How Much Do Baffles Add To R Value Of Roof

Roughly 12 to 20 inches depending on the material used will provide an r 50 rating.

How much do baffles add to r value of roof.

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. For a very good introductory overview article on r value see r values over at the website of. 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. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

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. You will need a baffle for each space between the rafters. Things to look for if you do it yourself.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Pull any existing insulation away from the edges of the attic where you will be putting up the baffles. Step 2 in the bay.

Even with a 3 12 2 4 truss you are looking at a minimum r15 at the farthest edge. By installing the baffles properly you can increase the r value all the way out to the exterior sheathing. The higher the r value the better the thermal performance of the insulation. Recommended home insulation r values.

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. Although it generally won t hurt to add more the return on the investment decreases as the r value increases above r 50. R value is a measure of insulation s ability to resist heat traveling through it. Insulation level are specified by r value.

As listed in the definition above the baffle is meant to regulate the flow of air. But even if you don t see a huge financial return a new roof can make you more likely to get full asking price lower time on market and smoother negotiations.