Our roof calculator uses base length and base width to find the estimated area.
Roof surface temperature calculation.
Your job is to calculate and illustrate the temperature gradient through a roof assembly composed of a gravel surfaced built up roof 3 4 inch thick perlite insulation 2 inch thick polyisocyanurate insulation two ply felt and asphalt membrane vapor retarder 1 2 inch thick gypsum board and metal deck.
You want a roof area calculator that provides accurate estimates to help you order materials such as shingles membrane roofing or ceramic tile.
7 5 cm of cellular concrete representing the top slab and the topping 2.
Click on the red button to compute sri and roof surface temperature.
For the calculation of surface temperature and heat flux the roof figure 1 was approximated by three homogeneous layers figure 2.
20 cm of cellular concrete.
Ts to a id is hso a absorption coefficient of outside surface id direct solar radiation on surface.
Start the project with a roof area calculator.
Input r and e in blue and green cells.
To compute solar reflectance index sri and roof surface temperature based on solar reflectance r and thermal emittance e using astm standard e 1980.
7 cm dead air space ventilation and spacer blocks ignored 3.
1 roof square 100 square feet.
Area is defined as the expanse or measurement of a given surface and there are a few methods for measuring your roof s area.
The length l times the height h of a triangle is twice its area a2.
This calculator produced by lawrence berkeley national labs lbnl allows you to compute solar reflectance index sri and roof surface temperature based on solar reflectance and thermal emittance based on astm standard e 1980.
Calculating the surface area of a sloped roof can be time consuming without the right tools.
The rooftop temperature results from two different properties.
An approximate equation for the sol air temperature ts of the outside surface of a given wall or roof is.
The base width is the distance from one corner of your roof to the other at its base on the short side of your house.
Ambient conditions and reference surface properties specified in next worksheet.
The house base area is the area of land that the house covers and for more complex shapes can be estimated using the area calculator.
