How To Frame And Build 30 x 60 Foot Garage With Gable Roof Trusses - Construction Education
In this video, Greg is building a 30-foot-wide and 60-foot-long building with a double gable roof. The roof has a 10/12 pitch at the top and a 4/12 pitch at the bottom. Greg will be using a larger door than in previous videos, one that is 13 feet wide and 10 feet tall.
Steps involved in framing a double gable roof:
Install the beams with posts. The beams should be about 5 feet away from the outside wall.
Install the lower rafters, upper rafters, lookouts, and fascia board.
Connect the ridge to the fascia board.
Install blocking between the lower and upper rafters. The blocking will be shaped to match the slope of the roof.
Lap the lower rafter over the upper rafter for a stronger connection.
Install rafter ties, collar ties, and support braces. Rafter ties will connect the rafters on both sides to prevent them from spreading apart. Collar ties will prevent the top of the roof from spreading apart.
Install sheathing. The top section of the sheathing will nail into the blocks and roof rafters.
Pros and Cons of Engineered Roof Trusses vs. Roof Rafters for a 30-Foot Building Span
Engineered Roof Trusses
Pros
Cost-effective: Typically less expensive than rafters due to prefabrication and reduced labor costs.
Stronger and longer spans: Can span greater distances without additional support, allowing for open floor plans.
Faster installation: Pre-assembled and delivered to the site, reducing construction time.
Consistent quality: Manufactured in a controlled environment, ensuring accuracy and minimizing errors.
Engineered for specific loads: Designed to meet local building codes and withstand specific snow and wind loads.
Cons
Less design flexibility: Limited attic space and challenging to modify or add features later.
Requires professional installation: Typically requires a crane or specialized equipment for installation.
Shipping costs: Delivery costs can add to the overall price, especially for remote locations.
Limited aesthetic options: Less visually appealing compared to exposed rafters.
Roof Rafters
Pros
Design flexibility: Offers more attic space and potential for future renovations or additions.
On-site customization: Can be adjusted and customized on-site to fit unique roof designs or features.
Traditional aesthetic: Provides a classic exposed beam look for interior spaces.
DIY friendly: Can be installed by experienced DIYers, potentially saving on labor costs.
Cons
Higher cost: Materials and labor costs can be higher compared to trusses.
Longer installation time: On-site construction takes longer than installing pre-assembled trusses.
Potential for errors: Requires skilled carpentry and precise measurements to ensure structural integrity.
Limited span: May require additional support for longer spans, increasing complexity and cost.
Conclusion
For a 30-foot building span, engineered roof trusses offer several advantages in terms of cost, strength, and installation speed. However, if you prioritize design flexibility, attic space, or a traditional aesthetic, roof rafters may be a better option.
Ultimately, the best choice depends on your specific project requirements, budget, and aesthetic preferences. Consider consulting with a professional builder or engineer to evaluate the best solution for your building.
