How Much Do Baffles Add To R Value Of Roof

For a very good introductory overview article on r value see r values over at the website of.

How much do baffles add to r value of roof. As with attic floor insulation moisture and heat removal are the reasons for creating proper air. Pull any existing insulation away from the edges of the attic where you will be putting up the baffles. Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

A new roof can increase home value but you might not see a 100 return on investment very few improvements if any offer a full recoup of money spent. If your roof rafters have been covered over with drywall or plywood you will have to remove it in order to install the baffles. R value of various materials. Baffles establish a channel for air to circulate between the insulation and the roof sheathing.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Even with a 3 12 2 4 truss you are looking at a minimum r15 at the farthest edge. Roughly 12 to 20 inches depending on the material used will provide an r 50 rating. As listed in the definition above the baffle is meant to regulate the flow of air.

R value is a measure of insulation s ability to resist heat traveling through it. Things to look for if you do it yourself. Step 2 in the bay. Recommended home insulation r values.

By installing the baffles properly you can increase the r value all the way out to the exterior sheathing. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. You should of course see the manufacturer provided technical data sheet for the r value of specific products. You will need a baffle for each space between the rafters.

Insulation level are specified by r value. Recycled glass or sand that s melted and spun into fibers.