sound deadening quantity

Hi all,
After my 1st winter of owning a defender I've learnt about condensation.
Seems like the thing to do it use the adhesive insulation/ sound deadening stuff on all the panels to stop it.
From what I've read up this stuff goes on a lot better when the weathers warmer so i'm planning to do this over the summer but want to budget the job and get the materials ready for when i have the time.
I have found loads of threads on what to use and where to use it but i've not been able to find an answer on how much is needed square metres to cover the inside of a 90.
the noise doesn't bother me to much so i'm not looking at covering every nook and cranny but i don't want to come up short of have loads extra spare.

Have anyone done this and have a good idea of the amount used?

My kit had 1.1 square metres in it and I had some left over after doing the roof and the bulkhead. I would have used more but I had carpet down. You don't need as much of it as you see people using on YouTube. You don't use it to create some kind of soundproof barrier, you use it to stop flat panels from resonating and acting like giant speakers. For each panel you only need to cover about 20% of it, placed within the centre area.

You can see on the right of the roof the sound pads and on the left the insulation. Sound pads made a big difference but won't stop any condensation. All in it cost about £60 to do the roof, of course you can spend more.
Did make a mistake by not covering the centre box section on the roof, you do need to cover it.

Do you have a full head lining fitted?
My 90 does, I covered the roof similar to the photo but also covered the box section with a more flexible insulation rather than the thicker foil one. Also shoved some of that plastic loft insulation up above the head liner.
Still get condensation on the windscreen though!

Anaconda said:

Do you have a full head

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Or is it completely empty like @JohnM70 do you mean ?

miktdish said:

Or is it completely empty like @JohnM70 do you mean ?

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I laughed when I wrote that, knew someone would say something

it just has a front head liner, i know one of the reasons for the condensation is water getting in and the fact its not air tight but after heavy rain and a cold morning it was like i had sprayed the inside down with a hose pipe so everything i have in the back ends up soaking wet.

You don't really want it air tight, warm damp air has no where to go and condensates on the cold metal roof.
My son's Ninety has no headlining at the moment, it's the photo I posted. Going to leave the rear as insulation and just fit a front head lining. His roof has air vents in the back and condensation is nowhere near as bad as my 90 was.

Anaconda said:

You don't really want it air tight, warm damp air has no where to go and condensates on the cold metal roof.
My son's Ninety has no headlining at the moment, it's the photo I posted. Going to leave the rear as insulation and just fit a front head lining. His roof has air vents in the back and condensation is nowhere near as bad as my 90 was.

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second this, my 110 has the roof vets in the back and although the roof leaks (show me one that doesn't) so there is constant actual flow of water the condensation is much better than the 90 which the roof does not leak.

Thanks for the replies, i may have to rethink what to do now and maybe put a vent or two in

marc.postle said:

Thanks for the replies, i may have to rethink what to do now and maybe put a vent or two in

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The early ones had vents in the rear of the roof.
I would spend time chasing as many leaks as possible and put some sound pads and insulate the roof.
I wouldn't insulate any thing lower down until you stop water coming in.

Anaconda said:

The early ones had vents in the rear of the roof.
I would spend time chasing as many leaks as possible and put some sound pads and insulate the roof.
I wouldn't insulate any thing lower down until you stop water coming in.

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there's a small amount coming in the front doors at the top when its raining heavy and thats about it.
It doesn't help theres always wet boots and jackets etc in the back but thats the nature of a working truck

marc.postle said:

there's a small amount coming in the front doors at the top when its raining heavy and thats about it.
It doesn't help theres always wet boots and jackets etc in the back but thats the nature of a working truck

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That doesn't sound such a bad leak then.
As you say it's all the damp stuff in the back, not much you can do about that.