Cape Cod Roof Insulation

remernorth · 09-05-2009, 08:19 PM

Hi,

I know this isn't a new topic, but I have a question. I inspected my attic and found that the only insulation in the roof rafters is where the vent isn't. I am guessing its about R13. My area calls for R49. Now I am only talking about the area between the knee walls and the upper attic. My plan to increase the insulation by putting up 2x6 or 2x8 on edge perpendicular to the roof trusses over the exsisting drywall. Then insulate the new space and put up new dry wall. Does this sound reasonable?

Thanks,
Dann

**Gary in WA** · 09-05-2009, 10:32 PM

Why perpendicular? I would go in-line, hanging from existing rafters, attached every 2' with a positive connection, not just nails. If you use this, it would take 5-1/2" (2x6): http://www.lowes.com/lowes/lkn?actio...065&lpage=none

If plaster and lath, I would be concerned the extra weight would cause problems in the ceiling below the bearing (knee) walls. Also, don't forget air movement under the space: http://www.homeenergy.org/archive/he...95/950309.html
Be safe, G

remernorth · 09-06-2009, 07:13 AM

I want to go perpendicular so I don't have to take down the exsisting drywall in hopes of keeping the spaces liveable while i work.

**Gary in WA** · 09-06-2009, 01:21 PM

You could use a Simpson H2.5 or H8 at each truss/furring union: http://www.strongtie.com/products/connectors/H.asp
Be safe, G

remernorth · 09-06-2009, 07:54 PM

Thanks G!!

I am greatful for the information.

Dann

**Gary in WA** · 09-06-2009, 08:22 PM

You are welcome! That is why we are here, 'till next time...
Be safe, G