How Ventilation & Insulation Prevent Mold Growth


Ventilation and insulation always go hand in hand. Together, they keep mold from forming in your attic. 

Ventilation and Insulation

Bone Dry Roofing – West, your trusted roofer, explains how below: 

How Ventilation & Insulation Prevent Mold 

Mold needs three things to grow: humidity, high temperatures and biodegradable material. Proper ventilation and insulation prevent mold by managing the first two factors: humidity and high temperatures. Adequate ventilation lowers indoor humidity levels by removing warm, humid air from your house, while insulation keeps indoor temperatures low to prevent air from reaching dew point temperatures and condensing into droplets. 

By preventing warm, humid air from condensing into droplets, adequate ventilation will also ensure that your insulation doesn’t lose its R-value (R-value indicates your insulation’s ability to prevent heat transfer). When insulation gets wet, it can lose up to 40 percent of its R-value. 

How Much Ventilation & Insulation Does Your Attic Need? 

As a general rule, there should be one square foot of ventilation for every 300 square feet of ceiling space in attics with a vapor barrier. But for attics without a vapor barrier, there needs to be one square foot of ventilation for every 150 square feet. As for insulation, most contractors would recommend installing insulation with an R-value of 38. 

Keep in mind that different types of insulation have different R-values and are only suited for certain types of applications. For instance, if you’re adding insulation to your attic, loose-fill and sprayed foam insulation are great for unfinished attic floors and new wall cavities. The same goes for air vents: not all vent types can provide the same level of ventilation. 

To learn more about your insulation and vent options, consult a local roofing contractor. Since they’re more familiar with the local climate and building codes, they can make better recommendations. 

Bone Dry Roofing – West offers a wide range of professional roofing services. Call (970) 364-7996 or fill out our contact form to schedule an inspection. 




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Working with Bone Dry Roofing was best decision I made to deal with a leak in my roof. They took their time to correctly determine where the leak was coming from and the best way to fix it! And, they did! Everyone I worked with from their staff was awesome! I will definitely use them again!!
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Initially called this company for a quote because I saw their truck in Denver and the driver used their blinker. Compared to 2 other roofing companies their quote was in the middle and was later adjusted for less materials being used than expected. After signing the contract they were ready to start the next week on a garage roof and home roof repair (weather permitting). The team was respectful of our home & our neighbor’s. Throughout the entire process the communication was great. Highly recommend!
We are so happy with the service we received from Bone Dry Roofing! Nick came out quickly and did an inspection and a quick estimate for us! The repairs were done quickly! Fernando did an amazing job! He was very friendly. We have a very pitched roof and so I was very impressed with his bravery. ( would not catch me up there ever)<br /> <br /> Very happy customer and highly recommend!
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