How Much Do Baffels Add To R Value Of Roof

R value of various materials.

How much do baffels add to r value of roof.

Baffles establish a channel for air to circulate between the insulation and the roof 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. Recycled glass or sand that s melted and spun into fibers. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.

Raft r mate attic rafter vents create a space between each rafter for air to flow freely up the rafters and into the attic. 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. Let s hope the xps holds it r value for a few decades. Recommended home insulation r values.

R value is a measure of insulation s ability to resist heat traveling through it. Step 2 in the bay. The higher the r value the better the thermal performance of the insulation. I think if i count the r value of the eps baffle i m at 18 value on outside edge and 28 to maybe 30 just inward of the wall.

I know this work is less than ideal and doesn t meet new codes. For a very good introductory overview article on r value see r values over at the website of. 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.

If your roof rafters have been covered over with drywall or plywood you will have to remove it in order to install 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. 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. You will need a baffle for each space between the rafters.

As listed in the definition above the baffle is meant to regulate the flow of air. As with attic floor insulation moisture and heat removal are the reasons for creating proper air. By installing the baffles properly you can increase the r value all the way out to the exterior sheathing. Insulation level are specified by r value.

Owens corning raft r mate attic rafter vents. Do most of these kits use open cell or closed cell foam.