After reading tons here, I think it's best I start a thread to get answers to questions that I'll have in order to make sure I don't make any mistakes along the way that I'll regret later. It's amazing the wealth of information, sound advice, and support there is on avsforum. Hopefully this build thread will help someone else in the future as other threads before this one have helped me.
I'm building a multipurpose media room and bar for watching mostly TV and Movies as well as general entertaining. It's a 400 sq ft L shaped room where the larger space is for AV and the rest is for the bar. This is in a portion of the basement of a house built in 1962. It's a wood framed construction with 2x4 walls 16" OC and 2x8 joists 16" OC, and is almost 4' below grade.
Here's the layout:
Here's some pics of the room pre demo:
Standing at the entrance facing the screen wall:
opposite end of the room looking back at the entrance:
same spot looking over to the old bar.... just a little retro
I've since had this post removed and a Parallam beam installed to carry the load for an open concept space
-Sufficiently soundproofed between floors so that for now the kid remains asleep in an above bedroom. And later- that the wife and I don't wake up when the kids are down there with friends.
-Utilize highest return on investment soundproofing techniques. ie, building a room within a room isn't an option
-Video: I will be running a 63" Plasma and a Projector and a 106" motorized screen setup
-Audio, I've wired for 9.2 for Front Highs as the L shape makes a Front Wide Right just about impossible, but this is not a dedicated HT anyway, so the extra speakers are really more for the heck of it than trying to achieve good 9.2...
-Not a dedicated theater room; it must be multipurpose and there will be concessions made on finishing materials to satisfy wife's aesthetics requirements
-Funds are limited, but I don't have a fixed budget either. Savings for this room come oh so slowly, so to build an amazing room would take an amazing amount of time. I'm not sure I want to wait to go deaf and blind before completing the room!
-91" Ceiling height rough, 7'4" est finished height-Support beam between media and bar area is 9 3/4" tall, thus reducing ceiling of the soffit containing it and the duct trunk to 83" rough, 6'6" est finished height
-Projector must be near opposite wall 20' away and not mid ceiling
-2 6x2.5' Windows on west wall
-4x3' window and exterior door on east wall
-Fixed layout (plumbing and electrical are done)
-8x8" square opening on exterior wall necessary for water pressure regulator and outside spigot shutoff access.
-Must have pot lights - 15 of them!
-All DIY (except mudding and taping)
Current Soundproofing plan
-Insulation in all joist and wall cavities
-5/8" Drywall + 1.5 tubes Green Glue/sheet + 5/8" Drywall on all ceilings and source side walls
-1.5 tubes of GG/sheet and 1/2" drywall added within stud wall cavities to receiving side of interior (mimicing soundproofingcompany.com's SPC Ceiling Solution 4)
-Clips and Hat channel on ceiling, soffit, and interior walls that are not double studded-GG SilenSeal all drywall perimeter joints, electrical box perforations, pot light perforations
-Gardner Bender Duct Seal on electrical boxes for outlets, switches, and bar pendant lights, as well as conduit run perforations
-build backer boxes for the 15 pot lights, and the in-ceiling motorized screen
-Door to room is a Masonite Safe and Sound 1 3/4" solid core door with a sweep. It's in a kerfed and weatherstripped frame and already installed.
Ceilings -IB-1 Clips and Channel, 5/8 DD&GG
Soffit for HVAC-IB-2 EXT Clips and Channel, 5/8 DD&GG
Wall 1 - Screen Wall with plasma mount recess / Bar cabinets and counter-Double Stud wall, 5/8 DD&GG
Wall 2 - East bar wall - window and exterior door-Clip and Channel, 5/8 DD&GG
Wall 3 - South bar wall-IB-1 Clips and Channel, recessed between studs, 5/8 DD&GG
Wall 4 - East Media room wall-IB-1 Clips and Channel, 5/8 DD&GG
Wall 5 - South Media room wall / Staircase wall-Double Stud wall decoupled with IB-3 brackets to joist blocking, 5/8 DD&GG
Wall 6 - West Media room wall - windows-Double Stud wall, 5/8DD&GG
has really educated me a ton this week. My soundproofing plan has come a long way from just insulating with Roxul Safe and Sound and using Resilient Channel and single 5/8 drywall on the ceilings and walls. WOW is this site informative! I can't express my appreciation for it enough.
I have Roxul thermal insulation in all my exterior walls. However, with a second wall framed in front of my foundation, I can use something else for the next layer of insulation. Ted White has said numerous times here that the fluffy pink stuff is best value wise, and that insulation is the least important factor of the 4 factors to soundproofing. I don't like working with the pink stuff, however I've priced out some soft and friendly R12 Knauf at 33.27 a 127 sq ft bag or 26
cents/ sq ft. and R14 Knauf at 31.45 a 78 sq ft bag or 40
cents/ sq ft. from a local drywall supplier, Dryco http://www.knaufinsulation.ca/en/con...batt-glasswool
so these are cheaper than Owens Corning at 65
cents/ sq ft. http://www.homedepot.ca/product/r-14...783-sq-/905969
and Roxul at 59
cents/ sq ft. from Home Depot:
Comparing the products isn't the easiest considering it's difficult to compare like for like, so this is what I'm looking at. The Roxul S&S claims a 0.52 absorption coefficient at 125hz and an STC of 52 with 5/8 drywall both sides on steel studs 24" OC http://www.roxul.com/files/RX-NA_EN/pdf/SafenSound.pdf
Owens Corning claims 49 STC with fiberglass and 47 with rock wool with 5/8 drywall both sides on steel studs 16" OC. http://insulation.owenscorning.ca/as...9419cdbb54.pdf
Knauf claims 50 STC on 3 5/8 steel studs, no spacing specified:http://www.knaufinsulation.ca/sites/...0datasheet.pdf
Absorption coefficients at lower frequencies interest me more than STC, but even bobgolds.com's aborption coefficients make it difficult to compare across brands with ever changing product names...Analysis paralysis! I think I'll just trust Ted, and go buy the Knauf fiberglass since it's the cheapest option.