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Old 02-07-2010, 01:44 PM   #16
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Where do you get Roxul insulation in the states? What is the price of Hilti, and why do you recommend that product?
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Old 02-07-2010, 01:55 PM   #17
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I found a local provider of Roxul, very close actually. I cannot find online pricing as of now. I think I will start doing my basement ceiling with this product because it looks like I will be able to take it down if need be for wiring or other future problems. I just want to keep all the heat I can on the first floor. Right now with insulating my ducting in the basement, I would say that the basement is probably low-mid 50's in temp and the first floor is 65.
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Old 02-07-2010, 02:54 PM   #18
 
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I didn't mean Tyvek on basement wall...


I'm going to use Tyvek on the joist ends just above the foundation wall, at the house sill, areas typically not sealed very well. In my home, you can feel the air moving through them.

Yes, there is a big problem with cold basement walls in summer and winter. But concrete in general can also transmit water in both directions, so using a vapor seal is not a good idea. Nor is most wallboard or fiberglass insulation. But that is another story...

Jonathan
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Old 02-07-2010, 04:21 PM   #19
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I've decided to use 2" extruded polystyrene. Does anyone know of a brand and/or type of caulk to use when you seal the gaps. The people at the home centers didn't know what would work with the extruded polystyrene.
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Old 02-07-2010, 05:14 PM   #20
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Quote:
Originally Posted by mferguson0414 View Post
I found a local provider of Roxul, very close actually. I cannot find online pricing as of now. I think I will start doing my basement ceiling with this product because it looks like I will be able to take it down if need be for wiring or other future problems. I just want to keep all the heat I can on the first floor. Right now with insulating my ducting in the basement, I would say that the basement is probably low-mid 50's in temp and the first floor is 65.
I've been using Roxul for years, with good result! it doesn't 'wick' like fibre glass!
If you float a chunk in a bucket of water, it floats for a long time, whereas fibre glass will sink over-night!
It also forms a fire barrier. For this reason, I insulated my entire attached garage with it.

Last edited by Wildie; 02-07-2010 at 05:15 PM. Reason: Poor English
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Old 02-07-2010, 06:40 PM   #21
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I don't know whether or not it was the right thing to do, but I put in multiple layers of 2" XPS with silicon latex caulk. It got pretty tedious at times:
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Old 02-07-2010, 07:23 PM   #22
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Nice work! Just as pretty as the picture: http://www.rd.com/57548/article57548.html

Figure #2: http://www.buildingscience.com/docum...ent-insulation

Don't use EPS, it will hold the water.

Be safe, Gary
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Old 02-07-2010, 07:58 PM   #23
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They weren't all that hard:


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Old 02-07-2010, 09:17 PM   #24
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Just to make sure I understand the abbreviations.

What does EPS and XPS stand for?
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Old 02-07-2010, 09:26 PM   #25
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Velvetfoot, are you going to put anything in the space under the joist and between the two pieces of EPS to seal it off ?
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Old 02-08-2010, 06:06 AM   #26
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VF has pretty much done what I did directly to my rim joist but I also came out about 8 inches from the wall on the underside of the floorboards and even at the contact point where the joist hangs on the sill . I did the entire sill plate at the concrete and windows as Bob mentions. In addition I knotched my R22 Roxul to overlap the sill plate until I determine what I waill use to finish my walls.
Then I added R22 Roxul and topped it off with the original R10 pink.
The advantage for me was future access to my aluminium wiring.
EPS and XPS are brands names for different types of foam board. There is both open breathable and closed cell-airtight which is why I am after more info from Bob.
ANY foam has the potential for Toxic fumes in a fire and our code requires it to be covered with a fire resistant board such as drywall.
I am still debating between options for the wall given our HUGE swing in temperatures and high humidity here between the Great Lakes.

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Old 02-08-2010, 06:16 AM   #27
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Roxul


Roxul is a Canadian product and can be found at some US home building centers in major centers near the border. As Wildie noted , it has been around for years, nice to work with if you go that route...not itchy, doesn't sag or wick, cuts clean and staright with a bread knife or serrated rock wool cutter,
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Old 02-08-2010, 06:49 AM   #28
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Chemist, you said Roxul doesn't sag. So when I put it up in the ceiling of my mom's basement, I won't need to put straps underneath it to hold it in? It's an old, damp farmhouse basement and will never be drywalled.

Thanks for all the useful information you've given about Roxul! It sure is helpful.

Barb
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Old 02-08-2010, 06:56 AM   #29
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With overhead installation I would recommend using the spring insulation rods to prevent gravity eventually taking over. Roxul does not sag is often referring to in wall cavity settling that is an issue with other types of batt insulation.
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Old 02-08-2010, 06:59 AM   #30
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Thank you.

Barb
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