How to Make Sure Cellulose Insulation is Dense Packed

posted in: Insulation | 73

Home Energy Magazine | The Dry-Pack Cellulose Alternative:

One of the key components of a successful dense pack installation is a powerful enough blower. Bill Hulstrunk, technical manager of National Fiber Cellulose, recommends a pressure of no less than 80 water column inches (80 inches WC, or 2.9 psi), measured at the blower outlet while blowing air and not material. These numbers seem to be appropriate, based on follow-up tests that Hulstrunk and I conducted with a calibrated cavity test box. Packing this test box of known weight and volume can reveal the net added weight of cellulose per cubic foot. Inspectors have yet to see a blowing machine that can reach 80 inches WC and can’t achieve a standard 3.5 lb of cellulose per cubic foot. The blowers that can’t generate the necessary pressure can’t pack the cellulose to the optimal density. Also, blowing equipment that blows with enough pressure to dense pack the cellulose is easier and faster to work with. The cavity fills quickly and to the proper density.

There are a number of reasons for the lackluster densities. They include

  1. old, undersized, or otherwise under performing blower motors;
  2. failure to maintain equipment, especially worn seals (when air can bypass worn seals, less pressure is available on the outlet side);
  3. inadequate power due to low voltage or small-gauge wire;
  4. a flawed air-material ratio (decreasing material feed and/or increasing blower air setting results in higher density); and
  5. poor installer technique—including withdrawing the wall tube too quickly or not using a wall tube at all.

Consistent dense-pack is a readily obtainable and worthy goal, but ongoing testing indicates that it doesn’t happen by accident. The following recommendations will greatly increase the likelihood of getting consistent dense-pack results:

  1. Use an infrared thermal imager for quality control inspection.
  2. Conduct equipment pressure-testing on a regular basis, supplemented by the appropriate ongoing maintenance program.
  3. Train field crews with a calibrated test box to ensure that they have the right air-material ratio and installation technique.

Improvements in cellulose manufacture, advances in blowing equipment, and access to infrared cameras are moving the weatherization industry in a positive direction. For years we had to endure stories from homeowners who had remodeled their bathroom, only to find that their blown-in insulation had “settled.” This led to the notion that cellulose settles more and more as time goes on. We now know that much of this cellulose was never dense-packed to begin with, and much of the “settling” had already taken place before the contractor’s truck pulled out of the driveway. Fortunately, we now know how to avoid it.

73 Responses

  1. Title

    […]we prefer to honor a lot of other online web-sites around the net, even if they aren’t linked to us, by linking to them. Underneath are some webpages worth checking out[…]

  2. Wikia

    Wika linked to this place

  3. Digg

    While checking out DIGG today I noticed this

  4. Title

    […]below you will discover the link to some internet sites that we feel you need to visit[…]

  5. Looking around

    I like to browse around the internet, regularly I will just go to Digg and follow thru

  6. Title

    […]check beneath, are some completely unrelated sites to ours, even so, they are most trustworthy sources that we use[…]

  7. Title

    […]Sites of interest we’ve a link to[…]

  8. Wikia

    Wika linked to this website

  9. Wikia

    Wika linked to this site

  10. News info

    I was reading the news and I saw this really interesting info

  11. Tumblr article

    I saw someone writing about this on Tumblr and it linked to

  12. Digg

    While checking out DIGG yesterday I found this

  13. Digg

    While checking out DIGG today I noticed this

  14. Digg

    While checking out DIGG yesterday I noticed this

  15. Yahoo results

    While searching Yahoo I found this page in the results and I didn’t think it fit

  16. Digg

    While checking out DIGG today I noticed this

  17. Informative and precise

    Its hard to find informative and accurate information but here I found

  18. Yahoo results

    While searching Yahoo I discovered this page in the results and I didn’t think it fit

  19. Tumblr article

    I saw a writer writing about this on Tumblr and it linked to

  20. Title

    […]although internet websites we backlink to beneath are considerably not connected to ours, we really feel they’re truly worth a go through, so have a look[…]

  21. Title

    […]check below, are some absolutely unrelated internet websites to ours, on the other hand, they may be most trustworthy sources that we use[…]

  22. Informative and precise

    Its hard to find informative and accurate information but here I noted

  23. Title

    […]Every as soon as in a while we opt for blogs that we study. Listed below would be the most recent sites that we choose […]

  24. Title

    […]Here are some of the websites we advise for our visitors[…]

  25. Tumblr article

    I saw someone writing about this on Tumblr and it linked to

  26. Title

    […]very few web-sites that happen to become comprehensive below, from our point of view are undoubtedly nicely worth checking out[…]

  27. Wikia

    Wika linked to this place

  28. Its hard to find good help

    I am forever proclaiming that its hard to find good help, but here is

  29. Its hard to find good help

    I am forever saying that its difficult to find good help, but here is

  30. Title

    […]please take a look at the web-sites we adhere to, like this one, as it represents our picks in the web[…]

  31. Its hard to find good help

    I am regularly saying that its difficult to procure quality help, but here is

  32. Wikia

    Wika linked to this website

  33. Digg

    While checking out DIGG today I found this

  34. Just Browsing

    While I was browsing today I saw a excellent post concerning

  35. Dreary Day

    It was a dreary day here yesterday, so I just took to messing around online and found

  36. Title

    […]just beneath, are various absolutely not associated web sites to ours, nevertheless, they’re surely worth going over[…]

  37. Digg

    While checking out DIGG yesterday I noticed this

  38. Tumblr article

    I saw a writer talking about this on Tumblr and it linked to

  39. Just Browsing

    While I was browsing today I noticed a great article concerning

  40. Dreary Day

    It was a dreary day here yesterday, so I just took to messing around online and realized

  41. Yahoo results

    While searching Yahoo I found this page in the results and I didn’t think it fit

  42. Yahoo results

    While browsing Yahoo I found this page in the results and I didn’t think it fit

  43. Title

    […]although internet websites we backlink to below are considerably not associated to ours, we feel they’re really really worth a go by way of, so have a look[…]

  44. Title

    […]that could be the finish of this report. Here you’ll come across some internet sites that we assume you will enjoy, just click the links over[…]

  45. Just Browsing

    While I was surfing today I saw a excellent post concerning

  46. Informative and precise

    Its hard to find informative and accurate info but here I noted

  47. Title

    […]we came across a cool website that you simply may possibly delight in. Take a look in the event you want[…]

  48. Informative and precise

    Its difficult to find informative and precise information but here I found

  49. Digg

    While checking out DIGG today I found this

  50. Wikia

    Wika linked to this website

  51. Yahoo results

    While searching Yahoo I found this page in the results and I didn’t think it fit

  52. Looking around

    I like to browse in various places on the online world, often I will go to Stumble Upon and read and check stuff out

  53. Just Browsing

    While I was browsing yesterday I noticed a great article about

  54. Title

    […]Wonderful story, reckoned we could combine several unrelated information, nevertheless seriously really worth taking a appear, whoa did one learn about Mid East has got additional problerms too […]

  55. Tumblr article

    I saw someone talking about this on Tumblr and it linked to

  56. Title

    […]check beneath, are some totally unrelated sites to ours, on the other hand, they are most trustworthy sources that we use[…]

  57. Tumblr article

    I saw someone writing about this on Tumblr and it linked to

  58. Digg

    While checking out DIGG today I noticed this

  59. Title

    […]we came across a cool site that you simply may well delight in. Take a appear when you want[…]

  60. Yahoo results

    While browsing Yahoo I found this page in the results and I didn’t think it fit

  61. Just Browsing

    While I was browsing today I noticed a excellent article about

  62. Tumblr article

    I saw a writer talking about this on Tumblr and it linked to

  63. News info

    I was reading the news and I saw this really cool topic

  64. News info

    I was reading the news and I saw this really interesting info

  65. News info

    I was reading the news and I saw this really cool info

  66. Title

    […]please go to the web-sites we follow, which includes this 1, because it represents our picks through the web[…]

  67. Title

    […]just beneath, are numerous totally not related web pages to ours, having said that, they’re certainly really worth going over[…]

  68. Title

    […]although web sites we backlink to beneath are considerably not connected to ours, we really feel they’re really worth a go by, so have a look[…]

  69. News info

    I was reading the news and I saw this really interesting topic

  70. Wikia

    Wika linked to this website

  71. Title

    […]although web-sites we backlink to below are considerably not related to ours, we really feel they are in fact really worth a go through, so have a look[…]

  72. Title

    […]we came across a cool web page that you simply may well get pleasure from. Take a search for those who want[…]

  73. Title

    […]Sites of interest we have a link to[…]

Leave a Reply