Sound insulating the doghouse
In own a 2007 Mirada class A motorhome. And in my coach the only thing between me and a howling V10 was fiberglass and carpet. I was looking for a way to significantly reduce the noise and heat transmission through the doghouse or tunnel. Here is what I did.
6 X 2" elevator bolts in 1/4"
6 X 1/4 nylon lock nuts
6 X 1/4" fender washer
1 sheet of metal lathe with ridges.
1 package of Roxul Safe and sound insulation. (Comes with 12 pieces)
You can buy everything at Lowes except the Roxul which Home Depot carries. Some Lowes are starting to carry Roxul as well.
I removed the doghouse and laid it upside down and laid to pieces of Roxul side by side in the Dog house. that filled the doghouse perfectly. I then trimed it to fit with a serrated bread knife or a saws all blade. On top of the 3" thick Roxul I laid the metal lathe I believe that it was 28" wide. I trimmed the lathe to length and clipped the corners to fit. I used tin snips and a metal cutoff tool using an abrasive disk. I then drilled the 6 holes through the top of the doghouse. I inserted the elevator bolts though the carpet, fiberglass, insulation, and metal lathe. As the bolts are 2" you will need to press down on the lathe firmly to attach the washers and nuts. That's it! I still had space between the lathe and the engine intake. I had to press down more to re-insert the doghouse bolts and that's good.
Test drive impressions were amazing. I hope for some relief from the noise and I got more than I could have hoped for. Conversation and movies are much easier to hear now. I believe that the heat should be lessened significantly also. Total price was just under $50. I am so pleased with the results and so is my wife.
Roxul is made from basalt and slag and is pure rock. Melting point is over 2200 degrees Fahrenheit. Google it it has a lot of amazing properties but remember that Roxul comes in two forms. One is for temperature insulation and one is for sound. I recommend the Safe and Sound which is designed to stop noise.
(Sent from my phone so forgive any typos please)