DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Insulation and Radiant Barriers > Cellulose Insulation Questions




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 04-07-2014, 10:49 PM  
rololow
Junior Member
 
Join Date: Apr 2014
Posts: 6
Liked 1 Times on 1 Posts
Likes Given: 1

Default Cellulose Insulation Questions

Hi, I'm new to the forum and home owning. I live in the Seattle area and want to add insulation into my house. I'm a DIY. And prefer to try to save money where I can and pay the contractors for the hard stuff. My attic currently has a form of cellulose in it that is very uneven through out. The estimate I received said that my insulation is anywhere from an R-11 to R-19 and I would like to bring it up to a R-39.

I've done a lot of research about installing blown in cellulose. Per the articles and instructions, they said to install baffles to help with the air flow. I already did this. Pretty much everything I've read says that I should be able to see light come up through the baffles. The one's I purchased were about 48 inches long. I can't see any light through them. I even had someone hold a flashlight up to the vent outside the house to see and still nothing. I installed the baffles against the eves of the rafters against the wood where the three holed vents are. Did I not properly install them??

Secondly, is there a "limit" to the amount of cellulose insulation someone can blow in? From the calculations I've done for the square footage of my house, I will need to add 30-35 more bags of cellulose to bring my R value up to 39. This seems like a lot. I just want to make sure that I don't add too much insulation and cause my attic to have an airflow/ventilation problem.

Any help is greatly appreciated!

Thank you!



__________________

Last edited by rololow; 04-07-2014 at 10:54 PM.
rololow is offline  
 
Reply With Quote Quick reply to this message
Old 04-07-2014, 11:13 PM  
nealtw
Contractor
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,681
Liked 788 Times on 703 Posts
Likes Given: 1349

Default

Welcome to the site.
The baffle should be installed against the roof sheeting to extend just past the extrior wall and the rest of the gap filled with batt insulation which will stop the loose insulation from falling into the soffet area.
I installed the baffles against the eves of the rafters against the wood where the three holed vents are. Did I not properly install them??
I can immagine a few places where you could have wood with three holed vents, can you explain that better?



__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 04-07-2014, 11:30 PM  
rololow
Junior Member
 
Join Date: Apr 2014
Posts: 6
Liked 1 Times on 1 Posts
Likes Given: 1

Default

Lol, I'm sure that would help!

If I remember correctly I have 15 different rafter sections that have bird blocks. I bought plastic black baffles and stapled them to the roof sheeting. Similar to what this gentleman does in this video.


I had to remove the old cardboard baffles, to install the new plastic ones. There was already blown in insulation under the old cardboard baffles. I was able to completely see the bird blocks while installing the baffles, and after install there is no visual of them.
__________________
rololow is offline  
 
Reply With Quote Quick reply to this message
Old 04-08-2014, 12:06 AM  
nealtw
Contractor
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,681
Liked 788 Times on 703 Posts
Likes Given: 1349

Default

In you video it is not clear that the soffet area outside the wall is clear of insulation and his soffet is plugged no air movement is possible.
OK I understand birdblocks, nothing easier here. You should find a way to clear the area of insulation do a partial cut on the baffle so you can bend it down to include a space over the three holes. Then staple into place and back that up with a peice of batt insulation which will stop the loose insulation from plugging everything up.
BTW. Don't forget to raise the sides of the attic access before adding more insulation.

berger-accuvent.jpg  
__________________
nealtw is offline  
 
Reply With Quote Quick reply to this message
Old 04-08-2014, 07:50 AM  
beachguy005
Senior Member
 
Join Date: Sep 2012
Posts: 159
Liked 43 Times on 39 Posts

Default

Look here for recommended R values. Your zone is up to R60 for an uninsulated and adding up to R38 in an attic with some existing insulation.

http://www.energystar.gov/?c=home_sealing.hm_improvement_insulation_table

I'll also mention you should check with your utility company for any rebate money or other programs.

The other issue you should consider is attic access after you add 18 inches of cellulose. It looks nice and even with great coverage but if you have to go up there to do some work, add a circuit or find some wiring...it's a nightmare.

I had it done and I wished I had used fiberglas batt insulation.

__________________
beachguy005 is offline  
 
Reply With Quote Quick reply to this message
Old 04-08-2014, 10:37 AM  
rololow
Junior Member
 
Join Date: Apr 2014
Posts: 6
Liked 1 Times on 1 Posts
Likes Given: 1

Default

@Nealtw: Thank you for the picture that was exactly what I was wondering about! Looks like I will be redoing the baffles.

@beachguy005 great link! Thanks!

__________________
rololow is offline  
nealtw Likes This 
Reply With Quote Quick reply to this message
Old 04-08-2014, 11:07 AM  
nealtw
Contractor
 
Join Date: Nov 2010
Location: vancouver, b.c.
Posts: 9,681
Liked 788 Times on 703 Posts
Likes Given: 1349

Default

BTW, congrats on the first house. For the day you may want to sell the house, you should start a book of pictures, receipts and explanations of repairs that you do.



__________________
nealtw is offline  
rololow Likes This 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Cellulose insulation in basement ceiling diynewf Insulation and Radiant Barriers 4 04-03-2014 01:30 PM
Best way to remove old cellulose insulation? Jungle Insulation and Radiant Barriers 3 01-28-2014 05:41 PM
Knob & Tube -- Cellulose Insulation? rlowe82 Electrical and Wiring 10 11-04-2011 11:50 AM
Blown in cellulose insulation LISAinTN Insulation and Radiant Barriers 14 04-13-2011 10:49 AM
Blown in Cellulose Insulation watersda Insulation and Radiant Barriers 13 01-15-2011 07:17 AM