Roof Insulation U Values

Notes to the table above.

Roof insulation u values.

The table below shows what levels of insulation are cost effective for different climates and. These can be supported with a detailed report. We provide u value calculations to show compliance with current building regulations standards and best practice. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

Therefore the less heatloss. Building regulations standards and u values. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Adversely u value measures the rate of heat transfer.

For a very good introductory overview article on r value see r values over at the website of. R value is a measure of insulation s ability to resist heat traveling through it. The lower the u value the more insulation there is in a building element e g a floor ceiling or wall. U values are the direct opposite representing the amount of heat that escapes through a material.

Rosato asbestos insulation is the most authoritative source on asbestos properties and gives data for the thermal conductivity of asbestos in different forms and with varying temperatures for magnesia asbestos insulation at mean temperatures ranging from 100 f to 400 f the k value thermal. For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09. Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell. The easiest way of getting a u value calculation is by using our free online u value calculator.

Consequently the higher the u value the more heatloss you have in the home. A standardized insulation rating system ensures consistency with insulating materials rated in r and u values. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. The higher the r value the greater the resistance and the insulating value.

Notes on the r value k values of different forms of asbestos. U value has an inverse relationship to r value. Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Column a is for extensions where the existing dwelling s walls and roof u values are worse than 0 70 w m k in the walls and worse than 0 25 w m k in the ceiling.

The higher the r value the better the thermal performance of the insulation. R value is essentially a product s resistance to heat flow which means that the higher the product s r value the better it is at insulating the home and improving energy efficiency. Knowing what r value and u values mean is key to following energy codes and to selecting products that best suit the climate zone you are building in. R values represent resistance to the flow of heat.

For more information see our articles and how to videos below. R value of various materials. Recommended home insulation r values.