Roof Insulation Number Table

In most cases the attic is ventilated and the infiltration barrier is the drywall ceiling.

Roof insulation number table.

Notes on the r value k values of different forms of asbestos. Rosato asbestos insulation is the most authoritative source on asbestos properties and gives data for the thermal conductivity of asbestos in different forms and with varying temperatures for magnesia asbestos insulation at mean temperatures ranging from 100 f to 400 f the k value thermal. The cool roof requirements for re roofs are the same as for new construction and use the same values from table 151 d noted above. In this case the insulation must lie directly on top of the ceiling.

At firestone building products we offer more than just roofing and building solutions. We offer a partnership and complete solution that lasts long after your project is finished. Input length and width of area to be insulated. View and learn more about commercial roofing insulation.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. Ft whichever is less is replaced. The higher the r value the better the thermal performance of the insulation. Exceptional dimensional stability and rated for extreme hail rockwool stone wool insulation roof boards have meet both the fm severe hail and the ul 2218a standard for impact resistance.

Cool roof requirements are triggered when either 50 percent of the roof area or more than 1 000 sq. Not only do we withstand hail damage but our roof boards maintain their bond to the roof membrane lowering the likelihood of a catastrophic roof failure. This calculator should be used as an estimating tool only. Where both air impermeable and air permeable insulation are provided the air impermeable insulation shall be applied in direct contact with the under side of the structural roof sheathing and shall be in accordance with the r values in table r806 5 for condensation control.

Notes to the table above. R value is a measure of insulation s ability to resist heat traveling through it. 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. Insulation level are specified by r value.

A blower door test is required n1102 4 1 2. Per pa ucc the air exchange is required to be 5 ach or less 0 2 water gauge 50 pascals whole house mechanical ventilation is required r303 4 per table m1507 3 the ventilation rate is based upon the square footage of the dwelling and number of bedrooms within the dwelling.