Which materal is best to use for insulating the roof?

Walls and roof
The most practical and effective means of preventing the passage of heat through the walls and roof of a house is by insulation. The value of insulation as a means of keeping the house warmer in winter and cooler in summer has been so well established that today insulation is built into the house along with the heating and plumbing systems. A well insulated house will be considerably cheaper to maintain than one in which insulation was omitted because of the additional cost.

The best time to add insulation is during the construction of the house. A large part of the cost of insulation is the labor involved, and this can be reduced by having the walls and roof insulated before the inside
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Walls and roof
The most practical and effective means of preventing the passage of heat through the walls and roof of a house is by insulation. The value of insulation as a means of keeping the house warmer in winter and cooler in summer has been