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Blown In Walls With Rental Machine

 
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Old 12-03-2015, 08:08 PM   #1
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Blown In Walls With Rental Machine


I want 20 bays insulated on my garage. Hard to get a good deal from a sub on such a tiny job, and I don't have any good relationship with an insulation contractor since I generally do a few batts myself on the walls I open.

Even though the pressure isn't sufficient and it's not designed for it, I wonder if I can get decent results with the little Home Depot atticat machine, which basically shoots L77. I don't even care if it settles a little. The heat loss already isn't terrible through the uninsulated wall. Fiberglass isn't nearly as bad as cellulose.

Any tips?
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Old 12-03-2015, 08:28 PM   #2
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Re: Blown In Walls With Rental Machine


According to OC, it IS possible with the little rental machine. I had no idea. Now to invent my tapered drywall plug hole saw.

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Old 12-03-2015, 08:35 PM   #3
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Re: Blown In Walls With Rental Machine


The HD near me has the machine for cellulose, they have a different nozzle for use on walls.

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Old 12-03-2015, 09:15 PM   #4
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Re: Blown In Walls With Rental Machine


You need between 2.8 to 4psi to do a decent job. Fact is, unless you run tubing up the wall, you are sure to end up with a poor job (voids in the wall).


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Old 12-04-2015, 09:32 AM   #5
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Re: Blown In Walls With Rental Machine


Just got to add - by the time you pick up the rental machine, fabricate the tube, blow the product in & return it - you are probably already paying more than you would to have someone else do it (assuming you value your time)

As for the tube mentioned above - in some cases it isn't necessary but that is only when you have a completely clean bay (no wires / pipes / protruding fasteners...) and even then you might not get the best results - i.e. the voids mentioned above.
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Old 12-04-2015, 09:40 AM   #6
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Re: Blown In Walls With Rental Machine


I do value my time a lot but I have a slow week coming up from a cancellation so I might just try to save a few bucks.
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Old 12-04-2015, 09:41 AM   #7
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Re: Blown In Walls With Rental Machine


Are you willing to open up the cavity to send the 3" hose into it? If you try to make a nozzle that is smaller than 2" you will plug your hose.

Since there is no way to restrict the amount of fiberglass being blown with an adjustable airlock slider, you will only pack the insulation in the opening you make.

Insulators turn their air up and their material feed down.

If you have a Lowes or Menards nearby, see if they have a small blue metal Krendl. It has a smaller diameter hose and has an adjustable airlock.

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Old 12-04-2015, 10:03 AM   #8
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Re: Blown In Walls With Rental Machine


I've used the krendl machine before, but I want to do fiberglass.
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Old 12-04-2015, 10:04 AM   #9
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Re: Blown In Walls With Rental Machine


The Krendl will certainly do fiberglass.... Unless you are talking about their 1970s machine




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Old 12-04-2015, 10:05 AM   #10
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Re: Blown In Walls With Rental Machine


Quote:
Originally Posted by BarryP View Post
The Krendl will certainly do fiberglass.... Unless you are talking about their 1970s machine




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Ha! Probably. Thanks, I'll look into it.
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Old 12-04-2015, 10:06 AM   #11
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Re: Blown In Walls With Rental Machine


You may be right. I just found a through blower they still make just for cellulose


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Old 12-04-2015, 10:08 AM   #12
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Re: Blown In Walls With Rental Machine


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Are you willing to open up the cavity to send the 3" hose into it? If you try to make a nozzle that is smaller than 2" you will plug your hose.
To answer this question though, I could make a single hole at the top of the wall big enough to send the 3" hose to the bottom plate and pull up as I go. 7" reveal Hardie on the outside and the top board is right under the top plate. Easy to remove and replace unobtrusively.
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Old 12-04-2015, 10:08 AM   #13
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Re: Blown In Walls With Rental Machine


Perfect!


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Old 12-04-2015, 10:10 AM   #14
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Re: Blown In Walls With Rental Machine


You won't clog your hose and you will end up with a decent job. Not packed properly, but at least you are gaining.


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Old 12-04-2015, 10:13 AM   #15
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Re: Blown In Walls With Rental Machine


Awesome, thanks. I'll do it from the outside then with one hole per bay. I'll just try my best to get the hose pull speed to achieve a reasonable PCF.

I've done a few thousand bags in attics, but never walls. Do I need some sort of mesh at the hole so it doesn't blow out while installing?
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Old 12-04-2015, 10:17 AM   #16
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Re: Blown In Walls With Rental Machine


Mesh may work. I don't know how you will do that.

Get a towel to stop the material from coming back on you. Get a mask too


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