Install Attic Floor Over Blown Insulation: How-To

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Installing an attic floor over blown insulation is a great way to add extra storage space, improve energy efficiency, and increase the value of your home. This article will provide step-by-step instructions on how to properly install an attic floor over existing blown insulation.

It is important to note that you should have some basic knowledge of DIY projects before undertaking this task as it requires tools and materials that can be hazardous if used incorrectly.

Attic floors are one of the most popular DIY projects for homeowners looking to maximize their living space while also improving energy efficiency in their homes. The process involves covering the existing blown insulation with plywood or other decking material, then nailing it into place.

Installing an attic floor over existing blown insulation also helps keep any moisture out which can damage stored items in addition to providing additional R-value—the measure of thermal resistance used by building codes in determining how well buildings maintain warmth during colder months.

This article provides detailed information about installing an attic floor over existing blown insulation including what materials and tools are needed, safety tips for handling spray foam, and best practices for installation.

After reading this guide, readers should feel confident enough to begin working on this project themselves!

Choosing The Right Materials For Attic Flooring Installation

When considering attic flooring, a variety of materials are available. Homeowners should pay careful attention to the material they choose as it can affect insulation and energy efficiency ratings in the home. The most important factor when selecting materials is determining the proper R-value for the space.

Wooden boards or plywood sheets are often used as a flooring option due to their affordability, ease of installation and durability. However, they do not offer any additional insulation value unless an additional layer is added on top before installing the flooring.

Many homeowners opt for thicker wooden board options that provide more stability and noise reduction than other types of subflooring materials like linoleum or vinyl tile.

Plywood sheets with foam backing also make good choices for attic floors because they come pre-insulated with high R-values already embedded into them.

This eliminates the need for adding extra insulation on top of the wood before installation but may be more costly depending on where you purchase the product from. Additionally, these sheets are generally thinner than traditional plywood so they take up less space in attics where storage room might be limited.

The material chosen impacts how easy it will be to install and maintain the attic floor over time, so homeowners should select a material that fits both their budget and needs.

It is essential to properly assess your attic space beforehand to ensure there is enough room for adequate air circulation regardless of which type of material is installed.

Assessing And Preparing The Attic Space

Assessing the attic space is crucial to ensure a successful installation of insulation over the existing blown-in insulation. Before beginning, it’s important to check for signs of damage or water infiltration in the attic area.

Make sure to inspect all ceilings and walls, as well as any accessible ductwork, framing lumber and other structural components. Additionally, look into air leakage around wiring holes and plumbing vents that may have been sealed with caulk or spray foam previously.

Preparing the attic space is also essential before installing rigid foam insulation. Clear out any debris from the floor and make sure there are no obstructions such as furniture or stored items blocking access points where you will be working.

This should include removing old insulation if necessary; however, some types of insulation like fiberglass should not be tampered with due to their potential health hazard upon contact.

If dealing with an older home built before 1978, always use protective equipment when working with lead paint on surfaces within your workspace. After properly assessing and preparing the space for installation, it's time to begin insulating your attic using rigid foam insulation materials.

Installing Rigid Foam Insulation

Installing rigid foam insulation is the ideal way to upgrade attic insulation in an existing home. While it may seem like a daunting task, with the right know-how and preparation you can achieve great results:

  1. Measure your space before purchasing any materials.
  2. Prepare by ensuring that surfaces are clean, dry, and dust free.
  3. Have all tools on hand including protective gear such as gloves, goggles, and a mask before beginning installation of the rigid foam board insulation.

The type of material used for installing rigid foam board insulation depends on what is already present in the attic space; many times this will be fiberglass batts or cellulose blow-in material which must first be removed from the area prior to installing new rigid foam boards .

When measurements have been taken and supplies gathered, start at one end of the room working towards another wall where there is access to power outlets if needed for larger pieces of equipment such as saws or drills.

Cut each piece of rigid foam board according to measured size using box cutters or other appropriate cutting tool until entire perimeter has been covered with evenly sized foam boards.

Once done meticulously fasten each sheet into place using either nails, screws, adhesive strips or metal clips depending on manufacturer’s instructions included with product purchased.

Once installed correctly, rigid foam board insulation provides superior coverage compared to traditional types due to its increased resistance against heat transfer while still providing easy access when necessary areas need maintenance over time.

It also enhances energy efficiency throughout winter months saving homeowners money down line with lowered heating bills! With proper planning and execution installing attic flooring over blown insulation can make all these benefits possible without having worry about future repairs in years come!

Building A Raised Subfloor Over Insulation

Building a raised subfloor over insulation is an important step when installing an attic floor. This method helps to protect the insulation and provide structural support for the new flooring. To begin, measure the area of your attic that you plan on covering with a subfloor.

Once measurements are taken, cut pieces of plywood or OSB board to fit each section. The boards should be thick enough to hold up under weight and provide stability while walking across them.

Next, place the boards onto the existing insulation in the attic, taking care to make sure they are level and secure against one another. Using nails or screws, attach the boards together at their edges to create a solid surface for your raised-floor system.

It may also be necessary to add additional supports underneath depending on how much foot traffic will occur in this space.

Finally, check all seams between the newly installed subfloor panels for any gaps or weaknesses before moving forward with installation of the attic floor itself. If any adjustments need to be made it is best done now rather than after adding additional layers which could cause further issues down the line.

With these steps complete, you can move on to laying down your chosen material for use as an attic flooring solution.

Installing The Attic Floor

Installing the attic floor is a key step to ensuring proper insulation and protection from outside elements. The goal of this section is to provide information on how to install an attic floor over blown insulation, taking into account safety considerations, materials needed, and installation steps.

The following list outlines the supplies that are necessary for installing an attic floor:

  1. Attic Flooring Panels – Choose panels made of lightweight material such as plywood or OSB (oriented strand board).
  2. Joist Hangers – Necessary if joists are not present in your existing structure.
  3. Screws/Nails – Make sure they are appropriate for use with your chosen materials.
  4. Insulation Batting - Used to fill any gaps between panel joints or seams; buy according to R-value recommendations specific to your region.

Before beginning the actual installation process, it is essential that you take precautions and wear protective gear when working in the attic space due to potential hazards like airborne particles or sharp pieces of wood or metal.

Next, measure the area you intend to cover with flooring and cut accordingly, leaving some room for expansion during temperature changes throughout the year.

When attaching new joists, be sure that all connections are tight—nail or screw them securely together at each joint point and along their sides where they will meet walls or other structures in the room before adding support beams underneath them if possible.

Finally, place insulation batting between each panel joint then lay out your boards so they fit snugly against one another before nailing down in place with screws appropriate for your chosen material type.

It’s also important to remember that once installed, additional maintenance may be required depending on environmental conditions around the home such as humidity levels or extreme temperatures which could cause warping or cracking over time.

With these tips in mind, you can complete this project successfully while optimizing energy efficiency within your home’s attic space! To ensure long lasting results, next consider finishing touches and maintenance requirements for optimal performance going forward.

Finishing And Maintenance Considerations

Once the attic flooring has been installed over blown insulation, it is important to check for airtightness. Ensure that all seams and gaps between boards are sealed with caulk or foam sealant.

It may be necessary to add additional layers of felt paper beneath the attic flooring to further increase its durability and prevent moisture buildup underneath. Regularly inspect the attic floors for any signs of deterioration such as warping, cracking, or peeling due to moisture damage.

It is also important to clean up regularly in order to prevent dust accumulation on top of the attic flooring which can cause respiratory problems when inhaled.

Vacuum regularly using a HEPA filter-equipped vacuum cleaner and mop weekly with an appropriate cleaning solution designed specifically for wood floors. Additionally, use furniture pads under items that are placed upon the attic flooring in order to protect against scratches and dents.

Finally, take immediate action if there is any indication of water damage on the attic flooring such as discoloration, soft spots, or mold growth; remove damaged material immediately and replace with new planks if needed.

Following these maintenance tips will help ensure a long-lasting installation of your newly installed attic flooring overblown insulation.


The installation of an attic floor over blown insulation is a process that must be approached carefully, with attention to the right materials and methods. When done correctly, it can result in a strong and secure subfloor system that will last for years to come.

It's important to assess the current state of your attic space before beginning work, paying particular attention to the amount and condition of existing insulation.

With adequate rigid foam insulation installed beneath the raised subfloor structure, you'll have created a solid platform for laying down your new attic flooring. After ensuring that all components are properly secured, you may finish off by sealing seams or adding additional fasteners as desired.

By taking these steps and following best practices outlined here, any DIY enthusiast should be able to complete this project with confidence.

In addition to providing a safe environment for storage or other activities above your ceiling line, having an expertly-installed attic floor will also add value to your home now and well into the future.

As long as one remains vigilant about maintenance tasks such as regularly checking for signs of wear or damage, their hard work should pay off handsomely—toastworthy even!

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