The Concrete and Masonry Water-proofing computes the number of cans (1 gal) 
of water-proofer needed to cover an area.
INSTRUCTIONS: Choose units and enter the following:
- (W) Width of Area
- (H) Height of Area
- (n) Number of Coats
Cans of Water-proof (nC): The calculator returns the number of cans of water-proof needed. It also returns the square feet covered.
The Math / Science
Masonry waterproofer is used in both interior and exterior applications, and both above ground
and below grade. The DRYLOK shown product guarantees "to stop water up to 10 psi and resists 98 mph hurricane winds." The manufacturer recommends at least 2 coats, and 2 to 3 hours between coats.
A foundation or masonry wall is a measurable surface area. Cans of water-proof (as pictured) specify the number of square feet they will cover. The DRYLOK can lists a range of 75 ft2 to 100 ft2 for one gallon can over masonry. The Masonry Water-proofing calculator computes the surface area based on the width and the height and divides the surface area by the high an low range to give the user an idea of how many cans of water-proofing will be needed for one coat.
The formula for Masonry Waterproofing an area is:
nC = [ (W ⋅ H) / PC ] ⋅ n
where:
- P = cans of water-proofing needed
- W = Width of Area
- H = Height of Area
- n = Number of Coats
- PC = Pail Coverage (75 ft2 to 100ft2)
The Coating Calculator has functions to compute the amounts of coating 
substance applied to a surface to protect, enhance, or provide specific properties. More than just paint, coatings can offer additional functionalities such as corrosion resistance, waterproofing, anti-fouling, thermal insulation, or electrical conductivity.
- Coating for a Foundation Wall: Computes the number of pails (5 gal) needed to coat a foundation wall based on the length and height.
- Concrete and Masonry Water-proofing: Computes the number of cans (1 gal) of concrete and masonry water-proofer needed to cover an area based on the width and height and number of coats.
- Corrugated Metal Panel Paint or Coating Volume: Computes the amount of paint or other coating (e.g., spray insulation) on an area of corrugated panels.
- Driveway Coating: Computes the number of pails (4.75 gal) needed to coat or seal a driveway. It provides a minimum and maximum number of pails and the surface area in square feet, all based on the length and width of the driveway.
- Foundation Coating: Computes the number of pails (5 gal) needed to coat all four walls of a foundation. It provides a minimum and maximum number of pails and the surface area of the foundation below grade in square feet, all based on the length, width and height of foundation below grade.
- Pipe Coating Amount: Computes the amount of coating material for the exterior surface area of a pipe based on the pipe diameter, length and the thickness of the coating.
- Roof Coating: Computes the number of pails (e.g., 5 gal) needed to coat a flat roof.
coating materials 