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Insulation In 6 Sided Box

 
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Old 12-12-2017, 07:55 PM   #1
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Insulation In 6 Sided Box


I am putting together pricing for building offices in an existing steel manufacturing building. It will be insulated and heated separately from the rest of the building which is only partially heated.

A lot of the walls I will be building will back up to exterior walls of the building. I want my insulation to not be connected to the air of the rest of the building.

My initial thought was to install OSB on the back of the walls prior to standing them. That is a lot of cost and weight (several hundred feet of 12' walls). I have also considered 1/2 foam or visqeen.

This would be a similar situation to standing up a wall in a basement against the foundation. The difference being there is more air moving around in the building I am working on with large space and many overhead door. It is also dirty air from manufacturing.

It would also be similar to situations where insulation's from walls meets attics in places like vaulted ceiling.

Does anyone have a good approach to a situation like this?
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Old 12-12-2017, 07:59 PM   #2
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Re: Insulation In 6 Sided Box


What are the current exterior walls you will be building next to?

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Old 12-12-2017, 08:19 PM   #3
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Re: Insulation In 6 Sided Box


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What are the current exterior walls you will be building next to?

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Fiberglass insulation blanket and steel exterior.
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Old 12-12-2017, 11:53 PM   #4
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Re: Insulation In 6 Sided Box


Will the offices have closed vestibules that open and close into the plant, to reduce office heat and air loss, as well as provide a place for PPE distribution?
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Old 12-13-2017, 01:06 AM   #5
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Re: Insulation In 6 Sided Box


Make sure you understand required paths of travel for your build, requirements change depending on space and use.

OSB has a lot of air infiltration unless you use an Advantech type product.
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Old 12-13-2017, 07:46 AM   #6
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Re: Insulation In 6 Sided Box


HDavis is right
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Old 12-13-2017, 09:20 AM   #7
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Re: Insulation In 6 Sided Box


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Will the offices have closed vestibules that open and close into the plant, to reduce office heat and air loss, as well as provide a place for PPE distribution?
No, They had their own architect draw the plans so I don't have a lot of say in that.
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Old 12-13-2017, 09:22 AM   #8
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Re: Insulation In 6 Sided Box


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Make sure you understand required paths of travel for your build, requirements change depending on space and use.

OSB has a lot of air infiltration unless you use an Advantech type product.
They are good on their paths of travel. I am just responsible for the build the design was handled by an architect and I am very comfortable with it.
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Old 12-13-2017, 09:42 AM   #9
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Re: Insulation In 6 Sided Box


Just stand up metal (or wood) studs against the outside walls and fill the stud cavities with fiberglass blanket covered with drywall. No need for anything on back side of studs as you have that exterior wall and insulation there and will be creating a pretty thick dead air space.

Don't over think or over complicate this. People have been successfully building plant offices like this for many years.

Seal everything off tight at ends of walls, where walls meet roof deck, door thresholds, etc. so that the factory air does not infiltrate the office air. Often times factories will have significant exhaust systems creating a negative pressure in the building which can suck the heat & AC out of interior offices.
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Old 12-13-2017, 01:46 PM   #10
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Re: Insulation In 6 Sided Box


^^^...what he said is really good advice.

Andy.
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Old 12-13-2017, 07:55 PM   #11
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Re: Insulation In 6 Sided Box


My hesitation of no backing is that the last build out I did for them had a huge amount of very cold air coming from that space. I don't know why so much air was getting in there but it was. It was January when I was working on it so I was there at the time to see the condition at the most critical time.

No one ever complained about it, but I made a mental note that I might need to consider a better way.

One difference is that the last build out had a floor issue that required space between the exterior wall and my wall. I am still tempted to plywood the back of the wall, although the feedback has me considering trying it without this time since I would be able to build it without the space between.
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Old 12-13-2017, 09:00 PM   #12
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Re: Insulation In 6 Sided Box


Maybe fiberglass gypsum boards? Can you use wood studs and meet fire code?

Is a sprinkler system being upgraded/ installed? : thus water resistant materials to survive fire incidents.

Locally, fire inspectors have had remodeled very large buildings cut in two and a fire truck access alley way installed......

Are fire rated walls required every so often in the "new" desk jockey barn?
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Old 12-14-2017, 01:39 AM   #13
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Re: Insulation In 6 Sided Box


Maybe roxul sheathing? Non combustible, sound reducing and insulating, also think it's pretty good regarding getting wet............
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Old 12-14-2017, 10:29 AM   #14
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Re: Insulation In 6 Sided Box


If You're concerned about air infiltration, treat it like any other envelope. Gasket bottom of wall to floor, continuous glue interior drywall to bottom channel, and deal with through penetrations.

It makes it quieter, too.

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