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Cab Insulation

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4 months 2 weeks ago - 4 months 2 weeks ago #252485 by Lang
Cab Insulation was created by Lang
A bit of discussion on cab insulation on Rockwiz little Trader project. Probably worth its own thread.

I agree with Cobbadog that the best insulation is the flashing from Bunnings. It is very similar to Dynamat, the industry standard, but about 1/3 the cost. It comes in various widths from 2 inches to 2 feet.

Made of aluminium foil with a sound/heat deadening rubber toffee backing. It moulds beautifully to odd shapes and you can go over humps and bumps with no creases.

It sticks like nothing else on earth so you have to be right the first time before you press it on.Cut out your shape before removing the backing sheet.

I have used it for years on many vehicles both on the floor and cab sides and roof. A big bit inside the doors makes a surprising difference to noise as well.

This 10 metre roll would be enough to do a whole cab.

 
  • Last edit: 4 months 2 weeks ago by Lang.
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    4 months 1 week ago #252492 by Blackduck59
    Replied by Blackduck59 on topic Cab Insulation
        Dyna Mat or this is fine, cuts the resonance from panels. I coated the floor pan and firewall and where thickness was not a problem laid the Clark Rubber insulation over it. Guess the secondary benefit is rust may fine a hard time getting started under matting is it sticks real well.
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    4 months 1 week ago #252494 by roKWiz
    Replied by roKWiz on topic Cab Insulation
    Thanks for the info. I have the Louie's cab to do as well.

    Heritage Stonemason
    In order that the labour of centuries past may not be in vain during the centuries to come... D. Did

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    4 months 1 week ago #252513 by Mrsmackpaul
    Replied by Mrsmackpaul on topic Cab Insulation
    I have tried many different ways of insulating a cab against heat and noise
    Dyna mat works good but is it any better than the Bunnings stuff ? I doubt it it is any better

    I have tried 5 layers of carpet and that works surprisingly well for both heat and noise, I would say as good as dyna mat and and dyna liner stuff

    By far the most important and beneficial thing that I always seem to miss is sealing the cab up for holes and really good gear stick boots

    I have noticed on freezing cold days when in one of my Isuzus that the amount of air that comes thru the door handles when zooming along is enough to give my leg a chill and on a longer trip I find myself searching for rags to put over my legs

    If I know I'm gunna be in a cold area like this I chuck my old ugg boots in, very stylish look for sure

    But definitely sealing up all the holes is the most important thing for heat and noise

    When Victorian railways was building the train "Spirit of Progress" they put a car horn in a box, sounded the horn and walked away until they couldn't hear the horn
    They then measured the distance and that was their base line
    They then tried different types and different configurations of insulation and each time walked away until they couldn't hear the horn
    They did to work out which insulation combination worked best

    The gear noise of the Mack when the oil is hot and Im coasting along is of a frequency that has profound effect on my ears, I must seal that gear stick boot up one day

    Paul

    Your better to die trying than live on your knees begging
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    4 months 1 week ago - 4 months 1 week ago #252516 by Lang
    Replied by Lang on topic Cab Insulation
    Paul

    You are right about holes.

    Many years ago when I was building the marina on Hamilton Island Keith Williams was ripping the almost new Rolls Royce diesels out of his "Ulysses" and replacing them with GM's. He got a sound engineer from some big company in Sydney up to design the noise proofing.

    I did not realise how scientific this subject is. There are all sorts of considerations that we would not bother about in a truck cab but he got Keith to put floating engine mounts (almost unheard of in boats) on the GM's to stop hull transfer. Various types of boxing, air gaps, absorbing and reflecting layers resulted in the miracle of silent V-12's. Of course the exhausts went past numerous sound-deadening devices without spoiling the flow.He actually sealed the whole engine room not individual engine covers.The engineer needed ear muffs but outside the door it was no louder than a split-system air conditioner in your loungeroom.

    All this means little to us except the fact the engineer told me "All this carry-on is completely useless if there are any holes in the system such as bad gap seals on beautifully insulated engine covers"  The Onan/Cummins generators which would run when the boat was stopped had their own boxes and were so good you had to put your hand on them to check they were running.

    We are operating an open system and the best we can do is keep the heat and noise from directly entering the cab from engine, transmission and road noise. So like Paul says, fill every gap and crack and ensure gearstick, steering column, door seals, engine covers, floor access plates and pedal boots are sealed.
    Last edit: 4 months 1 week ago by Lang.
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    4 months 1 week ago #252521 by Mrsmackpaul
    Replied by Mrsmackpaul on topic Cab Insulation
    In a previous life time I fixed lifts in high rise buildings

    The vibration of noise traveling down lift ropes was a issue on heavy gear driven goods lifts with lots of sheaves

    If a piece of steel screwed to the beams the hoist motor was on vibrated at all it would be heard in the lift car

    Unscrewing the plate and putting silicon on between the mating surfaces stopped this

    I'm not sure whether our sense of sound and feel get mixed up a bit but doing this was more the enough to keep the customer from complaining

    It really is amazing how easy it is to trick the human mind

    A fella on the Mack truck forum reckons a product called "Lizard Skin" is all the go sprayed on

    I have never tried this product so can't comment

    Can dyna mat be stuck on the underside of the cab if there's not enough clearance inside ?

    I'm sure it will stick but wonder if the heat will cause it to sag over time while insulating this house I learnt that dense insulation doesn't work as well as I thought

    Shoving more layers in a tight hole doesn't work better, it actually works worse as the air gaps in foam or pink bats etc are essential to slow the travel of noise and heat

    As Lang suggested, this a lot more to this than we think there is



    Paul

    Your better to die trying than live on your knees begging
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    4 months 1 week ago #252526 by wee-allis
    Replied by wee-allis on topic Cab Insulation
    When they changed from V8 Chev petrol engines to 3208 Cats in the timber NSW Polce boats, they had to lay lead backed carpet on the cabin deck so you could hear yourself think. Trouble was the vibration went through the entire hull so sought of defeated the effort.
    Must admit they were reliable and a whole lot mor economical.
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    4 months 1 week ago #252531 by mammoth
    Replied by mammoth on topic Cab Insulation
    Another source of noise is that which reflects off the head board and onto the rear window.
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    4 months 1 week ago - 4 months 1 week ago #252546 by asw120
    Replied by asw120 on topic Cab Insulation
    The floating engine mounts Lang mentioned bring back a memory of the only time I ever saw them, as Paul reminds me - on very old lifts. The motor-generator set would be mounted on concrete sitting in about 1-1/2" thick bitumen inside a concrete box. At least one of these survived into recent times. (The antique Standard - Waygood lift in the UQ Medical School building). The old Royal Brisbane Hospital was full of them.
    As Paul, I too had to insulate the sheet metal sheave / rope guards on jobs with 50Hz vibration problems (in my case).

    Jarrod.


    “I offer my opponents a bargain: if they will stop telling lies about us, I will stop telling the truth about them”

    ― Adlai E. Stevenson II
    Last edit: 4 months 1 week ago by asw120.
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    4 months 1 week ago #252559 by bparo
    Replied by bparo on topic Cab Insulation
    a bit late to the party but if using dynamat or a similar product don't forget to put some on the back wall behind the seat to reduce drumming from that panel. It's also good on the roof. There was a version with a fabric back that looked like headlining I was going to use in my AR162 International but the inclination and funds to do so never coincided

    Having lived through a pandemic I now understand all the painting of fat people on couches!
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