How to measure a roof for tiles

How to measure a roof for tiles

Final roofing question is how to measure a roof for shingles, I get it. Now My thoughts are who is trying to measure the ceiling. Are you a homeowner or new to the roofing business? In any case, the first suggestion is that the person who measures should climb on the roof, as long as it is a passable plot. What is meant by passable is a roof slope of 3:12 to 6:12.

If the roof is walkable, you can simply measure each plane, both the width and the height. In this way you will get a base of square meters of the roof. Also, if you have a hipped roof, you’ll have to square up the triangular sides with some geometry, and you’ll have to build up a waste of material based on how cut the roof planes are.

For a gable, mansard, or shed type of roof, you will need to incorporate a 10% to 12% waste factor for shingles. For a hip roof, you’ll need to do a bit of human calculation based on the roof and how steep the slopes are. I suggest that you use 15-18% as a waste ratio above your base measurements. All this taking into account that you are not afraid of heights and you can climb the slopes of the roofs with a lot of confidence in yourself.

Let’s see how to measure your ceiling from the ground. You will need to decide the slope or slope of the roof so that you can get the right conversions. To do this correctly you will need to climb a ladder high enough that you use a one (1) foot level to find each slope or roof slope.

Slope = Rise (inches) divided by run in feet. Follow this example:

1. Determine the rise in inches… The level will help you decide the rise. If the level is 1 foot and the bubble is level on the ceiling plane you can use your tape measure to line it up with the bottom side of the level and when you get to your inch mark and let’s say it’s at the 7 inch mark on your tape measure is then at a 7:12 roof slope and that will work up to 24 inches of which would be a vertical wall.

2. Measure your foundation and draw the roof as best you can to represent what is visible to you and then add your overhangs to your basic foundation dimensions. Now calculate the foundation and any add-ons, such as a carport with a roof over it, in total square feet.

These are the conversion factors and roof pitch as follows:


2/12 1.0138

3/12 1.0308

4/12 1.0541

5/12 1.0833

6/12 1.1180

7/12 1.1577

8/12 1.2019

9/12 1.2500

10/12 1.3017

11/12 1.3566

12/12 1.4142

12/13 1.4743

12/14 1.5366

12/15 1.6008

12/16 1.6667

These are numbers that I use when necessary. I got them from the Asphalt Roofing Manufacturers Associations Residential Asphalt Roofing Manual published in the early 1990s.

It is possible to add the factorization of the scrap rates, beyond the real-tone conversions. NOTE: Different shingle manufacturers have different conversion factors and these are only a general guide for obtaining the correct roofing materials. 100 square feet equals 1 square of roof and packages will have the coverage indicated on the package. Standard Strip 3 tabs will generally read 33.3 square feet. I feel this will help you do the job of measuring your roof.

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