Kotelys
Roofing and waterproofing take-off, on the roof plan.
Slopes, ridges, hips, gutters, flat roof and upstands: everything is measured on the roof plan, each item in its own colour.
Windows 10 and 11. Free during the beta.
| Clay tiles (on plan) | 160.00 m² |
|---|---|
| Ridge and hips | 34.28 ml |
| Gutters | 45.50 ml |
| Two-layer waterproofing | 34.16 m² |
| Waterproofing upstands | 23.40 ml |
| Roof windows | 3 u |
The same drawing, in Kotelys.
The take-off drawn on the drawing, the quantities sorted by type in the Objects panel, each in its colour.
A real drawing exported by Kotelys: Roofing and waterproofing (PDF, 74 KB)
What you measure, and how.
Three tools are enough: length, area and count. Each type keeps its colour, from the drawing to the report.
| Item | In Kotelys | Unit |
|---|---|---|
| Roof slopes (tiles, slates, metal sheeting) | AreaArea on plan × the type's pitch | m² |
| Ridges, hips, valleys, verges | LengthLength | ml |
| Gutters, box gutters | LengthLength along the eaves | ml |
| Flat roof waterproofing | AreaArea, roof plant rooms deducted | m² |
| Waterproofing upstands, parapets | AreaThe perimeter of the area, written in the calculations | ml |
| Roof windows, vents, downpipes | CountOne click per item | u |
| Roof structure: purlins, rafters, trusses | LengthLength or count, on the roof structure drawing | ml · u |
On a roof plan, slopes are drawn in horizontal projection: give the type its pitch (as a percentage or in degrees), Kotelys counts the true area and the take-off calculations write it out (× 1.077 for a 40% pitch).
Further reading: Roof take-off: slope areas, ridges, verges and the pitch factor
Why Kotelys for this package.
The perimeter, without redrawing it
Every area also gives its perimeter in the take-off calculations and in Excel: upstands, verges and parapets follow from it.
One type per material
Tiles, zinc, metal sheeting, two-layer membrane: each has its colour, its total and its line in the report.
Plans, sections and elevations
All the project drawings in one file: the roof plan with the sections and elevations alongside.
Frequently asked questions
Another question? Write to us.
Is Kotelys suited to a roofer or a waterproofing contractor?
Yes: roof slopes corrected for the pitch, ridges, verges, gutters, flat roofs and upstands. The pitch is entered once per type, as a percentage or in degrees, and the calculation is written in the take-off report.
Is the roof pitch taken into account?
Yes: give the type its pitch, as a percentage or in degrees, and the quantity becomes the true size (“42.10 m² × 1.118 (pitch 50%) = 47.07 m²”), written in the take-off calculations. Ridges and eaves stay without pitch; hips and valleys take their own, on their own type.
What about the roof structure?
For the take-off, yes: lengths of purlins, wall plates and rafters, number of trusses, on the roof structure drawing. Kotelys does not design the structure.
Does Kotelys open DWG files?
No: Kotelys works on PDFs and images, scanned drawings included. Print a DWG to PDF at scale from your viewer.
How do I get the quantities into my estimate?
The Excel export gives a summary and the object-by-object detail, as fixed values. The PDF take-off calculations write out every calculation, to attach to your pricing.
How much does Kotelys cost?
The beta is free, by invitation. The announced price is €24.90 excl. VAT per month per computer, with a one-month free trial.
Other trades
Structure and external works
Envelope
Building services
Site preparation
The beta is open, by invitation.
Testers are in France for now. Elsewhere? Leave your details and we will let you know.
Windows 10 and 11, 64-bit. Free during the beta.