When designing and building an unvented attic using spray foam insulation you need to take into account code related to.
Attic insulation florida code.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.
Insulation requirements in florida.
Here s what you need to know about insulation requirements in florida.
Let s say you measured your attic and you realize your attic has about 9 inches r 30 of insulation and your attic is about 40 sq feet you d need at least 3 inches of extra insulation that covers 40 sq ft to get an r value of r 38.
For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6.
Most insulation you buy will have a sq ft number for easy reference.
What r value is best for my home.
All florida insulation proper insulation levels for attic insulation in orlando maitland lake mary longwood gotha call 407 410 3626 for a free quote.
Section r316 building thermal envelope code local codes.
Framed wall insulation must meet or exceed r 13.
The florida building code identifies two distinct climate zones.
Section r806 4 local codes based on irc 2012.
Unvented attic code local codes based on irc 2009.
Broward collier hendry lee miami dade monroe and palm beach and require a minimum r 30 attic insulation.
Climate zone 1 consists of the following south florida counties.
Blown fiberglass installed in the attic has an r value of 2 2 per inch so 12 inches of it would give you an r value of 26 4 in your attic installation project.
Section r806 5 spray foam code local codes based on irc 2009.
Typically current best home building practices indicate an r 30 to r 38 for attic insulation.
Section r316 local codes based on irc 2012.
Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.