How to Estimate Vinyl Siding
Figuring out the right amount of siding is actually very easy.
A few things to know:
1) Vinyl siding comes in 12 foot lengths.
2) All accessories also come in 12 foot lengths.
3) Siding is sold by a “builder square”. Which is 100 square feet.
example: 10 feet by 10 feet.
Let’s say you have a two-level house and it’s 50 feet long. Without measuring, the 50 feet part is easy, but measuring the height is a little bit more involved. You need to know that you have eight foot floor ceilings, right? Let’s do this: you have the floor joist for the first floor, the floor joist for the second floor and each one is about 12 inches x 2 plus your two levels (walls) @ 8 feet (96 inches)
2 floors (joist) = 2 feet
2 walls (levels) = 8 feet for a total height of 18 feet high.
So your house is 50 feet long by 18 feet high. Multiply those two numbers and you get 900 square feet.
Now you’re thinking, “but I have windows and a big sliding door…” And you’re right, but remember, the one thing you want to make sure of is that you have enough and you don’t want to start using little pieces towards the end of the job.
This is how I order. I get the total square footage and see what that comes to. Each box of siding comes with two squares in a box so you’re dealing with even numbers. If we have a total of 900 square feet, then you order ten squares. Which will be 1000 square feet and five box’s. Not 9 1/2. Remember, that 1/2 box is more likely to get damaged on delivery and hanging around until you use it, so its not worth not getting it. Once your done, you can always return full pieces using that long empty box that you now have.
On the other hand, lets say you have a total of 825 square feet that you need. And you have some windows, and a door or two. Then I would order for 800 square feet (four boxes).
J channel. This is the trim that goes around the windows and doors. I like to order two pieces per window and three per door no matter how small or big.
In this example, I only showed you for one wall. Chances are, you will be doing more than just one side of your house. Just use the same vinyl siding formula on the other walls.
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