Thread: Possible toxicity issue with bituplus modified membrane (used for sound-dampening)

As part of my sound-dampening procedures for my Defender 110 CSW, I’ve been considering the use of Bituplus Modified Waterproofing membrane to reduce vibration in the floors, side panels and roof.

Of course, bitumen (asphalt) contains carcinogens. While there is most danger to (e.g.) roofing workers, Bituplus membrane on the floor of a vehicle would be subject to some (perhaps considerable) temperature change, as would parts of the vehicle exposed to constant, strong sunlight.

we spend many hours in the vehicle, including sleeping. The presence of potentially toxic fumes does appear to be an issue.

Any thoughts on this from layman or expert?

MATERIAL SAFETY DATA SHEET
SBS MODIFIED BITUMEN
WATERPROOFING MEMBRANE

Bitumen membrane. Asphalt odour. Under normal use, this product is not expected to create any health or environmental hazard.
Inhalation of dust or of asphalt fumes can cause a respiratory irritation and/or a congestion.

WARNING! This product may contain substances known by the State of California that could cause cancer (asphalt, crystalline
silica, fibreglass, antimony trioxide).

Certainly doesn't sound good. The most suitable materials for this purpose are mass loaded vinyls (usually barium). Its a very common building material and is generally not hazardous (unless you burn it at ~1500*C, in which case barium is the least of your worries).

It's not cheap, but its the best stuff around.