WEIGHT OF CELLULOSE INSULATION BLOWN-IN OVER …
WEIGHT OF CELLULOSE INSULATION BLOWN-IN OVER SHEETROCK
|QUESTION FROM CHERYL TRAVIS IN KNOXVILLE, KY: | ANSWER FROM THE INSULATION DOCTOR: |
| |[pic]Regarding your question about the weight of the cellulose on 24" trusses, |
|We want to add insulation to our attic, and are considering cellulose. However |the weight should not be a problem in this application. You stated that you |
|the ceiling trusses are on 24" centers and the ceiling sheetrock is only nailed |would like to increase your R-value to R-38. Your current R-value with the |
|to the truss. (The house was built in 1965.). There is currently about 2.5 |2-1/2" of cellulose is approximately R-8. Therefore, you would need to add an |
|inches of cellulose in the attic and we would like to get the R-value to R-39. |R-30. This would be adding approximately 8-1/4". The weight ratio per square |
|Is it likely that the added weight of the new cellulose would cause the ceiling |foot of 8-1/2" of cellulose is usually .97 pounds per square foot. This should |
|to sag? |not cause a problem. |
| | |
| |I would recommend adding an R-40 which would bring you to the maxiumum |
| |insulation and the point of diminishing returns on your investment. An R-40 |
| |would be 11.15" with a rate ratio of approximately 1.29 per square foot. (If |
| |your drywall has been properly installed, which is glued and screwed, it is |
| |capable of carrying a weight load of approximately 2 lbs). |
| | |
| |Note: You also will want to add baffles for ventilation inside the attic and |
| |beware of walking on the trusses and putting all your weight on one truss. It |
| |is imperative that you distribute yours or the installers weightload on more |
| |than one truss at a time. This can be accomplished by sliding a few boards into|
| |the attic and walking on them. You will need to be careful not to approach the |
| |end of any board or it will flip and maybe cause you to fall through the |
| |ceiling. |
|CONTINUED QUESTION: |ANSWER FROM THE INSULATION DOCTOR: |
| | |
|Thanks for the information below, but the specs for my application are a little |In response to your question regarding the 1/2" sheet rock and the weight of the|
|different. |cellulose insulation. 1/2" sheet rock on a 24" on-center trussed ceiling is |
|The house was built around 1965 and the sheetrock seems to have been nailed |considered standard by today's building standards. The fact that the sheet rock|
|rather than screwed & glued. I'm assuming it is 1/2 sheetrock. |is not screwed may not be relevant to any significant difference in the weight |
|This means the weight load capacity is lower than the 2.2 lb per sq. foot listed|load. More than likely your sheet rock was installed with more nails AND |
|below. |GLUE. In that era, glue was always used. The advantage in today's method of |
|Assuming 1/2 sheetrock nailed* on joists on 24 inch centers, What would the |screwing the sheet rock is that it requires fewer fasteners. |
|weight load capacity be? | |
| |If you are still concerned with the weight load, you have the option to consider|
| |installing blown-in fiberglas insulation. For example, an R-30 fiberglas |
| |weightload per square foot is .531 or an R-40 the weightload would be under |
| |.786. This is considerably less weight. |
| | |
| |Bruce Jones |
| |The Insulation Doctor |
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