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-   -   insulating non accessible attic (http://www.diychatroom.com/f103/insulating-non-accessible-attic-122554/)

ratherbefishing 11-06-2011 12:37 PM

insulating non accessible attic
 
I will soon be installing insulation in my new bathroom addition. 80 sq ft. The roof pitch is very shallow; 2.5 in 12. Soffit vents and a 10" round roof vent. Height at the ridge is only 1' above the 2x8 ceiling joists. So the attic will be inaccessable after the sheetrock is installed. All the wiring is above the joists, due to lack of access below. No junction boxes, tho. IC, airtight recessed lighting. What's the easiest way to install adequate insulation? I'm thinking fiberglass batts and support rods like these: http://www.soundaway.com/IS16_Insula...rt_p/22009.htm, before the sheetrock is installed.

Any better/easier solutions? Or am I missing something?

OhmZoned 11-06-2011 07:56 PM

Quote:

Originally Posted by ratherbefishing (Post 765087)
I will soon be installing insulation in my new bathroom addition. 80 sq ft. The roof pitch is very shallow; 2.5 in 12. Soffit vents and a 10" round roof vent. Height at the ridge is only 1' above the 2x8 ceiling joists. So the attic will be inaccessable. All the wiring is above the joists, due to lack of access below. No junction boxes, tho. IC, airtight recessed lighting. What's the easiest way to install adequate insulation? I'm thinking fiberglass batts and support rods like these: http://www.soundaway.com/IS16_Insula...rt_p/22009.htm, before the sheetrock is installed.

Any better/easier solutions? Or am I missing something?

Hi there - I am in the same predicament it would seem. Here is my attic (link)

I also do not have IC rated lights ...yet! Once I get everything air sealed and prepped, I am going to use blown in Atticat insulation in the entire place (up to 20" @ r-61). I will even be blowing the insulation on top of an old roof which has been closed in by a newer roof.

I would be curious what your research shows as well.

Ohm
:thumbup1:

ratherbefishing 11-11-2011 06:14 PM

Don't seem to be getting any replies. Hmmm.
What is the best, easiest, most cost effective way to insulate an attic that will be inaccessible once the sheetrock is installed?

oh'mike 11-11-2011 06:24 PM

Rather B---This is the first time I've seen this post---An I don't miss much---

Someone will help,soon.---Mike---

Gary in WA 11-12-2011 07:46 PM

OZ, sounds as if you need to start a new thread in "Electrical" for those questions. Insulating on top of the existing old roof would be wasteful unless the space below is fully insulated. Any air gap between roof framing/insulation below would not help/work. No atticat: post #18- here: http://www.diychatroom.com/f103/atti...122303/index2/ follow the link I gave.


RB, have you looked in to conditioned attics?
http://www.buildingscience.com/docum...rchterm=attic+


Gary

OhmZoned 11-13-2011 09:30 AM

Quote:

Originally Posted by GBR in WA (Post 769748)
OZ, sounds as if you need to start a new thread in "Electrical" for those questions. Insulating on top of the existing old roof would be wasteful unless the space below is fully insulated. Any air gap between roof framing/insulation below would not help/work. No atticat: post #18- here: http://www.diychatroom.com/f103/atti...122303/index2/ follow the link I gave.

Gary

I have replied\updated my original attic insulation post based on this very helpful information.

Here is a link to my original post: Help with complicated insulation project in attic.

ratherbefishing 11-13-2011 09:46 AM

It appears I did not do my own research before asking the question. I had previously only installed insulation under floors. I now see that in a ceiling installation, the facing has a staple flange that will hold the insulation up until the drywall is installed.

Windows on Wash 11-14-2011 09:46 AM

Quote:

Originally Posted by ratherbefishing (Post 765087)
I will soon be installing insulation in my new bathroom addition. 80 sq ft. The roof pitch is very shallow; 2.5 in 12. Soffit vents and a 10" round roof vent. Height at the ridge is only 1' above the 2x8 ceiling joists. So the attic will be inaccessable after the sheetrock is installed. All the wiring is above the joists, due to lack of access below. No junction boxes, tho. IC, airtight recessed lighting. What's the easiest way to install adequate insulation? I'm thinking fiberglass batts and support rods like these: http://www.soundaway.com/IS16_Insula...rt_p/22009.htm, before the sheetrock is installed.

Any better/easier solutions? Or am I missing something?

Easiest way would be to make sure you have vent chutes at the eaves and blow in cellulose.

ratherbefishing 11-14-2011 03:01 PM

Windows,
By vent chutes, do you mean the baffles that attach to the underside of the roof decking, to prevent the insulation from blocking the soffit vents and allow air in, or an opening to blow in the insulation? I have installed the former.

Or are you suggesting that I install almost all of the ceiling, then blow in cellulose, then add the last piece of sheetrock? I was not planning on having any access hatch, since the ridge is so low.

Thanks!


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