To calculate a rough estimate follow these steps.
Measuring a roof for shingles.
You will then have to get the measurement of the rake of the roof.
Measure both the width gable side and the length eave gutter side.
Measure your roof accurately use a measuring tape preferably 50 or 100 feet long and get exact ground dimensions of your house.
If the existing shingles are standard 3 tab shingles you can get this measurement by taking note of the number of tabs along the eaves and ridges then determine the length in feet.
Don t worry too much if you don t know how to measure a roof for shingles.
The length l times the height h of a triangle is twice its area a2.
But if you re curious how the measuring process works think back to your geometry classes in school.
For each individual section of roof that you measured you will need to multiply the length by the width which will give you the square footage of that section.
How to measure a roof for shingles draw a rough layout of your roof.
1 length of all slopes measure from ridge to eave length 2 measurement of all hip rafters length from ridge to eaves 3 measurement of all roof eaves areas bottom roof perimeter areas 4 measurement of all valley areas where two opposing.
Place the end hook of the tape on the corner and run it all the way to the opposite corner of the house.
Required measurements include the following.
This doesn t have to be an exact sketch but.
L 30 feet h 12 feet 30 12 2 180 square feet.
So if you divide your answer of a product of length times height by two you will get the area of a triangle.
Measure and record your findings.
Calculate the square.
Divide the roof into manageable sections.
1 roof square 100 square feet.
To figure out the area of a square or rectangular room measure length and width and multiply them together to get the.
Your roofer will measure the surface of your roof to determine the total square footage which will dictate how many shingles must be purchased to fully cover the roof s planes.
Keep in mind that this estimation won t include any areas like garages or enclosed patios that the roof covers.