Insulation For Real 2in X 8in Floor Joists (old House) - Insulation - DIY Chatroom Home Improvement Forum
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Old 01-11-2018, 01:26 PM   #1
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Hey guys I need to insulate the floor joists under my kitchen which is the basement ceiling. The ceiling is not finished so access is not a problem. I am just looking for the correct insulation for it.

I checked around and it seems that the R25 would be ok as it is 8inches thick but I am wondering if the R19 which is 6.25 inches thick would be ok as well since its slightly cheaper. Or if you guys can recommend something better I am all ears.

Also wondering about getting faced vs unfaced for the basement.

Thanks
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Old 01-11-2018, 01:49 PM   #2
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Re: Insulation for real 2in x 8in floor joists (old house)


Heat rises so feeling a difference on the floor is minimal. So if you do the r 19 you will always wonder if you should have done more.
paper face is a vapour barrier and the floor sheeting is considered a barrier so non faced is fine.
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Old 01-11-2018, 02:22 PM   #3
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Re: Insulation for real 2in x 8in floor joists (old house)


Is the basement heated or otherwise maintaining a reasonable temperature? In many basements they get heat from the heat ducts, pipes, and furnace/boiler so stay well above freezing. If the basement is reasonably "not cold" then adding insulation to the ceiling will do almost nothing.

Cold floors are a common problem but the solution is to put the heat down there. What type of heating do you have, forced hor air or baseboard hot water?

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Old 01-11-2018, 02:40 PM   #4
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I have steam radiator heating but no radiators in the basement.

Also the basement is completed unfinished the part of the basement is right next to bilco doors which have a lot of drafts.
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Old 01-11-2018, 03:11 PM   #5
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Re: Insulation for real 2in x 8in floor joists (old house)


Check the pricing per square foot for R12 and use it doubled up. Stagger the seams.
Versus R28 for 8 inch deep joists.
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Old 01-11-2018, 03:18 PM   #6
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Re: Insulation for real 2in x 8in floor joists (old house)


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I have steam radiator heating but no radiators in the basement.

Also the basement is completed unfinished the part of the basement is right next to bilco doors which have a lot of drafts.
Then build an insulated door at the bottom of the stairs to the bilco doors.
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Old 01-11-2018, 03:25 PM   #7
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Good point. And I suppose caulking around the bilco doors won't hurt either.
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Old 01-11-2018, 03:40 PM   #8
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Hi do you mean R13? I see that they are both 3.5in thick but R13 is more readily available then R12.
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Old 01-11-2018, 03:40 PM   #9
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Re: Insulation for real 2in x 8in floor joists (old house)


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Good point. And I suppose caulking around the bilco doors won't hurt either.
Stopping drafts is always a good idea. With out heating the basement or the floor you seldom really get to comfort.
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Old 01-11-2018, 03:43 PM   #10
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Good point. And I suppose caulking around the bilco doors won't hurt either.
Stopping drafts is always a good idea. With out heating the basement or the floor you seldom really get to comfort.
With the heating system that I have now is there an easy way to heat the basement or am I looking at a costly project?
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Old 01-11-2018, 03:47 PM   #11
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Re: Insulation for real 2in x 8in floor joists (old house)


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With the heating system that I have now is there an easy way to heat the basement or am I looking at a costly project?
Post a question in HVAC with some info about your system. I don't think I have seen a steam system except the one that heated my first school.
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Old 01-11-2018, 03:48 PM   #12
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Re: Insulation for real 2in x 8in floor joists (old house)


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Then build an insulated door at the bottom of the stairs to the bilco doors.
Can the insulated door be built to seal off the bilco door area with a guaranteed 100 percent seal from the remainder of the basement? If not, when air from the basement area reaches the frigid bilco area expect possible condensation and mold.
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Old 01-11-2018, 03:53 PM   #13
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Re: Insulation for real 2in x 8in floor joists (old house)


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Can the insulated door be built to seal off the bilco door area with a guaranteed 100 percent seal from the remainder of the basement? If not, when air from the basement area reaches the frigid bilco area expect possible condensation and mold.
You lost me. I would consider the bilco door area to be the same as any drafty front porch out side the home.
You are worried about warm moist air getting to a cold area. That is what they have now.
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Old 01-11-2018, 03:55 PM   #14
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Then build an insulated door at the bottom of the stairs to the bilco doors.
Can the insulated door be built to seal off the bilco door area with a guaranteed 100 percent seal from the remainder of the basement? If not, when air from the basement area reaches the frigid bilco area expect possible condensation and mold.
Would keeping the humidity before 50% using a dehumidifier help avoid this?
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Old 01-11-2018, 04:08 PM   #15
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Re: Insulation for real 2in x 8in floor joists (old house)


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Would keeping the humidity before 50% using a dehumidifier help avoid this?
Newer houses with all the bells and whistles can still have a moisture issue in the basement. You never mentioned a moisture problem and if it is not a problem, don't go down rabbit holes.

So one other thought . If you have a boiler in the basement, you likely have a lot of radiant heat just coming off that. If you stopped all the drafts and added insulation to the exterior, that radiant heat would get to the floor.
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