--172.59.xx.xx

I'd also call an insulation company and get a price from them to do it as they will have equipment,ladders, etc to do it all quickly. Plus they have the knowledge of what works best in your area. --75.7.xx.xx

In addition to insulation, you need to be concerned with air sealing and this is covered in what I suggested above. It's like you can have a thick winter jacket, but if everything is not zippered and buttoned up, all the insulation won't help. --173.63.xxx.xx

I follow Richard's idea of tearout the mess, not much benefit with this, add roof ventilation baffles - they are formed shapes that allow air passage under the roof deck to ventilate the underside of the roof deck so the plywood does not delaminate during the heat/cool cycles that go above and below the dew point weekly or daily. you may be able to rake the loose stuff together and repurpose it in another location - small snow shovels help get this into cheap trash can liners - these can be stapled into stud cavities elsewhere, the bags make good vapor barriers as well as staple ears, or if you have access to a loose fill blower machine pour these bags in mixing 50 percent with cellulose to handle the insect kill, former general manager of insulation company in the Cleveland Ohio area, I am also the person trying to Organize the Greater Cleveland landlord group, worked for the REIANO group about 15 years before the untimely passing of Shannon and Mary lLou Best who with Vina Cox Jones created the Ohio RIA that broke into groups you see wiggling around the area today. --184.59.xxx.xx

Thanks for the comments. I do not see any soffit vents. I am thinking of hiring that out as I do not like going that high up on a ladder. --172.59.xx.xx

Are the rafter bays above that 3rd floor living space also stuffed with insulation? How are you planning to deal with that? --107.141.xx.xxx

So, perhaps the place for intake venting of attic cut be higher on the roof than the soffit? Though, OHLL, a new roof might be needed to get that vent in there, so might not be best option right now. --72.135.xxx.xx

For the portion of the third floor walls that follows the rafters maybe I need to put in styrofoam baffles and make sure there is no insulation within the baffles. --172.59.xx.xx

The most important with insulation is to be completely air tight ;where in the house with fiber glass insulation there is mold in the insulation. Spray foam is air tight along with does not deteriorate like fiber glass insulation. Can buy a two can of DIY spray foam kits at most building supply stores where will need hazmat suite, face mask, safety glasses and gloves. If want more information then view some videos on You tube on how to DIY spray foam kits. Remove all the old insulation then can fill in the spaces. Attic or upper floors will always have the greatest heat loss then walls. --207.236.xxx.xxx

OH-LL poster you mentioned being near the Cleveland Ohio area, I wanted to mention the Greater Cleveland landlord group meets this Wednesday for dinner at Kumo Grill 1975 Snow Rd at 530 with a discussion to follow on treating interior and yard insects, hopefully getting news on the 2024 maintenance forms requirement handed down by building and housing court, last month we learned the lead clearance test and point of sale inspection has been suspended temporarily - took 4 years for us to get someone from the city to attend our meeting and share info with us. The fancy buffet cost 23bux plus drinks however they have a menu of entrees in the 10-12 range which many attendees enjoy while networking - there is a 5bux donation to the organizers of this event, handouts as usual., rear meeting room. If you talk with anothe member I have re-printed the last handout on the smoking rules tat includes the latest on MJ - new toner in my copier now. --184.59.xxx.xx