Why Proper Insulation Installation Matters

Insulation is an unseen, unsung hero in a home. It keeps you warm in the winter and cool in the summer, and proper insulation keeps energy costs down. Getting the right R-value for the job is definitely an important piece of the puzzle, because different climates have different requirements. 

But that’s only one component of the overall picture. Proper installation is key. If insulation is poorly or improperly installed, it can have big consequences. Read on about why proper installation is important, the issues that can crop up and how to avoid them.

Improper installation of insulation products can render them less effective or efficient, negating their existence. Problems include:

• Moisture issues, including potential mold growth. Gaps in insulation batts can allow moisture to condense on cold surfaces. While fiberglass insulation itself does not rot or mildew, gaps can lead to wood rot or mold growth in a wood substrate.
• Reduced energy efficiency. Whether from gaps or compression of insulation, improper installation can prevent the insulation from creating a continuous thermal barrier. This allows heat to enter in the summer or escape in the winter, forcing the HVAC systems to work harder. This leads to higher energy bills.
• Hot or cold spots and drafts. Gaps and compressed areas of insulation can create uneven temperatures in a building.
• Fire hazards. Installing insulation too closely to heat sources, such as recessed lighting, can create a fire hazard.

To avoid these issues, hire a reputable insulation contractor, or be sure to follow manufacturer instructions if you’re doing the work yourself. Consider these installation tips:

• Avoid compression or overfilling. The effectiveness of insulation is reduced when it’s compressed, and more insulation than necessary provides little to no additional benefits, while costing more.
• Consider seals and air barriers. A properly sealed home or building minimizes air infiltration and moisture problems, working in tandem with insulation for energy efficiency and comfort.
• Fill all gaps. Appropriately sized batts should be used, with pieces cut to size to fill small gaps.
• Properly insulate everywhere. When insulating behind wiring or around electrical boxes, avoid gaps and potential fire hazards. 
• Watch JM’s series of videos featuring installation guides and tips.

Not sure how much insulation you need for your project? We can help! With Johns Manville’s insulation calculator you’ll answer a few quick questions and then get recommendations and info on where to buy. And check out answers to FAQs, learn about Inflation Reduction Act tax credits and more on our homeowner insulation page.