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What is the Proper Insulation For Vaulted Ceilings?

St Louis - St Charles Insulation Company.


Insulating Your Vaulted Ceilings

If you are putting an addition on that involves a vaulted or cathedral ceiling, you may wonder what type of insulation is best for it. After all, rooms with high ceilings need a bit more help warming up in the winter than other standard ceilings. The insulation you add will have to be appropriate to this application as well as the highest quality.

The top three insulation options include cellulose, fiberglass, and open cell spray foam.

1. Cellulose Insulation For Vaulted Ceilings

This type can involve a tricky installation. If your insulation contractor in St. Louis MO doesn’t use wet applied cellulose, they will have to staple a fine mesh screen underneath the roof trusses, placing the hose towards the top and filling in the cellulose behind the mesh.

Pros of using this type:

  • Cellulose can adhere to most nooks and crannies.
  • It’s inexpensive.
  • It is resistant to pests, mold, and fire.
  • Cellulose contains more recycled materials than other insulation types.

Cons of using this type:

  • It can settle up to 20 percent. This is a problem with cathedral ceilings, as it can result in air leaks and high energy bills.
  • It must be kept dry, as it can absorb up to 130 percent water by weight.
  • Cellulose dries slowly after water damage, resulting in deterioration and settling.
  • It weighs a lot more than fiberglass, and can settle more easily due to the slanted space.
  • Allows movement throughout the material, resulting in an uncomfortable home and higher energy bills.

2. Fiberglass Insulation For Vaulted Ceilings

Contractors install this by stapling batts to the underside of the roof before hanging the drywall.

Pros of using this type:

  • Can be an inexpensive option
  • Can be placed in stud cavities in the ceiling.

Cons of using this type:

  • Allows for air movement
  • Fiberglass tends to trap allergens, moisture and dust, which can encourage mold growth.
  • It can sag over time, especially when wet.
  • Voids may be left with no coverage if the fiberglass hasn’t been cut to fit properly.

3. Open Cell Spray Foam Insulation For Vaulted Ceilings

Open cell is a better choice for cathedral ceilings over closed cell due to its capacity to expand. When installed, the foam is sprayed on the roof’s underside, expanding to fill all the nooks and crannies. Both open and closed cell will create an air seal.

Pros of using this type:

  • An air seal is created that prevents air leakage.
  • Fills all the nooks and crannies.
  • Safe for your home and environment.
  • Most spray foams have no odor.
  • Results in a comfortable and energy-efficient home.

Cons of using this type:

  • It’s more expensive than traditional insulation materials.
  • Some spray foams have an odor.
  • All cavities may not be filled if the spray foam isn’t installed properly by a professional.

In the end, your decision will depend on which type your insulation contractor in O’Fallon recommends and is comfortable using. It will also depend on your budget. But keep in mind, if you go with the cheapest option now, you could be facing an insulation replacement project sooner rather than later.

Call Addict Insulation in St. Charles MO

If you require insulation for your vaulted or cathedral ceilings, our insulation contractors in St. Charles MO can visit your home and perform an inspection. Make an appointment when you contact us at 636-233-7314.

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