New Jersey Required Roof R Value

R value of various materials.

New jersey required roof r value.

The r value of thermal insulation depends on the type of material its thickness and its density. Walls should be between r 19 to r 21 basement walls r 13 to r 19. Floors r 25 to r 30. What r value do i need.

Existing attic 3 4 inches of insulation r 38. All construction codes and their enforcement were controlled by the provisions stated in the act. The act became effective on february 3 1976. The state of new jersey passed the new jersey uniform construction code act on october 7 1975.

R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. Insulation r value requirements for new jersey what is r value. Or insulation sufficient to fill the framing cavity r 19 minimum. Attic insulation run between r 49 to r 60.

The higher the r value the better the thermal performance of the insulation. For a very good introductory overview article on r value see r values over at the website of. R 5 shall be added to the required slab edge r values for heated slabs. State only nj new jersey ashrae 90 1 2013 4 r 30 5 r 30 state only nm new mexico 2009 new mexico energy conservation.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Resistance to the movement in temperature through walls ceilings and floors in your home or commercial building. A common differentiating criteria between different types of insulation is the amount of r value they provide when.

R value is a measure of insulation s ability to resist heat traveling through it. Uniform construction code regulations njac 5 23 1 et seq went into effect on january 1 1977. State applicable energy ashrae zone minimum r value state. State of new jersey department of community affairs division of codes and standards po box 802 chris christie trenton new jersey 08625 0802 governor kim guadagno.

B u l l e t i n. Recommended home insulation r values. Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

The higher the r value the greater the insulating effectiveness. Minimum insulation r value requirements non residential above roof deck. Specific insulation requirements of section c402 2 thermal requirements of either. Insulation is rated in terms of thermal resistance called r value which indicates the resistance to heat flow.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Insulation r value requirements for usa. New york recommended insulation r values zone 4.