Green Roof Waterproofing Calculator

Root barrier and membrane for vegetated roof systems.

Roof length (ft)

Roof width (ft)

Type (1=extensive, 2=semi, 3=intensive)

Roof drains

Penetrations

Parapet perimeter (ft)

Tab to move between fields

Membrane area (sq ft)

2,003

Root barrier (sq ft)1,620

Drainage layer (sq ft)1,575

Growing medium (cu yd)18.5

Saturated weight (PSF)36.7

Total saturated weight (lbs)55,000

Estimated material cost ($)$16,878

How to Use This Calculator

Enter Roof Length (ft) and Roof Width (ft) — the vegetated roof area to be waterproofed.
Select Green Roof Type (1=extensive/sedum, 2=semi-intensive/perennials, 3=intensive/shrubs) to set growing medium depth.
Input Number of Roof Drains, Penetrations, and Parapet Perimeter (ft) requiring special flashing treatment.
Review Membrane Area (sq ft), Root Barrier (sq ft), and Growing Medium (cu yd) to develop material quantities.
Check Saturated Weight (PSF) and Total Saturated Weight (lbs) to verify the structural system can support the assembly.
Use Estimated Material Cost for budgeting — note that labor and structural upgrades are additional.

Ad Placeholder

Related Calculators

Waterproofing assembly for pedestrian plaza over occupied space.

Membrane system for occupied space below decks.

Sealant volume from joint width, depth, and linear footage.

Test procedure from wall type and ASTM standard.

Ad Placeholder