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Old 05-04-2017, 09:51 PM   #1
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Insulation for my engine cover.

My engine cover area needs more insulation. The floor is good but the actual engine cover gets pretty hot even with the old factory insulation. Whats best to add underneath? or should i try to glue/screw something to the cover inside the bus with us.

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Old 05-05-2017, 06:44 AM   #2
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My engine cover area needs more insulation. The floor is good but the actual engine cover gets pretty hot even with the old factory insulation. Whats best to add underneath? or should i try to glue/screw something to the cover inside the bus with us.
DynaMat and like products are very good - and very expensive. Some home improvement stores have "rubberized flashing" which is similar to DynaMat and is more affordable. It works well.

Anything will be better than nothing and doing both sides will be best. However; I've not had great success getting insulation to hang upside down on engine covers. Some do it successfully but I guess I don't clean well enough or attach well enough or something...
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Old 05-05-2017, 10:17 AM   #3
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DynaMat and like products are very good - and very expensive. Some home improvement stores have "rubberized flashing" which is similar to DynaMat and is more affordable. It works well.

Anything will be better than nothing and doing both sides will be best. However; I've not had great success getting insulation to hang upside down on engine covers. Some do it successfully but I guess I don't clean well enough or attach well enough or something...
I have been watching youtube videos on this and saw the dynamat equivalent from the hardware store. My only concern is that it has tar on the back side. What are the fumes like? My wife has allergies and is extremely sensitive to odors.
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Old 05-05-2017, 11:40 AM   #4
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I'm curious what others use also. I have been wanting to cover the engine cover to make it quieter and cooler but have not yet attempted to tackle it.
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Old 05-05-2017, 01:08 PM   #5
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i tried that dynamat alternative from HD. it works fine, but it doesn't hang upside down for long.

i applied it to the underside of my doghouse, and as the engine heated up the tar loosens and it falls off. it also leaves a big mess of tar down the engine where it drips.

someone else applied the same stuff the the top of their doghouse and then glued down auto carpet on top of it. it looked great. i will copy when i get around to it again.

i had a thread about interior noise a few years back when i did the dynomat. it lowered the noise by ~5 dbs. enough to make it worth it.
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Old 05-05-2017, 02:48 PM   #6
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I smell a little something when I install it but nothing after that. However; I'm not very smell sensitive so not a good one to comment on that.

Here is an install I did a few years ago in an older MH. It made a difference but I did not do the doghouse as I could not figure out how to glue carpet to it.
Who needs friends like these?? - JdFinley.com

Here is a recent install on my current home. Again, seems to make a difference but I didn't attempt to measure it. And again, none of this is hanging upside down or on the engine side of the wall.
Closing the Gaping Hole - JdFinley.com

I read about a guy that covered the inside of a van with MLV and said it made a big difference. I would think so but probably weighed a ton and had to take an enormous amount of time.
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Old 05-05-2017, 02:52 PM   #7
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I'm just gonna build a "box" type cover out of plywood that will cover the doghouse and serve as a table and will have a couple cup holders for me, the driver.
I'll insulate the heck out of it with rockwool. Rockwool is GREAT for deadening sound and is also fire proof.
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Old 05-05-2017, 02:56 PM   #8
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Rockwool is great stuff but it can and will hold moisture. In fact, it is used by many growers as a seed starter medium because it holds moisture so well.
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Old 05-05-2017, 04:13 PM   #9
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Rockwool is great stuff but it can and will hold moisture. In fact, it is used by many growers as a seed starter medium because it holds moisture so well.
The kind used for insulation is hydrophobic. And its inorganic.
Besides- its not gonna get wet under plywood over a sealed plastic engine cover. Would be a great choice as it can slow the progression of a fire. Why i'm using it for interior walls.
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Old 05-05-2017, 05:22 PM   #10
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That is some amazing stuff. Is it available at local big box stores or do you have to purchase somewhere else?
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