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Old 03-07-2016, 01:48 PM   #1
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Sound dampening - 2016 Jayco Precept 29UR

Decided to do some sound dampening for our Precept.

* Pulled up carpet & padding
* Found lots of holes leading directly to daylight - under dash where heater hose vents enter, holes were wires for outside mirrors are run, large gaps around all sides of the engine doghouse (see pictures)
* Used HVAC tape to seal holes
* Installed Hushmat on the floors & inside the front hood (underside of dash)
* Installed Luxury Liner Pro on top of the Hushmat
* Installed heavier carpet

Cabin read 72dbs prior to fixes..... Will post the results shortly as we are taking a trip this weekend.
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JanFeb2016 2016-03-02 001.jpg   JanFeb2016 2016-03-02 012.jpg   JanFeb2016 2016-03-02 015.jpg   JanFeb2016 2016-03-03 001.jpg   JanFeb2016 2016-03-02 019.jpg  

JanFeb2016 2016-03-03 004.jpg   JanFeb2016 2016-03-07 003.jpg   JanFeb2016 2016-03-07 002.jpg  
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Old 03-08-2016, 05:29 AM   #2
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sjarr, should be a great improvement. Thank you for the pics & detail.
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Old 03-10-2016, 12:33 PM   #3
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I am very interested in knowing the results. I love our 31UL in every aspect, other than the noise. Driving around in a diesel previously, to me it appears that there is a lot engine noise that accompanies us on our rides.
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Old 03-13-2016, 05:46 PM   #4
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In for the results
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Old 03-20-2016, 08:24 PM   #5
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Anxiously waiting for results.
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Old 03-28-2016, 07:58 AM   #6
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Sound dampening RESULTS

Morning all, just completed at 1500mi trip with the sound dampening improvements. Cabin noise level dropped 8dbs!

Next step is to apply the hush mat to the stair well - most of the remaining noise is coming from there.
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Old 03-28-2016, 08:04 AM   #7
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Sound Dampening - Side notes

All wanted to share some additional side notes related to this project.

* Under DASH
Applied hush mat to the underside of the dashboard - open the front hood and the fiberglass 'roof' is actually the underside of the dash - lots of noise was being transmitted through here

* Seat removal
1. Unplug the seat motors (passenger side had to actually remove the seat controller)
2. Remove the cotter pin from the single bolt/nut holding everything together
3. Remove 3/4" nut
4. Pull up seat

* Doghouse carpet
The carpet is hot glued to the doghouse. Removal is a real chore and took several hours of peeling back bits of carpet and using a utility knife to cut off the glue. Needless to say this portion of the carpet was destroyed during the removal process. If one was short on time/patience you could probably just install the heaviest carpet you could find over the existing carpet.

* Left over carpet
The remaining carpet (i.e. not the doghouse) came out quickly and in two pieces. I re-used it in the storage compartments, after removing all of the staples in it.

* Windshield columns
Remove the plastic covers on the passenger/driver side of the windshield and stuffed the empty hole (great for noise/whistles) with rock wool insulation (Roxul) which is waterproof, fireproof and sound deadening.

* Finished project picture
Still need to cut off the small pieces of carpet that run up the wall and re-install molding.
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Old 03-28-2016, 11:01 AM   #8
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Thanks sjaar.. Great info here. I will plan a weekend to do this project.
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Old 03-28-2016, 05:04 PM   #9
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Pictures of the ROXUL insulation installed in the side windshield pillars.
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JanFeb2016 2016-03-03 006.jpg   JanFeb2016 2016-03-03 007.jpg  
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Old 03-28-2016, 05:30 PM   #10
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Quote:
Originally Posted by sjarr View Post
Morning all, just completed at 1500mi trip with the sound dampening improvements. Cabin noise level dropped 8dbs!

Next step is to apply the hush mat to the stair well - most of the remaining noise is coming from there.

WOW 8dbs! That's huge! Great mod!
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