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That means 1/4 of an inch . The quarter value of a whole inch. Example: Suppose this is an Inch in length < _ _ _ _ > A fourth of an inch is this <_>
Inch value (X) = Centimeter value (Y) / 2.54
1.4 inch is the decimal equivalent. Decimal is a way of representing numbers so that the place value of each digit is ten times that of the place value of the digit to its right. That applies whatever the system of measurement.
it is a good thing i think R Value is the thermal resistance of a given material. The higher the R Value the more thermal resistance and the better the insulation. So, an R48 roof system is warmer than an R32 roof system. All insulation materials are rated by their R Value. An inch of rigid insulation has a higher R Value than an inch of fiberglass insulation. Check with the insulation manufacturer for the R Value.
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