Cab Interior Rear Corners

[Guardm16]

OK all you 35 builders. I decided early on that I wanted to have a side exhaust on my extended cab truck. I think it turned out very good.
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But with everything there are unintended consequences. In this case excessive heat from the exhaust travels up into the cab from behind these panels
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I can and will put Dynamatt down but as most of you know this area and the aluminum panel that caps this area do not seal well to the outer cab fiberglass. So I am sure heat will still find its way in. What have others done to help seal this area. Even without the exhaust tips down there the aluminum cap will always let in heat, noise, road moisture etc. What is the best answer?

1) foam insulation like pipe wrap
2) spray foam
3) something I am not thinking of? LOL

Any suggestions are welcome.

[mkassab]

Depending on the gap size, some sort of silicone chalk or butyl rubber sealant. It really never gets hard, can flex and won't crack. Also, a material like a pool noodle that doesn't absorb water but has air pockets for insulation properties.

I'm thinking foam, whether pipe wrap or spray foam will absorb water?

See below pic... did you install panels 4 & 5? If you can, put another horizontal panel towards the bottom and fill area in between the bottom panel and panels 4 & 5 with some sort of insulation?

Keep us posted what you end up with and how it worked with the heat and noise.

Mark

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[Guardm16]

Depending on the gap size, some sort of silicone chalk or butyl rubber sealant. It really never gets hard, can flex and won't crack. Also, a material like a pool noodle that doesn't absorb water but has air pockets for insulation properties.

I'm thinking foam, whether pipe wrap or spray foam will absorb water?

See below pic... did you install panels 4 & 5? If you can, put another horizontal panel towards the bottom and fill area in between the bottom panel and panels 4 & 5 with some sort of insulation?

Keep us posted what you end up with and how it worked with the heat and noise.

Mark

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I have not installed 4 or 5 yet. I am ready to do so, but there is a void about 12x5 and 12 inches deep. I know some people have put speakers in that area, but for me, I need to block off the lower portion with something. I got pipe insulation with foil wrap to reflect the heat, I will work on it this weekend. A side note, panels 4 and 5 still have approximately 1 inch gap to the fiberglass body and 1/2 inch around the roll cage. The manual says use weather strip. That's still a big gap. I will probably use additional Dynamat to cover the gaps

https://www.amazon.com/dp/B0FT7R9L68?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

The idea is to stack it like cord wood to fill the space

[Guardm16]

Update: So I used some heat insulation materiel I had for the trans tunnel. I made a pattern from the "rear cab cap" parts #4 and 5.

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I located this insulation in the bottom if the "well" and used foil tape. The kind made for HVAC duct work. This tape sealed up any cracks. I also used foil wrapped pipe insulations to fill any large gaps like the one behind the cab where it opens to under the truck bed.

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I used expandable spray foam to fill approximately 1/2 the void. This picture is right after I sprayed. After about an hour, the foam had filled the area just short of the door striker bolts you see and covered the pipe insulation. The void is now sealed very well.

[Mick40]

Just an FYI the foam is flammable. Not sure how hot it will get there. Your build is awesome!

[Guardm16]

I have two layers heat shield material below the foam. Thanks for checking on me. Seriously, I do appreciate it. And thanks for the complement on the build.

[fact5racer]

I have two layers heat shield material below the foam. Thanks for checking on me. Seriously, I do appreciate it. And thanks for the complement on the build.


Funny, I was driving home just now from the upholstery shop thinking about that area. My exhaust goes out the back so heat won't be an issue, so I was thinking of cutting a pattern, then get one of those pads that are about 1.5 thick from Home Depot for kneeling on, and cutting that to squish down tight to the floor.