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Basement Finishing and Renovations Has it been 2 years already? Time to work on finishing the basement into some extra living space.


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Old 2014-07-03, 01:49 PM
TheGrudge TheGrudge is offline
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Default Basement Insulation Question

In my previous home, I insulated the area above our home theatre room with Roxul Safe n' Sound. It worked wonders for sound-dampening, especially when coupled with resilient channel.

I want to do the same thing in this house, but we have engineered floor joists, and they aren't spaced the standard 16" or 24" as in a typical home. I measured a while ago, and I seem to recall them being 19".

What's the easy play here, buy 24" insulation and cut them all at 19" (leaving me with tons of 24" x 19" pieces), or shave 5" off the width of each one and have some waste?

Also, I thought I heard at some point that you don't want to insulate the entire basement ceiling with Roxul. The reasoning was because you then make it harder for air to move between floors. Am I crazy, or is there any truth to that?

Last edited by TheGrudge; 2014-07-03 at 01:53 PM.
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Old 2014-07-04, 07:50 AM
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good2know good2know is offline
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A cut table , a drywall square, and a roxul knife makes quick work of it. Installing perpendicular to joists will give you a leftover piece you can use in the walls or narrower joists spaces - 24 x 8 mol. An L shaped wood frame jig with the distances marked helps - no measuring

A drywall ceiling and glued plywood/osb floor pretty much eliminates air movement between floors already. That's good for flame spread and smoke movement in case of fire. Do the entire ceiling. If not sound will travel through any open spaces and defeat the purpose of it.

Did you install pots with ''insulation can be tight to it' boxes ?

Last edited by good2know; 2014-07-04 at 08:00 AM.
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Old 2014-07-04, 08:28 AM
TheGrudge TheGrudge is offline
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Yeah, I was thinking a jig would be the way to go. That and a nice big bread knife

Good call on the drywall blocking the air flow anyway.

I haven't bought the pot light cans yet, but I definitely need to make sure they are rated for 'insulation can be tight to them' as it's all going to be inspected. Any reco's on brands or how to make sure they're rated appropriately would be appreciated. I often see the electricians on Holmes on Homes rip out the "homeowner" cans. When asked why, they say "because they're junk".

Okay - so what makes a pot light can junk?
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Old 2014-07-04, 09:58 AM
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Quote:
Originally Posted by TheGrudge View Post
Okay - so what makes a pot light can junk?
Flimsy, loose, fall apart when you go to change the bulb.
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Old 2014-07-04, 10:26 AM
jeffjc jeffjc is offline
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Flimsy, loose, fall apart when you go to change the bulb.
yes, usually the ones you buy in the 10 pack at HD.
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Old 2014-07-04, 06:27 PM
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I used these recently in a fam member's insulated basement ceiling.

http://www.homedepot.ca/product/new-...perture/919254

The general term is 'IC (insulation contact) rated vs non IC rated.
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Old 2014-07-04, 06:38 PM
TheGrudge TheGrudge is offline
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Thanks gtk. I think those are the ones I used in my last house so,I'll likely go that route.

Now I just need to work on numbers and placement. I don't want a dark basement! Also, debating between ceiling tiles and drywall again for the ceiling.
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