Adding To Existing Insulation - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Display Modes
Old 01-22-2008, 10:23 AM   #1
Join Date: Jan 2008
Posts: 1
Rewards Points: 10

adding to existing insulation

We are adding insulation to the existing in our attic. It is taking multiple layers in which we are criss-crossing as much as possible. I have read that we need to box around electrical and flues. Can any add some insight as to where I get these boxes and extensions for around the flues? I want to do this right so I don't have to do it again. Also, what do I do with faced insulation when I cross over electrical boxes, etc? Some have told me to cut a hole in the insulation so there is a snug fit and others have said to just roll over it. I need lots of help guys! - new gal to insulation


renegade is offline   Reply With Quote
Old 01-22-2008, 11:43 AM   #2
Join Date: Nov 2007
Posts: 948
Rewards Points: 1,274

After the 2nd layer, you're wasting your time and money. R-values are not cumulitive.


LawnGuyLandSparky is offline   Reply With Quote
Old 01-23-2008, 10:46 PM   #3
Join Date: Jan 2008
Posts: 309
Rewards Points: 250

Your first layer of insulation should have the paper vapor barrier facing downward toward your living space. The second should NOT have paper on it. You can buy it that way.

For electrical ceiling boxes with multiple layers of insulation, Cut the insulation on the first layer so that it stops just short of any electrical boxes. For ceiling boxes (lights etc.) as long as they are not generating heat, the second layer can by laid over the top. This will create a small air space around the box. It's really not a problem though unless the boxes are generating heat. Blown insulation usually goes right over them. This goes for water heater vents as well.

The only time you have to leave an electrical fixture uncovered is when you have a recessed lighting fixture that is NOT rated for insulation contact.

The boxes, you'll have to make. Some as simple as old paneling or plywood will work. Get some 1x1's or 1x2 about 12" in length. You'll need these for the corners. Nail the 12" square paneling around it to form a box with the top and bottoms open. Put this over the fixture and voila your good to go. For stove pipes, leave plenty of room around them. Especially keep the paper vapor barrier away from them.
Randell Tarin is offline   Reply With Quote

Thread Tools
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 Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cape Cod Style House Attic/Crawl Space Insulation Help Danielg Insulation 24 05-21-2012 08:20 AM
Adding insulation to a low-slope roof cbeingessner Roofing/Siding 25 09-21-2010 11:01 AM
Adding attic insulation and cutting soffits a DIY job? drh Roofing/Siding 15 12-31-2007 07:47 PM
Is adding insulation in attic cost effective? AllGoNoShow Building & Construction 1 12-05-2006 11:31 AM
Adding onto an existing garage awayne Building & Construction 2 06-04-2006 09:16 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1