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Old 01-08-2018, 10:01 PM   #1
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Doghouse insulation - tell me why this won't work

After searching threads on this subject, the consensus seems to be that Dynamat or similar won't hang upside-down very well, or at all.

Could I remove the old foam/fiber/batting, layer Dynamat to the same thickness, then secure it with hurricane straps bent to match the inner curve and bolted into place? I'm not worried about the bolt nuts being visible in the cab, as I'll have cabinetry hiding the doghouse.

Would there be a problem with a bolt head possibly resting against the turbo pipe, or against the rear of the engine? And would the Dynamat need a covering of header tape or similar?

(bike added for scale)

Thanks for any advice or suggestions.


Don
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Old 01-08-2018, 11:13 PM   #2
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I don't remember anybody being real happy with insulating the inside of the doghouse, either for sound proofing or heat issues.

The folks that seem happy built a cover for over the doghouse. You can have cup holders this way.
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Old 01-09-2018, 08:05 AM   #3
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I dynamatted the doghouse on my DT360. and the flat plate on my T-444E. and the result is i have just as much heat as I had nefore and not much less noise..

on the DT I had issues with the dynamat coming down from the heat...

im with robin I thinking making a doghouse cover if you still have clearance for your feet is the way to go... you can insulate it for heat and noise..
Dynamatting the inside of the footwells on the bus makes a little noise improvement but zero heat improvement..

-Christopher
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Old 01-09-2018, 10:33 AM   #4
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About the only positive feedback I have heard on Dynamat was from hot rodders who used it on previously bare sheetmetal. They claimed some noise reduction (when every square inch was covered $$$). Never heard of anyone satisfied with its' heat reduction.

Sound reduction requires mass. As in a pound or more per sq. ft. Sheet lead is toxic but still the best there is.

Heat reduction requires thermal reflectivity...absorbtion...and/or a thermal break. Think Shuttle Tiles and the way they are installed.
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Old 01-09-2018, 07:21 PM   #5
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Thanks for the input guys. Will demolish this drawing board, and go back to my old one.


Don
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Old 01-10-2018, 06:29 AM   #6
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Quote:
Originally Posted by Tango View Post
About the only positive feedback I have heard on Dynamat was from hot rodders who used it on previously bare sheetmetal. They claimed some noise reduction (when every square inch was covered $$$). Never heard of anyone satisfied with its' heat reduction.

Sound reduction requires mass. As in a pound or more per sq. ft. Sheet lead is toxic but still the best there is.

Heat reduction requires thermal reflectivity...absorbtion...and/or a thermal break. Think Shuttle Tiles and the way they are installed.
if I took the carpet out of a car for a Build I dynamatted the whole floor and footwells.. it made a surprising difference in the amount of road noise.. I always installed or updated the A/C so i didnt care about the heat
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Old 01-10-2018, 08:31 AM   #7
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Are you using regular sound deadening dynamat? Might have better luck with the under hood dynamat stuff for insulating doghouse. Regular dynamat will hang upside down, I was a 12v installer at car toys for decade, and have done more roofs than I can count, and with good prep never had an issue with it staying on metal surfaces (regular dynamat)
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Old 01-10-2018, 09:24 AM   #8
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Are you using regular sound deadening dynamat? Might have better luck with the under hood dynamat stuff for insulating doghouse. Regular dynamat will hang upside down, I was a 12v installer at car toys for decade, and have done more roofs than I can count, and with good prep never had an issue with it staying on metal surfaces (regular dynamat)
i think the issue is that the doghouses are plastic.. at least mine is..
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Old 01-10-2018, 10:09 AM   #9
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Gotcha...that makes more sense.
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Old 01-10-2018, 12:44 PM   #10
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Would using foil backed under hood felt work?
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