Recommended R Value For Attic In Florida

Typically current best home building practices indicate an r 30 to r 38 for attic insulation.

Recommended r value for attic in florida.

Existing 3 4 inches of insulation. Walls are entered by the type of assembly and the r value of insulation. An r value is also calculated per inch of width. Let s start at a base point.

Energystar recommends an r value of r 38 for most homes. Most computer programs allow the user to calculate gross wall areas and subtract window and door areas. Solid wood has an r value of 1. The higher the r value the greater the insulation performance.

This zone has a recommended r value of 30 to 60 for an uninsulated attic r25 to r38 for an attic with existing insulation and r13 to r19 for the floor. The r value your home s attic needs depends on where you live. Know exactly how much you need with our project calculators. R values of framing members concrete blocks gypsum board etc.

R value measures how well certain building insulation materials can resist heat. Recommended insulation levels for retrofitting existing wood framed buildings. All r values are insulation only tested labeled per ftc rule16 cfr 460. Framed wall insulation must meet or exceed r 13.

Now that you have an idea of the depth you need you need to measure the width and length of your attic. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. See the department of energy s doe ranges for recommended levels of insulation below. Insulation requirements in florida residential requirements for insulation are divided by the location in the home.

For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6. When determining how much insulation you need don t guesstimate calculate. Homes should have between r 22 and r 49 insulation in the attic. Therefore a three inch thick board has an r value of 3.

Energy star s map of recommended home insulation shows that the majority of florida is within zone 2. If your attic has enough insulation and your home still feels drafty and cold in the winter or too warm in the summer chances are you need to add insulation to the exterior walls as well. 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. The florida building code identifies two distinct climate zones.

Climate zone 1 consists of the following south florida counties. Broward collier hendry lee miami dade monroe and palm beach and require a minimum r 30 attic insulation.