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Old 10-14-2013, 10:48 AM   #1
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Thoughts on Blow Insulation?

Hiya!

Opinions, please. =)

I've been considering putting blow insulation above the wood layer in my rig by putting a little bit at a time up through the light holes and then use my Metro Dryer/Blower on LOW with no nozzle to blow it up into the corners of each section until full. Of course I won't do this until all of the roof is repaired/replaced.

Any reason I shouldn't do this? Including:

- Dust as the rig is moving
- Fire hazard with my old school hot lights
- Fire hazard from CA sun/heat?
- A reason why that section in there needs to be "open" and "breathe" for wood rot, moisture, etc.?
- Anything else?

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Old 10-14-2013, 04:42 PM   #2
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What kind of blow insulation??? Paper, Styrene beads, pink fiberglass?
If you're replacing the roof, you could spray sytrafoam on the roof between the studs like seen on television.

Open and Closed Cell Spray Foam Insulation - YouTube
DIY Spray Foam Insulation - Poor Man's Spray Foam - YouTube
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Old 10-15-2013, 12:44 AM   #3
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Fantastic questions! I hadn't considered the type at all. I was anticipating that there was a reason why I should not put it up there.

For example on the Home Depot site it says:

Before You Insulate
First, make sure that your house is properly ventilated. Adequate ventilation is necessary to prevent too much heat and condensation from building up as well as to provide fresh air. Next, plug leaks to prevent air from getting in and out around windows and doors. Always fix leaks before installing insulation, as they may be difficult to find after the job is finished.

So although I'd love the extra insulation in the hot CA sun to keep the heat out and our cool air inside; but if that means I could have moisture issues because there's no breath ability up in that header if I shove a bunch of insulation up there then I'd be happy to have one less thing to do. Lol!

I'm still considering putting up the very thin pink sheets of insulation up before my headliner goes back up. I'll have screws (with white caps) in the ceiling holding up the headliner in place. If I don't caulk the holes and I get a future leak it should show on the screws, right?

Thanks!!
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Old 10-15-2013, 12:46 AM   #4
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PS. I'm not replacing the roof. It's in great condition and will be excellent when I'm finished with it (hopefully!!).
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Old 11-24-2013, 06:27 PM   #5
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To close out this thread:

I've decided not to put insulation up in the area above the plywood and under the metal roof. I was most concerned about the "ventilation" issue and figured that's why there isn't any up there now. I can always revisit this through the ceiling light openings, but for now the headliner is getting sealed up and I didn't take this step.

Thanks =)
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Old 11-25-2013, 06:12 PM   #6
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I think I would have filled it. I don't believe moisture is an issue in an RV ceiling, but I cannot cite any authority that says that.
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