i think TCL is the only one for cellulose unless someone else is doing it now too. they are pretty good. if you can afford it i suggest you do both - cellulose insulation for the ceiling and coolbat or similar foil for the roof. in combination you'll have a great reduction of heat for the house. i did it and this allows me to AC the entire house for around 0,15 KWh per month and sqft.

ozak,

since its blown into the space to form a uniform layer i'd say most likely yes. but it will depend on the actual layout of the space in question. you could check with TCL and request a site visit.

philipcs,

i think i paid somewhere around 2,XX per sqft for the cellulose. the foil i bought from a hardware store and got installed when my contractor took down the roof and reenforced trusses etc. so i got the installation FOC. if the roof is in place you can most likely install it from inside the roof but you might have a hard time to cover the entire roof properly. the trick is basically to cover all the way because then you create a barrier for the hot air and when you have openings at both sides the natural draft (and whatever wind you may have) will help to continously carry out hot air before it gets into you actual roof. so the cellulose has less heat to shield of. also you should not cover the cellulose so air can circulate and transport heat (and moisture - beware of the dew point!) away.

weikee,

actually - you can easily move the cellulose to access any pipes you might need to. just put the flakes back afterwards. been there done that. it's a bit messy but not a huge issue. it does help if you know where to look for the cables and such. if your electriction (or plumber) did a proper layout to beginn with it's not much of a hassle.

ballasts are a problem - if their under the insulation they can get too hot and will blow.

if you have a leakage your ceiling also will have issues. the cellulose should however not get moldy cause it *should* be treated. the one from TCL is. some el-cheapo flakes from china might just not be properly done. afterall even though you essentially place old newspaper in the roof it's not that simple

if you dont create a seamless cover of cellulose you will create heat-spots and if your house is a/c-ed 24/7 there would be a risk of dew points between the cellulose and the ceiling (aka asking for mold growth) right? at least my calculations for the insulation and my real-life readings indicate that the dew point is a thing easily overlooked but lurking across anyone head who is insulating the house in malaysia.

philipcs,

you can move them no problem. can also move back later. they form a uniform layer that can be broken anytime. just be slow and you dont create much dust. but for sure there will be dust. it stays in the roof though.

as for water: cellulose is paper. so go figure. same goes for any insulation. water would probably seep through to the bottom and then inside the ceiling rather quickly (its not a sponge lah). never tried it though, it's my assumption. you could ask TCL or ask for demonstration with a sample of the cellulose on top of a cut off board and then pour a glass of water on it. then you know. dont think they will mind - very friendly and accomodating ppl.

gor supplier? website? for coolpu zinc roofing. wanna see - might be good for secondary shielding.