Craft Quantities
Plan & Takeoffs

Materials & Quantities

Roof Paver Pedestal Grid Calculator

Calculate the number of adjustable pedestals needed for a pedestal-supported roof paver deck system.

  • Answers as you type
  • Every formula cited
  • Calculated in your browser
SettingsSettings for this calculationUS
Market
Imperial · sales tax
The length of the paver deck area.

Measure the full length of the rooftop area to receive the pedestal-supported paver deck.

The width of the paver deck area.

Measure the full width of the rooftop area to receive the pedestal-supported paver deck.

The spacing between pedestal grid lines, set by the paver system manufacturer.

Pedestal spacing depends on the specific paver system, paver size, and design loads — always confirm the exact grid spacing against the manufacturer's layout requirements.

Pedestals needed

437 pedestals

High confidence

A pedestal paver system on a roof is designed for wind uplift first and for foot traffic second. The pedestal count follows the grid; whether the assembly stays on the roof follows the paver's weight and the corner or edge zone it sits in.

Pedestals along length
23
Pedestals along width
19
Cut paver down the deck
0 ft
Cut paver across the deck
0.5 ft
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • Pedestal count follows a grid layout: count along each dimension = ceil(dimension ÷ grid spacing) + 1; total pedestals = the product of both dimension counts, matching the paver system's manufacturer-specified support grid spacing

Inputs used

Deck Length
33 ft
Deck Width
26 ft
Pedestal Grid Spacing (Manufacturer-Specified)
1.5 ft

Intermediate steps

Pedestals along length
23
Pedestals along width
19
Cut paver down the deck
0 ft
Cut paver across the deck
0.5 ft
Final result437 pedestals

Confidence note: A pedestal paver system on a roof is designed for wind uplift first and for foot traffic second. The pedestal count follows the grid; whether the assembly stays on the roof follows the paver's weight and the corner or edge zone it sits in.

What this calculation does not cover

  • Wind uplift is not checked here. Corner and perimeter zones on a roof see substantially higher uplift than the field, and paver weight or mechanical restraint must be assessed for each zone.
  • Excludes the slope-compensating or height-adjustable heads needed to bring a level walking surface off a falled roof, which are a different and more expensive component.
  • Does not check the point load on the membrane and insulation beneath. A pedestal concentrates load onto a small area, and the insulation's compressive strength governs.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

33 ft10.06 m26 ft7.92 m858 sq ft79.71 m²10 ft2 m

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-02 · in the site-wide review of 2026-09-06 · v1.0.1

Regulatory standards & verification citations1
  1. Pedestal count follows a grid layout: count along each dimension = ceil(dimension ÷ grid spacing) + 1; total pedestals = the product of both dimension counts, matching the paver system's manufacturer-specified support grid spacing
Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Tools and safety for this job

To lay paving. Generic types, no brands, no prices.

Protection this work requires

  • Cutting or grinding concrete, masonry, screed, tile or fibre-cement board releases respirable silica: cut wet or extract at the tool, and wear a P2/N95 respirator at minimum — a nuisance dust mask does not filter it.
  • Saws, grinders and breakers run above 85 dB, where hearing damage accumulates and does not recover: defenders or plugs for every cut, not just the long ones.
  • Breakers and grinders cause permanent nerve damage: limit continuous trigger time, keep hands warm, and stop if fingers tingle or blanch.
  • Boards, blocks and bagged material cause most lasting back injuries on small sites: two people or a lifter for full sheets, and never a bag on one shoulder up a ladder.
Show the 8 tools this job needs

Essential

  • Plate compactor

  • Rubber mallet

  • Shovel and spade

  • Spirit level

  • String line and pins

  • Wheelbarrow

Recommended

  • Block splitter

Optional

  • Angle grinder

Also needed as materials: cutting and diamond discs.

what each landscaping tool is for, and the spec that decides which to buy where one does.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

The data behind it: Production rates by operation

How to calculate roof paver pedestal grid in 4 steps

  1. Deck LengthThe length of the paver deck area.
  2. Deck WidthThe width of the paver deck area.
  3. Pedestal Grid Spacing (Manufacturer-Specified)The spacing between pedestal grid lines, set by the paver system manufacturer.
  4. Pedestals neededThe tool computes the pedestals needed from those figures and shows the formula, its sources, and a confidence rating alongside it.

Pedestals needed by deck length

Page defaults, not your figures above.

Deck LengthPedestals needed (pedestals)
20 ft238
30 ft340
40 ft442
50 ft544
60 ft646

Frequently asked questions

What holds the pavers down in wind?
Mainly their own weight, and it is not a formality. A roof's corners and perimeter see far higher uplift than the middle, and a paver adequate in the field can be inadequate at a corner. The usual responses are heavier pavers in the high-uplift zones, mechanical clips, or a restraint at the perimeter — and which is required comes from a wind calculation, not from the pedestal layout.
How does a level terrace sit on a roof that falls to drain?
On height-adjustable pedestals, or on slope-compensating heads that tilt to keep the paver level while the pedestal sits on a falling deck. Both are standard components and both cost more than a fixed pedestal. Assuming a fixed height across a roof that necessarily falls is one of the more common errors in pricing a roof terrace.
Will the pedestals damage the membrane?
They can, and it is a real design check. Each pedestal concentrates load onto a small footprint, and it is the compressive strength of the insulation below rather than the membrane itself that usually governs. Slip sheets or bearing pads spread the load, and the insulation specification often has to change under a paved area.
Can water still drain under the pavers?
Yes, and that is the point of the system. Water passes between the open joints, runs across the membrane below and reaches the outlets normally. It also means the membrane below stays wet and largely unseen, which is why the waterproofing under a pedestal terrace deserves more scrutiny — and better access provision — than a roof you can simply walk on.
Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.