Common Rafter Layout in Metric - A Complete Introduction скачать в хорошем качестве

Common Rafter Layout in Metric - A Complete Introduction

How to lay out common rafters to build a gable roof using a speed square or carpenters framing square and metric (SI) units. A complete introduction. Includes: 1. Roof framing terminology explanations: 00:55 2. How roof slopes are expressed on metric construction plans: 04:00 Percentages: 04:40 Gradients: 05:50 Tangents: 06:50 Degrees: 08:00 3. Building code considerations: 10:20 4. The Step-Off Method: 11:20 5. Calculating the line length: 16:20 Finding the Secant: 17:50 Calculating the overall line length: 18:50 Calculating the adjusted line length: 23:20 Shows how to do rafter layout using a metric carpenter's framing square with a fence or stair gauges, and a rafter square or speed square. Includes how to interpret roof slopes / pitch given in rise to run, gradients, percentages, tangents and degrees; and how to move back and forth between these different systems. Shows how to calculate a tangent (rise per single unit of run) from any roof slope format. Shows how to calculate a secant (AKA: slope factor, slope gain factor, length of rafter per unit of run) and use the secant to calculate rafter line lengths quickly and accurately. The suggested calculator for the rafter calculations shown is an inexpensive pocket calculator with "X squared" and "Square root of X" keys, which will give the results for the values already on the display to minimize keystrokes and errors. This video will be helpful for people building their own roof projects, people preparing for the carpentry Red Seal exam, and people training to compete in secondary level carpentry Skills competitions. The video has a global perspective to encourage Skills competitors to explore how carpentry is done outside of North America and train for the Carpentry event at the WorldSkills competition. Skills Canada Carpentry competition projects are based on platform framing techniques using standard North American dimensional lumber (2x4's, etc.), SI units, and standard pocket calculators. Secondary level projects have only gable roof framing, no hips or valleys. Tools shown are the Hultafors MRS 18cm Metric Rafter Square, the Swanson Metric Speed Square 25 cm, the Stanley 45-530 600mm Steel Carpenter's Square, and the Shinwa 10370 30cm x 50cm Sashigane framing square. Music is a track titled Adventures, by A Himitsu. Use the terms below in YouTube search to check out how rafters are laid out around the world: Alphawinkel, sarikad sarikate puutöö, spāru galdniecība, 서까래 목공, carpenteria per travi, charpenterie à chevrons, 垂木大工, spær snedkeri, Normalsparren zimmerei, taksnickeri, çatı kirişi eğim marangozluğu, karpintero sa bubong, kattopuusepäntyöt, useremala wa paa, carpintaria de vigas de telhado, siúinéireachta díon, ciesielstwo krokwi dachowych. #carpentry #charpente #rafter