Author Topic: Insulation of attic - Roxul or Cellulose? Sill Plate?  (Read 8040 times)

MrSal

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #50 on: May 02, 2018, 03:35:49 PM »
Nice! We also insulated our attic last fall and enjoyed it through the winter but we don't have AC so I'm really hoping it performs in the summer.

So far I am very happy. Yesterday was 85F and today is 89F ... just got home and the house sits at a very nice 70F !!!

I want to see how it performs during the actual summer.... but so far it seems very promising! At this pace, I dont think we will need much AC ... and our walls are not even that well insulated I think...
« Last Edit: May 02, 2018, 03:39:03 PM by MrSal »

MrSal

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #51 on: June 16, 2018, 12:50:45 PM »
Update... its been higher 80s the past 5 days or so ... tomorrow again 89 and the next day is 95 ...

I have rarely used AC so far this year - total about 2 hours and because my wife is picky at times :D ...

Right now the house is sitting at 73F and last time we used AC was more than 2 weeks ago.

However, I do have an Airking which I have been trying... at end of day during a hot day, especially if it's a stretch of hot days, the house may get to 76-77F around 7-8PM ... usually we a couple windows and turn it on. In 30 minutes or so the temperature goes from 76F to 71 inside. The fan is a great way to "reset" the temperature everyday for the heat the next day.

A thing I have noticed today though, is most likely the performance will increase even more. The sill plate is not yet insulated, and while my house sits at 73F The first 2 feet of flooring next to the exterior walls are at 79F or so... probably a lot of leakage coming from the sill plate.

Since we are finishing the basement, this area will be one of the first to tackle.

MrSal

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #52 on: June 18, 2018, 11:52:53 AM »
96F air temperature at overcast ... under the sun is probably 100+ ... sidewalks are at 120F

Obviously, there are no miracles with this type of heat considering mostly that our walls I doubt there's much insulation there and being leaky I am sure ... currently the house sits at 79F and haven;t used the AC.

I wasn't able to use the Airking fan last night because the low during the night was only 74F, so the house wasn't able to get that low with the fan... luckily these hot muggy nights are not the norm... tomorrow the low temps at night go back to high 50s/low 60s

Pennycounter

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #53 on: June 19, 2018, 10:27:36 AM »
Awesome update! We are loving our insulation as well but the results are noticeable but not as great. The back of the house is direct West facing and the windows have no low-e and since we have a large patio, there is not much shade.  Either way its better than last summer and we don't have AC! 

Sun Hat

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #54 on: June 20, 2018, 06:43:54 AM »
I insulated both my walls and attic with cellulose this past winter and can really notice the difference. My furnace ran much less over the winter, despite it being very cold outside. Now that it's quite hot out, the indoor temperature increases about 2-3C over the course of a day with a 15C differential to outside, which is quite a bit better than before. I run the fan and AC for the sake of my my fluffy dog, who enjoys draping himself over the cold air vents.


MrSal

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #55 on: July 13, 2018, 11:35:24 AM »
For those that never insulated and lack insulation in their attic... DO IT!

It's ridiculous... just got my 2nd report...

June I have used a total of 18 hours of AC - we had a lot of muggy days where even at night we couldn't open the windows and temperatures in the high 90s low 100s.

Total CDDs for June this year is in the 320s while last year it was in the 280s (so in essence this summer has been about 14% hotter) ...

Even then, we have used 18 hours of energy vs 46 hours last year!

Last year, during high 90s days or something, the house would easily climb into the 80s sometime in the afternoon... right now, at end of day around 6PM-7PM once the sun starts hitting the west side windows, and during the high 90s days... then yes our house hits the 78-79F range ... but during the day the AC rarely kicks on.

It went from an average of 1.5 hours daily to 35 minutes a day of AC usage!

For the past 60 days we have used 25 hours of AC vs 61 hours of AC last year.

zoochadookdook

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #56 on: July 16, 2018, 07:51:25 AM »
This looks like quite a job;

I'm getting my insulation done this month (did my roof last year DIY and after ice damming in the winter and it being hot in the summer just about had it with ventilation and soffits).  Going with a smaller local family owned company with a good rep.

I believe the quote for insulation r49 blown in top and front attics/baffles front/rear and interconnection (cape cod style with a front and top attic), a radiant barrier in the front, a ton of can vents, a upstairs bathroom fan vent and exhaust, and 12 new soffit vents is $1500. Rebates and such from the energy company and taxes will bring it to about 1250. If paid in cash (can be split into 3 payments) they'll knock 5% off. I could go r61 for another 150 or so which i'm considering (live in Michigan).
 
This seems way more reasonable than the "big company quotes I had for 3k or so; otherwise I would be DIY'ing.

On that note does anyone have experience insulating basements? I framed my basement 1/4" off my wall, ran the electrical and then realized the way to do it was to use that foam board and frame onto that. (I'm 25, a youtube builder on the weekends, database student during the week so by no means am I a professional). I've heard batts will mold due to moisture through the foundation. Is there any sort of "bagged batt" or something similar or should I look at cuttings foam inserts/spray in foam (pricey) as my options? This has to happen before I can start the drywall and flooring....of course I still have to get the plumbing for the bathroom figured out.

Thanks!

MrSal

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #57 on: July 16, 2018, 01:16:38 PM »
This looks like quite a job;

I'm getting my insulation done this month (did my roof last year DIY and after ice damming in the winter and it being hot in the summer just about had it with ventilation and soffits).  Going with a smaller local family owned company with a good rep.

I believe the quote for insulation r49 blown in top and front attics/baffles front/rear and interconnection (cape cod style with a front and top attic), a radiant barrier in the front, a ton of can vents, a upstairs bathroom fan vent and exhaust, and 12 new soffit vents is $1500. Rebates and such from the energy company and taxes will bring it to about 1250. If paid in cash (can be split into 3 payments) they'll knock 5% off. I could go r61 for another 150 or so which i'm considering (live in Michigan).
 
This seems way more reasonable than the "big company quotes I had for 3k or so; otherwise I would be DIY'ing.

On that note does anyone have experience insulating basements? I framed my basement 1/4" off my wall, ran the electrical and then realized the way to do it was to use that foam board and frame onto that. (I'm 25, a youtube builder on the weekends, database student during the week so by no means am I a professional). I've heard batts will mold due to moisture through the foundation. Is there any sort of "bagged batt" or something similar or should I look at cuttings foam inserts/spray in foam (pricey) as my options? This has to happen before I can start the drywall and flooring....of course I still have to get the plumbing for the bathroom figured out.

Thanks!

I am currently insulating my basement:



2 inch XPS glued against the wall ... also XPS on sill plate .... taped with a good european tape and also some foam can... and sealed on ground and top with more foam...

Starting now the build with metal studs and running electrical


Scour craigslist for deals on foamboard... there are plenty around ... i got this on CL for maybe 60% off retail price. They were used but as you can see pretty good condition.

zoochadookdook

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #58 on: July 16, 2018, 01:20:01 PM »
Yep that's the way I SHOULD have; unfortunately all my exterior framing is done by now

DoNorth

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #59 on: July 17, 2018, 07:46:39 AM »
I used 2x6 $-22 Roxul bats through my whole house (I live in the upper peninsula of Michigan) and pictured framed the cavities with acoustic caulk.  Closed it in with smart vapor barrier.  I used foam in all the rim joists and about 20" of blow in cellulose after I used the federal home energy guidelines for air sealing the attic.  My place is about 2850 sq. ft, and so far my place is one of the coolest along our stretch in the summer and I can heat it for about $1000/winter if using only propane or less if I'm burning mostly wood.

zoochadookdook

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #60 on: July 17, 2018, 10:06:34 AM »
I used 2x6 $-22 Roxul bats through my whole house (I live in the upper peninsula of Michigan) and pictured framed the cavities with acoustic caulk.  Closed it in with smart vapor barrier.  I used foam in all the rim joists and about 20" of blow in cellulose after I used the federal home energy guidelines for air sealing the attic.  My place is about 2850 sq. ft, and so far my place is one of the coolest along our stretch in the summer and I can heat it for about $1000/winter if using only propane or less if I'm burning mostly wood.

I'll look into it; I'm leaving the ceiling unfinished and just spraying it black but my joists are all stuffed with batts right now. Still have to seal where mice were burrowing in against the house -____-. What do you mean by smart vapor barrier vs standard? Roxul is more water resistant? Caulking i'll have to check out as well. I was considering cutting a bunch of foam board down, gluing it in the cavities and spray foaming the gaps


 Hoping when they seal and do all the attic work next week it makes a fairly drastic difference in the bills.

DoNorth

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #61 on: July 17, 2018, 10:16:58 AM »
smart vapor has a membrane that closes it cells in the winter when the humidity is high inside which keeps the humidity from passing through and condensing with cold air that infiltrates the building envelope.  It does the opposite in lower humidity and allows drying if there is wind driven rain etc.

I was going to use standard 6 mil visqueen, but opted for the smart barrier instead and then I bought a higher end air exchanger (HRV) in Canada for about $600.

Foam tends to crack when the building flexes or you have truss lift and therefore pulls apart.  Acoustic caulking is difficult to deal with, but stretches with the movements and keeps a nice seal.  I would buy a mechanical caulking gun and get the big tubes if you decide to use it.  The foam board and spray foam is a good budget friendly insulating technique.  To be clear, I used the smart vapor barrier on the walls, definitely not in the attic.

zoochadookdook

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #62 on: July 17, 2018, 10:22:48 AM »
smart vapor has a membrane that closes it cells in the winter when the humidity is high inside which keeps the humidity from passing through and condensing with cold air that infiltrates the building envelope.  It does the opposite in lower humidity and allows drying if there is wind driven rain etc.

I was going to use standard 6 mil visqueen, but opted for the smart barrier instead and then I bought a higher end air exchanger (HRV) in Canada for about $600.

Foam tends to crack when the building flexes or you have truss lift and therefore pulls apart.  Acoustic caulking is difficult to deal with, but stretches with the movements and keeps a nice seal.  I would buy a mechanical caulking gun and get the big tubes if you decide to use it.  The foam board and spray foam is a good budget friendly insulating technique.  To be clear, I used the smart vapor barrier on the walls, definitely not in the attic.

My attic is getting done next week; I hired out but for the 80ft of baffles/combining the 2 attics from the dormer crawlspace to the top/sofits/vents/bathroom vent/radiant barrier and blown in 49 I didn't consider the price too bad. I mathed out materials to be around 900 for me plus at least 20 hours. With rebates from the energy provider and taxes I should come out to around 1250. 350 is easily worth 20 hours of my life spent crawling in the low pitch and front attic.

The basement on the other hand I would have done foam on the wall and framed off of if I hadn't been in a hurry to frame. The smart barrier is a good point; from what I read the issue with vapor barriers was the trapping of humidity so the fact they have one that opens and closes is pretty awesome. Closed cell would be ideal except $$$$$.

DoNorth

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Re: Insulation of attic - Roxul or Cellulose? Sill Plate?
« Reply #63 on: July 17, 2018, 10:40:50 AM »
yes, I completely agree on the crawling around.  I built my place new and very custom, so while the walls were still open and not ceiling had been installed, i insulated the 2nd floor rim joist, I used trusses with energy heels and once the roof was on, I put baffles down into the soffit, stapled them in, and taped them.  The energy heel plus a cut batt for the rim joist eliminated any windwashing concerns you get with only blown in cellulose or fiberglass and then I just blew the cellulose right up to and over the rim joist cut bat against the energy heel part of the truss.  As long as you don't accidentally blow a bunch of insulation down your baffle, you're fine.  I was quoted about $22000 to do my whole place with closed cell.  AFter a lot of research, Roxul, plus a few foam kits and a lot of meticulous cutting gave me about the same results for just over $2500.