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We want to optimally insulate our attic, especially since it has our main HVAC supply ducts in it.

by LiveModern Webmaster last modified Feb 06, 2013 01:08 AM
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by last modified Feb 04, 2013

We live in Northern Kentucky and have an older 1.5 story cape cod style home that we built onto the back with a shed style roof. It is ventilated, from the eaves, up into the side attic behind the 2nd floor knee walls, up into the attic and then out. It has a metal roof with good underlayment. In the addition our roof slope is 3/12, with 2x6 roof rafters, and the area is packed with the new main HVAC ducting. The existing house has 9.5' celings and the addition only has 8' celings. We want to optimally insulate this area, especially since it has our main HVAC supply ducts in it. But between the limited space and the HVAC ducts our space is limited. Can we attached rigid foam insulation board under the roof rafters creating a ventilation path up into the side attic, and then fill the area under the rigid foam down to the ceiling with blown insulation? Could we also pressure fit say 2" to 4" of rigid foam between the rafters, then place say 1" sheet under the




 

 

We live in Northern Kentucky and have an older 1.5 story cape cod style home that we built onto the back with a shed style roof. It is ventilated, from the eaves, up into the side attic behind the 2nd floor knee walls, up into the attic and then out. It has a metal roof with good underlayment. In the addition our roof slope is 3/12, with 2x6 roof rafters, and the area is packed with the new main HVAC ducting. The existing house has 9.5' celings and the addition only has 8' celings. We want to optimally insulate this area, especially since it has our main HVAC supply ducts in it. But between the limited space and the HVAC ducts our space is limited. Can we attached rigid foam insulation board under the roof rafters creating a ventilation path up into the side attic, and then fill the area under the rigid foam down to the ceiling with blown insulation? Could we also pressure fit say 2" to 4" of rigid foam between the rafters, then place say 1" sheet under the

First thing I would research: do I want a cold attic or a warm attic where my duct-work is located. I do not believe the foam board would be the...


 

 

 
 
 

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