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Construction Sealant Calculator: How Much Sealant Do I Need?
Photo: ML Harris / Adobe Stock
Photo: ML Harris / Adobe Stock
Highlights
How much sealant you need depends on the size the gap you're filling.
To determine how many ounces of caulk you need, multiply the depth, width, and length of the joint to get the volume in cubic inches, then multiply that number by 0.542.
When calculating, add about 5% for waste, regardless of the sealant you're using.
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Construction sealants such as caulk, silicone, fireblock, and foam are available in a seemingly endless selection of types and colors. Once you’ve chosen one, figuring out how much sealant you need is easy: It’s just a matter of measuring the gap you're trying to fill.
How Much Sealant Do I Need?
Whether you're putting the finishing touches on your new bathroom, using roof sealant to protect your home, or even trying to determine the cost of sealing your concrete, part of understanding how to caulk is knowing how much of it to use.
To determine how much sealant you need, you'll need to know how deep, wide, and long the gap you're filling is. The chart below shows the maximum yield you should get from a typical 10-ounce tube of caulk.
| Joint depth (inches) | Coverage (linear feet) for 1/4-inch joint width | Coverage (linear feet) for 3/8-inch joint width | Coverage (linear feet) for 1/2-inch joint width |
|---|---|---|---|
| 1/8 | 48 | 36 | 24 |
| 3/8 | 16 | 12 | 8 |
| 1/2 | 12 | 9 | 6 |
How to Calculate Sealant Needs
While the sealant you purchase will have coverage estimates on the packaging, it can amount to a guessing game. To accurately determine how much sealant you need, you'll need to do some math.
Carefully measure the average depth and width of the gap you need to fill. Convert the inch fraction to a decimal number.
1/8" = 0.125
1/4" = 0.25
3/8" = 0.375
1/2" = 0.5
Now measure the length of the gap in inches.
Multiply the depth by the width by the length. Your result will be in cubic inches. Now multiply the result by 0.542, which is the amount of cubic inches in an ounce of sealant.
1. Sealant volume (cubic inches) = joint depth (inch fraction) x joint width (inch fraction) x joint length (inches)
2. Sealant volume (ounces) = Sealant volume (cubic inches) x 0.542
When calculating your sealant needs, be sure to add roughly 5% for waste, regardless of the type of sealant you're using.
How to Measure for Sealant
Below are some tips to get the most accurate joint measurements, which will help ensure you purchase the right amount of sealant for the job.
How to Measure Gap Joints
To measure gap joints, use a combination of a tape measure, flexible measuring tape, and a ruler, depending on your project. To determine precise depth, consider using a feeler gauge or micrometer.
How to Measure Corner Joints
Using a sealant in a triangular or corner joint is also common. This is necessary around windows or inside corners where one material meets another. Measure the base and height of what will be a triangular sealant bead. Divide by 1/2 to determine the depth.
Who to Hire to Apply Sealant
Photo: sima / Adobe Stock
Applying sealant is excellent for increasing your DIY skills. However, it takes practice to really nail it.
Many homeowners opt to hire a local handy person when looking for someone to tackle bathroom caulking or other sealant needs.
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