So I got down to some sound deadening this weekend myself...
In addition to 11mm Cloud 9 all-round, I used some waterproof Cloud 9 'cush n wood' on the door cards. For the front footwells, I used both 11mm Cloud 9 with a layer of 4mm waterproof on top. For the boot, I used a layer of 11mm Cloud 9, with two layers of 4mm waterproof on top. Both the door cards and boot were already fully covered with Dynamat X-treme from my initial sound deadening attempts 10 years ago.
I then filled the rear quarters with expanding building insulation foam. This stuff is amazingly light - the same weight as those styrofoam packing chips. It expands nicely. I went for the Screwfix 'No Nonsense Expanding Foam Gun Grade 750ml' (code 87934) for £3.49, and the 'No Nonsense Foam Applicator Gun' (code 28483) for £16.19 (as I can sell the gun onwards to a mate who's a builder for £10). Filling both rear quarters thoroughly required around 1.5 of those 750ml cannisters. I'm going to fill the boot lid liner and A/B/C pillars with it next.
On the roof, underneath the 11mm Cloud 9, I laid with 6 sheets of Silent Coat undernearth - 3 in the front half of the roof and 3 in the rear half. The roof liner carpet only 'just' fitted back on, with some patient work. The silent coat is so much easier to lay with a hot air gun. I don't know how I managed the doors and boot without one before.
So with all the interior fittings back in, minues the rear seats and parcel shelf, I took her out for a drive, and the vehicle was noticeably quieter. Noticeably less general road noise. Markedly less exhaust sound from my LongLife decat. It's always even better with the rear seats in.
However, the main purpose of this sound deadening endeavour is to eliminate all rattles from my powerful subwoofer. I will have to wait to receive my amp bank from the Amp Doctor before I can report further on that. I will then see if filling all the plastic pillar and rear trim provides additional benefits.
Incidentally, I am now selling 75% of a roll of 11mm Cloud 9 (8.5m of a 15m roll remaining), with a few spare metres of 4mm waterproof Cloud 9 for your doorcards too. See here.
In addition to 11mm Cloud 9 all-round, I used some waterproof Cloud 9 'cush n wood' on the door cards. For the front footwells, I used both 11mm Cloud 9 with a layer of 4mm waterproof on top. For the boot, I used a layer of 11mm Cloud 9, with two layers of 4mm waterproof on top. Both the door cards and boot were already fully covered with Dynamat X-treme from my initial sound deadening attempts 10 years ago.
I then filled the rear quarters with expanding building insulation foam. This stuff is amazingly light - the same weight as those styrofoam packing chips. It expands nicely. I went for the Screwfix 'No Nonsense Expanding Foam Gun Grade 750ml' (code 87934) for £3.49, and the 'No Nonsense Foam Applicator Gun' (code 28483) for £16.19 (as I can sell the gun onwards to a mate who's a builder for £10). Filling both rear quarters thoroughly required around 1.5 of those 750ml cannisters. I'm going to fill the boot lid liner and A/B/C pillars with it next.
On the roof, underneath the 11mm Cloud 9, I laid with 6 sheets of Silent Coat undernearth - 3 in the front half of the roof and 3 in the rear half. The roof liner carpet only 'just' fitted back on, with some patient work. The silent coat is so much easier to lay with a hot air gun. I don't know how I managed the doors and boot without one before.
So with all the interior fittings back in, minues the rear seats and parcel shelf, I took her out for a drive, and the vehicle was noticeably quieter. Noticeably less general road noise. Markedly less exhaust sound from my LongLife decat. It's always even better with the rear seats in.
However, the main purpose of this sound deadening endeavour is to eliminate all rattles from my powerful subwoofer. I will have to wait to receive my amp bank from the Amp Doctor before I can report further on that. I will then see if filling all the plastic pillar and rear trim provides additional benefits.
Incidentally, I am now selling 75% of a roll of 11mm Cloud 9 (8.5m of a 15m roll remaining), with a few spare metres of 4mm waterproof Cloud 9 for your doorcards too. See here.