I have a 1950's house, with
about 3" of blown cellulose in the attic (I assume none in the
walls). After two sequential $250+ heating bills, I decided to address
the insulatory nature of the home. My question is, without the
addition of a ridge vent, would those of you in the know recommend
installing radiant barrier or blowing in another 8" of insulation (not
fiberglass). The costs appear to be the same (or assume they are), and
I can only budget for one. Assume I would be doing either of the
installations. One additional question involves painting the roofs
underlayment with a ceramic/metallic paint marketed for it's radiant
and insulatory benefits. Thank you in advance. - Dan
I would add the 8" It will do far more in the long run for you. I would
also suggest checking out the walls. If they lack insulation (in the 50's
most if not all homes in my area would have had insulation) taking care of
them will pay back quickly enough to make it worthwhile and you also gain
If you have questions about roof venting, I suggest you have that
checked. However I would guess that if you don't see problems after 50+
years, your venting is not all that bad.
Where do you live , what are your low temps. Blown in cellulose settles
and any future leak will ruin it as it is paper. Fiberglass batts are
best and R 50 is worth the investment for most areas. And many areas
could use even higher R value. Foam in walls is good but how will you
know if its been filled, and will it break your walls when it expands
Dan, since you live in a zone 7 area R 50 - 60 would be great, it will
also help in your air conditioning bills. you do have central air ,
yes, because summer heat rises, and i know the Carolinas are hot...
Im in zone 5 we go to - 20- 25, i put in R 100, Remember
minimums are just that the minimum so you dont go broke paying the
utilities, before you cant pay the bank . people would if allowed, build
houses without insulation, Its also the best investment you can make, as
interest rates are low and gas and electric will always go up.
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