Man carrying a roll of attic insulation

How To Install Roll Insulation In The Attic: A Comprehensive Guide


Want to save money and conserve energy? Here’s how to boost your home’s energy efficiency; one of the most effective measures you can take is properly insulating your attic. You might be wondering, How do you install roll insulation in the attic? Installing roll insulation, or batt insulation, is a straightforward technical process that can significantly improve your home’s thermal performance. Let’s walk through the steps to ensure you get it right, keeping your home cozy and your energy bills low.


Understanding Roll Insulation

Roll insulation comes in long, flexible blankets of insulating material, typically fiberglass or mineral wool. It’s designed to fit snugly between the joists and rafters in your attic, providing a continuous thermal barrier. Before we dive into the installation process, remember that proper installation is key to maximizing the effectiveness of your insulation.


Step-by-Step Installation Guide

1. Preparation

Safety First: Wear protective gear, including gloves, a long-sleeved shirt, pants, a dust mask, and safety goggles.

Clear the Space: Ensure the attic is clean and clear of any debris or old insulation that needs removal.

Measure: Determine the square footage of your attic to purchase the correct amount of insulation. Remember to consider the R-value recommended for your climate zone.

2. Starting the Installation

Begin at the Farthest Point: Start installing from the far end of the attic and work your way back towards the entrance to avoid compressing the insulation as you go.

Fit Between Joists: Roll out the insulation between the joists, ensuring it lays flat. The insulation should fit snugly but not be compressed, as this can reduce its effectiveness.

3. Cutting to Fit

Measure and Cut: When you reach an obstacle or the end of a row, measure and cut the insulation to the proper size to fit the space using a utility knife. It’s best to cut the insulation on a flat, stable surface.

Fill Gaps: Ensure there are no gaps between sections. Small gaps can be filled with leftover pieces of insulation.

4. Addressing Obstacles

Work Around Obstacles: When you encounter obstacles like ducts or electrical boxes, carefully cut the insulation to fit around them. Avoid compressing the insulation or leaving gaps.

5. Layering

  • Adding Layers: In colder climates, you might need more insulation than a single layer between the joists can provide. If so, lay a second layer perpendicular to the first to cover the joists and reduce thermal bridging.


Key Considerations

  • Ventilation: Don’t block soffit vents with insulation. Proper attic ventilation is crucial to prevent moisture buildup and related issues.
  • Vapor Barrier: If your roll insulation comes with a vapor barrier (facing), it should face the interior of the home. This is especially important in colder climates to prevent moisture from entering the insulation.
  • Sealing Air Leaks: Before installing new insulation, seal any air leaks in the attic floor. This will enhance the overall performance of your insulation.


Key Takeaways

  • Proper preparation and safety measures are crucial before starting the installation process.
  • The insulation should fit snugly between joists without being compressed.
  • Ensure the attic remains well-ventilated and address any air leaks for optimal performance.
  • Consider the climate-specific R-value recommendations to choose the appropriate insulation thickness.


Installing roll insulation in your attic is a cost-effective way to improve your home’s or business’s energy efficiency and comfort. By following these steps, you can ensure the job is done correctly, providing lasting benefits. Remember, the key to effective insulation is not just the material but also the quality of the installation.



This blog post is for informational purposes only and provides a general guide on installing roll insulation in the attic. Due to the variability in home designs and local building codes, it’s recommended to consult with a licensed, reputable, and experienced insulation contractor in your area to ensure the best approach for your specific situation.


Need expert advice or professional installation services for your attic insulation? Don’t hesitate to call us for more information and tailored solutions that meet your home’s needs.