# All About interior paint need for a 3500 square foot house

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## How much exterior paint do i need for a 3500 square foot house

As a civil engineer, I have often been involved in construction projects that require accurate estimations of materials. One common task is determining the amount of exterior paint needed for a house. In this case, I will discuss the amount of paint needed for a 3500 square foot house.

The first step in estimating the quantity of paint required is to calculate the total surface area of the exterior walls. Since the house is 3500 square feet, we know that the footprint of the house is 3500 square feet. However, it is important to note that the exterior walls typically have a height of around 8 to 10 feet.

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Assuming a standard wall height of 8 feet, we can calculate the wall area by multiplying the perimeter of the house by the height. If the house is a square with each side measuring 50 feet, then the perimeter would be 200 feet. Therefore, the total wall area would be 200 feet x 8 feet = 1600 square feet.

However, most houses have windows and doors that are not painted. These areas need to be subtracted from the total wall area. Let us assume that the house has 20 windows, each measuring 4 feet by 3 feet, and 2 doors measuring 6 feet by 3 feet. The total area of the windows would be 20 x (4 feet x 3 feet) = 240 square feet. The total area of the doors would be 2 x (6 feet x 3 feet) = 36 square feet. Subtracting these areas from the total wall area, we get 1600 square feet – 240 square feet – 36 square feet = 1324 square feet of paintable surface.

Next, we need to determine the paint coverage rate, which is the amount of paint needed to cover one square foot of surface area. This rate varies based on the type and brand of paint used. For example, a gallon of paint can typically cover around 350-400 square feet. For the purpose of this estimate, I will use a coverage rate of 400 square feet per gallon.

Therefore, the total amount of paint needed would be 1324 square feet / 400 square feet per gallon = 3.31 gallons of paint.

It is always advisable to purchase a little extra paint to account for any potential wastage or additional touch-ups. In this scenario, I would recommend buying an extra gallon of paint, bringing the total amount needed to 4.31 gallons of paint.