sprayed insulation/soundproofinf

I have applied 3 to 4 inches of cellouse to recourding studious, theaters, classrooms etc. (walls, ceilings and crawl spaces). I do it right and have never had any problem (and allways provide full warranty). Family owned business for over twenty years and would be happy to assist. Can provide a list of satisfied coustomers. [SPAM REMOVED] TV studio, [SPAM REMOVED] restraunt, etc.

from experience.....cellulose does work. BUT.... over time it settles and leaves a 2-4" air gap at the top of the walls. I'm not sure how much this gap will affect sound isolation.

It doesn't work. See this "Spray Foam Insulation?" thread. There are more posts to this effect on the forum, but this one is the very succinct. For more on this, do a search for "spray foam" using the "Search for all terms" option. This "using foam as soundproofing material" belief has got to be one of the most durable myths around... :roll: --Keith :mrgreen:

warren toman wrote:

I have applied 3 to 4 inches of cellouse to recourding studious, theaters, classrooms etc. (walls, ceilings and crawl spaces). I do it right and have never had any problem (and allways provide full warranty). Family owned business for over twenty years and would be happy to assist. Can provide a list of satisfied coustomers. KLRN TV studio, Rainforest restraunt, etc.

What is cellouse? Searching the net superficially, it seems like sprayed polyurethane foam or ?, but can be something else as well. It's much easier for people if you describe a material or link to it, rather than giving some brand or local known name. This is a world wide forum. (and you don't give any location of yourself) There are fibrous spray products based on mineral or synthetic fibre which do work for acoustic absorption (which is still quite different than soundproofing), ........ and there are the more common synthetic expanding foam types which hardly have any acoustic function, and even have mostly a destructive effect on soundproofing when sprayed into cavities. As far as I know on the net, the latter is used to glue a garage door to a wall build behind it, to neutralize the negative effect of the cavity. In fact it was used to make the lightweight door acting as part of the wall. We even made fun of the fact that the discussion to solve an acoustic problem resulted in a material which standard always is referred as counter productive for acoustic applications. I recently adviced it for an exact similar situation here (for local project). But such applications where it can be useful in function of sound are extremely rare. If it's the latter type of foam then Sharward's comment is 120% valid. And I wonder what kind of guarantee you could ever have given in function of sound, whether absorption or isolation. Such expanding foams are designed for thermal, not acoustic applications.

warren toman wrote:

I have applied 3 to 4 inches of cellouse to recourding studious, theaters, classrooms etc. (walls, ceilings and crawl spaces). I do it right and have never had any problem (and allways provide full warranty). Family owned business for over twenty years and would be happy to assist. Can provide a list of satisfied coustomers. KLRN TV studio, Rainforest restraunt, etc.

You list nothing of the company you represent in your profile -= nothing of yourself or your qualifications and your first post in here is a self promoting come on.......... I know for a fact that people were happy knowing (at one time) that everything in the universe revolved around the earth........ that didn't kake it true. The fact that you have satisfied customers might simply mean that: a) they are ignorant - simply don't have a clue - and regardless of the fact that nothing happened with your "soundproofing application - a placebo effect took place. or b) You are a slick snake oil salesman and the townspeople are uneducated hicks just shelling out money. NOW, If you want to impress anyone here - you could always provide a copy of the tests that were performed on your materials and methods - tests that prove your claims. Otherwise - if you won't realease any test data to us - then please don't waste our time . I will leave this thread open for one day to give you a chance to provide some documentation - then I will lock it as wasteful spam. sincerely Rod

Think of the number of people who will benefit from this thread... :-) This is good stuff, regardless how it started... In fact, it's good stuff because of how it got started. 8) --Keith :mrgreen:

I dont know about the spray-on foam. My first thoughts on that stuff would be "HIGHLY FLAMMABLE???"...LOL :lol: Blown-in "cellulose" worked in my case. It help my walls with both sound suppression and thermal isolation. The before and after was like night and day. And that's from 1st hand experience, not from reading test data sheets. But like I said above, the only thing I noticed was that it settles and leaves a small air gap at the top of the walls. The gap varies in between each stub. A few spaces didnt have a gap at all. I also dont know how long it took to settle. I removed the walls about two years after they were build. But I've also seen settling in walls that use of regular insulation(pink stuff). I guess from condensation over time?? Maybe I didnt pack the some of spaces right? :lol: It was blown into existing walls throught a 4 inch hole cut into the drywall. I found out later that there is another technique of appling it where it is strayed on. Dont know if it works better.

Cellulose insulation is made from recycled paper that is applied as either loose fill into attics and closed wall cavities or damp-sprayed into open wall cavities.

Nuk, You must be careful whith such replies as your original one, not knowing EXACTLY what the OP refers to. Just assuming you talk about the same, because it sounds close, can confuse others. You are now referring to blown-in fibrous products (paper is made from wood or textile fibre). What is the OP referring to?