basiclly is there any reason this won't work?
That depends on your definition of "work".
I'm thinking of making some traps from stuff found at home depot cause it's what i have to work with.
If you are referring to "bass" traps...yes, there IS a reason why they won't work. Its very simple.
1. There is no access to the face of the fiberglass. Most molecular velocity is reflected by the rigid shell. What is absorbed THROUGH the shell MAY be absorbed SOMEWHAT by the compressed fiberglass. However, the density of this fiberglass is nowhere near that of manufactured rigid fiberglass. Absorption occurs because of this density. Gas flow is restricted through the INTERSTICES of the fibers, which causes FRICTION. This friction is the procees that makes "absorption" occur.
2. Low frequencys will simply defract around them as their wavelengths are MUCH longer than the diameter of the shell. You may achieve a modicum of diffusion of those frequencys whose wavelengths are SMALLER than the diameter of the shell. However, this has no bearing on the success of these units as "bass traps".
REAL Tube Traps, as manufactured by Acoustic Sciences Corp. are built of EXPENSIVE 4"thick 12-16" diameteter rings of OC703, which are glued together to form a "tube". 3/4"thick MDF discs are then glued to the ends. This assembly is then wrapped with a rigid wire screen, which is staple to the ends. A strechable fabric "tube" is then pulled over the assembly, stapled to the ends, and then FINISH ends are fastened...voila.. a tube trap. I've personally visited their factory and was allowed to view them building one.
I'd submit, you a gambling with your time and money. . Is the results worth the effort and expense? I would submit...no.
I WOULD suggest..if anything, cut a couple of MDF/Plywood discs at your chosen diameter. Form a rigid wire screen "tube" with a diameter the same as the discs with the length as tall as the screen is wide. Slip one disc into the end of the wire tube and fasten it with whatever you have. Fill this tube with your R? fiberglass and compress till you no longer can compress any more into it. Slip the other end in and fasten it. Then take a piece of STRETCHABLE fabric with a length 4" longer than the tube and a width equal to the circumference of the tube plus 2". Fold this fabric OUTSIDE IN, and sew the length, leaving about 1 1/4" of fabric past the sewing line. Once sewed, turn this INSIDE OUT, and stretch over the tube. Now you should have about 2" of material to bend over the top edge of the discs and staple it. Cut a couple more discs about a 1/2" or 1" bigger, or even the same size. Prefinish these and then fasten to the ends. VOILA! A tube trap that may actually do something.
Furthermore, you COULD cut those cardboard forms in half...lengthwise, and form you discs and screen to the same diameter. Staple one of the discs to the HALF ROUND tubes, wrap wire around this assembly, stuff, fasten the other end and cover with fabric and finish ends. Place in a corner allowing about 4" of airgap to the corner, with the the FACE of the half round cardboard to the room. Reflections off the corner(low frequencies terminate in corners, will now go THROUGH the fiberglass, and then be reflected again via the cardboard halfround back through the fiberglass...again, and again.(At least thats the theory! Have fun and good luck.
fitZ