Sound deadening

[Wadey]

Iv acquired 2 boxes of 12"x 12" sound deadening pads like dyna mat it's good quality stuff just
My question is do I buy more and do the whole of the inside of the van or just use what I have and space it out on the roof and sides ??
I know the more I use the quieter it will be but is it worth it ?

[Beaker]

Difficult to say really - it depends on what you intend to use as your insulating material. If you intend to use a loose fit insulation like Rockwool, recycled plastic bottle insulation or silver foil bubble wrap, they do very little to deaden sound - so you need more of your Dynamat type stuff. However if you plan on using self adhesive thermoliner, it has excellent acoustic deadening so you don't really need the Dynamat at all. This is how I have done it, the thermoliner makes a huge difference, and I did not install any Dynamat first. I can honestly say that on the motorway the van is no noisier than my Mondeo estate.

Doing the whole van is expensive overkill though - from what I can see you only need a piece in the middle of a panel - you don't need to cover all of it.

Like this:

[transitcat]

Difficult to say really - it depends on what you intend to use as your insulating material. If you intend to use a loose fit insulation like Rockwool, recycled plastic bottle insulation or silver foil bubble wrap, they do very little to deaden sound - so you need more of your Dynamat type stuff. However if you plan on using self adhesive thermoliner, it has excellent acoustic deadening so you don't really need the Dynamat at all. This is how I have done it, the thermoliner makes a huge difference, and I did not install any Dynamat first. I can honestly say that on the motorway the van is no noisier than my Mondeo estate.

Doing the whole van is expensive overkill though - from what I can see you only need a piece in the middle of a panel - you don't need to cover all of it.

Like this:

What's the thermal insulation like for thermoliner when you apply it in squares like that and not all over? Did you put anything on top of it?

[Beaker]

You cover the whole panel with Thermoliner - don't leave any gaps if you can help it.

Yes you can stick it over the sound deadening sheet - it won't do any harm.