Carpentry
the trade,
explained.
A complete Danish reference work on carpentry and joinery — from measuring and centre spacings to rafters, stairs, floors and concrete. Read the articles. Use the calculators. Ask the assistant.
12
Calculators
28
Articles
∞
Questions
Symmetrical gable roof. Half the span (a) and the rise (b) are the legs; the rafter (c) is the hypotenuse. The angle α is the roof pitch — Pythagoras gives the length.
§ 01 — What you can do here
Measure, calculate, build — or ask.
Otte værktøjer fra opslag til montage — for lærlinge, svende og rådgivere.
§ 02 — Read now
Featured articles
§ 03 — Tools
Work it out.
Enter the span, rise and overhang — and get the rafter length, the roof pitch and the diagonal overhang in seconds. The rafter is the hypotenuse of a right-angled triangle, so Pythagoras gives the answer.
Open calculators→Example · Rafter length & roof pitch
Gable roof · span 8.0 m
§ 04 — Trade in Action
How it looks craftsmanship.
Tre klassiske arbejdsgange fra faget — tegnet som blueprint: spær-rejsning, lægtelægning og dampspærre i tagkonstruktionen.
Rafter raising with support
The carpenter raises the rafter frame and attaches it to the ridge with angle brackets and nails. A perforated band anchors against wind load, the rafter projects over the masonry edge as an overhang and a plumb line ensures the rafter stands upright against the roof plane.
Lægtelægning på tagspær
The carpenter lays the battens perpendicular over the rafters with equal center-to-center spacing, nails them at each intersection and measures along the rafter with a tape — the top batten is checked with a level.
Vapour barrier outermost → insulation → pipe
The carpenter unfolds the vapor barrier film behind the insulation and seals the joint: the strips overlap and the overlap is taped so the interior lining closes the structure air-tight. The overlap dimension is indicative — always follow the manufacturer's instructions.
§ 05 — Next step
One question
in Danish.
The AI assistant can calculate geometry, explain work procedures, compare materials and help with real-world cases from the site. Write to it as you would to a colleague.
Ask a questionTip: Rafter length & roof pitch — How long is the rafter, and what pitch does the roof get from the span and rise?
Safety
Kom hjem i samme stand
Tømreren bygger det andre går på. Du står på spær, lægter og stilladsdæk, mens huset endnu ikke har hverken gulv eller rækværk — og du bruger dagen igennem maskiner der skærer, skyder og støver. Faldet fra taget er det der slår tømrere ihjel, og træstøvet er det der langsomt tager lungerne. Begge dele afgøres af det du sætter op, før du går op.
42 moduler · 385 min · 5 farer der kan dræbe
§ — Where can you read about Carpenter?
Find a school nær dig.
Tømrer (træfagenes byggeuddannelse) is offered at 25 steder in the country. The list is informational — always check the latest and complete offering on the Education Guide's vocational education map.
Hovedstaden
03- NEXT Uddannelse København — København / Glostrup
- U/NORD — Hillerød
- Campus Bornholm — Rønne
Sjælland
05- Roskilde Tekniske Skole — Roskilde
- ZBC — Slagelse
- EUC Sjælland — Næstved
- EUC Nordvestsjælland (NEG) — Holbæk
- CELF — Nykøbing Falster
Syddanmark
04- Syddansk Erhvervsskole (SDE) — Odense
- HANSENBERG — Kolding
- EUC Syd — Sønderborg
- Rybners — Esbjerg
Midtjylland
09- AARHUS TECH — Aarhus
- Tradium — Randers
- Mercantec — Viborg
- Learnmark Horsens — Horsens
- Herningsholm Erhvervsskole — Herning
- College360 — Silkeborg
- Skive College — Skive
- VID Erhvervsuddannelser (Viden Djurs) — Grenaa
- Den Jyske Håndværkerskole — Hadsten
Nordjylland
04- TECHCOLLEGE — Aalborg
- EUC Nord — Hjørring
- EUC Nordvest — Thisted
- HEG — Aars