How are blueprints measured? Unroll the blueprint onto a flat surface. ... Find the scale of the drawing. ... Choose a scaled ruler that accurately matches the scale of the drawing. ... Lay the proper scale next to the item on the drawing and take the measurement.

Measure My Roof Online

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The good news is there is a way to measure your roof in a safe and accurate way, all from the comfort of your home: use Google Earth. With just a few clicks, you can search for any address, get a bird’s eye view of your roof, and get the roofing measurements that you need.
Are property lines on Google Maps accurate? No. Google Maps are not that accurate, and you shouldn’t rely on them as a source for factual information regarding property lines. Much like a plat map, they only provide a general idea of where property lines exist.

Measuring the Roof’s Pitch

The incline or pitch of a roof can be easily measured with a level, tape measure, and a pencil. The roof’s pitch is the number of inches the roof rises in 12 inches. Therefore, mark off 12 inches on the level and place it down horizontally against the roof rafter.

Next, measure vertically from the 12-inch mark on the level straight up to the underside of the rafter, as illustrated below. That measurement is the number of inches the roof rises in 12 inches.

Some homes will have roofs with multiple pitches. Porches and dormer windows, for example, can have a different pitch from that of the rest of the house. For an accurate surface area measurement you should make note of these additional structures.
In most cases, satellite and aerial roof measurement technology is 99% accurate, if you follow a few simple rules. Achieving accurate roof measurements manually isn’t any different. A manual roof takeoff by one roofer can easily vary from that of another.
 
How Many Roofing Shingles Do I Need?
  1. Measure the length and width of each plane on the roof (including dormers) then multiply length times width.
  2. Add the square footage of each of the planes together.
    How Many Roofing Shingles Do I Need?
    1. Measure the length and width of each plane on the roof (including dormers) then multiply length times width.
    2. Add the square footage of each of the planes together.