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Blow-in fiberglass insulation for walls is highly subjectable in forms of efficiency. It will do the same job as batt insulation(less money). If the wall is not air-tight, the insulation is only an air filter. The entire envelope should consist of not only the insulation, but a house wrap expanding foam(fire rated) for sealing all holes/penetrations(pipes, wires, etc.) and sealing the wall plates(sill seal or caulk).
The chart you posted is the recommended R-values for your zone. "Other walls" is considered attic kneewalls. R-19 is the minimal requirement. But for the south I believe this is too low a recommendation. I believe it should be R-30; the same for vaulted ceilings using supporting rafters.
The chart says to me that the exterior wall framing is 2x4.
Here in Colorado, I have not seen any new construction with less than 2x6 framing.
Time to start over from the beginning.
The chart says to me that the exterior wall framing is 2x4.
Here in Colorado, I have not seen any new construction with less than 2x6 framing.
Time to start over from the beginning.
What is the difference between 2x4 and 2x6? I do not think I have an option to upgrade to 2x6.
What is the difference between 2x4 and 2x6? I do not think I have an option to upgrade to 2x6.
How much insulation you can stuff into the wall. 2x4 roughly R13, 2x6 roughly R18. Looking at weather average for Frisco TX, your average January low is 30 and your average July high is 93 - with those temps, you really need to be taking insulation seriously, unless you like higher utility bills or an uncomfortable house. When a house is being built is the easiest and cheapest time to insulate.
If 2x6 is not an option, you are working with a lousy builder - or maybe the rock-bottom cheapest, which is looking the same as "lousiest." Or, who knows, this might be part of "we do things different in Texas." I can tell you that I live in a milder climate than you do, and our building codes require quite a bit more than what you are being offered.
What is the difference between 2x4 and 2x6? I do not think I have an option to upgrade to 2x6.
It is much colder in Colorado, so they use 2x6's to get the required R19 vs Texas with a much milder climate only needing a R13. FWIW, no fire rated expanding foam is required in residential construction except possibly multi family.
Insulation is just as important for blocking heat out as keeping heat in.
You have 2x4 exterior framing that can only hold a maximum of 3.5 inches of insulation which is usually r13.
In that chart I don't understand why they are insulating the roof? If the ceilings are r38 why do the roof too? Do you have a large attic that could be finished into a living space in the future? If so then that is why they are doing the roof.
Insulation is just as important for blocking heat out as keeping heat in.
You have 2x4 exterior framing that can only hold a maximum of 3.5 inches of insulation which is usually r13.
In that chart I don't understand why they are insulating the roof? If the ceilings are r38 why do the roof too? Do you have a large attic that could be finished into a living space in the future? If so then that is why they are doing the roof.
I do not have large attic, not sure about the roof. Could it be garage roof?
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Snookered
