It’s 1975 and If you could have seen into the future….
PoppyNovice
| Posted in Energy, Heating & Insulation on
My home is 2-story (1975 Zone 3) with a hipped roof that makes up 1/3 of the ceiling/wall of the 2ndfloor.
On the North side of the house, 2ndfloor, there are 2 storage closets (triangle shaped) with the roof being the outer wall. These closets are insulated (both inner and outer wall) and covered with unfinished drywall, but the difference between the outside and inside temperature isn’t much. I want to improve the insulation but am unsure of the best way.
Currently it is insulated (ceiling/roof side) with 3 ½’’ R-11 Batts (double layers in some places) [truss spacing is 5 ½’’ x 24’’]
I can replace the current Batts with 3 ½’’ R-13 but was wondering if I can replace them with 6 ½ R-19 without restricting airflow?
Thanks in advance
Poppy
Replies
I would say Holy Poop - Time to buy some stocks!
I would also say - "Wow, energy is going to get expensive!"... and "Who would have known that air sealing was so important?"
http://www.energystar.gov/index.cfm?c=home_sealing.hm_improvement_insulation_table
You need at least R30... To get R30 in 5.5" you need foam... lots of expensive sprayed foam.
Or, you can move your insulation plane to the roof deck. Insulate the underside with bats or cellulose, then cover the top od the deck with a solid layer of rigid polyiso foam board, 2 layers of 1" board, stagered taped seams. Over that you lay 2x4s on the flat and screw thos down into your existing rafters, then add a new roof deck on top of that.
You now have an AIR TIGHT roof at R30 (or more if you want additional energy savings) that is vented AND has an additional water drainage plane below the deck.
PS: I would also say David Lee Roth will turn out to be the most level headed member of Van Halen, but if I said it outloud it would get me commited.