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Need some opinions – which I know I’ll get. Like noses – everyone has one, some are just uglier than others.
Building a house w/ gambrell roof. Have decided that wet blown celulose is the way to go. Have three opinions as to how to do it. One from a respected RPE with nothing to sell me nor no axe to grind and two others from cellulose installers. Havwe a fourth, my own, which is confused.
RPE says to blow cellulose between rafters from plate to plate- all the way over the ridge. It will ensure the best insulation for the air handling ductwork which is all in the attic area. The duct work is wrapped w/ foil covered FG, R-8, supposedly. With 2X8 rafters, installers say I’ll get R-20, or thereabouts. I’ve read enough of the threads in here to know I have to go around and seal every crack and pinhole in walls and ceiling to keep air from infiltrating in or out of living space.
First installer also said that was the way to go.
Second installer says tht is way to go, also.
This will close off the only path for ventilation from the soffit continuous vent up over the walls and on to the continuous ridge vent. Have a built in gable end vent in one end that can be used to get air out of attic. Other end of attic is also a gambrell. Will have to provide inlet for fresh air.
I want to blow in cellulose in between ceiling joists, also to take advantage of their 12″ depth and get an effective R-40 in living space. First installer nodded and grunted at that thought. Second installer said he wouldn’t do it, because attic might develop “Hot Spot” if ventilating fan failed. But, if roof is insulated, shouldn’t attic stay cooler? Also – we rely on a lot of systems in house that are not backed up, and failure can cause discomfort/damage.
For fresh air inlet, coupled w/ a fan on the gable end vent, I’m considering leaving the ridge vent open so air from the hottest part of the volume can be drawn out. First installer said not to do that, and gave a reason that doesn’t pass my common sense test.
I’ve liked the discussions by the second installer, since they have all passed the commonsense tests on all other subjects.
Need help so I can make a decision. You-all have convinced me on the superiority of wet blown cellulose. Now bail me out here.
Thanks
Don Reinhard
Replies
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Need some opinions - which I know I'll get. Like noses - everyone has one, some are just uglier than others.
Building a house w/ gambrell roof. Have decided that wet blown celulose is the way to go. Have three opinions as to how to do it. One from a respected RPE with nothing to sell me nor no axe to grind and two others from cellulose installers. Havwe a fourth, my own, which is confused.
RPE says to blow cellulose between rafters from plate to plate- all the way over the ridge. It will ensure the best insulation for the air handling ductwork which is all in the attic area. The duct work is wrapped w/ foil covered FG, R-8, supposedly. With 2X8 rafters, installers say I'll get R-20, or thereabouts. I've read enough of the threads in here to know I have to go around and seal every crack and pinhole in walls and ceiling to keep air from infiltrating in or out of living space.
First installer also said that was the way to go.
Second installer says tht is way to go, also.
This will close off the only path for ventilation from the soffit continuous vent up over the walls and on to the continuous ridge vent. Have a built in gable end vent in one end that can be used to get air out of attic. Other end of attic is also a gambrell. Will have to provide inlet for fresh air.
I want to blow in cellulose in between ceiling joists, also to take advantage of their 12" depth and get an effective R-40 in living space. First installer nodded and grunted at that thought. Second installer said he wouldn't do it, because attic might develop "Hot Spot" if ventilating fan failed. But, if roof is insulated, shouldn't attic stay cooler? Also - we rely on a lot of systems in house that are not backed up, and failure can cause discomfort/damage.
For fresh air inlet, coupled w/ a fan on the gable end vent, I'm considering leaving the ridge vent open so air from the hottest part of the volume can be drawn out. First installer said not to do that, and gave a reason that doesn't pass my common sense test.
I've liked the discussions by the second installer, since they have all passed the commonsense tests on all other subjects.
Need help so I can make a decision. You-all have convinced me on the superiority of wet blown cellulose. Now bail me out here.
Thanks
Don Reinhard