Reduced heat (and noise) coming from doghouse and passenger floor of Chateau 31W

[Cyoung]

Has anyone used Kilmat mil and if so did you like results?

[16ACE27]

50 mil or 80 mil? In either case it's much thinner than what everybody is using. I don't see how it would do as good a job.

[Long & Winding road]

I purhased some Kilmat for my RV a year ago (cheap price) but its not as sticky as Dynamat or Fatmat brands. I would NOT buy Kilmat again for this very reason.

[LandKO]

I’ve got a question for those of you that have insulated the dog house.
Granted, you may have reduced the heat from the engine compartment transmitted into the cabin, but where did the heat go? The engine is still producing the heat so it’s got to go somewhere. Have you noticed any increase on your water or oil temperature while stuck in traffic or climbing inclines after you installed the insulation?

[16ACE27]

Originally Posted by LandKO

I’ve got a question for those of you that have insulated the dog house.
Granted, you may have reduced the heat from the engine compartment transmitted into the cabin, but where did the heat go? The engine is still producing the heat so it’s got to go somewhere. Have you noticed any increase on your water or oil temperature while stuck in traffic or climbing inclines after you installed the insulation?

Ambient losses to the air moving past the engine and doghouse. Your coach is not a heatsink for the engine.

[LandKO]

Originally Posted by 16ACE27

Ambient losses to the air moving past the engine and doghouse. Your coach is not a heatsink for the engine.

I understand your point, but with the added insulation, heat from the engine is reflected back towards the engine. When sitting in traffic, there is less air movement across the engine. My question was did this cause a measurable temperature increase in the fluids.
This increase may be insignificant and nothing to worry about.
Thanks for your reply.

[16ACE27]

Somebody has waaaay too much quarantine thinking time on their hands.
The engineers have to take zero ambient cooling into the design of a water cooled engine because, especially in a motorhome, they have no idea how the engine will be encased. The only important criteria is the airflow across the radiator and the ambient temperature of the air going through the radiator.

In conclusion: there is no, zero, none, difference on the operating temperature of the engine due to insulating the doghouse and/or surrounding areas.

[Rysiek]

Originally Posted by 16ACE27

Somebody has waaaay too much quarantine thinking time on their hands.
The engineers have to take zero ambient cooling into the design of a water cooled engine because, especially in a motorhome, they have no idea how the engine will be encased. The only important criteria is the airflow across the radiator and the ambient temperature of the air going through the radiator.

In conclusion: there is no, zero, none, difference on the operating temperature of the engine due to insulating the doghouse and/or surrounding areas.

[emoji16][emoji16][emoji16]...
Just got my additional (3rd) roll of Dynamat and still waiting for more of Fatmat to insulate our 2015 Axis 24.1 even more. Last year I insulated the doghouse, empty spaces under the dashboard around the driver, passenger and above the doghouse area. The speakers were removed and the bottomless holes were filed with all leftovers I had. Then, I took apart more of the upper part of the dashboard on driver and passenger side where the computer desk is and applied more of Dynamat/Fatmat. The spaces were so packed with insulation that I had a hard time to put everything back together. Next project was done outside of the coach. Insulated the engine compartment as much as I could. What a task that is. And I am not a big guy. Everything I had at that time was applied to the inside walls, firewall and even the front grill. The results were amazing but I knew I still could do even more.
Now, couple of days ago while replacing broken led strips (under the headlights) and installing front grill's aluminium sheet to protect the radiator from rocks I noticed again, how much more of Dynamat/Fatmat I could still use under the hood. This space is so huge. Plenty of room to apply another layer of insulation where I can.
So, reading these great posts gives me more confidence and reassures me that I am doing the right thing and I am not the only one dealing with something Thor should be doing at their factory. That is enough, Home Depot is waiting...[emoji14][emoji14][emoji14]

[Long & Winding road]

Wow Rysiek, your catching up with me!

I have two and 3 layers under my hood on the firewall + dash + all the other areas you mention.

I think the underside of the dash (assessed from under your hood) I have 3 layers total. One helped a lot, 2 was a little better but the 3 layer its hard to say. I would not add anymore after 3. I started out with the asphalt type first then two layers of the 3/4 inch foam Fatmat for 3 layers total.

I just purchased more Dynamat.... Im always finding new spots to insulate and make it quieter / cooler (or warmer) inside.

I did the underside + walls of my step well - helped a lot with heat (and cold in the winter) + some sound. I added some to the bottom of the screen door and outside door - took most of the rattle out and sounds more solid when closing the doors.

I added some to the floors of each compartment in each room as well (under cabinets + drawers etc. Under the shower + toilet as well (though the access holes and heat vent hole).

Now I hear wind noise (might be from the mirrors too) while driving that never could hear before.

Its not real bad but Im trying to figure out how to deflect some of the wind way from the windows to see if it helps.

[twovillagers]

This will come as no surprise to anyone who has removed their doghouse on a Thor Vegas.
Just finished the removal and was surprised the total amount of insulation was two barely attached, small rectangles of foil backed foam that covered about 15% of the surface-nearly useless!

Tomorrow, I will be installing Thermo-Tec Heat and Sound Supressor everywhere I can. I am anticipating a major improvement!

[Rysiek]

Originally Posted by twovillagers

This will come as no surprise to anyone who has removed their doghouse on a Thor Vegas.
Just finished the removal and was surprised the total amount of insulation was two barely attached, small rectangles of foil backed foam that covered about 15% of the surface-nearly useless!

Tomorrow, I will be installing Thermo-Tec Heat and Sound Supressor everywhere I can. I am anticipating a major improvement!

I just replaced the folding sofa bed in our 2015 Axis 24.1. While the entire slideout area was exposed I covered the floor with one layer of Dynamat.
Also, I removed ( and cleaned) the house batteries from under the stairs and built enclosure by covering all openings. I have applied more Dynamat to the walls of newly created battery box as well as the underside of the step, covering the battery. I still need to slide under the coach and apply more of Dynamat to that box, storage boxes on both sides and wheel wells. That will be the last insulation job. Right now the noise level in my coach dropped to 57db. Here are few pictures.

[twovillagers]

Originally Posted by Rysiek

I just replaced the folding sofa bed in our 2015 Axis 24.1. While the entire slideout area was exposed I covered the floor with one layer of Dynamat.
Also, I removed ( and cleaned) the house batteries from under the stairs and built enclosure by covering all openings. I have applied more Dynamat to the walls of newly created battery box as well as the underside of the step, covering the battery. I still need to slide under the coach and apply more of Dynamat to that box, storage boxes on both sides and wheel wells. That will be the last insulation job. Right now the noise level in my coach dropped to 57db. Here are few pictures.Attachment 24250Attachment 24251Attachment 24252Attachment 24253Attachment 24254

Those are some great improvements. I wish I had thought about the slide when I replaced the sofa with recliners-but, I still have the opportunity of the battery area!

Thanks for sharing!!