How do you insulate an existing roof?

Quote from the video:
Quote from Youtube video: New roof sheeting goes on top screwed into the framing. And inch-and-a-half. Cover the roof deck with roofing underlayment that will protect against liquid water but also allow vapor to escape.

How do you insulate a hot roof?

Quote from the video:
Quote from Youtube video: We have spray foam the whole entire attic deck dividing the house from the attic portion. And this will be a non conditioned. Space. So we've our insulation down on the deck.

Can you insulate on top of a roof?

A roof over a vented, unconditioned attic does not need to include any insulation. However, most cathedral ceilings and low-slope (flat) roofs are insulated roof assemblies: with this kind of roof, the insulation follows the slope of the roof. Insulated roof assemblies can be vented or unvented.

How do I insulate my attic in Southern California?

Here in Southern California—and any other hot climate—it’s usually recommended to install both a radiant barrier and blown-in fiberglass or cellulose in the attic (in cooler climates, it can be more cost-effective to install more thermal insulation).

What is the cheapest way to insulate an old house?

You can simply use a foil for insulation as a cost-effective alternative. By stapling the foil sheets to your attic, the heat reflects down into your living space. Hence, it lowers your heating costs. Attic Insulation Installation Services in Lincolnwood provide satisfactory assistance and properly insulates your home.

Is spray foam insulation worth it?

Spray foam insulation is a great product. Homes insulated with it can be some of the most efficient and comfortable homes built. I’ve been in plenty of these homes and can tell you that a typical spray foam insulated house outperforms a typical fiberglass batt insulated house.

Does a hot roof need to be vented?

A “hot roof” means that insulation is installed closely beneath the roof decking, without space for ventilation.

How do you insulate a roof without ventilation?

Unvented roof assemblies should be insulated either with air-impermeable insulation (rigid foam or spray polyurethane foam) or with a combination of foam and air-permeable insulation.

How do you insulate a roof without venting?

Two acceptable methods for insulating an unvented attic assembly in all climates are as follows:

  1. Air-impermeable insulation (typically spray foam) installed to the underside of the roof sheathing. …
  2. Air-impermeable insulation (typically rigid foam insulating sheathing) installed over the roof sheathing.

What is the best attic insulation for Southern California?

In the Southern California climate, the recommended total attic insulation is a rating of up to R60. For homes with an existing 3-4 inches of insulation, that means adding about 12-15 inches of insulation (R30-R38). Selecting the right R-value will reduce your energy costs the most.

What is the California code for attic insulation?

That’s where this nifty EnergyStar chart comes in handy. Sacramento and most of California are in Zone 3, which requires attic insulation with an R-value between 30 and 60. On this chart, each part of the country is divided into different zones and each zone has a recommended R-value.

Is insulation required by code in California?

Supply ducts in attics shall be sealed and insulated to a minimum of R-8. All other ducts shall be sealed and insulated to a minimum of R-6. Ducts or portions thereof located completely inside the building thermal envelope are exempted from the insulation requirement.

How do you insulate a 2×6 roof?

Quote from the video:
Quote from Youtube video: 2 inches thick is roughly our 11.4 I think yes 1 inch is 5.7. So 2 inches is 11.4. So to get our. 30 you have to have at least three layers of this stuff. So three layers will be six inches deep.

Do you need a vapor barrier in California?

We need vapor barriers in California Climate Zones 14-16. In some climate zones, an air barrier allows currents of air to help prevent water vapor from forming. A vapor barrier is likely required if the building is cladded with absorptive material and if the structure is in United States climate zones 4C, 5 through 8.

Is radiant barrier required in California?

Can you explain the following statement in California’s Title 24? “The Title 24 prescriptive compliance approach requires a radiant barrier in climate zones with significant cooling loads (zones 2-15). The performance approach does not require a radiant barrier in any climate zone.”

How is radiant barrier installed?

For the majority of installations, there are basically two different methods used to install radiant barrier foil in an attic. The first is stapling foil to the bottom of the roof rafters, the second is laying it out over the existing attic ceiling insulation.

What is radiant barrier plywood?

Radiant barrier sheathing panels are engineered wood panels with a thin layer of highly-reflective aluminum facing that reduces radiant heat gain into the attic. The result is a cooler attic, which can equate to lower utility bills, improved energy efficiency and a more comfortable indoor environment.

How do you install plywood radiant barrier?

Quote from the video:
Quote from Youtube video: Place a skid resistant side up with the APA trademark stamp side the foil side facing down against the structural supports install with the long strength access dimension of the panel across supports.

Which is better insulation or radiant barrier?

All in all, installing both insulation and a radiant barrier will have the strongest and most effective result for your house. But if you must decide between the two, there is likely a clear winner: the radiant barrier.

What is OSB radiant barrier?

Oriented strand board (OSB), with a thin layer of low emitting aluminum foil attached to one side, is a common type of thermal-radiant-barrier sheathing. Foil-backed OSB is applied mostly in attics; however, it is also used in wall systems.