/2" waferboard - tyvek - finish (r19+ total).
According to
owenscorning/DOE the walls for this zone (4) should be r18 - ceilings r49 - I think that r38 ceilings are most efficient personally.