We take a look at a house that has both blown cellulose and fiberglass insulation.
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Saturday, August 7th, 2010 at 12:02 pm
Insulation: Blown Cellulose Vs. Fiberglass
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25 Responses to “Insulation: Blown Cellulose Vs. Fiberglass”
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@anotherheist
The reality is Blown in BLanket according to industry standards gives you an R4. 1 per Inch making a 2X4 which 3. 5/8″ R15 and Cellulose at 3. 7 per inch a R14 this documented
@coast2co blown fbg has an r2. 2 to 2. 6 and cellulose is a 3. 7 ish, plus fbg isnt a dense product so it doesnt stop all air movement in the walls like cellulose, i blow both products for over 20 years now and cellulose is much better when installed right, just my opinion,ur not talking about teh cubed stuff are you?tht stffi junk
@coast2co I wholeheartedly agree that research is critical when making an insulation choice. I have never used blown fiberglass and cannot say that it’s performance is better or worse that cellulose. I haven’t even compared the price point. Check with your insulation professional when bidding out your home. Ask for their recommendations and reasons to go one way or the other.
@coast2co I think its important to note blown fiberglass is another good product that can fill the cavity fully. I didn’t think that I ever said anything close to “blown fiberglass is no good. ” Did I? My point was, and still is that the use of blown cellulose vs fiberglass batts is advantageous. You get a fuller cavity and less gaps and voids using cellulose than with fiberglass batts. There is nothing misleading about the video. I would advocate using blown fiberglass over batts any day.
This Video is misrepresenting concerning Fiberglass. Should I say misleading people. If you install the Blow In Blanket method with Fiberglass it eliminates all air from the cavity as well. , Plus the R Value is greater with Fiberglass in BIBS Blow In Blanket method. Research it.
Vapour barrier is a condensation maker (mold creator) in most places of the country. Also misleading if you install Blown in Blanket system with fiberglass you get the same complete wall fill and a R15 in 2X4 and a R23 in a 2×6
Please watch “The Fansulator” seach Fansulator on youtube. Its a kit to insulate your whole house fan and works year round!
@tivathehusky contrary to your opinion knob and tube is generally safe- and is a good system by design. Most problems arise from inexperienced people modifying the circuits eg stripping the sheath and leaving it exposed. If your wires are really getting hot enough to burn the house down- take the penny out of your fuse box you are trying to run too much crap on the circuit.
@tivathehusky I was looking for Roxul’s Safe N Sound product after seeing it used extensively on HGTV. . . but I understand it is available only in Canada. Sigh.
For a couple of recent attic insulation retrofits, I used Green Fiber blow-in cellulose product that I bought at Lowes. YMMV.
@zipacna1980 No vapor barrier is put on the interior. Because the exterior is wrapped and stuccoed and sometimes even sheared, if the interior had a vapor barrier it would lead to potential moisture trap in the walls, there would be no indication on the sheetrock because they would be seperated from the moisture. it could spread unnoticed for months or years and really be a problem.
Where is a vapour barrier?
No problem. Roxul is a rockwool product and its non-combustible(commercial fire resistance ratings). They also make a sound batt.
You can also buy insulation made out of recycled jeans, batt or blown.
And spray foam is the obvious best, other than it’s off-gassing.
And on a rural property, I would most certainly consider strawbales.
cheers
Thanks for the input. Good information.
Your English is excellent, My “anything other than English” requires the apology. Thanks again for watching and for the excellent information.
i live in norway. . arctic circle 70degre north
i think. . we buy rockwool in batts. glava fiberglass batts is the one most people buy in norway. . most new norwegian wood houses have 15-25cm cross lain insulation in walls and 30-40cm cross lain insulation in roof. . sorry for my bad english. .
Excellent points. I have never used rockwool on a project. What regions of the country is it commonly used?
worst fiberglass insulation job I have ever seen. . you get almost no caveties with fiberglass if you know what your doing. . if it isnt a perfect job it will fall down in walls over time. . rockwool easier to work with and more fire proof. . but insulate less.
I ate fiberglass insulation. It wasn’t cotton candy like the guy said. . . my tummy itches.
AHAHAH. . . he says cuttose (im not sure if thats how you spell the word) to the contractor then starts naming off more mistakes made by the contractor ahaha
Does anyone know how much this stuff costs for material and installation? Per square foot of wall?
The boric acid also makes it rodent proof as well, a problem with fiberglass, rock wool is still the best for all purposes and climates and the most fire proof by far
looks like its not in a cold climate so they dont need a vapor barriar thats why they used unfaced on ceiling too
Cellulose insulation has a product mixed into it called Boric Acid. this is a fire proof material its a natrual item which is mined here in the US. Since the Cellulose is made out of paper it would of burned very fast thats why they mix it in and the Boric Acid makes it a fire proof material it does not burn. on the other hand Fiberglass insulation doesnt burn but it melts away from fire. “arossona” commented no oxygen no fire he has a point there but with out the Boric Acid the house will burn
Worst batt job I have ever seen. . . . WOW. . . . and blown in cellulose kicks ass. . . . anything you can batt I can blow. . . . . why no poly on this job???
knob and tube is just a fire hazard all around. Replace it ASAP. Most insurance companies wont insure people if they buy a property with any knob and tube wiring in it.
Insullation will slow the effects of fire, but these wires get hot, and stay hot, so a fire can smolder till it finally ignites.
In Canada, there is a product, Roxul. . . which is non-combustible. If you spend any money at all, update the wiring.