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mattlina

08:15AM | 09/25/05
Member Since: 09/24/05
3 lifetime posts
Bvhvac
Hi, I have an unfinished attic with cellulose insulation on the floor. We are about to lay down another layer of fiberglass insulation over that, since it's a little compressed.

All my research shows that all the electrical devices in the ceiling(floor of attic) should be 3" clear of any insulation. However, they are all completely covered with cellulose! Should I clear the cellulose away, or does the 3" rule only apply to fiberglass? The electrical outlets visible in the attic are white plastic. Thanks in advance for any answers?

Mike

Billhart

09:13AM | 09/25/05
Member Since: 04/25/05
1915 lifetime posts
That rule is for can lights that are not rated for insulation contact. If they are rated for contact they are marked IC.

And if you have any old activeknob and tube wiring that should not be covered at all.

Those rule apply reguardless of the type of insulation and are based on the ability of the electrical equipment to handle the heat.

There are no restriction to cover boxes for ceiling lights and fans.

Insulation manufactures might have additonal limitations.

For celulose the R-value is based on the settled height so measure and see if you want to add mroe.

And I would not add FG, but more celulose.

I have not seen any studies on this, but the R value of FG is measured with it between 2 solid surfaces. I suspect that the effectivemenss is much less when it is open to the air and FG allows air to move through it.


mattlina

10:06AM | 09/25/05
Member Since: 09/24/05
3 lifetime posts
Now all my ceiling lights on the top floor are below the level of the ceiling. So the light is not "in" the attic. Furthermore, I put in small flourescent lights instead of incandescent lights to save energy. Since they don't give off as much heat, I assume I do not have to make space around the cellulose?

Also, any explanation as to why to choose cellulose over FG? It seems is would be easier to roll it out?
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