Plaza Waterproofing Calculator

Waterproofing assembly for pedestrian plaza over occupied space.

Plaza length (ft)

Plaza width (ft)

Traffic (1=ped, 2=light veh, 3=heavy)

Number of drains

Expansion joints (linear ft)

Finish (1=pavers, 2=topping slab)

Tab to move between fields

Membrane area (sq ft)

7,311

Membrane thickness (mils)120

Slope layer (cu yd)111.1

Drainage composite (sq ft)6,300

Waterproofing cost ($)$90,043.00

Total project cost ($)$169,543.00

Cost per sq ft ($)$28.26

How to Use This Calculator

Enter Plaza Length (ft) and Plaza Width (ft) — the total occupied-space deck area to be waterproofed.
Select Traffic Type (1=pedestrian, 2=light vehicular, 3=heavy vehicular) to determine membrane thickness requirements.
Enter Number of Drains and Expansion Joints (linear ft) requiring waterproof detailing.
Choose Finish Type (1=pavers on pedestals, 2=concrete topping slab) to complete the assembly cost estimate.
Review Membrane Area (sq ft), Membrane Thickness (mils), and Slope Layer (cu yd) for material ordering.
Use Waterproofing Cost and Total Project Cost to validate the budget before design development.

How the result changes with Plaza length (ft)

Plaza length (ft): Length of the plaza deck area.
Plaza width (ft): Width of the plaza deck area.
Traffic (1=ped, 2=light veh, 3=heavy): 1 = Pedestrian only. 2 = Light vehicular (cars). 3 = Heavy vehicular (trucks/fire apparatus).
Number of drains: Plaza drain assemblies. Rule of thumb: 1 per 1,000 sq ft minimum.
Expansion joints (linear ft): Linear feet of expansion/control joints requiring waterproof treatment.
Finish (1=pavers, 2=topping slab): 1 = Pavers on adjustable pedestals. 2 = Concrete topping slab.

Membrane area (sq ft): Total waterproofing membrane including flashings and waste.
Membrane thickness (mils): Recommended membrane dry film thickness based on traffic loading.
Slope layer (cu yd): Lightweight concrete or tapered insulation for drainage slope.
Drainage composite (sq ft): Geocomposite drainage layer area.
Waterproofing cost ($): Membrane, slope layer, protection, drainage, and drains.
Total project cost ($): Complete assembly including finish surface.
Cost per sq ft ($): Total project cost per square foot of plaza.

Identify Input Parameters
4 parameters
Plaza length (ft) = 100, Plaza width (ft) = 60, Traffic (1=ped, 2=light veh, 3=heavy) = 1, Number of drains = 6 = 6 input(s) provided
Calculate Membrane area
Membrane area = totalMembraneArea * 1.12
7311 = 7311
Calculate Membrane thickness
120 = 120
Calculate Slope layer
Slope layer = (plazaArea * (avgSlopeDepthIn / 12)) / 27
111.1 = 111.1