If you haven’t insulated your roof yet, you should read this article. This article will discuss Extruded polystyrene (EPS) insulation, Spray foam, Fiberglass, and Foil-faced batts. It will also tell you how to install a new attic hatch or door. Read on for tips to make your project as easy as possible. If you don’t want to open your attic hatch, install blocking around the door and hatch.

How to Insulate Roof Without Attic

Extruded polystyrene

Extruded polystyrene, or XPS, is made by a process called extrusion. This process creates a mold that holds tiny foam beads. Stone wool insulation is another alternative. This material is made by dissolving basalt and rock into fibers and then being compressed into plates and tubes. It is commonly used for commercial buildings and roofs without attics.

Fiberglass insulation gets its R-value from the air trapped between the fibers. However, if the fiberglass batts are stuffed tightly into the attic cavity, they will not perform as well. To boost the R-value, you can add another layer of fiberglass batts. However, be sure to use a protective kraft-paper backing on the batts, as it may trap moisture.

Extruded polystyrene is cheaper than mineral wool and urethane, but it also has a lower R-value. It is also much more rigid and durable, making it popular for structural panels. EPS is inexpensive and comes in two forms. The former is a rigid foam board that can be cut to shape and glued into place, while the latter is a plastic resin that expands and contracts.

Foam board is another DIY option for insulating the roof. It’s easy to install and doesn’t require an attic. It is also light and easy to work with. The R-values of foam board are higher than that of fiberglass. However, fiberglass insulation is often not that effective. Therefore, foam board may be the better option. The insulation it provides will increase the value of the property.

Spray foam

A house that lacks an attic may not have an adequate amount of attic space for installing spray foam insulation. The easiest approach is to install one layer of polyethylene air and vapour barrier on the underside of the ceiling joists. This method can be completed in conjunction with interior renovations. The best way to make the process as easy as possible is by using a spray foam installer who is certified to install closed-cell spray insulation.

You can also use rigid foam panels for the floor of your home instead of attic space. This will reduce the need for a vapor barrier and will block air flow from the attic. In addition, spray foam insulation requires no vapor barrier, and will provide a higher R-value per inch than traditional insulation. However, it will require the installation of drywall on the walls and ceiling to ensure safety. However, if you cannot do it yourself, you can hire a professional.

A spray foam insulation for roof without attic can help lower energy costs by preventing energy loss through ducts in the attic. In fact, spray foam can pay for itself in three to five years. Another benefit is the reduction of allergens and airborne pollutants. These two factors make spray foam an excellent choice for homes with a hotter climate. If you don’t want to spend the money to install a new attic, you can install this insulation to keep your attic at a comfortable 80 degrees year-round.

If you’re concerned about the safety of the spray foam insulation for roof without attic, choose a professional with extensive experience in building science. He is BPI certified, Dale Carnegie certified, and has completed several building science courses. He oversees the Michigan office and company and serves as professor of foam at the Foam University. In his spare time, Eric enjoys woodworking, hunting, and camping. While you’re working on the insulation for your roof, make sure you’re disposing of the old and damaged insulation.

While working on your attic, be careful not to stand on the joists. If you have to, lay down plywood or other sturdy wide boards to prevent injury. Make sure to use a standing surface that spans three or more joists. Be sure to shower afterwards and make sure you have clean, dry clothes. If the attic has a hatch, you should install a hatch or attic door to seal it.


Many homes have inadequate or no attic insulation, and fiberglass may be doing a poor job. If your attic insulation has lost some of its R-value over time, you should consider cellulose insulation. It adds R-value, and unlike fiberglass, it won’t lose it when cold weather sets in. It forms a seamless blanket of natural fibers, and it won’t lose its R-value like fiberglass does. Its R-value is 3.8 per inch – twice as much as typical blown fiberglass.

Although fiberglass batts are a cheap, easy way to add insulation to your home, they provide mediocre insulation. Even if you live in an upscale neighborhood, fiberglass batts won’t provide enough R-value to help you reduce energy bills. Luckily, there are other ways to insulate a roof without an attic. Here are a few suggestions. You can purchase fiberglass batts at a home improvement store and roll them out yourself.

When installing fiberglass batts, make sure to install them at the correct angle. The top of your existing batts should be flush with the ceiling joist, and the bottom chord of the truss should be level. When installing fiberglass batts, choose un-faced insulation when possible. Faced fiberglass batts should be installed facing the heated space. Using a depth guide will help you determine how many batts you need.

Another method to insulate a roof without an attic is by using thick fiberglass batt. But it’s important to remember that thicker fiberglass batts have a higher R-value, so you’ll need wider rafters. Remember to use protective gear if you choose this method. Also, keep in mind that fiberglass and wool may cause health problems. When choosing the best option for your home, make sure to follow all the manufacturer’s directions and safety guidelines.

Another option is to use batt blanket insulation. These insulation panels are easy to install, come in different sizes, and are relatively DIY-friendly. While they’re the least expensive type of insulation, they don’t provide the same seal as spray foam insulation does. It’s also easier to work with, and they’re often less expensive than fiberglass. Despite their low cost, batt blanket insulation is also easy to install, making them a popular option for homeowners who don’t want to spend a lot of money.

Foil-faced batts

The insulation is manufactured to fit the size of typical stud framing, which is 16 or 24 inches on center and 92 inches high. The batts fit into these studs without the need for attic space, and make the installation process much quicker. It also provides a higher R-value than standard fiberglass batts. Depending on your home’s insulation needs, you may be able to find R-values as high as 4.3.

After cutting the foil-faced batts, install them between the framing members. They should fit snugly against the top and bottom wall plates. If you use staple-free batts, cut them about 3/4″ wider than the wall cavity. You can find these batts in most home improvement stores and lumberyards. You should also consider adding a vapor retarder.

The US Department of Energy recommends using foil-faced insulation as it is a great way to stop the transfer of conductive, convective, and radiant heat. This insulation is very effective at blocking the heat transfer between your home’s interior and exterior, so you should choose it carefully. Insulate walls and ceilings, not the attic. If you want to install roof insulation without attic space, you should follow all of these steps.

Once you have installed the insulation, the next step is to staple it to the roof deck. Once the insulation is firmly adhered, you will have a better understanding of how to use it properly. Remember to follow the manufacturer’s instructions when installing insulation on your roof. If you aren’t comfortable with using the ladder, you can always hire a professional to apply it for you.

When using foil-faced insulation, make sure to install the insulation first. Once you have installed the insulation, staple the foil-faced batts to the underside of the roof rafters. The shiny side of the foil must be facing upward. Remember that the foil-faced insulation is conducting heat just like any other material. This insulation is not effective for homes without attics.