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Finishing bonus room - insulation question
Posted on 10/2/19 at 5:00 pm
Posted on 10/2/19 at 5:00 pm
I'm beginning the process of finishing about 800 sq ft upstairs between two rooms. One room is already insulated and ready for sheetrock, but the room above my garage needs everything.
My question is, if I am using the rafters (2x6's) as my ceilings...do I need to run baffles all the way up to open air before I insulate? I was going to roll batt R19 up there or is there a better method. Kind of scared of energy costs with adding a second AC unit and underinsulating
Pic for reference...
My question is, if I am using the rafters (2x6's) as my ceilings...do I need to run baffles all the way up to open air before I insulate? I was going to roll batt R19 up there or is there a better method. Kind of scared of energy costs with adding a second AC unit and underinsulating
Pic for reference...
This post was edited on 10/2/19 at 5:03 pm
Posted on 10/2/19 at 5:23 pm to SportTiger1
That room will be hot with bat. Look into spray foaming the ceiling
Posted on 10/2/19 at 5:34 pm to wickowick
Even with spray, is baffling necessary for venting the attic?
Posted on 10/2/19 at 6:05 pm to SportTiger1
No venting with spray foam
Posted on 10/2/19 at 7:04 pm to SportTiger1
Is there a ridge vent? How is that attic ventilated?
I put batt in my bonus room with a mini split and haven’t had any issues. No baffles, but I’m open on each end to attic space and have a ridge vent.
I put batt in my bonus room with a mini split and haven’t had any issues. No baffles, but I’m open on each end to attic space and have a ridge vent.
Posted on 10/2/19 at 9:28 pm to LSUtigerME
Vents on the eves and those roof top spinners...no ridge vents to my knowledge
Wick, am I looking for closed or open cell for spraying the sheathing?
Wick, am I looking for closed or open cell for spraying the sheathing?
This post was edited on 10/2/19 at 9:29 pm
Posted on 10/3/19 at 4:25 am to SportTiger1
You need to contact your exterminator to see if he will honor a termite bond before you use spray insulation.
Also, I’ve seen mold issues when some parts of the house are different temps. Mainly a foamed area that stays much cooler pulling hot air in from other parts.
It works great and we use it all the time but that something you need to think about
You probably should just install a ridge vent and use r-19.
Also, I’ve seen mold issues when some parts of the house are different temps. Mainly a foamed area that stays much cooler pulling hot air in from other parts.
It works great and we use it all the time but that something you need to think about
You probably should just install a ridge vent and use r-19.
Posted on 10/4/19 at 9:33 pm to SportTiger1
It could just be the picture, but those rafters look bigger than 2x6 (in comparison to the 2x4 collar bracing and other framing). If 2x8's you could go up to r30 batts with the baffles assuming you have soffit vents and ridge venting. If 2x6's then do the r19 with baffles. DO NOT spray foam in your rafters AND try to vent your attic. When foaming, you are trying to create a yeti icechest out of your home. You need a different type of HVAC system that dehumidifies the air in the home, only allows for minimal introduction of outside air, and allows for certain air (gas from heating) to escape. You can cause way more problems than it is worth if you don't account for all of these variables and then some. What happens when you close an ice chest with just a little bit of heat and moisture in it and no way for it to escape? After a few weeks it is full of mildew. Venting an attic space with foam (in our climate) just introduces humid air to an area that it cannot escape from.
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