Aluminum Foil On Head

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FAQ

... building code max. (R-50)???

you need ventilation. the insulation is to keep heat i the living area of your home, your attic should be as cold as outside. make sure you have good soffit vents(intake) and good ridge or roof vents(exhaust). if you already have proper ventilation holes then make sure nothing is blocking them. many times folks push the insulation too far to the ends, blocking the soffit vents. you're loosing heat from your home into the attic which melts the roof snow and the outside temp then quickly turns this into ice. proper insulation as well as ventilation work hand in hand to combat this.

Live in Houston, very hot and humid. Looking at adding radiant and additional insulation to roof in house. We have a lot of sun, and AC bills.

we live in the desert, and got our roof coated, and instantly noticed the difference, it is much more insulated, and provides protection against leak (which was the main reason we had it done)

Foam and the new building technolodgy's are coming to New Orleans. The rebuilding is causing New Orleans to be the "Greenest City in America". Energy Efficiency and the proper buiilding techniques tak hold.

it is one of the strongest roof sealers and the best insulator available

The distance between knee wall and attic ceiling is about 6 foot. Could I push a perforated pipe between the rafters?

That is an option. And there aren't many options.Not much is going to slide easily behind the insulation. I'm thinking --------------------. You are undoubtedly going to snag on roof nails coming through the decking. I don't know if they would hold up but the cardboard tubes wrapping paper comes on might work if you tape 2 together. and flatten and tape the end you will be pushing in first. cut slots with utility knife. I think your idea would work if you can afford the pipe. That's a tough one. When we convert attics we line those cavities with a styrofoam insulation chute end to end until we reach open ventilation-you probably know that by now. Give it a try.

Hi, I have got a physics question and was just wondering about it.. Can someone pls tell me how does roof insulation work? how is it effective? How does the insulation changes the heat circulation and transfer inside a house?I know that the insulation prevents radiation from the sun and overheating.. but any more details about radiation, convection and conduction of heat pls?

Well insulation makes a dead air space (air is stagnant). Since the air is not moving the transfer of hot and cold is slowed down considerably. But since you have to create cross ventilation to reduce rotting in wood and the build up of explosive gasses. Its a crap shoot that it even does any good. Radiation is heat so that's covered by the dead air space. Convection is usually not an issue with the cross venting. Also for conduction the insulation should slow it down considerably.

I do not have extra space on the roof. Roof also tapers to drains at one end of building.

the R values, i am not sure. that white stuff is NOT Styrofoam. it is a cheap imitation. Real Styrofoam is made by DuPont, is usually a light blue, with a plastic seal coat on both sides. that thin plastic seal coat doubles the R value. what really does the insulation, is trapped air. air is actually a poor conductor of heat. the foam is actually little bubbles of air. dead air that is, air that cannot circulate and move. it works similarly to the way a down vest or coat works, it fluffs up and holds the air pockets out within a confining structure, thus retaining heat. the rigid stuff will last much longer, i can tell you that much. the white foam stuff deteriorates quickly. buy cheap, get cheap, is the general rule. you may wind up only having to do it again in a few years.

Above the trailer roof is a metal pitched roof with no soffit and lots of air-flow. I plan to recess the insulation 6" to allow airflow. There is a suggestion that I need a vapor barrier. If I use a vapor barrier, won’t water collect between the roof and the barrier. I was thinking if using strapping crosswise every 4” to act as a channel for water runoff. Any ideas?

your plan is good ...

Best roofing insulation to keep warm in the winter?

The best insulation that you will find is R15 fiberglass that is installed inside the attic between the roofing rafters. It's twice as thick as R12 which goes behind wall paneling. If you're talking about roofing shingles, they don't really act as insulation but architect shingles last the longest.