Depending on where you live and the part of your home you're insulating (walls, crawlspace, attic, etc.), you'll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.
If you decide to insulate the ceilings, they should have a minimum ceiling insulation R-value of 30.
I would not put anything less than R5. Even R6 if you can get it. Good insulation is one of the best bang for your buck improvements you can make. It really isn't worth saving a little on lower R values, for something you will have in there for 20+ years.
Foam Board or Rigid Foam
For ceiling applications, rigid board roof insulation types are ideal. The foam is easy to install and performs efficiently. It is possible to achieve spray foam levels of sufficient R-value density. Rigid foam is waterproof.
The optimal R-value for most homes is 30, but you can go as high as 38 if you live in a tropical climate. Anything higher than 38 indicates an over-insulated space.
The answer is yes! Past a certain point, insulation in a vented attic will do more harm than good.
Thermablok® Aerogel is a revolutionary advancement in thermal technology offering the thinnest insulation available to prevent thermal and cold bridging. Classed as a Super Insulation, Aerogel has the highest insulation value of any known material with the lowest thermal conductivity value of any solid (0.015W/mK).
Most climates require a vapor barrier to cover ceiling insulation, but not all insulation requires a vapor barrier. It's always important to refer to your state's building codes.
R-Value is a measure of insulation's ability to resist heat flow. The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.
Effective ceiling insulation is the best barrier against the summer heat and the winter cold, saving you up to 20% on your heating and cooling energy costs.
Determine what R-Value you need. Generally speaking, the higher the R-value, the better the insulation. Insulation won't turn your home into a hotbox – in summer and winter, it'll stop temperature from transferring into your comfortable living areas.
Kraft-faced insulation includes a paper vapor retarder, which helps prevent mold and mildew. Kraft-faced insulation should be installed in exterior walls, exterior basement walls, and attic ceilings by pressing the product into the wall cavity with the paper side facing outward, towards the installer.
Homes in coastal areas may find R4 and R5 insulation adequate, while those in more extreme inland climates might benefit from the superior thermal resistance of R6 and R7 batts.
While both types provide insulation, R30 is the better option for maximizing energy savings in areas where heat loss or gain is a major concern. For example, R19 may suffice for interior walls, but R30 is more appropriate for exterior-facing attics or floors.
The best way to insulate vaulted ceilings
If your loft has plenty of space, the most straightforward way to insulate vaulted ceilings is using batts over the rafters. Typically, your local loft insulation expert will leave a two-inch gap between the roof sheathing and insulation allowing for efficient ventilation.
What R-value insulation should I use in my garage? Generally, insulation with an R-value between R-13 and R-21 is recommended.
It is possible to over-insulate your house so much that it can't breathe. The whole point of home insulation is to tightly seal your home's interior. But if it becomes too tightly sealed with too many layers of insulation, moisture can get trapped inside those layers.
Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.
Batt insulation is a type of insulation blanket. These are pre-cut sections of insulation that are usually fiberglass, although cellulose, mineral wool, natural fibers and plastic versions are also available. This type of insulation is the best insulation for unfinished walls, floors and ceilings.
When it comes to insulation, it's generally recommended to leave a gap between the insulation material and any other surfaces, such as walls, ceilings, or roofs. This gap provides ventilation and prevents moisture buildup, which can lead to mould and other problems.
Should I Put Vapor Barrier Plastic Over Insulation Before Drywall? Yes, covering your insulation with a vapor barrier plastic before installing drywall is crucial. It prevents moisture buildup that can lead to mold, rot, and even structural damage.
Install the vapor barrier on the warm side of the insulation.
The best kind of rigid foam insulation is polyisocyanurate, also known as polyiso. It has the highest R-rating of any rigid foam insulation and comes with a reflective foil on both sides, allowing it to act as a radiant barrier as well.
Vacuum insulation panels (VIPs) are among the most advanced insulation materials on the market. They use a vacuum-sealed core to achieve exceptional thermal resistance, often far superior to traditional options like fiberglass or foam. Pros: Ultra-thin panels conserve space while providing top-tier insulation.